JP2018007108A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce multireflection of an electromagnetic wave generated between a cover member and an antenna device, and to reduce variation in detection performance of a radar device.SOLUTION: An antenna device 10 comprises: a substrate 11; an antenna element 12 arranged on one surface 11a of the substrate 11, and that transmits/receives an electromagnetic wave; a resonance element 13 arranged at a position different from that of the antenna element 12, on the one surface 11a of the substrate 11, and that receives the electromagnetic wave; and a resistor 15 electrically connected with the resonance element 13 via a transmission line 14, and that consumes power at a resonance frequency of the resonance element 13.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an antenna device.

  Conventionally, a radar device for a vehicle is widely known as a radar device that detects an obstacle by transmitting and receiving electromagnetic waves. A radar device for a vehicle is used for detecting an obstacle while traveling, detecting a passing vehicle from behind, and the like. When such a radar device is attached to a vehicle, it is often installed in a bumper of the vehicle. However, when the radar apparatus is installed in the bumper of the vehicle, the bumper itself reflects electromagnetic waves, so that there is a problem that the detection performance of the radar apparatus deteriorates.

  As a method for suppressing deterioration in detection performance of a radar apparatus caused by a cover member such as a bumper, for example, Patent Document 1 discloses a technique for optimizing the thickness of the cover member.

JP 2003-240838 A

  By the way, the electromagnetic wave reflected by the cover member causes multiple reflections with the antenna device in the radar device. Even if the thickness of the cover member is optimized, the detection performance of the radar device may deteriorate due to multiple reflections between the antenna device and the cover member.

  An object of the present invention is to reduce multiple reflection of electromagnetic waves generated between a cover member and an antenna device, and to suppress deterioration in detection performance of a radar device.

  The antenna substrate of the present invention is disposed on a substrate, an antenna element that is disposed on one surface of the substrate and transmits and receives electromagnetic waves, and the antenna element on the one surface of the substrate is disposed at a position different from that of the substrate. A resonance element that performs reception; and a resistance unit that is electrically connected to the resonance element via a transmission line and that consumes power at a resonance frequency of the resonance element.

  ADVANTAGE OF THE INVENTION According to this invention, the multiple reflection of the electromagnetic wave generate | occur | produced between a cover member and an antenna apparatus can be reduced, and it becomes possible to suppress degradation of the detection performance of a radar apparatus.

The figure which shows typically the positional relationship of a cover member and an antenna device. Graph showing electromagnetic wave intensity change Sectional drawing which shows the antenna apparatus which concerns on 1st Embodiment Graph showing electromagnetic wave intensity change Top view of simulation model Cross section of simulation model Top view of simulation model Cross section of simulation model Simulation result graph Simulation result graph Sectional drawing which shows the antenna device which concerns on 2nd Embodiment Sectional drawing which shows the antenna device which concerns on 3rd Embodiment Sectional drawing which shows the antenna device which concerns on 4th Embodiment Sectional drawing which shows the antenna apparatus which concerns on 5th Embodiment

   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description, a vehicle radar device installed in a vehicle is taken as an example. In each embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted. In addition, all the drawings shown below show the configuration schematically, and in order to facilitate the explanation, the dimensions of each element are exaggerated, and the elements are shown as necessary. It is omitted.

  First, the behavior of electromagnetic waves generated between the antenna device and the cover member will be described with reference to FIG. FIG. 1 is a diagram schematically illustrating the positional relationship between the antenna device and the cover member. In FIG. 1, the antenna device 1 includes a substrate 2, an antenna element 3, and a reflection plate 4. Reference numeral 5 denotes a cover member. The antenna element 3 is disposed on the surface 2 a facing the cover member 5 among both surfaces of the substrate 2. The reflector 4 has a larger area than the antenna element 3 and is disposed inside the substrate 2.

