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JP2021113690A - Radar device and radome - Google Patents

Radar device and radome Download PDF

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Publication number
JP2021113690A
JP2021113690A JP2020005150A JP2020005150A JP2021113690A JP 2021113690 A JP2021113690 A JP 2021113690A JP 2020005150 A JP2020005150 A JP 2020005150A JP 2020005150 A JP2020005150 A JP 2020005150A JP 2021113690 A JP2021113690 A JP 2021113690A
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Japan
Prior art keywords
antenna
radar device
radio wave
radome
specific direction
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JP2020005150A
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Japanese (ja)
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健太 白髭
Kenta Shirahige
健太 白髭
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Denso Corp
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Denso Corp
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Priority to JP2020005150A priority Critical patent/JP2021113690A/en
Priority to PCT/JP2021/000658 priority patent/WO2021145305A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/23—Combinations of reflecting surfaces with refracting or diffracting devices

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

To suppress turbulence of a reception pattern caused by an unnecessary radio wave.SOLUTION: A rader device is provided with: an antenna unit 3; a base part 2; a radome main body 41; and a periodic structure 42. The antenna unit 3 has an antenna pattern 32 that transmits and receives an object radio wave. The antenna unit 3 is mounted to the base part 2. The radome main body 41 is made of a material transmitting the object radio wave, and forms an antenna housing space storing the antenna unit 3 together with the base part 2. The periodic structure 42 is provided integrally with the radome main body 41, and is configured to make an effective dielectric constant in the antenna housing space and in the radome main body 41 periodically vary along a specific direction, and form an electromagnetic band gap structure blocking propagation of the object radio wave in the specific direction. The specific direction is set in a plane parallel with a pattern formation surface 3a of the antenna unit.SELECTED DRAWING: Figure 1

Description

本開示は、レーダ装置及びレドームに関する。 The present disclosure relates to radar devices and radomes.

下記特許文献１には、周辺監視用のレーダ装置において、アンテナの周辺部に、材質又は機械的形状を周期的に変化させた周期構造体を設けることで、受信パタンの乱れの原因となる不要電波を抑制する技術が提案されている。 In Patent Document 1 below, in a radar device for peripheral monitoring, by providing a periodic structure in which the material or mechanical shape is periodically changed in the peripheral portion of the antenna, it is unnecessary to cause disturbance of the reception pattern. Techniques for suppressing radio waves have been proposed.

特開２００７−２３５２８７号公報Japanese Unexamined Patent Publication No. 2007-235287

しかしながら、発明者の詳細な検討の結果、特許文献１に記載の従来技術では以下の課題が見出された。すなわち、従来技術では、周期構造体をレドームに設けた場合、アンテナ正面には周期構造体を配置できないというレイアウト上の制約がある。このため、アンテナが複数存在する場合に、個々のアンテナから見たアンテナの配列方向の周期構造体の構造、ひいては、不要電波の抑制効果が非対称となり、受信パタンの乱れを十分に抑制できないという課題があった。また、前記レイアウト上の制約によって、周期構造体を十分なサイズで配置できない部位では、不要電波の抑制効果が十分に得られないという課題もあった。 However, as a result of detailed examination by the inventor, the following problems have been found in the prior art described in Patent Document 1. That is, in the prior art, when the periodic structure is provided on the radome, there is a layout restriction that the periodic structure cannot be arranged in front of the antenna. Therefore, when there are a plurality of antennas, the structure of the periodic structure in the arrangement direction of the antennas as seen from each antenna, and by extension, the effect of suppressing unnecessary radio waves becomes asymmetric, and the disturbance of the reception pattern cannot be sufficiently suppressed. was there. Further, there is also a problem that the effect of suppressing unnecessary radio waves cannot be sufficiently obtained in a portion where the periodic structure cannot be arranged in a sufficient size due to the limitation on the layout.

本開示の１つの局面は、不要電波の影響による受信パタンの乱れを抑制する技術を提供することにある。 One aspect of the present disclosure is to provide a technique for suppressing disturbance of a reception pattern due to the influence of unnecessary radio waves.

