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USRE47068E1 - Microstrip antenna and radar module - Google Patents

Microstrip antenna and radar module Download PDF

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Publication number
USRE47068E1
USRE47068E1 US15/286,123 US201115286123A USRE47068E US RE47068 E1 USRE47068 E1 US RE47068E1 US 201115286123 A US201115286123 A US 201115286123A US RE47068 E USRE47068 E US RE47068E
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US
United States
Prior art keywords
antenna
ground conductor
radar module
wedge shape
antenna substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US15/286,123
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English (en)
Inventor
Minoru Tajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to US15/286,123 priority Critical patent/USRE47068E1/en
Application granted granted Critical
Publication of USRE47068E1 publication Critical patent/USRE47068E1/en
Active legal-status Critical Current
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Classifications

    • 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
    • G01S7/032—Constructional details for solid-state radar subsystems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/065—Patch antenna array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • G01S2007/027—
    • 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
    • G01S7/027—Constructional details of housings, e.g. form, type, material or ruggedness

Definitions

  • the present invention relates to a microstrip antenna and a radar module, and more particularly to a microstrip antenna and a radar module capable of reducing diffracted waves generated at edges of a ground conductor.
  • a microstrip antenna is one of antennas used in in-vehicle millimeter-wave radars.
  • the microstrip antenna can be manufactured by a process of etching a conductor film on an insulating substrate, and therefore downsizing and cost reduction thereof can be achieved.
  • antennas used in in-vehicle millimeter-wave radars have a smaller vertical-plane beam width to only focus on target objects on the road, while having a larger horizontal-plane beam width so as to provide a wide detection range.
  • the antenna is likely to be affected by diffracted waves generated at edges of a ground conductor.
  • diffracted waves interfere with an original received wave, a phase difference periodically varies with different horizontal angles of the beam. This variation causes ripples in an antenna gain and a phase radiation pattern, which degrades detection performances of the radar, such as angle measurement accuracy.
  • Patent Literature 1 discloses a technique in which a passive element is provided on edges of an antenna substrate in a microstrip antenna, and the passive element has an electrical width of one-half of a wavelength of transmitted or received electromagnetic waves, so that diffracted waves generated from a radiation element side and diffracted waves radiated from an antenna substrate edge-side portion cancel out their phases with each other.
  • Patent Literature 1 also has problems in that a receiving antenna is designed for only a single channel, and its frequency band is limited because the width of the passive element is one-half of the wavelength.
  • the present invention has been achieved to solve the above problems, and an object of the present invention is to provide a microstrip antenna and a radar module capable of reducing diffracted waves generated at edges of a ground conductor, while suppressing cost increase.
  • a microstrip antenna in which a ground conductor is provided to be opposed to a patch conductor, and along an edge of the ground conductor, a shape with a tapered tip end is provided in a repeated manner.
  • diffracted waves generated at edges of a ground conductor are reduced, while suppressing cost increase.
  • FIG. 1 is a plan view of a schematic configuration of a radar module according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along a line A-A′ in FIG. 1 .
  • FIG. 3 is a plan view of a schematic configuration of a ground conductor used in the radar module according to the first embodiment of the present invention.
  • FIG. 4 is a plan view of a schematic configuration of a ground conductor used in a radar module according to a second embodiment of the present invention.
  • FIG. 1 is a plan view of a schematic configuration of a radar module according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along a line A-A′ in FIG. 1 .
  • FIG. 3 is a plan view of a schematic configuration of a ground conductor used in the radar module according to the first embodiment of the present invention.
  • patch conductors 2 a to 2 d and 3 are formed on an antenna substrate 1 , while a ground conductor 8 is provided on a back surface of the antenna substrate 1 to be opposed to the patch conductors 2 a to 2 d and 3 , thereby constituting a microstrip antenna.
  • the patch conductors 2 a to 2 d and 3 are respectively arranged in a certain direction with a predetermined space therebetween.
  • the patch conductors 2 a to 2 d are connected respectively to feeding terminals 4 a to 4 d through feeding lines 6 a to 6 d, thereby constituting a receiving antenna RN for four channels CH 1 to CH 4 .
  • the patch conductor 3 is connected to a feeding terminal 5 through a feeding line 7 , thereby constituting a transmitting antenna TN.
  • the ground conductor 8 is formed over the entire back surface of the antenna substrate 1 .
  • wedge shapes 14 are provided along edges of the ground conductor 8 in a repeated manner.
  • an antenna polarization plane Pa forms an angle of 45 degrees
  • the wedge shapes 14 are angled to intersect with the antenna polarization plane Pa. More preferably, the wedge shapes 14 are angled to intersect with the antenna polarization plane Pa at a right angle.
  • Coupling slots 12 a to 12 d and 13 are formed on the ground conductor 8 .