  When the antenna device 1 is a transmitting antenna, electromagnetic waves are radiated from the antenna element 3 toward the cover member 5. The electromagnetic wave radiated from the antenna element 3 travels through the space between the antenna device 1 and the cover member 5 and reaches the cover member 5.

  Among the electromagnetic waves that have reached the cover member 5, a part of the electromagnetic wave passes through the cover member 5, and a part is reflected toward the antenna device 1. The electromagnetic wave reflected by the cover member 5 reaches the reflection plate 4 of the antenna device 1. The electromagnetic wave that has reached the reflecting plate 4 is re-reflected toward the cover member 5.

  Since the electromagnetic wave radiated from the antenna element 3 is radiated continuously, the electromagnetic wave re-reflected by the reflector 4 overlaps with the electromagnetic wave radiated from the antenna element 3. The superimposed electromagnetic wave (hereinafter referred to as “superimposed electromagnetic wave”) is strengthened or weakened by the phase difference between the electromagnetic wave radiated from the antenna element 3 and the electromagnetic wave re-reflected by the reflector 4. For this reason, the electromagnetic wave of substantial antenna radiation is captured so as to become stronger or weaker. Due to this phenomenon, the strength of electromagnetic waves radiated from the antenna device 1 changes.

  Here, consider a case where the electromagnetic wave reflected by the cover member 5 is re-reflected by the reflecting plate 4 and superimposed with the electromagnetic wave radiated from the antenna element 3.

  First, the electromagnetic wave reflected by the cover member 5 is expressed by the following formula (1), assuming that the relative dielectric constant of the cover member 5 is εc, the thickness of the cover member 5 is d, and the dielectric constant in the space outside the cover member 5 is ε0. It is represented by

カバー部材５の内部での電磁波の波長をλｅとすると、式（１）におけるβは、

で表される。
また、カバー部材５の外側の空間での電磁波の波長をλとすると、λｅは、

で表される。

If the wavelength of the electromagnetic wave inside the cover member 5 is λe, β in the equation (1) is

It is represented by
Further, when the wavelength of the electromagnetic wave in the space outside the cover member 5 is λ, λe is

It is represented by

と表すことができる。 Therefore, βd in equation (1) is

It can be expressed as.

ここで、上述のとおり、カバー部材５で反射された電磁波は、反射板４へ到達し、カバー部材５へ向けて再反射される。なお、実際には、再反射は、基板２の面２ａと、反射板４の両方で起こると考えられる。しかしながら、基板２の厚さは、λに対して十分小さい。それゆえ、基板２の面２ａで再反射された電磁波が、重ね合わせ電磁波へ及ぼす影響は、反射板４で再反射された電磁波が、重ね合わせ電磁波へ及ぼす影響に比べて十分小さい。そのため、ここでは反射板４での再反射についてのみ考慮する。 Here, when the phase of the electromagnetic wave radiated from the antenna element 3 is 0, and the distance between the surface 3a of the antenna element 3 facing the cover member 5 and the surface 5a of the cover member 5 facing the antenna device 1 is l, Formula (1) can be represented by the following formula (2).

Here, as described above, the electromagnetic wave reflected by the cover member 5 reaches the reflection plate 4 and is re-reflected toward the cover member 5. Actually, it is considered that re-reflection occurs on both the surface 2 a of the substrate 2 and the reflection plate 4. However, the thickness of the substrate 2 is sufficiently small with respect to λ. Therefore, the influence of the electromagnetic wave re-reflected by the surface 2a of the substrate 2 on the superimposed electromagnetic wave is sufficiently smaller than the influence of the electromagnetic wave re-reflected by the reflector 4 on the superimposed electromagnetic wave. Therefore, only re-reflection at the reflecting plate 4 is considered here.

  The electromagnetic wave that reaches the surface 4a facing the cover member 5 of the reflector 4 has a distance between the surface 2a of the substrate 2 and the surface 4a of the reflector 4 when the phase of the electromagnetic wave radiated from the antenna element 3 is zero. t, where the relative dielectric constant of the substrate 2 is εb, and is expressed by the following formula (3).