本開示の一態様は、レーダ装置であって、アンテナ部（３）と、基部（２）と、レドーム本体（４１）と、周期構造体（４２）と、を備える。アンテナ部は、予め設定された周波数帯の電波である対象電波を送受信するアンテナパタン（３２）を有する。基部は、アンテナ部が装着される。レドーム本体は、対象電波を透過する材料で形成され、基部と共にアンテナ部を収納するアンテナ収納空間を形成する。周期構造体は、レドーム本体と一体に設けられ、アンテナ収納空間内及びレドーム本体内における実効誘電率を、特定方向に沿って周期的に変化させて、特定方向への対象電波の伝搬を阻止する電磁バンドギャップ構造を形成する。なお、特定方向は、アンテナ部のパタン形成面（３ａ）と平行な面内に設定される。 One aspect of the present disclosure is a radar device, which includes an antenna portion (3), a base portion (2), a radome main body (41), and a periodic structure (42). The antenna unit has an antenna pattern (32) for transmitting and receiving a target radio wave, which is a radio wave in a preset frequency band. An antenna portion is attached to the base portion. The radome body is made of a material that transmits the target radio wave, and together with the base portion, forms an antenna storage space for accommodating the antenna portion. The periodic structure is provided integrally with the radome body, and the effective permittivity in the antenna storage space and the radome body is periodically changed along a specific direction to prevent the propagation of the target radio wave in the specific direction. Form an electromagnetic bandgap structure. The specific direction is set in a plane parallel to the pattern forming plane (3a) of the antenna portion.

本開示の一態様は、レドームであって、レドーム本体（４１）と、周期構造体（４２）と、を備える。レドーム本体は、予め設定された周波数帯の電波である対象電波を透過する材料で形成され、対象電波を送受信するアンテナパタン（３２）を有したアンテナ部（３）が装着される基部（２）と共にアンテナ部を収納するアンテナ収納空間を形成する。周期構造体は、アンテナ収納空間内及びレドーム本体内における実効誘電率を、特定方向に沿って周期的に変化させて、特定方向への対象電波の伝搬を阻止する電磁バンドギャップ構造（以下、ＥＢＧ構造）を形成する。なお、特定方向は、アンテナ部のパタン形成面（３ａ）と平行な面内に設定される。 One aspect of the present disclosure is a radome, comprising a radome body (41) and a periodic structure (42). The radome body is formed of a material that transmits a target radio wave, which is a radio wave in a preset frequency band, and a base portion (2) to which an antenna portion (3) having an antenna pattern (32) for transmitting and receiving the target radio wave is mounted. At the same time, an antenna storage space for accommodating the antenna portion is formed. The periodic structure has an electromagnetic bandgap structure (hereinafter, EBG) that periodically changes the effective permittivity in the antenna storage space and the radome body along a specific direction to prevent the propagation of the target radio wave in the specific direction. Structure) is formed. The specific direction is set in a plane parallel to the pattern forming plane (3a) of the antenna portion.

このような構成によれば、周期構造体が、アンテナ収納空間内及びレドーム本体内での特定方向への電波の伝搬を抑制する。その結果、特定方向へ不要電波が伝搬することによって発生する干渉の影響を抑制でき、更には干渉の影響によってアンテナ部のビームパタンが歪むことを抑制できる。 According to such a configuration, the periodic structure suppresses the propagation of radio waves in a specific direction in the antenna storage space and the radome body. As a result, the influence of interference generated by the propagation of unnecessary radio waves in a specific direction can be suppressed, and further, the distortion of the beam pattern of the antenna portion due to the influence of interference can be suppressed.

周期構造体がレドーム本体と一体に設けられているため、アンテナパタンの正面を含むアンテナ部の全面を覆うように均一にＥＢＧ構造を形成できる。その結果、アンテナ収納空間内及びレドーム本体内のどの地点でも、周期構造体による均一な伝搬抑制効果を得ることができる。 Since the periodic structure is provided integrally with the radome body, the EBG structure can be uniformly formed so as to cover the entire surface of the antenna portion including the front surface of the antenna pattern. As a result, a uniform propagation suppression effect by the periodic structure can be obtained at any point in the antenna storage space and the radome body.

周期構造体がレドーム本体と一体に設けられているため、アンテナ収納空間内に搭載される回路基板上のパタンレイアウトや部品配置が、周期構造体によって制約を受けることがなく、設計の自由度を高めることができる。 Since the periodic structure is provided integrally with the radome body, the pattern layout and component arrangement on the circuit board mounted in the antenna storage space are not restricted by the periodic structure, and the degree of freedom in design is increased. Can be enhanced.

