WO2002071538A1 - Antenne a reflecteur - Google Patents

Antenne a reflecteur Download PDF

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Publication number
WO2002071538A1
WO2002071538A1 PCT/JP2001/006236 JP0106236W WO02071538A1 WO 2002071538 A1 WO2002071538 A1 WO 2002071538A1 JP 0106236 W JP0106236 W JP 0106236W WO 02071538 A1 WO02071538 A1 WO 02071538A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
antenna
antenna device
axis
mirror
Prior art date
Application number
PCT/JP2001/006236
Other languages
English (en)
Japanese (ja)
Inventor
Yoshio Inasawa
Yoshihiko Konishi
Shigeru Makino
Naofumi Yoneda
Moriyasu Miyazaki
Shuji Urasaki
Izuru Naito
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2002/001863 priority Critical patent/WO2002071540A1/fr
Priority to DE60204946T priority patent/DE60204946T2/de
Priority to EP02701640A priority patent/EP1365473B1/fr
Priority to JP2002570345A priority patent/JP3788784B2/ja
Priority to US10/275,064 priority patent/US6741216B2/en
Publication of WO2002071538A1 publication Critical patent/WO2002071538A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/16—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device
    • H01Q3/20—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device wherein the primary active element is fixed and the reflecting device is movable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/193—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface with feed supported subreflector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
    • H01Q3/08—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation

Definitions

  • the present invention relates to a reflector antenna device, and more particularly to a reflector antenna device that performs scanning by rotating around two axes perpendicular to each other. Height
  • This reflector antenna device usually has a reflector having a sub-reflector receiving irradiation of electromagnetic waves from a radiator, and a main reflector reflecting the electromagnetic waves reflected from the sub-reflector and directing the target to a target.
  • a reflector having a sub-reflector receiving irradiation of electromagnetic waves from a radiator, and a main reflector reflecting the electromagnetic waves reflected from the sub-reflector and directing the target to a target.
  • the height in the azimuth axis direction but also the length dimension in the elevation axis direction and the width dimension in the direction perpendicular thereto are large.
  • the conventional reflector antenna device when there is a requirement to install a reflector antenna device in a limited, relatively small space, such as when it is mounted on an aircraft, the conventional reflector antenna device has a large operating area for the reflector described above. could not. It has been proposed that small antenna elements are fixedly arranged in an array to reduce the height, and that the directivity of the antenna elements is electrically controlled to perform scanning. The equipment for this is extremely expensive and is of little practical use.
  • an object of the present invention is to provide a reflector antenna device which can be installed in a small space, has sufficient practicality, and performs scanning by rotating around two axes perpendicular to each other. Disclosure of the invention
  • means for solving the above-mentioned problems are as follows.
  • the elevation axis is the azimuth axis of the reflector.
  • the reflector has a substantially rectangular opening long in the direction of the elevation axis, passing through a position substantially at the center of the direction and substantially at the center of the direction perpendicular to the elevation axis of the reflector, and
  • the mirror surface is modified so that the mirror receives and reflects substantially all of the supplied electromagnetic waves, so that the antenna height does not increase when the above-mentioned mirror rotates around the axis of rotation. This is the characteristic reflector antenna device.
  • the reflecting mirror may include a sub-reflecting mirror that receives the electromagnetic wave from the radiator, and a main reflecting mirror that reflects the electromagnetic wave reflected from the sub-reflecting mirror and directs the target to a target. it can.
  • the reflecting mirror may be a reflecting mirror array including a plurality of reflecting mirror elements arranged with the elevation axes aligned.
  • Each of the reflector antennas of the main reflector has a substantially rectangular opening shape, and in order to suppress grating lobes, each reflector antenna has a rectangular aperture when viewed from the mirror axis direction.
  • the mirror surface was modified so that the electromagnetic field distribution at the aperture became a nearly uniform distribution.
  • a mirror surface is set so that the radiator is parallel to the azimuth rotation plane, and the center axis of the radiator is aligned with the elevation axis.
  • the mirror surface is set so that the sub-reflector does not become blocking when viewed from the mirror axis direction.
  • the reflector antenna is a Cassegrain antenna.
  • the reflector antenna is a Gregorian antenna.
