Patent Grant
7026999
This application is based on Patent Application No. 2002-355136 filed in Japan on Dec. 6, 2002 and Patent Application No. 2003-323047 filed in Japan on Sep. 16, 2003, the contents of which are incorporated hereinto by reference.
1. Field of the Invention
The present invention relates to a pattern antenna to be used for a wireless communication device. The present invention relates particularly to a pattern antenna for a wireless communication equipment which uses more than two frequencies.
2. Description of the Prior Art
It is conventional to use a wireless communication equipment which deals with more than two frequency bands. Systems used for such a wireless communication equipment include Frequency Division Multiple Access (FDMA) method utilizing Frequency Division Duplex (FDD) method in which separate frequency bandwidths are used for transmission and reception; and Time Division Multiple Access (TDMA) method and Code Division Multiple Access (CDMA) method that utilize the FDD method and Time Division Duplex (TDD) method in which time is separated by transmission and reception.
In wireless communication equipment, and in portable wireless communication devices in particular, in order to miniaturize the devices, it is required to miniaturize an antenna to be put into a casing of the wireless communication equipment. In order to miniaturize the antenna, inverted-F-shaped antennas are widely utilized. However, since the frequency bandwidth of the inverted-F-shaped antennas is several percentages in the bandwidth to center frequency ratio, and additionally, due to miniaturization, the frequency bandwidth of the antennas becomes narrow. As a result, as mentioned above, in wireless communication equipment utilizing systems which use more than two wireless frequency bands, the antennas cannot cover a wide frequency bandwidth which contains more than two necessary wireless frequency bands.
As a conventional technique to solve the above-mentioned problem, Japanese Patent Application Laid-Open No. 2000-68736 proposes a multi-frequency antenna consisting of an inverted-F type antenna, wherein a radiation conductor board which is in parallel with a grounding conductor board and to which electrical energy is fed through a coaxial cable has a plurality of unit radiation conductor boards of different length mounted thereon. As another conventional technique, Japanese Patent Application Laid-Open No. 2002-185238 proposes a built-in antenna device corresponding to dual band constituting of a plurality of planar radiation conductors of different length which are in parallel with a planar ground and to which electrical energy is fed by way of a feeding pin.
However, these conventional methods described in Japanese Patent Application Laid-Open Nos. 2000-68736 and 2002-185238, first of all, require a specific amount of space between the radiation conductor board and the ground surface and thus limit miniaturization and thinning of the antennas. In addition, in an aspect of production, a metal mold is necessary for cutting out of a conductor board. Therefore, whenever it is necessary to change the layout of components surrounding the antenna and/or a casing covering the antenna, it is necessary to change the shape of an antenna element, thus requiring a metal mold to be newly made or changed. Also, in order to support the radiation conductor board, it is necessary to insert a spacer between the ground board and the radiation conductor board or to bond a radiation conductor board to the inside of a non-electroconductive casing. Furthermore, in order to feed electrical energy to the radiation conductor board, a feeding pin is necessary to connect the radiation conductor board to the feeding point in an appropriate manner, and thereby it is a trouble and takes time to assemble these components.
An object of the present invention is to provide a pattern antenna which deals with more than two frequency bands and can be miniaturized.
Another object of the present invention is to provide a pattern antenna which deals with a wide frequency bandwidth including more than two frequency bands and can be miniaturized.
In order to achieve the above objects, according to one aspect of the present invention, a pattern antenna is provided with:
a first antenna pattern functioning as a driven element, that includes an elongate pattern which is approximately in parallel with an edge of circumference of a grounding conductor portion mounted on a circuit board and a feeding pattern which connects a feeding point mounted on the circuit board to the elongate pattern;
a second antenna pattern functioning as a passive element, that is so formed as to be in close proximity to the first antenna pattern and to surround the first antenna pattern and includes an elongate pattern which is approximately in parallel with the edge of circumference of the grounding conductor portion and a grounding pattern which connects the grounding conductor portion to the elongate pattern;
wherein the pattern antenna is mounted on the circuit board.