周期構造体がＥＢＧ構造を形成するため、レーダ波の偏波の種類によらず不要電波の伝搬を抑制できる。 Since the periodic structure forms the EBG structure, it is possible to suppress the propagation of unnecessary radio waves regardless of the type of polarization of the radar wave.

レーダ装置の構成を示す断面図である。It is sectional drawing which shows the structure of a radar apparatus. レーダ装置のアンテナ収納空間を上方から見た透視図である。It is a perspective view which looked at the antenna storage space of a radar device from above. 周期構造の有無による通過損失の周波数特性の違いを示すグラフである。It is a graph which shows the difference of the frequency characteristic of the passing loss depending on the presence or absence of a periodic structure. 電界強度分布のシミュレーションに用いたモデル及びシミュレーション結果を示す説明図である。It is explanatory drawing which shows the model used for the simulation of the electric field strength distribution, and the simulation result. 水平方向のビームパタンを示すグラフである。It is a graph which shows the beam pattern in the horizontal direction.

以下、図面を参照しながら、本開示の実施形態を説明する。
［１．構成］
図１及び図２に示すレーダ装置１は、車両に搭載され、ミリ波帯の周波数（以下、対象周波数）を有する電波（以下、レーダ波）を送信し、レーダ波を反射した物標からの反射波を受信することで、車両の周囲に存在する物標を認識する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. Constitution]
The radar device 1 shown in FIGS. 1 and 2 is mounted on a vehicle, transmits a radio wave (hereinafter, radar wave) having a frequency in the millimeter wave band (hereinafter, target frequency), and is transmitted from a target that reflects the radar wave. By receiving the reflected wave, the target existing around the vehicle is recognized.

レーダ装置１は、基部２と、アンテナ部３と、レドーム４とを備える。
アンテナ部３は、回路基板３１と、アンテナパタン３２とを備える。回路基板３１は、第１の面にアンテナパタン３２が形成される。 The radar device 1 includes a base 2, an antenna 3, and a radome 4.
The antenna unit 3 includes a circuit board 31 and an antenna pattern 32. An antenna pattern 32 is formed on the first surface of the circuit board 31.

以下では、図１の上下方向をＸ軸方向、図１の左右方向をＹ軸方向、図１の奥行き方向をＺ軸方向という。つまり、レーダ装置１において、回路基板３１の基板面がＹ−Ｚ平面に沿うように配置され、回路基板３１の法線方向がＸ軸方向となるように配置される。また、レーダ装置１は、Ｙ軸方向が水平方向と一致し、Ｚ軸方向が車高方向と一致するように車両に取り付けられる。 In the following, the vertical direction of FIG. 1 is referred to as the X-axis direction, the horizontal direction of FIG. 1 is referred to as the Y-axis direction, and the depth direction of FIG. 1 is referred to as the Z-axis direction. That is, in the radar device 1, the substrate surface of the circuit board 31 is arranged along the YY plane, and the normal direction of the circuit board 31 is arranged so as to be the X-axis direction. Further, the radar device 1 is attached to the vehicle so that the Y-axis direction coincides with the horizontal direction and the Z-axis direction coincides with the vehicle height direction.

回路基板３１は、誘電体材料で形成されたプリント基板である。
アンテナパタン３２は、Ｙ軸方向に沿って配列され、アレイアンテナを形成する２つの単位アンテナＡ１，Ａ２を備える。単位アンテナＡｉは、Ｚ軸方向に沿って配列された複数のパッチアンテナと、各パッチアンテナに同相給電するための配線パタンとを備える。アンテナパタン３２は、Ｙ軸方向に広い角度範囲でレーダ波が放射されるように設定される。 The circuit board 31 is a printed circuit board made of a dielectric material.
The antenna pattern 32 includes two unit antennas A1 and A2 arranged along the Y-axis direction to form an array antenna. The unit antenna Ai includes a plurality of patch antennas arranged along the Z-axis direction, and a wiring pattern for in-phase feeding to each patch antenna. The antenna pattern 32 is set so that radar waves are radiated over a wide angle range in the Y-axis direction.