また、反射板４は、インピーダンスが十分小さく、ショート端と同じと考えられるため、反射板４での再反射は、逆相全反射となる。

In addition, since the reflection plate 4 has a sufficiently small impedance and is considered to be the same as the short end, re-reflection at the reflection plate 4 is reverse-phase total reflection.

  Further, the electromagnetic wave re-reflected by the reflecting plate 4 travels by t until it overlaps with the electromagnetic wave radiated from the antenna element 3. Therefore, the re-reflected electromagnetic wave overlapping the electromagnetic wave radiated from the antenna element 3 on the surface 3a of the antenna element 3 is expressed by the following formula (4).

アンテナ素子３から放射される電磁波のパワーを１、位相を０とすると、アンテナ素子３から放射される電磁波と、反射板４で再反射された電磁波との重ね合わせ電磁波は、下記の式（５）で表される。

When the power of the electromagnetic wave radiated from the antenna element 3 is 1 and the phase is 0, the superimposed electromagnetic wave of the electromagnetic wave radiated from the antenna element 3 and the electromagnetic wave re-reflected by the reflecting plate 4 is expressed by the following formula (5 ).

ここで、図２に、εｃ＝３、εｂ＝４、ｄ＝３（ｍｍ）、ｔ＝０．２（ｍｍ）として、アンテナ素子３の面３ａとカバー部材５の面５ａとの距離ｌ（ｍｍ）を変化させた場合の、重ね合わせ電磁波の強度を表したグラフを示す。図２において、縦軸は、重ね合わせ電磁波の強度、横軸は、アンテナ素子３の面３ａと、カバー部材５の面５ａとの距離ｌ（ｍｍ）である。

Here, in FIG. 2, assuming that εc = 3, εb = 4, d = 3 (mm), and t = 0.2 (mm), the distance l (the distance l between the surface 3a of the antenna element 3 and the surface 5a of the cover member 5). (mm) is a graph showing the strength of the superimposed electromagnetic wave when changed. In FIG. 2, the vertical axis represents the strength of the superimposed electromagnetic wave, and the horizontal axis represents the distance l (mm) between the surface 3 a of the antenna element 3 and the surface 5 a of the cover member 5.

  As shown in FIG. 2, the strength of the superimposed electromagnetic wave changes depending on the distance l. This is because the phase difference between the electromagnetic wave radiated from the antenna element 3 and the electromagnetic wave re-reflected by the reflector 4 changes according to the distance l.

  Therefore, even when the distance l is optimized when the antenna device 1 is installed in the vehicle, the antenna device is changed due to variations in installation work when the antenna device 1 is installed and vibrations during vehicle travel. The radiation intensity of the electromagnetic wave 1 easily varies.

  Among the components constituting the antenna device, mounting components such as a reflector and GND (ground) are made of a conductor and reflect electromagnetic waves. The surface of the substrate also reflects electromagnetic waves. For this reason, the electromagnetic wave radiated from the antenna element and reflected by the cover member is re-reflected by the reflection plate, the mounted component such as GND, and the surface of the substrate, which may cause such a problem.

  The present invention intends to suppress the occurrence of re-reflection by suppressing the electromagnetic wave radiated from the antenna element and reflected by the cover member from reaching the mounting surface of the reflecting plate, GND or the like, or the surface of the substrate. Is.

(First embodiment)
FIG. 3 is a diagram schematically illustrating a positional relationship between the antenna device and the cover member in the antenna device according to the first embodiment. In the following description, the horizontal direction in FIG. 3 is the X direction, the right direction is the + X direction, and the left direction is the −X direction. Further, the depth direction of the paper surface in FIG. 3 is the Y direction, the back direction of the paper surface is the + Y direction, and the front side of the paper surface is the −Y direction. Also, the vertical direction in FIG. 3 is the Z direction, the upward direction is the + Z direction, and the downward direction is the −Z direction.