  • FIG. 1 is a schematic side view showing a reflector antenna device according to one embodiment of the present invention.
  • FIG. 2 is a schematic top view showing the reflector antenna device of FIG.
  • FIG. 3 is a schematic front view showing the reflector antenna device of FIG.
  • FIG. 4 is a schematic side view showing an array-type reflector antenna device according to another embodiment of the present invention.
  • FIG. 5 is a schematic top view showing the reflector antenna device of FIG.
  • FIG. 6 is a schematic enlarged front view showing the reflector antenna of the reflector antenna device of FIG.
  • FIG. 7 is a schematic side view showing an array-type reflecting mirror antenna device according to the third embodiment of the present invention.
  • FIG. 8 is a schematic top view showing the reflector antenna device of FIG.
  • FIG. 9 is a schematic side view showing a reflector antenna of a reflector antenna device according to a fourth embodiment of the present invention.
  • FIG. 10 is a schematic side view showing an array-type reflector antenna device according to a fifth embodiment of the present invention.
  • FIG. 11 is a schematic top view showing the reflector antenna device of FIG.
  • FIG. 12 is a schematic side view showing an array-type reflector antenna device according to a sixth embodiment of the present invention.
  • FIG. 13 is a schematic top view showing the reflector antenna device of FIG.
  • FIG. 14 is a schematic side view showing a reflector antenna device according to a seventh embodiment of the present invention.o Best mode for carrying out the invention
  • Embodiment 1 of a reflector antenna device is shown in FIGS.
  • the reflector antenna device includes a reflector 1 and a rotation mechanism 4 for rotating the reflector 1 around an azimuth axis 2 and an elevation axis 3.
  • the reflector 1 is composed of a sub-reflector 6 that receives electromagnetic waves from a radiator 5 that emits electromagnetic waves, and a main reflector that reflects the electromagnetic waves reflected from the sub-reflector 6 and directs it to a target (not shown).
  • 7 and Sub-reflector 6 is separated from main reflector 7 It is supported by the support mechanism 8 in an aligned state.
  • the reflection mirror 1 is supported by a rotation support mechanism 9 so as to be rotatable around the rotation axis 3 with respect to the turntable 10, and is rotated by the rotation drive source 11.
  • the first feeder joint 1 3 is connected to the feeder line 12 at a position on the elevation axis 3. Has been inserted.
  • the reflecting mirror 1 thus supported so as to be rotatable around the rotation axis 3 with respect to the rotary table 10 is also supported so that the rotary table 10 can be rotated around the azimuth axis 2. It can be rotated around the azimuth axis 2 by the rotary drive source 14 together with the rotary table 10.
  • a feed line 12 connecting the feed device 15 and the radiator 5 includes a second joint 1 at the rotation center of the turntable 10, that is, at a position on the azimuth axis 2 of the reflector 1. 6 is provided so that the rotary table 10 and the reflecting mirror 1 thereon can be allowed to rotate around the azimuth axis 2 at this portion.
  • the reflecting mirror 1 has a main reflecting mirror 7 and a sub-reflecting mirror 6, but has a length D (see FIGS. 1 and 2) in the direction of the elevation axis 3 as a whole.
  • the antenna has a width of W (see Figs. 2 and 3) in a direction perpendicular to the one-way axis 3 and has a substantially rectangular aperture.
  • the elevation axis 3 passes through a position substantially at the center of the distance (height) H in the azimuth axis 2 direction (height direction) of the reflector 1 (see FIGS. 1 and 3), and the elevation axis of the reflector 1 This is the axis passing through the position almost at the center of the direction (width direction) W perpendicular to 3 (see FIGS. 2 and 3).
  • the range in which the reflecting mirror 1 moves that is, the operation area S, as shown in FIG. Inside the circle Y drawn by the outermost edge of.
  • the operating area S represented by the circle Y is extremely small, for example, as compared to the antenna described in the Wakana paper mentioned above, and the antenna height does not increase even when the reflector rotates around the elevation axis. .
  • the main reflecting mirror 7 and the sub-reflecting mirror 6 of the reflecting mirror 1 are each mirror-polished so as to receive and reflect substantially all of the electromagnetic waves supplied to the reflecting mirror 1.