レドーム４は、レドーム本体４１と、周期構造体４２とを備える。
レドーム本体４１は、アンテナ部３が送受信するレーダ波を透過する誘電体材料で形成され、一つの面が開口された箱体である。レドーム本体４１は、当該レドーム本体４１の開口部が基部２で塞がれるように、基部２に固定され、基部２と共にアンテナ部３を収納するアンテナ収納空間を形成する。以下では、レドーム本体４１において、アンテナ収納空間内に配置されたアンテナ部３のパタン形成面３ａとの対向面を、天面４ａという。天面４ａはパタン形成面３ａと平行に形成される。 The radome 4 includes a radome main body 41 and a periodic structure 42.
The radome body 41 is a box body made of a dielectric material that transmits radar waves transmitted and received by the antenna unit 3 and has one surface open. The radome main body 41 is fixed to the base portion 2 so that the opening of the radome main body 41 is closed by the base portion 2, and together with the base portion 2, forms an antenna storage space for accommodating the antenna portion 3. In the following, in the radome main body 41, the surface of the antenna portion 3 arranged in the antenna storage space facing the pattern forming surface 3a is referred to as a top surface 4a. The top surface 4a is formed parallel to the pattern forming surface 3a.

周期構造体４２は、アンテナ収納空間内及びレドーム本体４１内におけるＸ−Ｚ断面での実効誘電率をＹ軸方向に沿って周期的に変化させるための構造である。周期構造体４２は、Ｙ軸方向に沿って配線された金属製の線状パタンＬを、天面４ａの全体に渡って一定間隔で設けた構造を有する。これにより、アンテナ収納空間内及びレドーム本体４１内におけるＸ−Ｚ断面での実効誘電率は、線状パタンＬを有する部位の方が、線状パタンＬを有さない部位より大きくなり、Ｙ軸方向に沿って周期的に変化する。 The periodic structure 42 is a structure for periodically changing the effective permittivity in the XX cross section in the antenna storage space and the radome main body 41 along the Y-axis direction. The periodic structure 42 has a structure in which metal linear patterns L wired along the Y-axis direction are provided at regular intervals over the entire top surface 4a. As a result, the effective permittivity in the XZ cross section in the antenna storage space and in the radome body 41 is larger in the portion having the linear pattern L than in the portion having no linear pattern L, and the Y axis. It changes periodically along the direction.

周期構造体４２における線状パタンＬの線幅及び配置間隔は、周期構造体４２が形成された天面４ａを対象周波数帯のレーダ波が通過し、且つ、対象周波数帯において、Ｙ軸方向への電波の伝搬を遮断するＥＢＧ構造が形成されるように設計される。つまり、Ｙ軸方向が特定方向に相当する。なお、ＥＢＧは、Electromagnetic Band Gap、すなわち、電磁バンドギャップの略である。 The line width and arrangement interval of the linear pattern L in the periodic structure 42 are such that the radar wave of the target frequency band passes through the top surface 4a on which the periodic structure 42 is formed, and in the target frequency band, in the Y-axis direction. It is designed to form an EBG structure that blocks the propagation of radio waves. That is, the Y-axis direction corresponds to a specific direction. EBG is an abbreviation for Electromagnetic Band Gap, that is, an electromagnetic band gap.

周期構造体４２のＸ軸方向への電波透過を極力阻害しないために、線状パタンＬの線幅は反射損低減のため可能な限り細くすることが好ましい。また線状パタンＬの配置間隔はλ／２以上とすることが好ましい。 In order not to hinder the transmission of radio waves in the X-axis direction of the periodic structure 42 as much as possible, it is preferable that the line width of the linear pattern L is as narrow as possible in order to reduce reflection loss. Further, the arrangement interval of the linear pattern L is preferably λ / 2 or more.

［２．設計］
周期構造体４２のＥＢＧ構造は、対象周波数と線状パタンＬの幅及び配置間隔とだけで決定されるものではなく、以下のパラメータの影響を受ける。すなわち、ＥＢＧ構造は、線状パタンＬの厚さ、レドーム本体４１の厚さ及び誘電率、回路基板３１の厚さ及び誘電率、レドーム本体４１の天面４ａとアンテナ部３のパタン形成面３ａとの間隔等の影響も受ける。従って、これらのパラメータは、シミュレーション等を用いて適宜設定される。 [2. design]
The EBG structure of the periodic structure 42 is not only determined by the target frequency, the width of the linear pattern L, and the arrangement interval, but is influenced by the following parameters. That is, the EBG structure includes the thickness of the linear pattern L, the thickness and dielectric constant of the radome main body 41, the thickness and dielectric constant of the circuit board 31, the top surface 4a of the radome main body 41 and the pattern forming surface 3a of the antenna portion 3. It is also affected by the interval between and. Therefore, these parameters are appropriately set by using simulation or the like.