  The antenna device 10 includes a substrate 11, an antenna element 12, a resonance element 13, a transmission line 14, a resistor 15, and a reflection plate 16. Reference numeral 17 denotes a cover member.

  The board | substrate 11 consists of an electrically insulating base material, and is a flat member extended in an XY direction. Examples of the electrical insulating base material constituting the substrate 11 include materials having good high frequency characteristics, such as a PPE base material made of polyphenylene ether (PPE) resin, a PTFE base material made of polytetrafluoroethylene (PTFE) resin, and a liquid crystal polymer (LCP). ), Polyimide (PI), or the like.

Further, as the electrically insulating base material constituting the substrate 11, a glass epoxy base material, a thermosetting resin, a composite material including a thermoplastic resin and an inorganic filler can also be used. Examples of the thermosetting resin include an epoxy resin. The inorganic filler to be added may be, for example, _{Al 2 O 3, SiO 2,} MgO, a filler such as AlN.

  The antenna element 12 is a flat plate member made of a conductor such as metal and extending in the XY directions. The antenna element 12 is disposed on the surface 11 a of the substrate 11 that faces the cover member 17. The antenna element 12 has a surface 12 a that faces the cover member 17. The antenna element 12 is controlled by a control device (not shown) and radiates electromagnetic waves toward the cover member 17.

  The resonant element 13 is a flat plate member made of a conductor such as metal and extending in the XY direction. The resonant element 13 is disposed on the surface 11 a of the substrate 11. The resonant element 13 has a surface 13 a that faces the cover member 17. For example, the resonant element 13 has the same shape as the antenna element 12 and has the same gain as the antenna element 12. The resonant element 13 receives electromagnetic waves.

  The transmission line 14 is made of a conductor such as metal and is provided so as to penetrate the substrate 12 in the Z direction. An end of the transmission line 14 in the + Z direction is connected to the resonance element 13, and an end of the −Z direction is connected to a resistor 15 described later. The transmission line 14 electrically connects the resonance element 13 and the resistor 15. The transmission line 14 includes electrical connections such as wiring in the X and Y directions such as microstrip, vias, and through holes.

  The resistor 15 is made of a conductor such as metal, and is disposed on the surface 11b of the substrate 11 opposite to the surface 11a. The resistor 15 is connected to the resonance element 13 via the transmission line 14 and consumes the electric power of the electromagnetic wave received by the resonance element 13 at the resonance frequency of the resonance element 13.

  The reflection plate 16 is made of a conductor such as metal and is provided inside the substrate 11. The reflection plate 16 re-reflects the electromagnetic wave radiated from the radiation element 13 and reflected by the cover member 17. The reflection plate 16 has a surface 16 a that faces the cover member 17.

  Here, the effect when the resonant element 13 is connected to the resistor 15 via the transmission line 14 will be described. In this embodiment, the antenna device is provided with a resonance element that absorbs radio waves separately from the antenna elements that perform transmission and reception, and the influence of re-reflection is reduced by absorbing the reflected wave from the cover member. .

  The superimposed electromagnetic wave obtained by superimposing the electromagnetic wave radiated from the antenna element 12 and the electromagnetic wave re-reflected by the reflecting plate 16 has a reflectance of 1 on the surface 11a of the substrate 11 when the resonant element 13 is not provided. When the reflectance on the surface 11a of the substrate 11 when the resonant element 13 is provided is R, it is expressed by the following formula (6).