  • Mirror adjustment is a method for controlling the antenna aperture shape and antenna aperture distribution, and is described in detail in, for example, IEE Proc. Micro. Antennas Propag. Vol. 146, No. 1, p. 60-64, 1999. Described.
  • the antenna has been modified so that the aperture shape is substantially rectangular, and the mirror surface has been modified so that the aperture distribution is uniform.
  • the radio wave radiated from the primary radiator 5 is reflected by the sub-reflector 6, and the reflected radio wave is reflected by the main reflector 7 and directed to a target (not shown).
  • a target not shown.
  • the main reflecting mirror 7, the sub-reflecting mirror 6, the supporting mechanism 8 for the sub-reflecting mirror, the primary radiator 5, and the first part 1 2a of the feed line 12 rotate about the elevation rotation axis 3. be able to.
  • the feed line 1 2a is connected to the second portion 1 2b through the joint 1 3 to supply power to the primary radiator 5 even when the antenna rotates around the elevation axis 3. be able to.
  • Fig. 2 is a view of the reflector antenna device viewed from above (from the mirror axis direction).
  • this reflector antenna device In order to prevent the antenna height from increasing even when scanning in the elevation direction, this reflector antenna device must have not only the antenna height H but also the size in the direction perpendicular to the elevation axis 3 and the mirror axis (azimuth axis 2) of the antenna. (Width)
  • the antenna is designed so that W becomes small.
  • the design procedure of the reflector antenna device consists of the following two steps.
  • the antenna height H including the main reflector 7 and the sub-reflector 6 is the highest at the same aperture diameter. This is a condition for reducing
  • the antenna when scanning around the elevation axis 3 (elevation direction)
  • the mirror surface is modified so that the size (width) W of the main reflector 7 in the direction perpendicular to both the azimuth axis 2 and the elevation axis 3 is reduced.
  • Mirror modification is a method for controlling the shape of the antenna aperture and the distribution of the antenna aperture. For example, IEE Proc. Microw. Antennas Propag. Vol. 146, No. l, pp. 60- 64, 1999, etc.
  • various antenna aperture shapes and aperture distributions can be realized.
  • Figure 3 shows the antenna realized when the antenna is designed using the above-described method, as viewed from the direction of the elevation axis 3.
  • the antenna does not go out of the fixed circle Y centered on the rotation axis 3 and can realize a low antenna height.
  • the diameter D of the antenna the gain of the antenna and the beam width in the azimuth direction can be adjusted.
  • the aperture distribution of the antenna can be controlled to adjust the antenna gain and beam width.
  • This antenna has the effect that it can be applied even when it is rotated around the elevation axis 3 and the antenna height is low, and there are restrictions on where the antenna is installed.
  • FIG. 4 is a side view and FIG. 5 is a top view of another embodiment of the reflector antenna device of the present invention.
  • the same or corresponding parts as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and their description is omitted.
  • Some of them are: 1 is a reflecting mirror, 7 is a main reflecting mirror, 6 is a sub-reflecting mirror, 8 is a supporting mechanism of a sub-reflecting mirror, 5 is a primary radiator, 1 is a feed line, 2 is an azimuth axis
  • Reference numeral 3 denotes an elevation rotation axis
  • reference numerals 13 and 16 denote joints
  • reference numeral 10 denotes a rotary table.
  • the antenna can rotate about two axes, around the azimuth axis 2 and around the elevation axis 3, and its mechanism is the same as that of the reflector antenna device of the above-described embodiment.
  • this reflector antenna device not one reflector (antenna) but two antenna elements 1, that is, two Cassegrain antennas are used.
  • the rotation around the azimuth axis 2 does not cause each antenna element 1 to rotate, but causes the antenna element 1 supported by the rotating tape 10 to rotate as the whole array.
  • the lowest antenna in the posture without scanning the antenna is / of the antenna aperture diameter. Therefore, an antenna that is half the size in three directions of the elevation axis of the antenna has half the height.
  • the height of the antenna can be made lower than in the previous embodiment, and there is an effect that the present invention can be applied even when the dimensional installation environment of the reflector antenna device is more severe.
  • grating lobes generated due to the use of a two-element array antenna which is usually several wavelengths away are suppressed.