対象周波数でＥＢＧ構造が機能するように設計された周期構造体４２を備えたレドーム４を用いて構成されたレーダ装置１を実施例、周期構造体４２を備えないレドームを用いて構成されたレーダ装置を比較例１とする。 An example is a radar device 1 configured by using a radome 4 provided with a periodic structure 42 designed so that the EBG structure functions at a target frequency, and a radar configured using a radome not provided with the periodic structure 42. Let the apparatus be Comparative Example 1.

図３に示すように、実施例では、対象周波数付近で通過損失が増大するのに対して、比較例１では、周波数が高くなるほど通過損失が減少する傾向はあるが、対象周波数付近で大きく変化することがない。なお、実施例において通過損失が増大する周波数は、線状パタンＬの配置間隔が狭いほど高くなり、線状パタンＬの配置間隔が広いほど低くなる傾向がある。 As shown in FIG. 3, in the embodiment, the passing loss increases in the vicinity of the target frequency, whereas in the comparative example 1, the passing loss tends to decrease as the frequency becomes higher, but it changes significantly in the vicinity of the target frequency. There is nothing to do. In the examples, the frequency at which the passing loss increases tends to be higher as the arrangement interval of the linear patterns L is narrower, and lower as the arrangement interval of the linear patterns L is wider.

図４に示すように、図中のＹ軸方向に沿って左から右に向けて対象周波数の電波を伝搬させたときに、アンテナ収納空間内及びレドーム本体４１内での伝搬が、実施例では抑制されるのに対して、比較例ではほとんど抑制されないことがわかる。 As shown in FIG. 4, when the radio wave of the target frequency is propagated from the left to the right along the Y-axis direction in the figure, the propagation in the antenna storage space and the radome body 41 is performed in the embodiment. It can be seen that while it is suppressed, it is hardly suppressed in the comparative example.

［３．効果］
以上詳述した本実施形態によれば、以下の効果を奏する。
（３ａ）レーダ装置１は、周期構造体４２を有するため、アンテナ収納空間内及びレドーム本体４１内でのＹ軸方向への電波の伝搬を抑制できる。その結果、Ｙ軸方向へ不要電波が伝搬することによって発生する干渉の影響を抑制でき、更には干渉の影響によってアンテナ部３のビームパタンが歪むことを抑制できる。 [3. effect]
According to the present embodiment described in detail above, the following effects are obtained.
(3a) Since the radar device 1 has the periodic structure 42, it is possible to suppress the propagation of radio waves in the Y-axis direction in the antenna storage space and the radome main body 41. As a result, it is possible to suppress the influence of interference generated by the propagation of unnecessary radio waves in the Y-axis direction, and further, it is possible to suppress the distortion of the beam pattern of the antenna unit 3 due to the influence of interference.

図５は、実施例、比較例１、比較例２について、アンテナ部３による水平方向のビームパタンをシミュレーションによって算出した結果を示す。なお、レドーム４を取り除いたレーダ装置を比較例２とする。 FIG. 5 shows the results of calculating the horizontal beam pattern by the antenna unit 3 by simulation for Example, Comparative Example 1, and Comparative Example 2. A radar device from which the radome 4 has been removed is referred to as Comparative Example 2.

比較例１では方向によって振幅の変動が大きいのに対して、実施例では、レドーム４による干渉の影響を受けない比較例２と同等に歪みのないビームパタンが得られることがわかる。 It can be seen that in Comparative Example 1, the amplitude fluctuates greatly depending on the direction, whereas in the Example, a beam pattern without distortion equivalent to that of Comparative Example 2 which is not affected by the interference by the radome 4 can be obtained.

（３ｂ）レーダ装置１では、周期構造体４２がレドーム本体４１と一体に設けられているため、アンテナパタン３２の正面を含む回路基板３１全面を覆うように均一にＥＢＧ構造を形成できる。その結果、アンテナ収納空間内及びレドーム本体４１内のどの地点でも、周期構造体４２による均一な伝搬抑制効果が得られ、各単位アンテナＡｉの特性を均一なものとすることができる。 (3b) In the radar device 1, since the periodic structure 42 is provided integrally with the radome main body 41, the EBG structure can be uniformly formed so as to cover the entire surface of the circuit board 31 including the front surface of the antenna pattern 32. As a result, a uniform propagation suppression effect by the periodic structure 42 can be obtained at any point in the antenna storage space and the radome main body 41, and the characteristics of each unit antenna Ai can be made uniform.