  • the coupling slots 12 a to 12 d and 13 are located to correspond to the respective positions of the feeding terminals 4 a to 4 d and 5 .
  • the coupling slots 12 a to 12 d and 13 and the wedge shapes 14 are formed by patterning the ground conductor 8 . Particularly, the coupling slots 12 a to 12 d and 13 and the wedge shapes 14 are formed all at once during a process of etching the ground conductor 8 .
  • a resin substrate of glass epoxy resin, Teflon (registered trademark) resin or the like can be used, or an insulating substrate of ceramic or the like can be used.
  • a material of the patch conductors 2 a to 2 d and 3 the feeding lines 6 a to 6 d, the feeding terminals 4 a to 4 d, and the ground conductor 8 , a thin film of metal, such as Al and Cu, can be used.
  • the patch conductors 2 a to 2 d and 3 can be formed into a rectangular shape, a polygonal shape, a round shape, an elliptical shape or the like.
  • Circuit components 11 a to 11 e are mounted on a circuit board 9 , while a back surface of the antenna substrate 1 is bonded to the ground conductor 8 via a bonding layer 10 .
  • the circuit board 9 can be a double printed board, a multilayer printed board or a build-up board.
  • the circuit components 11 a to 11 e can be an integrated circuit, such as an IC, or an electronic component, such as a transistor, a resistor, and a condenser.
  • the circuit components 11 a to 11 e generate a transmission wave to be transmitted through the transmitting antenna TN and perform a receiving process for a reflected wave received through the receiving antenna RN.
  • the transmission wave generated on the circuit board 9 is transmitted to the feeding terminal 5 on the antenna substrate 1 through the coupling slot 13 .
  • the transmission wave transmitted to the feeding terminal 5 is then transmitted to the patch conductor 3 through the feeding line 7 , so that electric power is supplied to the transmitting antenna TN to radiate the transmission wave into space.
  • the receiving antenna RN When the transmission wave reaches a target, the receiving antenna RN receives a reflected wave from the target. When the reflected wave received by the receiving antenna RN reaches the patch conductors 2 a to 2 d, electric power is supplied to the feeding terminals 4 a to 4 d respectively through the feeding lines 6 a to 6 d to transmit the reflected wave to the circuit board 9 respectively through the coupling slots 12 a to 12 d.
  • a receiving process based on a signal transmitted to the circuit board 9 is performed to calculate information on an azimuth of the target, information on a relative distance to the target, information on a relative speed to the target, and the like.
  • horizontal plane scanning is performed electronically by signal processing, such as digital beamforming, thereby improving angle measurement accuracy on the horizontal plane.
  • Diffracted waves are generated due to electric field components parallel to an outer periphery of the ground conductor 8 .
  • the wedge shapes 14 are thus provided along the each edge of the ground conductor 8 in a repeated manner to reduce electric field components of the antenna polarization plane Pa that are parallel to the outer periphery of the ground conductor 8 , thereby reducing diffracted waves generated at the edges of the ground conductor 8 .
  • it is possible to suppress interference of the diffracted waves with an original reflected wave, and thus it becomes possible to reduce ripples caused in an antenna gain and a phase radiation pattern. Therefore, detection performances of the radar, such as angle measurement accuracy, are improved even when a horizontal-plane beam width increases.
  • the wedge shapes 14 are formed by the process of etching the ground conductor 8 . Therefore, when the wedge shapes 14 are formed all at once simultaneously with forming the coupling slots 12 a to 12 d and 13 , an increase in the number of processes can be prevented while eliminating the need for extra materials such as a radio wave absorber, thereby suppressing cost increase.
  • FIG. 4 is a plan view of a schematic configuration of a ground conductor used in a radar module according to a second embodiment of the present invention.
  • wedge shapes 15 are provided at the edges of the ground conductor 8 , in place of the wedge shapes 14 according to the first embodiment.
  • the wedge shapes 14 according to the first embodiment are angled to intersect with the antenna polarization plane Pa of 45-degree polarization at a right angle.
  • the wedge shapes 15 according to the second embodiment are formed to be located vertically with respect to the edges of the ground conductor 8 to intersect with an antenna polarization plane Pa′ of vertical polarization at a right angle.
  • This configuration can reduce electric field components of the antenna polarization plane Pa′ that are parallel to the outer periphery of the ground conductor 8 , and thus reduce diffracted waves generated at the edges of the ground conductor 8 , even when the vertical polarization is used in place of the 45-degree polarization.
  • the present invention is not limited to the wedge shapes 14 , but can use any shape as long as it has a tapered tip end, and can be a wave-curved shape, for example.
  • the radar module according to the present invention can reduce diffracted waves generated at edges of a ground conductor while suppressing cost increase, and thus the radar module is suitable for a means for improving detection performances of an in-vehicle millimeter-wave radar, such as angle measurement accuracy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
US15/286,123 2010-02-05 2011-02-01 Microstrip antenna and radar module Active 2031-08-13 USRE47068E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/286,123 USRE47068E1 (en) 2010-02-05 2011-02-01 Microstrip antenna and radar module

