EP0345454A1 - Antenne réseau à microruban - Google Patents

Antenne réseau à microruban Download PDF

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Publication number
EP0345454A1
EP0345454A1 EP89107666A EP89107666A EP0345454A1 EP 0345454 A1 EP0345454 A1 EP 0345454A1 EP 89107666 A EP89107666 A EP 89107666A EP 89107666 A EP89107666 A EP 89107666A EP 0345454 A1 EP0345454 A1 EP 0345454A1
Authority
EP
European Patent Office
Prior art keywords
radiating elements
antenna
feed line
pairs
circularly polarized
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.)
Granted
Application number
EP89107666A
Other languages
German (de)
English (en)
Other versions
EP0345454B1 (fr
Inventor
Atsushi Kaise
Naoya Hirohara
Hiroshi Kasahara
Iichi Wakou
Yoichi Kaneko
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.)
Yagi Antenna Co Ltd
Original Assignee
Yagi Antenna Co Ltd
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
Priority claimed from JP63116360A external-priority patent/JPH07101811B2/ja
Priority claimed from JP63156530A external-priority patent/JPH025604A/ja
Application filed by Yagi Antenna Co Ltd filed Critical Yagi Antenna Co Ltd
Publication of EP0345454A1 publication Critical patent/EP0345454A1/fr
Application granted granted Critical
Publication of EP0345454B1 publication Critical patent/EP0345454B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0075—Stripline fed arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave

Definitions

  • the present invention relates to a planar micro­strip array antenna, and more specifically, to a microstrip array antenna for household use, adapted to receive electromagnetic waves from a broadcast satellite.
  • a parabolic antenna has been used to receive electromagnetic waves transmitted from a broadcast satellite. It is mounted on the roof or balcony of a building so as to be directed to the satellite.
  • the parabolic antenna comprises a reflector, a radiating element, and a converter, the last two being disposed on the focal position of the reflector.
  • an antenna of this type has a complicated construction, and is large and heavy. In strong winds, such as those of a typhoon, therefore, the parabolic antenna may quite possibly be broken. In snowy areas, moreover, snow may accumulate on the antenna, whereby the electromagnetic waves will be absorbed in it. The installation of the parabolic antenna, furthermore, spoils the external appearance of the building.
  • a planar microstrip array antenna is adapted to receive electromagnetic waves in a frequency band available for broadcast satellites, e.g., a band of about 12 GHz. Since this planar antenna can be mounted along the wall, or the like, of a building, it is less influenced by strong winds, and is less likely to spoil the external appearance of the building.
  • planar antenna 1 is inclined if it is directed towards broadcast satellite 3. Accordingly, antenna 1 becomes susceptible to strong winds, and snow may accumulate on it, result­ing in attenuation of the electromagnetic waves from the broadcast satellite. If the planar antenna is mounted aslant in this manner, moreover, it spoils the external appearance of building 2.
  • planar antenna is preferably given a beam tilt or a characteristic such that a beam radiated from the antenna is deviated from a direction perpendicular to the plane of the antenna.
  • planar antenna 1 can be mounted substantially vertically along the wall of building 2, as shown in Fig. 2, by giving the antenna an upward beam tilt of 23°, for example.
  • Figs. 3 and 4 show part of the prior art planar microstrip array antenna for cir­cularly polarized waves, constructed as follows.
  • Fig. 3 is a partial plan view of the antenna
  • Fig. 4 is a sectional view taken along line 4-4 of Fig. 3.
  • This antenna is formed by superposing first and second printed boards 7 and 8 on earth plate 5, with dielectric layers 6 between them. Feed line 9 with a predetermined pattern is formed on first printed board 7, while a con­ductor film is deposited on second printed board 8.
  • the distance between each two adjacent radiating elements must be set to 80 to 90 % of wavelength ⁇ o of electromagnetic waves in a free space.
  • substantial electromagnetic radiations or grating lobes are inevitably produced in undesired directions.
  • distance d between the radiating elements in each pair to be given a phase difference must be set to, e.g., 0.64 ⁇ o or less.
  • the array antenna is designed so as to be best suited for the 12-GHz band, the frequency band for broadcasting via satellite, for example, in consideration of these requirements, the outside diameter of radiating slot 10 of each radiating element is about 14 mm, and distance d is about 16 mm. Accordingly, the gap between the outer peripheral edges of the respective radiating slots of each pair of radiating elements to be given the phase difference is about 2 mm, which is not a very wide space. Since phase shift portions 12 are formed in the middle of the terminal portions of feed line 9, more­over, the configuration of the feed line is complicated. At such portions as those indicated by symbols A, B and C in Fig.
  • the feed line is situated so close to the radiating elements that undesired electro­magnetic coupling are caused between them, thus lowering the gain of the antenna. If the width of the feed line is reduced to enlarge the distance between the feed line and the radiating elements, in order to prevent these undesired electromagnetic coupling, a great loss is pro­duced in the feed line, so that the antenna gain is lowered.
  • the conventional planar array antenna with a beam tilt entails reduced gain. If the configuration of the feed line is thus complicated, moreover, the phase is asymmetrical at the diverging and bent portions. Accordingly, impedance matching is dif­ficult, and again, the gain is lowered.
  • the object of the present invention is to give a beam tilt to a planar microstrip array antenna, and to prevent lowering of the gain and characteristics of the antenna.
  • each pair of radiating elements for circularly polarized waves are arranged at a prede­termined rotational angle to each other within the plane of a planar antenna.
  • Terminal feeding portions of a feed line which correspond individually to the radiat­ing elements in pairs, are formed so that their electri­cal lengths, as measured from their diverging portions, are equal.
  • phase shifts are pro­duced between the paired radiating elements, thus per­mitting a desired beam tilt.
  • phase shift portions need not be formed in the middle of the terminal feeding portions of the feed line which correspond to the radiating ele­ments, so that the general configuration of the feed line is simple. Consequently, the gap between the feed line and the radiating elements can be made wide enough to prevent undesired electromagnetic coupling between the feeder line and the elements, thus ensuring improvement in the gain and characteristics of the antenna.
  • each radiat­ing element situated close to the feed line is partially modified so that the gap between the element and the line is widened.
