Patent Application
20210313698
The present technology relates to, for example, an antenna applicable to a transmission or reception antenna of a wireless local area network (LAN) and an electronic device provided with the antenna.
An antenna disclosed in Patent Document 1 has been proposed for the purpose of providing a small and thin antenna and a small communication device using this antenna. This antenna is provided with a dielectric layer, a metal layer provided on one surface of the dielectric layer, and a radiation element layer provided on the other surface thereof. Furthermore, the radiation element layer includes a slit portion in the central portion thereof and a contactless feed element above the slit portion.
Furthermore, Patent Document 2 discloses a configuration in which a parasitic element coupled to a slot-type bowtie antenna as a base by a magnetic flow is utilized. That is, a configuration is disclosed in which the slot-type bowtie antenna is formed, and the parasitic element having a strip shape or similar shape galvanically isolated from a metal plate and coupled to the same in a high-frequency manner by a magnetic flow is arranged substantially parallel to a Y-axis.
The antenna disclosed in Patent Document 1 may be made thinner and smaller, and has an excellent effect that this may be used both in a free space and on a conductor, and may be attached around metal parts of home appliances, automobiles and the like. As an application of the antenna, in a case of assuming an antenna for a wireless LAN, this desirably supports two bands: a 2.4 GHz band and a 5 GHz band. In Patent Document 1, the radiation frequency of the antenna is determined by the shape and length of the radiation element 13. Regarding this radiation frequency, it is proposed to expand the resonance frequency by making a rectangular shape a polygonal shape as illustrated as the radiation element layer 113 in FIG. 7, the radiation element layer 213 in FIG. 8, and the radiation element layer 413 in FIG. 12 of Patent Document 1. However, regarding multi-resonance due to deformation of the radiation element layer, there is a problem that, in a case where two or more frequencies are wanted to be realized simultaneously in adjustment to allow a resonance frequency to resonate at a desired frequency, adjustment of one frequency affects the resonance of the other frequency. Furthermore, there is a problem that it is difficult to obtain a desired band. Moreover, since the shape of the radiation element is made the polygonal shape in order to promote multi-resonance, there is a problem that a radiation area is reduced and radiation intensity is deteriorated.
The antenna disclosed in Patent Document 2 is provided with the parasitic element coupled by the magnetic field, but there has been a problem that the position specification of the parasitic element relative to the slot-type bowtie antenna is strict and the specification of the positional relationship between the parasitic element and the feed element is strict.
Therefore, an object of the present technology is to provide an antenna supporting wider frequencies and wider band and an electronic device provided with the antenna.
The present technology is an antenna including a dielectric layer, a metal layer provided on one surface of the dielectric layer, a radiation element layer provided on the other surface of the dielectric layer, the radiation element layer including a slit portion in a central portion, a radiation system of which is magnetic field current radiation by electric field induction, a contactless feed element arranged above the slit portion, and a parasitic radiation element, a radiation system of which is electric field current radiation by magnetic field induction. Furthermore, the present technology is an electronic device provided with such antenna.
According to at least one embodiment, the present technology may provide an antenna supporting wider frequencies and a wider band. Note that, the effects herein described are not necessarily limited and may be any of the effects described in the present technology or other effects.
An embodiment and the like of the present technology are hereinafter described with reference to the drawings. Note that the embodiment and the like hereinafter described are preferred specific examples of the present technology, and the contents of the present technology are not limited to the embodiment and the like.
One embodiment of the present technology is described with reference to
A radiation element (plate-shaped dipole antenna) 113 is arranged on an upper surface of the dielectric layer 112. The radiation element 113 includes radiation element units 113a and 113b. The radiation element 113 includes a slit portion S having a width SO in the central portion of metal having the same size as the metal layer 111.
Moreover, a dielectric layer 114 is arranged on an upper surface of the radiation element 113, and a contactless feed element 115 (dipole antenna) is arranged on an upper surface of the dielectric layer 114. The contactless feed element 115 includes contactless feed element units 115a and 115b. The dielectric 114 has the same size as the metal layer 111, and has a thickness t2 and a relative permittivity E2. The contactless feed element 115 is the dipole antenna having a length b and a gap a arranged orthogonally to the slit portion S.