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2010024366 2010-02-05
JP2010-024366 2010-02-05
PCT/JP2011/051988 WO2011096381A1 (fr) 2010-02-05 2011-02-01 Antenne microruban et module radar
US13/517,439 US8907848B2 (en) 2010-02-05 2011-02-01 Microstrip antenna and radar module
US15/286,123 USRE47068E1 (en) 2010-02-05 2011-02-01 Microstrip antenna and radar module

Publications (1)

Publication Number Publication Date
USRE47068E1 true USRE47068E1 (en) 2018-10-02

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US15/286,123 Active 2031-08-13 USRE47068E1 (en) 2010-02-05 2011-02-01 Microstrip antenna and radar module
US13/517,439 Ceased US8907848B2 (en) 2010-02-05 2011-02-01 Microstrip antenna and radar module

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US13/517,439 Ceased US8907848B2 (en) 2010-02-05 2011-02-01 Microstrip antenna and radar module

Country Status (4)

Country Link
US (2) USRE47068E1 (fr)
EP (1) EP2533362B1 (fr)
JP (1) JP5377671B2 (fr)
WO (1) WO2011096381A1 (fr)

Families Citing this family (15)

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Publication number Priority date Publication date Assignee Title
US9755311B2 (en) * 2012-05-29 2017-09-05 Samsung Electronics Co., Ltd. Circularly polarized patch antennas, antenna arrays, and devices including such antennas and arrays
DE102014200692A1 (de) * 2014-01-16 2015-07-16 Robert Bosch Gmbh Verfahren, antennenanordnung, radarsystem und fahrzeug
DE102014200690A1 (de) 2014-01-16 2015-07-16 Robert Bosch Gmbh Antennenanordnung, radarsystem, fahrzeug und verfahren
US10103447B2 (en) 2014-06-13 2018-10-16 Nxp Usa, Inc. Integrated circuit package with radio frequency coupling structure
US9917372B2 (en) 2014-06-13 2018-03-13 Nxp Usa, Inc. Integrated circuit package with radio frequency coupling arrangement
US10225925B2 (en) * 2014-08-29 2019-03-05 Nxp Usa, Inc. Radio frequency coupling and transition structure
US9887449B2 (en) * 2014-08-29 2018-02-06 Nxp Usa, Inc. Radio frequency coupling structure and a method of manufacturing thereof
DE102014219113A1 (de) 2014-09-23 2016-03-24 Robert Bosch Gmbh MIMO-Radarvorrichtung zum entkoppelten Bestimmen eines Elevationswinkels und eines Azimutwinkels eines Objekts und Verfahren zum Betreiben einer MIMO-Radarvorrichtung
DE102015203454A1 (de) 2014-10-07 2016-04-07 Robert Bosch Gmbh Verfahren und MIMO-Radarvorrichtung zum Bestimmen eines Lagewinkels eines Objekts
JP6499103B2 (ja) * 2016-03-10 2019-04-10 株式会社豊田中央研究所 アンテナ装置
US10109910B2 (en) * 2016-05-26 2018-10-23 Delphi Technologies, Inc. Antenna device with accurate beam elevation control useable on an automated vehicle
EP3482503A4 (fr) * 2016-07-08 2020-03-04 Magna Electronics Inc. Système radar mimo 2d pour véhicule
JP6910830B2 (ja) * 2017-04-04 2021-07-28 株式会社デンソーテン 平面アンテナ装置
US11469511B2 (en) 2018-01-10 2022-10-11 Mitsubishi Electric Corporation Waveguide microstrip line converter and antenna device
KR102609138B1 (ko) * 2019-04-29 2023-12-05 삼성전기주식회사 인쇄회로기판 어셈블리