According to another aspect of the present invention, a pattern antenna is provided with:
a first antenna pattern functioning as a passive element, that includes an elongate pattern which is approximately in parallel with an edge of circumference of a grounding conductor portion mounted on a circuit board and a grounding pattern which connects the grounding conductor portion to the elongate pattern;
a second antenna pattern functioning as a driven element that is formed to be in close proximity to the first antenna pattern and to surround the first antenna pattern and includes an elongate pattern which is approximately in parallel with the edge of circumference of the grounding conductor portion and a feeding pattern which connects a feeding point mounted on the circuit board to the elongate pattern;
wherein the pattern antenna is mounted on the circuit board.
According to another aspect of the present invention, a pattern antenna is provided with:
a first antenna pattern formed as loop-type antenna pattern, comprising an elongate pattern which is approximately in parallel with an edge of circumference of a grounding conductor portion mounted on a circuit board; a feeding pattern which connects a feeding point mounted on the circuit board and the elongate pattern; and a grounding pattern which connects the grounding conductor portion to the elongate pattern;
a second antenna pattern that is an inverted-L-shaped antenna pattern, comprising an elongate pattern which is approximately in parallel with the edge of circumference the grounding conductor portion; and a grounding pattern which connects the grounding conductor portion to the elongate pattern;
wherein the circuit board is provided with a plurality of layers including a surface of the circuit board; and
wherein the first antenna pattern and the second antenna pattern are formed on different layers and the first antenna pattern and the second antenna pattern are so formed as to overlap each other.
As mentioned above, according to the present invention, by using more than two antenna patterns which are in close proximity to each other, a feeding point can be set to be one, so that it is not necessary to change over the antennas according to a usable frequency band. Additionally, since pattern antennas are constituted of only copper foil formed on the printed circuit, they can be miniaturized and thinned and do not require components such as conductor boards, feeding pins and the like that have been required conventionally. As a result, it is not necessary to make a metal mold for manufacturing these components, thus enhancing productivity. In addition, since the pattern antennas themselves are not in solid shape, they do not need components which support conductor boards serving as radiation boards that have been required conventionally. Furthermore, by forming a plurality of antenna patterns to be in close proximity to each other, it is possible to realize frequency pattern antennas, sharing a wide range of frequency.
Moreover, according to the present invention, by constituting of antenna patterns that are different in path length, it is possible to configure the pattern antennas to be equipped with a plurality of usable frequency bandwidths. Furthermore, according to the present invention, it is possible to have the pattern antennas equipped with a wide frequency bandwidth, wherein the bandwidth to center frequency ratio is more than 100% when the voltage standing wave ratio (VSWR) is 2.0 or less (VSWR≦2.0).
Hereinafter, embodiments of the present invention will be described.
<First Embodiment>
A first embodiment of the present invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of an inverted-F-shaped antenna pattern 4 and an inverted-L-shaped antenna pattern 5 that are formed by a metal foil on the surface of a printed circuit board 1 shown in
The inverted-F-shaped antenna pattern 4 formed on the surface of the printed circuit board 1 consists of an elongate pattern 4a that is formed in parallel with the edge of circumference of the ground pattern 2 facing to it; a conductor pattern 4b that is connected at one end to the end of the elongate 4a opposite to the open end 4d thereof and is connected at the other end to a feeding point 3 installed to the edge of circumference of the ground pattern 2; and a conductor pattern 4c that is connected at one end to one point between the open end 4d of the elongate pattern 4a and the conductor pattern 4b and is also connected at the other end to the ground pattern 2.
The inverted-L-shaped antenna pattern 5, which is formed on the surface of the printed circuit board 1 in the same manner as the inverted-F-shaped antenna pattern 4, consists of an elongate pattern 5a that is formed to be in close proximity to the elongate pattern 4a and in parallel with the edge of circumference of the ground pattern 2 facing to it; and a conductor pattern 5b that is in close proximity to the conductor pattern 4b and is connected at one end to the opposite side of an open end 5d of the elongate pattern 5a and is also connected at the other end to the ground pattern 2. As a result, the inverted-L-shaped antenna pattern 5 is so formed as to surround the outside of the inverted-F-shaped antenna pattern 4.
The inverted-F-shaped antenna pattern 4 configured in this way resonates, acting as a driven element to which electrical energy is fed, and the inverted-L-shaped antenna pattern 5 resonates, acting as a passive element excited by the inverted-F-shaped antenna pattern 4 which acts as a driven element. Here, by making an addition of the lengths of the elongate pattern 4a and the conductor pattern 4b of the inverted-F-shaped antenna pattern 4 different from an addition of the lengths of the elongate pattern 5a and the conductor pattern 5b of the inverted-L-shaped antenna pattern, frequencies at which each of the antenna patterns resonates are set to be different.