図４は、反射率を０．５とした場合の、アンテナ素子１２から放射される電磁波と、反射板１６で再反射される電磁波との重ね合わせ電磁波の強度を示したグラフである。図４において、縦軸は、重ね合わせ電磁波の強度、横軸は、アンテナ素子１２の面１２ａと、カバー部材１７のアンテナ装置１０と対向する面１７ａとの距離ｌ（ｍｍ）である。図４において、実線は、共振素子１３を設けた場合、破線は、共振素子１３を設けない場合の重ね合わせ電磁波の強度をそれぞれ示す。

FIG. 4 is a graph showing the intensity of the superimposed electromagnetic wave of the electromagnetic wave radiated from the antenna element 12 and the electromagnetic wave re-reflected by the reflecting plate 16 when the reflectance is 0.5. In FIG. 4, the vertical axis represents the strength of the superimposed electromagnetic wave, and the horizontal axis represents the distance l (mm) between the surface 12 a of the antenna element 12 and the surface 17 a of the cover member 17 facing the antenna device 10. In FIG. 4, the solid line indicates the intensity of the superimposed electromagnetic wave when the resonance element 13 is provided, and the broken line indicates the intensity of the superimposed electromagnetic wave when the resonance element 13 is not provided.

  As shown in FIG. 4, when the resonant element 13 is provided, the intensity of the superimposed electromagnetic wave changes between about 0.8 and about 1.2. On the other hand, when the resonant element 13 is not provided, the intensity of the superimposed electromagnetic wave changes between about 0.6 and about 1.4. That is, disposing the resonant element 13 on the surface 11 a of the substrate 11 can suppress variations in electromagnetic wave intensity, rather than disposing the resonant element 13 on the surface 11 a of the substrate 11.

  It was verified by simulation analysis that the variation in the intensity of the electromagnetic wave can be suppressed by providing the resonant element.

  5A and 5B are a top view and a cross-sectional view of an antenna device model without a resonant element. In FIG. 5A, the cover member is omitted.

  In the antenna device 20 shown in FIGS. 5A and 5B, the substrate 21 is set to have an X-direction dimension of 24 mm, a Y-direction dimension of 24 mm, a Z-direction dimension of 0.12 mm, and a relative dielectric constant of 3. As shown in FIG. 5A, the antenna element 22 is arranged at the center of the surface in the + Z direction on the substrate 21. As the antenna element 22, a patch antenna is used, and the radiation is set to be maximum at 79 GHz.

  As illustrated in FIG. 5B, the cover member 27 is disposed at a position away from the antenna device 20 by a predetermined distance in the + Z direction. The cover member 27 has an X-direction dimension of 100 mm, a Y-direction dimension of 100 mm, a Z-direction dimension of 3 mm, and a relative dielectric constant of 5.

  6A and 6B are a top view and a cross-sectional view of an antenna device model provided with a resonant element. In FIG. 6A, the cover member is omitted.

  As shown in FIG. 6A, in addition to the configuration of the antenna device 20, the antenna device 30 includes a plurality of resonant elements 33 arranged in the X direction and the Y direction so as to surround the antenna element 32. As shown in FIG. 6B, the cover member 37 is disposed at a position away from the antenna device 30 by a predetermined distance in the + Z direction. The configuration of the cover member 37 is the same as the configuration of the cover member 27.

  7 and 8 show the analysis results. FIG. 7 shows an analysis result when no resonance element is provided, and FIG. 8 shows an analysis result when a resonance element is provided. 7 and 8 show the radiation gain of the antenna device 20 in each direction. 7 and 8, the vertical axis represents gain (dBi), and the horizontal axis represents radiation azimuth (deg.). 7 and 8 also show the results of changing the distance from the substrate 21 to the cover member 27 in increments of 0.25 mm from 20 mm to 21 mm.

  As shown in FIG. 7, when no resonant element is provided, the gain varies with a width of 15 dB from −5 dBi to +10 dBi in the radial direction of 0 °.

  On the other hand, when the resonant element is provided, as shown in FIG. 8, the gain change width is 8 dB from −2 dBi to +6 dBi in the direction of the radiation azimuth as shown in FIG. It can be seen that the change width of is suppressed small.