  • the characteristics of the radiating elements themselves are lowered, the undesired electromagnetic coupling between the elements and the feed line are reduced, so that the gain and characteristics of the antenna, as a whole, are improved.
  • FIGs. 5 to 10 show a first embodiment of the pre­sent invention.
  • Antenna 30 of this embodiment is a planar microstrip array antenna for circularly polarized waves.
  • Fig. 5 shows an outline of antenna 30, and
  • Fig. 6 is an exploded perspective view of the antenna.
  • Antenna 30 comprises metallic body 31 in the form of a shallow tray, which doubles as an earth plate.
  • First dielectric sheet 32, printed feeder board 33, second dielectric sheet 34, printed radiation board 35, protec­tor plate 36, and cover 37 are successively superposed in layers on the front face of body 31.
  • the respective edge portions of cover 37 and body 31 are coupled together by means of frame members 38, 39 and 40, whereby the aforesaid individual members are assembled together.
  • First and second dielectric sheets 32 and 34 are formed of dielectric material, e.g., foaming poly­ethylene.
  • Cover 37 is formed of synthetic resin or fiber-reinforced plastic material.
  • the surface of cover 37 is coated with a film, such as fluorine-based resin or "TEDLER” film (trademark; pro­duced by Du Pont de Nemours & Co., USA), which is highly weatherproof, sheds water, and cannot be easily soiled with snow, ice, or dirt.
  • Protector plate 36 is formed relatively thick from highly adiabatic material, such as foaming polystyrene. Plate 35 serves to protect printed radiation board 35 and the like from a temperature rise caused by sunlight, and to prevent them from being mechanically damaged when some hard substance runs against cover 37.
  • Converter 45 is attached to the rear face of body 31. It is coupled electromagnetically to printed feeder board 33 by means of feed waveguide 46. Waveguide 46 is bent at an angle of 90° so that converter 45 is disposed parallel to the rear face of body 31. With this arrangement, the depth of the whole antenna structure can be reduced.
  • Figs. 7 and 8 show the arrangements of printed feeder board 33 and printed radiation board 35, respec­tively.
  • feed line 51 composed of a conductor film having the pattern shown in Fig. 7, is formed on dielectric film substrate 50.
  • a plurality of pairs of cir­cularly polarized wave radiating elements 62a to 65a and 62b to 65b are arranged on radiation board 35.
  • Each of these radiating elements is composed of annular radiat­ing slot 66 and substantially circular feeding patch 67.
  • Slot 66 is formed by annularly removing part of the con­ductor film on dielectric film 60 so that patch 67 of the conductor film is left in the center.
  • a pair of notches 68 are formed on the peripheral edge portion of patch 67 so as to diametrically face each other. Further, a plurality of pairs of terminal feeding por­tions 52a to 55a and 52b to 55b are formed on feed line 51 of feeder board 33, corresponding individually to the radiating elements. As shown in Figs. 9 and 10, printed boards 33 and 35 are superposed with second dielectric sheet 34 between them. The feeding portions are coupled electromagnetically to their corresponding radiating elements so as to correspond to the lower portions of the respective feeding patches of the ele­ments.
  • first pairs 52 of terminal feeding portions 52a and 52b are coupled to first pairs 62 of radiating elements 62a and 62b, respectively; second pairs 53 of portions 53a and 53b to second pairs 63 of elements 63a and 63b, third pairs 54 of portions 54a and 54b to third pairs 64 of elements 64a and 64b, and fourth pairs 55 of portions 55a and 55b to fourth pairs 65 of elements 65a and 65b.
  • Each pair of terminal feeding portions are connected by means of first diverg­ing portion 56, and each two adjacent pairs are con­nected by means of their respective second diverging portions 57.
  • First and second pairs 52 and 53 and third and fourth pairs 54 and 55 are connected by means of their corresponding diverging portions 58.
  • Each pair of radiating elements are arranged at a rotational angle of 90° to each other within the plane of the antenna. More specifically, elements 62b, 63b, 64b and 65b of first, second, third, and fourth pairs 62, 63, 64 and 65 are oriented at an angle of 90° to elements 62a, 63a, 64a and 65a, respectively. Also, the terminal feeding por­tions are oriented corresponding to the arrangement of the radiating elements. More specifically, portions 52b, 53b, 54b and 55b of first, second, third, and fourth pairs 52, 53, 54 and 55 are oriented at an angle of 90° to portions 52a, 53a, 54a and 55a, respectively. Notches 68 of each radiating element are arranged at an angle of 45° to the extending direction of each terminal feeding portion. Electromagnetic-wave beams of right-­handed circularly polarized waves are emitted from the radiating elements.
  • a phase shift of 90° is made between each pair of radiating elements, that is, between elements 62a and 62b, between elements 63a and 63b, between elements 64a and 64b, and between elements 65a and 65b.
  • the indivi­dual terminal feeding portions of the feed line have the same electrical length, and the electrical distance between first and second diverging portions 56 and 57 is uniform.
  • Phase shift portions 59 formed indivi­dually between sound and third diverging portions 57 and 58 of each second pair 53 and between second and third diverging portions 57 and 58 of each fourth pair 55. Portions 59 produce a phase delay of 180° each.