Here, when frequencies for reception are f1 and f2 and wavelengths corresponding to the frequencies f1 and f2 are λ1 and λ2, then a path length L1 of the inverted-F-shaped antenna pattern 4 which equals to the addition of the length of the elongate pattern 4a and the length of the conductor pattern 4b is set to be 10% to 40% of the wavelength λ1, and a path length L2 of the inverted-L-shaped antenna pattern 5 which equals to the addition of the length of the elongate pattern 5a and that of the conductor pattern 5b is set to be 10% to 40% of the wavelength λ2.
By determining the path lengths L1 and L2 of the inverted-F-shaped antenna pattern 4 and the inverted-L-shaped antenna pattern 5 respectively in this manner, usable frequency bandwidth are so formed as to correspond to each of the path lengths of the inverted-F-shaped antenna pattern 4 and the inverted-L-shaped antenna pattern 5. As a result, since the frequency response of the voltage standing wave ratio (VSWR) of the pattern antenna configured as in
For the above-mentioned wavelengths λ1 and λ2, contraction of the wavelengths due to dielectric constant of the printed circuit board 1 is taken into consideration. In other words, when the wavelength in the air is λair, the wavelength λp on the surface of the printed circuit board 1 is λp=λair/((∈r+1)/2)1/2, and the wavelength λpin inside the printed circuit board 1 is λp=λair/(∈r)1/2. The value ∈r indicates relative dielectric constant of the printed circuit board 1.
Other constructions of this embodiment are shown in
In the pattern antenna shown in
<Second Embodiment>
A second embodiment of the invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of the inverted-L-shaped antenna patterns 5 and 6 formed by metal foils on the surface of the printed circuit board 1 shown in
The inverted-L-shaped antenna pattern 6 formed in this way resonates, acting as a driven element to which electrical energy is fed; and the inverted-L-shaped antenna pattern 5 resonates, acting as a passive element that is exited by the inverted-L-shaped antenna pattern 6 which serves as the driven element. At this time, an addition L1 of each length of the elongate pattern 6a and the conductor pattern 6b of the inverted-L-shaped antenna pattern 6 and an addition L2 of each length of the elongate pattern 5a and the conductor pattern 5b of the inverted-L-shaped antenna pattern 5 can be set in a manner that the frequencies at which each of the antenna patterns 5 and 6 resonates are f1 and f2, with the wavelengths λ1 and λ2 being 10 to 40%.
By determining the path lengths L1 and L2 of the inverted-L-shaped antenna patterns 6 and 5 respectively, usable frequency bandwidths are formed to correspond to each path length of the inverted-L-shaped antenna patterns 6 and 5. As a result, as in the first embodiment of the invention, since the frequency response of the voltage standing wave ratio of the pattern antenna configured as in
Another construction of this embodiment is shown in
<Third Embodiment>
A third embodiment of the present invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of the inverted-L-shaped antenna pattern 5 and a loop-type antenna pattern 7 that are formed by a metal foil on a surface of the printed circuit board 1 shown in
The loop-type antenna pattern 7 is composed of an elongate pattern 7a which is formed to be in close proximity to the elongate pattern 5a and also in parallel with an edge of circumference of the ground pattern 2 facing to it; a conductor pattern 7b which is in close proximity to the conductor pattern 5b and is connected to an edge of the elongate pattern 7a at one end and to the feeding point 3 at the other end; and a conductor pattern 7c which is connected to the other edge of the elongate pattern 7a at one end and to the ground pattern 2 at the other end, thus forming a loop together with the ground pattern 2.