（３ｃ）レーダ装置１では、周期構造体４２がレドーム本体４１と一体に設けられているため、回路基板３１上のパタンレイアウトや部品配置が、周期構造体４２によって制約を受けることがなく、設計の自由度を高めることができる。 (3c) In the radar device 1, since the periodic structure 42 is provided integrally with the radome main body 41, the pattern layout and component arrangement on the circuit board 31 are not restricted by the periodic structure 42, and the design is performed. The degree of freedom can be increased.

（３ｄ）レーダ装置１では、周期構造体４２がＥＢＧ構造を形成するため、レーダ波の偏波の種類によらず不要電波の伝搬を抑制できる。
［４．他の実施形態］
以上、本開示の実施形態について説明したが、本開示は上述の実施形態に限定されることなく、種々変形して実施することができる。 (3d) In the radar device 1, since the periodic structure 42 forms the EBG structure, it is possible to suppress the propagation of unnecessary radio waves regardless of the type of polarization of the radar wave.
[4. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be implemented in various modifications.

（４ａ）上記実施形態では、周期構造体４２を、レドーム本体４１の天面４ａに設けたが、本開示は、これに限定されるものではない。例えば、周期構造体４２は、レドーム本体４１に埋め込まれたり、レドーム本体４１の外面側に設けられたりしてもよい。 (4a) In the above embodiment, the periodic structure 42 is provided on the top surface 4a of the radome main body 41, but the present disclosure is not limited to this. For example, the periodic structure 42 may be embedded in the radome main body 41 or may be provided on the outer surface side of the radome main body 41.

（４ｂ）上記実施形態では、周期構造体４２は、単位アンテナＡｉのアンテナ配列方向への不要電波の伝搬を抑制するが、本開示は、これに限定されるものではない。例えば、周期構造体４２は、アンテナ配列方向に代えて又はアンテナ配列方向に加えて、これとは異なる電波の伝搬を止めたい方向（例えば、Ｚ軸方向）への伝搬を抑制するように構成されてもよい。この場合、周期構造体４２は、線状パタンＬを格子状に配置した構造を有してもよい。 (4b) In the above embodiment, the periodic structure 42 suppresses the propagation of unnecessary radio waves in the antenna arrangement direction of the unit antenna Ai, but the present disclosure is not limited to this. For example, the periodic structure 42 is configured to suppress propagation in a direction (for example, the Z-axis direction) different from this, in addition to the antenna arrangement direction or in addition to the antenna arrangement direction. You may. In this case, the periodic structure 42 may have a structure in which linear patterns L are arranged in a grid pattern.

（４ｃ）上記実施形態における１つの構成要素が有する複数の機能を、複数の構成要素によって実現したり、１つの構成要素が有する１つの機能を、複数の構成要素によって実現したりしてもよい。また、複数の構成要素が有する複数の機能を、１つの構成要素によって実現したり、複数の構成要素によって実現される１つの機能を、１つの構成要素によって実現したりしてもよい。また、上記実施形態の構成の一部を省略してもよい。また、上記実施形態の構成の少なくとも一部を、他の上記実施形態の構成に対して付加又は置換してもよい。 (4c) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment.

（４ｄ）上述したレーダ装置及びレドームの他、当該レーダ装置を構成要素とするシステム、ビーム歪みの抑制方法など、種々の形態で本開示を実現することもできる。 (4d) In addition to the radar device and radome described above, the present disclosure can be realized in various forms such as a system including the radar device as a component and a method for suppressing beam distortion.

１…レーダ装置、２…基部、３…アンテナ部、３ａ…パタン形成面、４…レドーム、４ａ…天面、３１…回路基板、３２…アンテナパタン、４１…レドーム本体、４２…周期構造体、Ａ１，Ａ２…単位アンテナ、Ｌ…線状パタン。 1 ... Radar device, 2 ... Base, 3 ... Antenna, 3a ... Pattern forming surface, 4 ... Radome, 4a ... Top surface, 31 ... Circuit board, 32 ... Antenna pattern, 41 ... Radome body, 42 ... Periodic structure, A1, A2 ... Unit antenna, L ... Linear pattern.