  • radiating elements 62b, 63a and 63b are subject to phase delays of 90°, 180°, and 270°, respec­tively, behind each corresponding radiating element 62a.
  • elements 64b, 65a and 65b are subject to phase delays of 90°, 180°, and 270°, respectively, behind each corresponding element 64a.
  • Elements 62a and 64a are in the same phase, that is, the former is subject to a phase delay of 360° behind the latter. Since element 63b is subject to a phase delay of 270° behind element 62a, a phase delay of 90° is produced between elements 63b and 64a. Thus, there is a phase delay of 90° be­tween each two adjacent radiating elements.
  • beam tilt angle ⁇ is about 23°.
  • Figs. 7 and 8 only partially show printed feeder board 33 and printed radiation board 35.
  • the feeder line and radiating elements are formed having the same pattern as aforesaid.
  • the distance between each two adjacent radiating elements with a phase shift (e.g., between 62a and 62b or between 62b and 63a) is set at about 0.64 ⁇ o, and the distance between each two adjacent radiating elements in the same phase (e.g., between 62a and 62a or between 65b and 65b) is set at about 0.8 ⁇ o.
  • the impedance of feed line 51 is set at 100 ohms. The width of line 51 varies from one point to another, whereby the impedance of each radiating element is matched to the line impedance.
  • Fig. 12 comparatively shows characteristic curves of the antenna according to the aforementioned embodi­ment and the prior art antenna.
  • curve P represents a characteristic of the 16-element planar microstrip array antenna for the 12-GHz band, having the conventional construction shown in Fig. 3.
  • Curve E represents a characteristic of the 16-element microstrip array antenna according to the first embodiment of the present invention shown in Figs. 7 to 10.
  • the conventional antenna has an efficiency ⁇ of 46 %, while the antenna of the invention has 70 % effi­ciency ⁇ .
  • the antenna of the present invention enjoys higher efficiency than the conventional one.
  • Fig. 11 shows a second embodiment of the present invention.
  • An antenna of this second embodiment has substantially the same construction as the antenna of the first embodiment shown in Figs. 5 to 10.
  • the second embodiment differs from the first embodiment in that the external configuration of radiating elements 72a, which, among other radiating elements 72, are situated close to feed line 71, is partially modified. More specifi­cally, each element 72a has a straight edge 73 on one side 73 which is formed by cutting off that part of the outer peripheral edge portion of the element beside line 71. Edge 73 serves to maintain a wide gap between each element 72a and line 71.
  • the distance between the respective edges of each two adja­cent elements 72a is set to, e.g., 6 mm.
  • Fig. 13 shows a characteristic curve indicative of the improvement of the efficiency of the antenna according to the second embodiment, compared to the first embodiment. As seen from Fig. 13, the gain is increased throughout the working frequency band for the antenna.
  • Fig. 14 shows a third embodiment of the present invention.
  • feed line 151 and circularly polarized wave radiating elements 163a and 163b are formed on one and the same printed board.
  • Elements 163a and 163b are formed having a pair of notches 168 each.
  • Terminal feeding portions 153a and 153b of line 151 are coupled directly to radiating elements 163a and 163b, respec­tively.
  • Adjacent feeding portions 153a and 153b are arranged at an angle of 90° to each other.
  • the second embodiment is constructed in the same manner as the first embodiment.
  • a phase shift of 90° is given between each two adjacent circularly polarized wave radiating elements.
  • the phase shift of this angle is best suited for antennas for the reception of broadcasting via satellite.
  • the phase angles of four radiating elements included in each two adjacent pairs can be set individually to 0°, 90°, 180°, and 270° by forming the feed line so that a phase difference of 180° is given between the adjacent pairs.
  • the feed line must only be designed so as to give a phase shift of 180° between each two adjacent pairs.
  • the feed line is simplified in construc­tion.
  • the phase shift of 90° results in a beam tilt of about 23°.
  • the installation angle of the antenna with respect to a vertical line can be made narrow enough for practical use by giving the planar antenna the beam tilt of 23°.
  • the arrival angle (wave angle) of electromagnetic waves from a broadcast satellite in a geostationary orbit is 31.2°, so that the planar antenna can be installed at an angle of 8.2° to the vertical line.
  • the arrival angle (wave angle) of electromagnetic waves from a broadcast satellite is 38.0°, so that the planar antenna can be installed at an angle of 15° to the vertical line.
  • the planar antenna can be mounted close to and substantially along the wall of a building or the like.
  • the possibility of the antenna being influenced by strong winds is small, snow or the like cannot accumulate on the antenna, and the installed antenna is less likely to spoil the external appearance of the building.
  • the phase difference can be selected within a range of 30° to 150° to set the beam tilt angle at will.
EP89107666A 1988-05-13 1989-04-27 Antenne réseau à microruban Expired - Lifetime EP0345454B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP63116360A JPH07101811B2 (ja) 1988-05-13 1988-05-13 ビームチルト平面アンテナ
JP116360/88 1988-05-13
JP156530/88 1988-06-24
JP63156530A JPH025604A (ja) 1988-06-24 1988-06-24 平面アンテナ