The loop-type antenna pattern 7 formed in this way resonates, acting as a driven element to which electrical energy is fed, and the inverted-L-shaped antenna pattern 5 resonates, acting as a passive element which is excited by the loop-type antenna pattern 7 serving as a driven element. Here, the path lengths of the antenna patterns 5 and 7 are set in a manner that the resonance frequencies of each of the loop-type antenna pattern 7 and the inverted-L-shaped antenna pattern 5 are f1 and f2. As a result, as in the first embodiment, in the frequency response of the voltage standing wave ratio of the pattern antenna configured as shown in
Furthermore, in this embodiment, as shown in
The relation between the values will be described below, by setting the center frequency of usable frequency bandwidth to be f0 and setting the relative dielectric constant of the printed circuit board 1 to be 4.2. Here, the length La of the elongate pattern 5a represents the length from the open end 5d to the center of the conductor pattern 5b; the length Lb of the conductor pattern 5b represents the length between the connection point to the ground pattern 2 and the center of the elongate pattern 5a; the length Ra of the elongate pattern 7a represents the length between the centers of the conductor patterns 7b and 7c; and the lengths Rb and Rc of the conductor patterns 7b and 7c represent the length from each of the feeding point 3 and the connection point to the ground pattern 2 to the center of the elongate pattern 7a respectively. In other words, the lengths La, Ra, Lb, Rb and Rc represent the lengths in the center of each of the elongate patterns 5a and 7a and the conductor patterns 5b, 7b and 7c respectively.
Moreover, the height Lh of the inverted-L-shaped antenna pattern 5 represents the length between the connection point to the ground pattern 2 and the outer edge of the elongate pattern 5a; and the space Wr1 between the inverted-L-shaped antenna pattern 5 and the loop-type antenna pattern 7 represents the length from the inner edge of the inverted-L-shaped antenna pattern 5 to the outer edge of the loop-type antenna pattern 7. Furthermore, the wavelength corresponding to the center frequency f0 in the usable frequency bandwidth is set as λ0.
First, in the inverted-L-shaped antenna pattern 5, an addition La+Lb of the lengths La and Lb of the elongate pattern 5a and the conductor pattern 5b is set to be 0.4λ0 to 0.7λ0; and in the loop-type antenna pattern 7, an addition of Ra+Rb+Rc of the lengths Ra, Rb and Rc of the elongate pattern 7a and the conductor patterns 7b and 7c are set to be 0.3λ0 to 0.5 λ0. Then, the conductor width Lw of the inverted-L-shaped antenna pattern 5 is set to be 0.005λ0 to 0.15λ0, and the conductor width Rw of the loop-type antenna pattern 7 is set to be 0.005λ0 to 0.05λ0. Furthermore, the space Wr1 between the inverted-L-shaped antenna pattern 5 and the loop-type antenna pattern 7 is set to be 0.002λ0 to 0.04λ0, and the height Lh of the inverted-L-shaped antenna pattern 5 is set to be 0.1λ0 to 0.3λ0.
The frequency response of the voltage standing wave ratio of the pattern antenna with each of the values set in the above-mentioned way is as shown in
Here, for example, when the center frequency of the usable frequency bandwidth is assumed to be 7 GHz, the length La+Lb of the inverted-L-shaped antenna pattern 5 and the conductor width Lw are assumed to be 17 mm and 2 mm respectively; the length Ra+Rb+Rc of the loop-type antenna pattern 7 and the conductor width Rw are assumed to be 11 mm and 0.7 mm respectively; the space Wr1 between the inverted-L-shaped antenna pattern 5 and the loop-type antenna pattern 7 is assumed to be 0.2 mm; and the height Lh of the inverted-L-shaped antenna pattern 5 is assumed to be 6 mm. By setting these values in this way, in the VSWR response in
Other structures of this embodiment are shown in
<Fourth Embodiment>
A fourth embodiment of the present invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of the inverted-F-shaped antenna pattern 4 and the inverted-L-shaped antenna patterns 5 and 50 that are formed by a metal foil on a surface of a printed circuit board 1 shown in
Here, by making the path lengths of the inverted-L-shaped antenna patterns 5 and 50 approximately the same, the resonance frequencies of the inverted-L-shaped antenna patterns 5 and 50 can be made approximately the same. By having the inverted-L-shaped antenna patterns 5 and 50, which act as passive elements and whose path lengths are approximately the same, formed to be in close proximity to each other in this way, the frequency bandwidth of the inverted-L-shaped antenna patterns 5 and 50 can be widened, compared with when constructed as in
Moreover, this embodiment is so configured as to have another inverted-L-shaped antenna pattern 50, whose path length is approximately the same as that of the inverted-L-shaped antenna pattern 5, added to a pattern antenna shown in
The pattern antenna of this embodiment may not have an inverted-L-shaped pattern antenna added thereto, but may have more than two inverted-L-shaped pattern antennas added thereto. Here, by making the path lengths of the pattern antennas constituting a laminate antenna pattern different from each other, it is possible to construct a frequency antenna, sharing the same number of usable frequencies as the number of the pattern antennas. Furthermore, it may be possible to have an inverted-L-shaped pattern antenna added to any of the pattern antennas in
<Fifth Embodiment>
A fifth embodiment of the invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of the inverted-F-shaped antenna pattern 4 and an inverted-L-shaped antenna pattern 51 that are formed by a metal foil on a surface of the printed circuit board 1 shown in
Then, the stub pattern 51c is so formed as not to overlap the inverted-F-shaped antenna pattern 4 and the ground pattern 2 and so formed as to be in close proximity to the open end 4d of the elongate pattern 4a. Additionally, the elongate pattern 5a, the conductor pattern 5b and the stub pattern 51c of the inverted-L-shaped antenna pattern 51 are so formed as to surround the inverted-L-shaped antenna pattern 4. By providing a stub pattern 51c in this way, impedance can be adjusted for the inverted-L-shaped pattern 51, and in addition, electromagnetic connecting state of the inverted-F-shaped antenna pattern 4 can be adjusted by forming it in close proximity to the inverted-F-shaped antenna pattern 4.