  As described above, according to the first embodiment, the resonant element 13 is provided at a position different from the antenna element 12 on the surface 11a facing the cover member 17 of the substrate 11, and the resonant element 13 is connected to the transmission line. 14 is connected to the resistor 15 via 14, the multiple reflection of electromagnetic waves generated between the antenna device 10 and the cover member 17 can be reduced, and the variation in the detection performance of the radar device can be reduced.

(Second Embodiment)
FIG. 9 is a diagram schematically illustrating an antenna device according to the second embodiment. The antenna device 40 includes a substrate 41, an antenna element 42, a resonance element 43, first to fourth transmission lines 44A to 44D, a semiconductor IC 45, and a reflector 46. 47 is a cover member and 48 is a solder ball.

  The antenna element 42 includes a first transmission line 44A penetrating the substrate 41 in the Z direction, a second transmission line 44B formed on the surface of the substrate 41 in the −Z direction, and a solder ball 48 to be described later. It is connected to the first circuit 45A.

  The resonant element 43 includes a third transmission line 44C penetrating the substrate 41 in the Z direction, a fourth transmission line 44D formed on the surface of the substrate 41 in the −Z direction, and a solder ball 48 to be described later. It is connected to the second circuit 45B.

  The semiconductor IC 45 includes a first circuit 45 </ b> A that is electrically connected to the antenna element 42 and performs signal processing in the antenna device 40. In addition, the semiconductor IC 45 is electrically independent from the first circuit 45A, does not perform signal processing of the antenna device 40, and has a second circuit 45B that attenuates the frequency signal of the electromagnetic wave radiated from the antenna element 42. ing. The resonant element 43 is connected to the second circuit 45B.

  The resonant element 43 may be connected to an element having a resistance component with respect to the frequency of the electromagnetic wave radiated from the antenna element 42 instead of the second circuit 45B. An example of such an element is a high-frequency amplifier that is not used in the signal processing of the antenna device 40.

  By doing in this way, it becomes possible to attenuate a signal using an existing semiconductor IC without newly providing a resistance part for attenuating the signal.

(Third embodiment)
FIG. 10 is a diagram schematically illustrating an antenna device according to the third embodiment. The antenna device 50 includes a substrate 51, an antenna element 52, a first resonance element 53, a transmission line 54, a second resonance element 55, a reflector 56A, and a GND 56B. 57 is a cover member.

  The substrate 51 is made of a resin having a resistance component. As shown in FIG. 10, the first resonance element 53 is connected to a second resonance element 55 provided inside the substrate 51 via a transmission line 54.

  In the third embodiment, by providing the second resonance element 55 inside the substrate 51, the antenna element 52 radiates due to the resistance component of the resin constituting the substrate 51 while confining the electromagnetic waves inside the substrate 51. The frequency signal of electromagnetic waves can be attenuated.

  In particular, in a millimeter-wave band radar device widely used as a vehicle radar device, the substrate has a multilayer structure, an expensive substrate with a small dielectric loss tangent is used on the antenna surface, and a large dielectric loss tangent for the circuit is inexpensive. A substrate is used. By connecting the second resonant element 55 to a substrate having a large dielectric loss tangent, the signal can be attenuated more efficiently.

(Fourth embodiment)
FIG. 11 is a diagram schematically illustrating an antenna device according to the fourth embodiment. The antenna device 60 includes a substrate 61, an antenna element 62, a resonance element 63, a first transmission line 64, a second transmission line 65, a reflector 66A, and a GND 66B. 67 is a cover member.

  As shown in FIG. 11, the resonant element 63 is connected via a first transmission line 64 to a second transmission line 65 whose tip is open or short-circuited inside the substrate 61. By so doing, as in the third embodiment, the signal can be attenuated while confining the electromagnetic wave inside the substrate 61.