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JPH08167812A (ja) 1994-12-13 1996-06-25 Toshiba Corp アレイアンテナ装置
JPH11284429A (ja) 1998-03-27 1999-10-15 Japan Radio Co Ltd 回折波抑圧型マイクロストリップアンテナ
US20040041732A1 (en) 2001-10-03 2004-03-04 Masayoshi Aikawa Multielement planar antenna
JP2004112394A (ja) 2002-09-19 2004-04-08 Hisamatsu Nakano マイクロストリップアンテナおよびそれを用いた無線通信装置
JP2005094440A (ja) 2003-09-18 2005-04-07 Tdk Corp アンテナ装置およびレーダ装置
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JP2006148688A (ja) 2004-11-22 2006-06-08 Murata Mfg Co Ltd アンテナ構造およびそれを備えた無線通信機
JP2007124201A (ja) 2005-10-27 2007-05-17 Kyocera Corp アンテナモジュール
US7538729B2 (en) * 2007-02-15 2009-05-26 Advanced Connectek Inc. Coupling antenna
US20090153433A1 (en) * 2005-12-12 2009-06-18 Matsushita Electric Industrial Co., Ltd. Antenna device
US7605762B2 (en) * 2006-12-08 2009-10-20 Advanced Connectek Inc. Antenna
US8081122B2 (en) * 2009-06-10 2011-12-20 Tdk Corporation Folded slotted monopole antenna

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JPH0746033A (ja) 1990-03-15 1995-02-14 Hughes Aircraft Co 多周波パッチアンテナ装置
US5043738A (en) 1990-03-15 1991-08-27 Hughes Aircraft Company Plural frequency patch antenna assembly
US5245745A (en) * 1990-07-11 1993-09-21 Ball Corporation Method of making a thick-film patch antenna structure
US5414434A (en) * 1993-08-24 1995-05-09 Raytheon Company Patch coupled aperature array antenna
JPH08167812A (ja) 1994-12-13 1996-06-25 Toshiba Corp アレイアンテナ装置
JPH11284429A (ja) 1998-03-27 1999-10-15 Japan Radio Co Ltd 回折波抑圧型マイクロストリップアンテナ
US7046196B1 (en) * 1999-09-30 2006-05-16 Harada Industry Co., Ltd. Dual-band microstrip antenna
US20040041732A1 (en) 2001-10-03 2004-03-04 Masayoshi Aikawa Multielement planar antenna
JP2004112394A (ja) 2002-09-19 2004-04-08 Hisamatsu Nakano マイクロストリップアンテナおよびそれを用いた無線通信装置
JP2005094440A (ja) 2003-09-18 2005-04-07 Tdk Corp アンテナ装置およびレーダ装置
JP2006148688A (ja) 2004-11-22 2006-06-08 Murata Mfg Co Ltd アンテナ構造およびそれを備えた無線通信機
JP2007124201A (ja) 2005-10-27 2007-05-17 Kyocera Corp アンテナモジュール
US20090153433A1 (en) * 2005-12-12 2009-06-18 Matsushita Electric Industrial Co., Ltd. Antenna device
US7605762B2 (en) * 2006-12-08 2009-10-20 Advanced Connectek Inc. Antenna
US7538729B2 (en) * 2007-02-15 2009-05-26 Advanced Connectek Inc. Coupling antenna
US8081122B2 (en) * 2009-06-10 2011-12-20 Tdk Corporation Folded slotted monopole antenna

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Huff et al., "Improvements in the Performance of Microstrip Antennas on Finite Ground Planes Through Ground Plane Edge Serrations" IEEE Microwave and Wireless Components Letters, (Aug. 1, 2002), vol. 12 No. 8, pp. 308-310.
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Also Published As

Publication number Publication date
EP2533362A4 (fr) 2013-12-11
JPWO2011096381A1 (ja) 2013-06-10
JP5377671B2 (ja) 2013-12-25
US8907848B2 (en) 2014-12-09
WO2011096381A1 (fr) 2011-08-11
US20120256795A1 (en) 2012-10-11
EP2533362A1 (fr) 2012-12-12
EP2533362B1 (fr) 2017-08-16

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