In this embodiment, a stub pattern is so constructed as to be mounted onto an inverted-L-shaped antenna pattern, based on the pattern antenna shown in
<Sixth Embodiment>
A sixth embodiment of the invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of an inverted-F-shaped antenna pattern 4, an inverted-L-shaped antenna pattern 52 and a ground pattern 2a that are formed by a metal foil on a surface of the printed circuit board 1 shown in
The inverted-L-shaped antenna patterns 52 and 53 have a plurality of through holes 52a and 53a made entirely therein. By way of these through holes 52a and 53a, the inverted-L-shaped antenna patterns 52 and 53 are electrically connected. Additionally, the ground patterns 2a and 2b have through holes 21 and 22 made therein, and by way of the through holes 21 and 22 therein, the ground patterns 2a and 2b are electrically connected. In this way, by connecting a plurality of inverted-L-shaped antenna patterns 52 and 53, which act as passive elements, by way of the through holes 52a and 53a; and by overlapping these inverted-L-shaped antenna patterns 52 and 53 each other by way of the printed circuit board 1, the frequency bandwidth of the inverted-L-shaped antenna patterns 52 and 53 is widened, compared with when constructed as in
In this embodiment, another inverted-L-shaped antenna pattern is so constructed on the reverse-side surface as to overlap the inverted-L-shaped antenna pattern on the obverse-side surface the pattern antenna constructed in the same manner as the construction shown in
<Seventh Embodiment>
A seventh embodiment of the invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of the inverted-F-shaped antenna pattern 4 and a ground pattern 2a that are formed by a metal foil on a surface of the printed circuit board 1 shown in
With the construction as described above, the inverted-F-shaped antenna pattern 4 and the inverted-L-shaped antenna pattern 5 are not formed on the same surface but are insulated by the printed circuit board 1. As a result, their locations can be adjusted in the direction in parallel with the surface of the printed circuit board. By constructing the antenna patterns 4 and 5 in this way, it is possible to adjust their positional relation. Therefore, compared with the pattern antenna in
In this embodiment, the antenna patterns having a construction shown in
<Eighth Embodiment>
An eighth embodiment of the invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of four layers of a printed circuit board consisting of printed circuit boards 1a and 1b, and includes the inverted-F-shaped antenna pattern 4 and a ground pattern 2a that are formed by a metal foil on a surface of the printed circuit board 1a shown in
With this configuration as above mentioned, the inverted-F-shaped antenna pattern 4 and the inverted-L-shaped antenna pattern 5 are not formed on the same surface but are insulated by the printed circuit board 1a, so that it is possible to adjust their locations respectively in the direction in parallel with the surface of the printed circuit board. As a result, in the same manner as the pattern antennas shown in
In this embodiment, each of antenna patterns that are formed on the same surface in a configuration as shown in
<Ninth Embodiment>
A ninth embodiment of the invention will be described below with reference to the drawings.