  In the case of the present embodiment, the signal is reflected at the tip of the second transmission line 60, but the length of the second transmission line 60 is sufficiently long or a material having a large dielectric loss tangent is used as the material of the substrate 61. Thus, the reflected signal can be sufficiently attenuated. Examples of the substrate material having a large dielectric loss tangent include glass epoxy and PPE.

(Fifth embodiment)
FIG. 12 is a diagram schematically illustrating an antenna device according to the fifth embodiment. The antenna device 70 includes a substrate 71, an antenna element 72, a first resonance element 73, a transmission line 74, a second resonance element 75A, a radio wave absorber 75B, and a reflection plate 76. Reference numeral 77 denotes a cover member.

  As shown in FIG. 12, the first resonance element 73 is connected to the second resonance element 75 </ b> A provided on the surface in the −Z direction of the substrate 71 via the transmission line 74. The radio wave absorber 75B is provided at a position away from the second resonance element 75A by a predetermined distance in the −Z direction. The signal transmitted from the first resonance element 73 to the second resonance element 75A is emitted as an electromagnetic wave into the space, reaches the opposing radio wave absorber 75B, and is absorbed.

  As the radio wave absorber 75B, for example, carbon particles and ferrite can be used. Alternatively, a dielectric having a thickness of ¼ of the frequency of the electromagnetic wave to be absorbed and a conductor bonded to each other can be used. By doing so, the signal can be attenuated without increasing the size of the antenna device.

  Furthermore, if a plurality of first resonance elements are connected to one second resonance element, the number of second resonance elements can be reduced and the radio wave absorber can be reduced in size.

  The embodiments have been described above. In each embodiment, the same effect can be obtained when a known loop antenna, standing wave antenna, or microstrip antenna is used as the antenna.

  The antenna device according to the present invention is useful for a radar device for a vehicle.

DESCRIPTION OF SYMBOLS 1 Antenna apparatus 2 Board | substrate 2a surface 3 Antenna element 3a surface 4 Reflector 4a surface 5 Cover member 5a surface 10, 20, 30, 40, 50, 60, 70 Antenna apparatus 11, 21, 31, 41, 51, 61, 71 Substrate 11a, 11b surface 12, 22, 32, 42, 52, 62, 72 Antenna element 12a surface 13, 33, 43, 63 Resonant element 13a surface 14, 54, 74 Transmission line 15 Resistance 16, 46, 76 Reflector 17 , 27, 37, 47, 57, 67, 77 Cover members 44A to 44D First to fourth transmission lines 45 Semiconductor IC
45A First circuit 45B Second circuit 48 Solder ball 53 First resonant element 55 Second resonant element 56A, 66A Reflector 56B, 66B GND
64 1st transmission line 65 2nd transmission line 73 1st resonance element 75A 2nd resonance element 75B Radio wave absorber

Claims (8)

A substrate,
An antenna element disposed on one surface of the substrate for transmitting and receiving electromagnetic waves;
A resonant element disposed at a position different from the antenna element on the one surface of the substrate and receiving electromagnetic waves;
A resistance unit that is electrically connected to the resonant element via a transmission line and that consumes power at a resonant frequency of the resonant element;
Antenna device. A processing unit that is electrically connected to the antenna element via a transmission line, is electrically independent from the resistance unit, and further performs signal processing of electromagnetic waves received by the antenna element, and the processing unit And the resistance portion is formed as an integrated circuit,
The antenna device according to claim 1. The processing unit and the resistance unit are amplifiers that perform signal amplification.
The antenna device according to claim 2. The resistance portion is provided on the other surface of the substrate.
The antenna device according to claim 1. The resistance portion is provided inside the substrate.
The antenna device according to claim 1. The transmission line has an open or shorted tip in the substrate,
The resistance portion is the substrate.
The antenna device according to claim 1. The resistance portion is a radio wave absorber provided apart from the other side of the substrate.
The antenna device according to claim 1. The resonant element has the same shape as the antenna.
The antenna device according to claim 1.

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