Claims (6)

予め設定された周波数帯の電波である対象電波を送受信するアンテナパタン（３２）を有するアンテナ部（３）と、
前記アンテナ部が装着される基部（２）と、
前記対象電波を透過する材料で形成され、前記基部と共に前記アンテナ部を収納するアンテナ収納空間を形成するレドーム本体（４１）と、
前記レドーム本体と一体に設けられ、前記アンテナ収納空間内及び前記レドーム本体内における実効誘電率を、前記アンテナ部のパタン形成面（３ａ）と平行な面内で設定される特定方向に沿って周期的に変化させて、前記特定方向への前記対象電波の伝搬を阻止する電磁バンドギャップ構造を形成する周期構造体（４２）と、
を備えるレーダ装置。 An antenna unit (3) having an antenna pattern (32) for transmitting and receiving a target radio wave, which is a radio wave in a preset frequency band, and
The base portion (2) on which the antenna portion is mounted and
A radome body (41) formed of a material that transmits the target radio wave and forms an antenna storage space for accommodating the antenna portion together with the base portion.
It is provided integrally with the radome body, and the effective permittivity in the antenna storage space and the radome body is periodically set in a plane parallel to the pattern forming surface (3a) of the antenna portion along a specific direction. A periodic structure (42) that forms an electromagnetic bandgap structure that blocks the propagation of the target radio wave in the specific direction.
Radar device equipped with. 請求項１に記載のレーダ装置であって、
前記周期構造体は、前記パタン形成面と平行な面内にて、複数の線状パタンを前記特定方向に沿って一定間隔で配列した構造を有する
レーダ装置。 The radar device according to claim 1.
The periodic structure is a radar device having a structure in which a plurality of linear patterns are arranged at regular intervals along the specific direction in a plane parallel to the pattern forming surface. 請求項１又は請求項２に記載のレーダ装置であって、
前記レドーム本体は、前記パタン形成面と対向し且つ該パタン形成面と平行に形成された対向面を有し、
前記周期構造体は、前記対向面の全体に渡って形成された
レーダ装置。 The radar device according to claim 1 or 2.
The radome body has an opposing surface that faces the pattern forming surface and is formed parallel to the pattern forming surface.
The periodic structure is a radar device formed over the entire facing surface. 請求項１から請求項３までのいずれか１項に記載のレーダ装置であって、
前記アンテナパタンは、アレイアンテナを形成し、
前記特定方向は、前記アレイアンテナを構成する複数の単位アンテナの配列方向と一致するように構成された
レーダ装置。 The radar device according to any one of claims 1 to 3.
The antenna pattern forms an array antenna.
A radar device configured such that the specific direction coincides with the arrangement direction of a plurality of unit antennas constituting the array antenna. 請求項１から請求項４までのいずれか１項に記載のレーダ装置であって、
前記特定方向は、当該レーダ装置を車両に搭載した場合に、水平方向と一致するように構成された
レーダ装置。 The radar device according to any one of claims 1 to 4.
The specific direction is a radar device configured to coincide with the horizontal direction when the radar device is mounted on a vehicle. 予め設定された周波数帯の電波である対象電波を透過する材料で形成され、前記対象電波を送受信するアンテナパタン（３２）を有したアンテナ部（３）が装着される基部（２）と共に前記アンテナ部を収納するアンテナ収納空間を形成するレドーム本体（４１）と、
前記アンテナ収納空間内及び前記レドーム本体内における実効誘電率を、前記アンテナ部のパタン形成面（３ａ）と平行な面内で設定される特定方向に沿って周期的に変化させて、前記特定方向への前記対象電波の伝搬を阻止する電磁バンドギャップ構造を形成する周期構造体（４２）と、
を備えるレドーム。 The antenna together with the base (2) to which the antenna portion (3), which is formed of a material that transmits the target radio wave which is a radio wave of a preset frequency band and has an antenna pattern (32) for transmitting and receiving the target radio wave, is mounted. The radome body (41) that forms the antenna storage space for storing the parts, and
The effective permittivity in the antenna storage space and the radome body is periodically changed along a specific direction set in a plane parallel to the pattern forming surface (3a) of the antenna portion, and the specific direction is changed. A periodic structure (42) that forms an electromagnetic bandgap structure that blocks the propagation of the target radio wave to the antenna.
Radome with.
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