The pattern antenna of this embodiment is composed of a loop-type antenna pattern 7 and a ground pattern 2a that are formed by a metal foil on a surface of the printed circuit board 1 shown in
With this construction as described above, the inverted-L-shaped antenna pattern 5 and the loop-type antenna pattern 7 are not formed on the same surface but isolated by the printed circuit board 1, and as a result, their locations can be adjusted in a direction in parallel with a surface of the printed circuit board. Forming the antenna patterns in this way makes it possible to adjust the positional relation of the antenna patterns, so that compared with the pattern antenna of the third embodiment, impedance of the antenna can be adjusted in a wider range. Here, by setting the length, the conductor width and the height of the inverted-L-shaped antenna pattern 5 and the length and the conductor width of the loop-type antenna pattern 7 in the same manner as the third embodiment and by setting the space between the inverted-L-shaped antenna pattern 5 and the loop-type antenna pattern 7 that is determined by the printed circuit board 1 in the same manner as the space Wr1 between the inverted-L-shaped antenna pattern 5 and the loop-type antenna pattern 7 in the third embodiment, more than 100% bandwidth to center frequency ratio can be achieved.
In this embodiment, the pattern antenna has the inverted-L-shaped antenna pattern and the loop-type antenna pattern formed on the observe-side surface and the reverse-side surface of the printed circuit board respectively. However, same as the eighth embodiment, a pattern antenna may be so constructed as to have an inverted-L-shaped antenna pattern and a loop type antenna pattern overlap each other on different layers of the printed circuit board consisting of a plurality of layers.
<Tenth Embodiment>
A tenth embodiment of the invention will be described below with reference to the drawings.
In this embodiment, as the inverted-F-shaped antenna pattern 41 shown in
By including at least one of the tapered conductor patterns 40b and 40c in this way, the inverted-F-shaped antenna patterns 41 through 43 can change the inner-side path length and the outer-side path length thereof. Therefore, the inverted-F-shaped antenna patterns 41 through 43 in
This embodiment has been described, taking an inverted-F-shaped antenna pattern as an example. In the first through the ninth embodiments, the conductor patterns included the inverted-L-shaped antenna pattern and the loop-type antenna pattern may be tapered in the same manner as the conductor patterns of the inverted-F-shaped antenna patterns shown in
<Eleventh Embodiment>
An eleventh embodiment of the invention will be described below with reference to the drawings.
In this embodiment, as the inverted-F-shaped antenna pattern 44 shown in
As mentioned above, by including at least one of the conductor patterns 47b and 47c whose conductor width is wider than that of the other patterns included an antenna pattern, the inverted-F-shaped antenna patterns 44 through 46 can change the inner-side path length and the outer-side path length thereof. Therefore, the inverted-F-shaped antenna patterns 44 through 46 in
In this embodiment, an inverted-F-shaped antenna pattern has been employed as an example for description. However, in the first through the ninth embodiments, the conductor patterns included the inverted-L-shaped antenna pattern and/or the loop-type antenna pattern may have a wider conductor width than the other patterns in the same manner as the conductor patterns of the inverted-F-shaped antenna pattern in
<Twelfth Embodiment>
A twelfth embodiment of the invention will be described below with reference to the drawings.
In this embodiment, as a loop-type antenna pattern 71 shown in
Accordingly, when the length and the conductor width of the loop-type antenna pattern 71, the length, the conductor width and the height of the inverted-L-shaped antenna pattern 5 and the space between the loop-type antenna pattern 71 and the inverted-L-shaped antenna pattern 5 are set to be the same as the third embodiment, the frequency response of the voltage standing wave ratio (VSWR) of the pattern antenna is to be as shown in
In this embodiment, the loop-type antenna pattern is so formed as to have a stub pattern installed to the conductor pattern which is connected to the feeding point. However, a stub pattern may be installed to an elongate pattern or to a conductor pattern which is connected to the ground pattern. Additionally, as
Although constructed as mentioned above, by setting the length and the conductor width of the loop-type antenna pattern, the length, the conductor width and the height of the inverted-L-shaped antenna pattern and the space between the loop-type antenna pattern and the inverted-L-shaped antenna pattern to be the same as the third embodiment, the frequency response of the voltage standing wave ratio of the pattern antenna can be adjusted to be more favorable than the third embodiment.
<Thirteenth Embodiment>
A thirteenth embodiment of the invention will be described below with reference to the drawings.