Publications (2)

Publication Number Publication Date
EP0345454A1 true EP0345454A1 (fr) 1989-12-13
EP0345454B1 EP0345454B1 (fr) 1993-11-18

Family

ID=26454706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107666A Expired - Lifetime EP0345454B1 (fr) 1988-05-13 1989-04-27 Antenne réseau à microruban

Country Status (4)

Country Link
EP (1) EP0345454B1 (fr)
KR (1) KR920002227B1 (fr)
CN (1) CN1011168B (fr)
DE (1) DE68910728T2 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468413A2 (fr) * 1990-07-25 1992-01-29 Hitachi Chemical Co., Ltd. Antenne plane avec rendement et gain élévés
EP0493014A1 (fr) * 1990-12-21 1992-07-01 Gec-Marconi Limited Antenne microbande
DE4139245A1 (de) * 1991-11-26 1993-05-27 Ekkehard Dr Ing Richter Mikrowellenschlitzantennen
US5278569A (en) * 1990-07-25 1994-01-11 Hitachi Chemical Company, Ltd. Plane antenna with high gain and antenna efficiency
WO1999017403A1 (fr) * 1997-09-26 1999-04-08 Raytheon Company Antenne reseau a plaques en micro-ruban a double polarisation pour stations de base de systemes de communication personnelle
US5923296A (en) * 1996-09-06 1999-07-13 Raytheon Company Dual polarized microstrip patch antenna array for PCS base stations
WO2000021154A2 (fr) * 1998-10-05 2000-04-13 Pates Technology Patentverwertungsgesellschaft Für Satelliten- Und Moderne Informationstechnologien Mbh Antenne plane a double foyer
WO2003075406A1 (fr) * 2002-03-06 2003-09-12 Atrax As Antenne
RU2447552C1 (ru) * 2010-10-18 2012-04-10 Российская Федерация, от имени которой выступает государственный заказчик - Государственная корпорация по атомной энергии "Росатом" Планарный излучатель
US8482472B2 (en) 2003-11-21 2013-07-09 Samsung Electronics Co., Ltd Planar antenna
CN104282997A (zh) * 2013-10-23 2015-01-14 林伟 高效的天线阵列装置
CN111525280A (zh) * 2020-04-10 2020-08-11 上海交通大学 基于罗特曼透镜的圆极化扫描阵列天线
CN112952404A (zh) * 2021-01-28 2021-06-11 东南大学 毫米波双圆极化透镜天线及电子设备
CN113078482A (zh) * 2021-03-02 2021-07-06 电子科技大学 一种用于c波段双端口圆极化高隔离的天线阵列

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970703626A (ko) * 1994-05-23 1997-07-03 데이빗 로스 클리블랜드 모듈 전자 표지판 시스템(modular electronic sign system)
CN1063328C (zh) * 1995-05-10 2001-03-21 刘喜廷 一种化瘤药及其制备方法
CN101682125B (zh) * 2007-05-17 2013-03-27 欧姆龙株式会社 阵列天线