A dielectric layer 116 as an isolation layer is arranged on an upper surface of the contactless feed element 115, and a parasitic radiation element 117 is arranged on the dielectric layer 116. The dielectric 116 has the same size as the metal layer 111, and has a thickness t3 and a relative permittivity E3. The parasitic radiation element 117 is an antenna having a length L2. A wireless module may be arranged on the dielectric layer 116. Note that, although the metal layer 111, the dielectric layer 112, the dielectric layer 114, and the dielectric layer 116 have the same shape, they do not necessarily have the same shape. Furthermore, the dielectric layer may be an air layer.
Power is fed from an exposed surface of the metal layer 111 via through holes 118a and 118b connected to the contactless feed element units 115a and 115b, respectively. That is, power is fed to the antenna between tip ends of the through holes 118a and 118b. The exposed surface of the metal layer 111 is a surface located on a side opposite to a radiation direction of the antenna.
The antenna according to one embodiment of the present technology described above has substantially similar performances in a case where this is arranged in a free space and in a case where this is arranged on a conductor plate. Therefore, this may be attached to electronic devices such as a communication device, a television, an audio playback device, a game device, and a mobile device, and around metal parts of an automobile and the like.
The operation and action of one embodiment of the present technology are described with reference to
In
In one embodiment of the present technology, a new radiation element may be provided by newly adding the parasitic radiation element 117 without reducing the radiation element bodies in the configuration of Patent Document 1. Moreover, electromagnetic field induction is performed by different radiation systems; a radiation system of the radiation element 113 is magnetic field current radiation by electric field induction, and a radiation system of the parasitic radiation element 117 is electric field current radiation by magnetic field induction. Furthermore, the radiation element 113 and the parasitic radiation element 117 are provided on different surfaces of the dielectric layer 116. As a result, there is an advantage that even in a case where one of the lengths L1 and L2 that determine resonance frequencies is changed, the resonance frequency of the other is not easily affected. Therefore, it becomes easy to adjust a value of the frequency by each radiation element.
In a case where the common wireless device 36 transmits at another frequency, an air propagation radio wave 40 radiated from an antenna 38 supporting the same is received by an antenna radiation pattern 35 (for example, the radiation pattern 121 illustrated in
A variation of one embodiment of the present technology is described with reference to
Although one embodiment of the present technology is heretofore described specifically, the present technology is not limited to the above-described one embodiment, and various modifications based on the technical idea of the present technology may be made. Furthermore, the configuration, method, step, shape, material, numerical value and the like described in the above-described embodiment are illustrative only, and the configuration, method, step, shape, material, numerical value and the like different from those may also be used as necessary.
Note that, the present technology may also have the following configuration.
(1)
An antenna including:
a dielectric layer;
a metal layer provided on one surface of the dielectric layer;
a radiation element provided on the other surface of the dielectric layer, the radiation element including a slit portion in a central portion, a radiation system of which is magnetic field current radiation by electric field induction;
a contactless feed element arranged above the slit portion; and
a parasitic radiation element, a radiation system of which is electric field current radiation by magnetic field induction.
(2)
The antenna according to (1), in which the parasitic radiation element is arranged above the contactless feed element across a dielectric layer.
(3)
The antenna according to (1) or (2), in which one or a plurality of parasitic radiation elements having different lengths is arranged around the parasitic radiation element.
(4)
The antenna according to any one of (1) to (3), in which a feed point is provided on an exposed surface of the metal layer for the contactless feed element.
(5)
The antenna according to any one of (1) to (4), in which a feed point is provided on a side surface of the contactless feed element.
(6)
An electronic device including: the antenna according to (1).
(7)
The electronic device according to (6), in which, in the antenna, the parasitic radiation element is arranged above the contactless feed element across a dielectric layer.
(8)
The electronic device according to (6) or (7), in which, in the antenna, one or a plurality of parasitic radiation elements having different lengths is arranged around the parasitic radiation element.
(9)
The electronic device according to any one of (6) to (8), in which, in the antenna, a feed point is provided on an exposed surface of the metal layer for the contactless feed element.
(10)
The electronic device according to any one of (6) to (9), in which, in the antenna, a feed point is provided on a side surface of the contactless feed element.
101 Antenna
111 Metal layer
112, 114, 116 Dielectric layer
113 Radiation element
113
a,
113
b Radiation element unit
115 Contactless feed element
115
a,
115
b Contactless feed element unit
117, 122, 123 Parasitic radiation element
118
a,
118
b Through hole
119 Feed point
| Number | Date | Country | Kind |
|---|---|---|---|
| 2018-148585 | Aug 2018 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2019/020907 | 5/27/2019 | WO | 00 |