In this embodiment, as the inverted-L-shaped antenna pattern 100 shown in
By forming the meandering pattern 105a or the bending pattern 105d on the side of the open end of the elongate pattern 5a in this way, it is possible to make the occupied area of the inverted-L-shaped antenna patterns 100 and 103 smaller than the inverted-L-shaped antenna pattern 5 in
In this embodiment, an inverted-L-shaped antenna pattern has been taken as an example for explanation. However, in the first through the ninth embodiments, the conductor patterns constituting the inverted-F-shaped antenna pattern may have a meandering pattern, a loop-type pattern, a patch-shaped pattern or a bending pattern formed on the side of the open end thereof in the same manner as the elongate pattern of the inverted-L-shaped antenna pattern in
<Fourteenth Embodiment>
A fourteenth embodiment of the invention will be described below with reference to the drawings.
In this embodiment, in the inverted-L-shaped antenna pattern 5 shown in
As the inverted-L-shaped antenna pattern described in this embodiment, the whole or a part of antenna patterns of the inverted-F-shaped antenna patterns, the inverted-L-shaped antenna patterns and the loop-type antenna patterns described in the first through the thirteenth embodiments may have a solder laid thereon. Furthermore, a part of the patterns constituting each antenna pattern may have a solder laid thereon. By soldering in this way, antennas can achieve a cubic content and can widen the width of the frequency bandwidth thereof.
When the pattern antennas of the above first through the fourteenth embodiments are provided, as shown in
Additionally, in case where the ground pattern 2 on the printed circuit board 1 is divided into pieces or narrowed by the portion where the circuit element is mounted, it is possible to enhance grounding effect because the grounding area is increased by the shield board 150. When it is difficult to solder the shield board 150, the ground pattern 2 on the printed circuit board 1 and the shield board 150 may be electrically connected by a metal spring which is soldered near the edge of the circumference of the ground pattern 2 on the printed circuit board 1. Especially, it is effective to connect the ground pattern 2 at an edge of the circumference thereof to the shield board 150 around the edge where an antenna exists.
As shown in
As shown in
Here, the land pattern 155 is soldered to the land pattern 156, and the land pattern 155a is soldered to the land pattern 156a. In addition, the land pattern 155 is located at a position equivalent to the edges of the conductor patterns 4b, 4c and 5b, and the land pattern 155a plays an assistant role. Here, the printed circuit board 1 is thick.
By electrically connecting the land patterns 155 and 155a to the land patterns 156 and 156a in this way, the conductor pattern 4b is electrically connected to the feeding point 3a on the printed circuit board for circuitry 154 by way of the land patterns 155 and 156, and the conductor patterns 4c and 5b are electrically connected to the ground pattern 157 on the printed circuit board for circuitry 154 by way of the land patterns 155 and 156. Moreover, the land pattern 155a is electrically insulated.
Accordingly, with the construction as in
Moreover, when the printed circuit board I which has a pattern antenna formed thereon is to be mounted on the printed circuit board for circuitry 154, as
Moreover, as
By having the electrodes 155x and 155y and the through holes 156x and 156y mounted thereon, the electrodes 155x and 155y on the printed circuit board 1 are soldered after they are inserted into the through holes 156x and 156y in the printed circuit board for circuitry 154. Accordingly, the printed circuit board 1 is fixed to the printed circuit board for circuitry 154, and the conductor pattern 4b is electrically connected to the feeding point 3a on the printed circuit board for circuitry 154 by way of the electrode 155x and the through hole 156x; and the conductor patterns 4c and 5b are electrically connected to the ground pattern 157 of the printed circuit board for circuitry 154 by way of the electrode 155x and the through hole 156x. With the construction as mentioned above, multi-usability is enhanced and the printed circuit board 1 can be made thinner, compared with
The printed circuit board of the above-mentioned embodiments may be composed of glass-fiber-reinforced epoxy resin or ceramics or composed of other dielectric substance materials.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2002-355136 | Dec 2002 | JP | national |
| 2003-323047 | Sep 2003 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 6686886 | Flint et al. | Feb 2004 | B1 |
| 20050110692 | Andersson | May 2005 | A1 |
| Number | Date | Country |
|---|---|---|
| 2002-185238 | Jun 2002 | JP |
| 2000-68736 | Mar 2003 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20040108957 A1 | Jun 2004 | US |
