Patent Application
20070279291
These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings, in which:
The present invention discloses a broadband antenna and an assembly combination thereof. Referring to
The first radiation element 11 and second radiation element 12 are preferred to be disposed on the substrate 13. In a preferred embodiment, the distance D1 between the first radiation element 11 and the second radiation element 12 is smaller than or substantially equal to 5 mm.
The reflector 14 and the substrate 13 are secured with each other. For example, a soldering part S can be used to connect and fix the substrate 13 with the reflector 14. It is preferably that distance D2 between the first radiation element 11 and the soldering part S is larger than or substantially equal to 0.3 mm. In this embodiment, the substrate 13 is arranged perpendicular to the reflector 14, while in other embodiment, the substrate 13 and the reflector 14 may, for example, lie on the same plane, as shown in
The reflector 14 can be a metal plate or a metal layer coated on the substrate 13. As skilled in the present art will be appreciated, there is no limitation on shape or material for the reflector 14 shown in Figs.
It is preferable that the first radiation element 11 and the second radiation element 12 respectively include a first feeding point F1 and a second feeding point F2. The first feeding point F1 is located at the midpoint of a upper base 111 of the first trapezoid portion 11a on the first radiation element 11 while the second feeding point F2 is at the midpoint of the second radiation element 12.
The first radiation element 11 having a feeding part 110 that projects a bit beyond the upper base 111 of the first trapezoid portion 11a. It is preferable that the first feeding point F1 is located at the feeding part 110.
In this embodiment, an angle formed by an intersection of two legs 113 on the first trapezoid portion 11a of the first radiation element 11 substantially ranges from 50 to 80 degrees. In other words, the angle θ1, in
It is preferable that, in the first trapezoid portion 11a, the absolute vales of the slopes of the two legs113 are the same and larger than or substantially equal to that of the two legs 114 of the second trapezoid portion 11b. For example, the slope is larger than or substantially equal to 0 to 20 degrees. That means the angle θ2 is larger than the angle θ1 substantially about 0 to 20 degrees.
One of the key points of the present invention is in the shape of the first radiation element 11. That is, it is about the slope of the two legs 113 of the first trapezoid portion 11a and the slope of the two legs 114 of the first trapezoid portion 11b. Although in the embodiment mentioned above and below, the trapezoid shape is taken as an example, there is no limitation on that shape. For example, the upper base 111 of the first trapezoid portion 11a and the lower base 112 of the second trapezoid portion 11b may be parallel with each other or not. Moreover, the upper base 111 and/or the lower base 112 may not be a linear line.
The length L1 of the second radiation element 12 is larger than or substantially equal to ¼ wavelength at the lower operating frequency such as the center frequency at the low frequency band. The width W1 of the second radiation element 12 is smaller than or substantially equal to 1/16 wavelength of the center frequency at low frequency band.
The substrate 13 can be a non-conducting substrate or a multilayer circuit board. Once the substrate is a non-conducting substrate, the broadband antenna 1 further includes a coaxial cable 15 that electrically connects with the first radiation element 11 and the second radiation element 12 for feeding current. For example, the first feeding point F1 can be a positive electrode while the second feeding point F2 is a negative electrode or vice versa so as to make the first radiation element 11 and the second radiation element 12 radiate energy through current excitation.
If the substrate 13 is a multilayer circuit board, there is no need to use the coaxial cable 15 for feeding current. By means of circuit design in the multilayer, the first radiation element 11 and the second radiation element 12 are electrically connected with each other. For example, the first radiation element 11 and the second radiation element 12 can be located on different layers of the circuit board respectively. Thus the alternating current is fed into the first radiation element 11 and the second radiation element 12 for radiating energy.
In this embodiment, the total length of the first part 221 and the second part 222, L1a plus L1b, is about ¼ wavelength of the center frequency at low frequency band, and the length L1b of the second part 222 is about ¼ wavelength of the center frequency at high frequency band. Thus the size of the second radiation element 22 is minimized so that the volume of the broadband antenna 2 can be reduced notably.
Referring to
The first radiation element 31 comprises a feeding part 310 that projects a bit over beyond the upper base 315. The lower base 316 includes an opening 312 that connects with the hollow area 313.
It is preferable that length L4c of the upper base 315 is about ¼ of the wavelength at high frequency band. The lenth L4b of two legs 311 of the first radiation element 31 ranges substantially from 1/16 to ⅛ length L4 of the lower base 316. And the length L4a of the opening 312 is about from 1/16 to ⅛ length L4 of the lower base 316.
Referring to
Refer to
The first antenna 50 and/or the second antenna 50′ respectively includes a first radiation element 51, 51′ and a substrate 53, 53′. The substrate 53 of the first antenna 50 and the substrate 53′ of the second antenna 50′ intersect with each other at an angle such as 90 degrees. The radiation plate 56 is perpendicular to the substrate 53 of the first antenna 50 and the substrate 53′ of the second antenna 50′. Moreover, the radiation plate 56 includes a third radiation element 57 and a fourth radiation element 58 that are disposed at a first side 56a and a second side 56b of the radiation plate 56 respectively. By current passing through the first radiation element 51 of the first antenna 50, the first radiation element 51′ of the second antenna 50′, and the third radiation element 57 as well as the fourth radiation element 58 of the radiation plate 56, radiation energy is excited and then reflected by the reflector 54.
Furthermore, the broadband antenna assembly combination 5 further includes a cable duct 59 that is disposed on an intersection of the substrate 53 of the first antenna 50 and the substrate 53′ of the second antenna 50′ and is extending to the radiation plate 56 for feeding current.
By a first soldering part S and a second soldering part S1, the reflector 54 is fixed with the substrate 53 of the first antenna 50 and the substrate 53′ of the second antenna 50′ by soldering respectively.
Referring to
Referring to
Referring to
In accordance with above embodiments, it should be noted that by adjusting width, length, angle and distance of the radiation element such as parameter W1, L1, L1a, L1b, L4, L4a, L4b, L4c, D1, D2, θ, θ1, θ2 mentioned above, a better impedance match can be achieved. Moreover, the radiation pattern can be controlled in accordance with different shapes of the radiation elements.
Furthermore, the positions of the elements mentioned above can be varied, as skilled persons in this art will be appreciated. For example, as the second radiation element 22 shown in
Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 095209640 | Jun 2006 | TW | national |