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4543579A (en) * 1983-03-29 1985-09-24 Radio Research Laboratories, Ministry Of Posts And Telecommunications Circular polarization antenna
EP0253128A1 (fr) * 1986-06-05 1988-01-20 Sony Corporation Antenne à micro-ondes
FR2603744A1 (fr) * 1986-09-05 1988-03-11 Matsushita Electric Works Ltd Antenne plane
EP0271458A2 (fr) * 1986-11-13 1988-06-15 Communications Satellite Corporation Eléments d'antennes couplés électromagnétiquement à circuit imprimé multi-couches ayant des plaquettes ou des fentes couplées capacitivement à des conduites d'alimentation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4543579A (en) * 1983-03-29 1985-09-24 Radio Research Laboratories, Ministry Of Posts And Telecommunications Circular polarization antenna
EP0253128A1 (fr) * 1986-06-05 1988-01-20 Sony Corporation Antenne à micro-ondes
FR2603744A1 (fr) * 1986-09-05 1988-03-11 Matsushita Electric Works Ltd Antenne plane
EP0271458A2 (fr) * 1986-11-13 1988-06-15 Communications Satellite Corporation Eléments d'antennes couplés électromagnétiquement à circuit imprimé multi-couches ayant des plaquettes ou des fentes couplées capacitivement à des conduites d'alimentation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RTM - RUNDFUNKTECHNISCHE MITTEILUNGEN *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468413A2 (fr) * 1990-07-25 1992-01-29 Hitachi Chemical Co., Ltd. Antenne plane avec rendement et gain élévés
EP0468413A3 (en) * 1990-07-25 1992-08-12 Hitachi Chemical Co., Ltd. Plane antenna with high gain and antenna efficiency
US5278569A (en) * 1990-07-25 1994-01-11 Hitachi Chemical Company, Ltd. Plane antenna with high gain and antenna efficiency
EP0493014A1 (fr) * 1990-12-21 1992-07-01 Gec-Marconi Limited Antenne microbande
DE4139245A1 (de) * 1991-11-26 1993-05-27 Ekkehard Dr Ing Richter Mikrowellenschlitzantennen
US5923296A (en) * 1996-09-06 1999-07-13 Raytheon Company Dual polarized microstrip patch antenna array for PCS base stations
WO1999017403A1 (fr) * 1997-09-26 1999-04-08 Raytheon Company Antenne reseau a plaques en micro-ruban a double polarisation pour stations de base de systemes de communication personnelle
WO2000021154A3 (fr) * 1998-10-05 2002-09-26 Pates Tech Patentverwertung Antenne plane a double foyer
WO2000021154A2 (fr) * 1998-10-05 2000-04-13 Pates Technology Patentverwertungsgesellschaft Für Satelliten- Und Moderne Informationstechnologien Mbh Antenne plane a double foyer
US6580401B1 (en) 1998-10-05 2003-06-17 Pates Technology Patentverwertungs-Gesellschaft Fur Satelliten Und Moderne Informationstechnologien Mbh Bifocal planar antenna
WO2003075406A1 (fr) * 2002-03-06 2003-09-12 Atrax As Antenne
US8482472B2 (en) 2003-11-21 2013-07-09 Samsung Electronics Co., Ltd Planar antenna
RU2447552C1 (ru) * 2010-10-18 2012-04-10 Российская Федерация, от имени которой выступает государственный заказчик - Государственная корпорация по атомной энергии "Росатом" Планарный излучатель
CN104282997A (zh) * 2013-10-23 2015-01-14 林伟 高效的天线阵列装置
CN104282997B (zh) * 2013-10-23 2017-06-16 林伟 高效的天线阵列装置
CN111525280A (zh) * 2020-04-10 2020-08-11 上海交通大学 基于罗特曼透镜的圆极化扫描阵列天线
CN112952404A (zh) * 2021-01-28 2021-06-11 东南大学 毫米波双圆极化透镜天线及电子设备
CN113078482A (zh) * 2021-03-02 2021-07-06 电子科技大学 一种用于c波段双端口圆极化高隔离的天线阵列

Also Published As

Publication number Publication date
KR920002227B1 (ko) 1992-03-20
KR890017824A (ko) 1989-12-18
DE68910728D1 (de) 1993-12-23
DE68910728T2 (de) 1994-06-23
CN1037803A (zh) 1989-12-06
EP0345454B1 (fr) 1993-11-18
CN1011168B (zh) 1991-01-09

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