  • the mirror surface is modified as shown in Fig. 6.
  • ⁇ a is the main reflector before mirror modification
  • 6a is the sub-reflector before mirror modification
  • 7b is the main reflector after mirror modification
  • 6b is the sub-reflector after mirror modification.
  • the mirror surface is modified so that the opening viewed from the mirror axis direction is as close as possible to the rectangular opening.
  • the aperture distribution to be realized is set so as to be uniform.
  • An antenna with a rectangular aperture having two uniform aperture distributions is equivalent to an antenna with one large aperture, and in principle no grating aperture occurs.
  • FIG. 7 is a side view and FIG. 8 is a top view of the reflector antenna device according to the present invention.
  • 1 is a reflecting mirror
  • 7 is a main reflecting mirror
  • 6 is a sub-reflecting mirror
  • 8 is a support mechanism for a sub-reflecting mirror
  • 5 is a primary radiator
  • 1 2 is a feed path
  • 3 is an elevation rotation axis
  • 1 3 16 are rotary joints
  • 10 is a rotary table.
  • the reflecting mirror 1 can rotate about two axes, the azimuth axis and the elevation axis, and the mechanism is the same as in the previous embodiment.
  • this embodiment Unlike the previous embodiment, this embodiment has an array antenna configuration using two offset Cassegrain antennas.
  • the effect of blocking by the sub-reflector can be reduced, the characteristics of the antenna such as the side rope level can be improved, and not only the dimensional restrictions but also the specifications of the antenna such as the side lobe can be improved.
  • there is an effect that the present invention can be applied even in the case where is severe.
  • FIG. 9 is a side view of a reflector antenna device according to still another embodiment of the present invention.
  • 1 is a reflecting mirror
  • 7 is a main reflecting mirror
  • 6 is a sub-reflecting mirror
  • 8 is a supporting mechanism of a sub-reflecting mirror
  • 5 is a primary radiator
  • 1 is a power supply line
  • 2 is an azimuth
  • the axis, 3 is an elevation rotation axis
  • 16 is a rotary joint
  • 10 is a rotary table.
  • a mirror surface is designed so that the direction of the primary radiator 5 is parallel to the azimuth rotation plane.
  • the primary radiator 5 can be rotated with respect to the main reflecting mirror 7, there is an effect that it is not necessary to rotate the primary radiator 5 during the rotation of the elevation.
  • the power supply path 12 for supplying power to the two primary radiators 5 can be connected without bending, there is an effect that the structure can be simplified.
  • there is an effect that the structural load is small when driven mechanically.
  • FIG. 10 shows a side view and FIG. 11 shows a top view of the reflector antenna device according to the present invention.
  • the same or corresponding components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and their description is omitted.
  • Some of them are: 1 is a reflecting mirror, 7 is a main reflecting mirror, 6 is a sub-reflecting mirror, 8 is a supporting mechanism of a sub-reflecting mirror, 5 is a primary radiator, 1 is a feed line, 2 is an azimuth axis
  • Numeral 3 is the rotation axis of the elevation, 16 is the mouth joint, and 10 is the rotating tape.
  • the reflector antenna device of this embodiment is basically the same as that of the previous embodiment, but when viewed from the direction of the azimuth axis 2 (mirror axis), the shadow by the sub-reflector 6 does not block. This is a mirror surface design.
  • the effect of blocking by the projection mirror 6 can be eliminated, and there is an effect that the characteristics of the antenna such as the side lobe level can be improved.
  • FIG. 12 is a side view and FIG. 13 is a top view of the reflector antenna device according to the present invention.
  • the same or corresponding components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and their description is omitted.
  • Some of them are: 1 is a reflecting mirror, 7 is a main reflecting mirror, 6 is a sub-reflecting mirror, 8 is a supporting mechanism of a sub-reflecting mirror, 5 is a primary radiator, 1 is a feed line, 2 is an azimuth axis , 3 is an elevation rotation axis, 13 and 16 are rotary joints, and 10 is a rotary table.
  • FIGS. 12 and 13 show examples of the reflector 1 having an array antenna configuration using four offset Cassegrain antennas. In this embodiment, since the diameter of each of the offset Cassegrain antennas can be reduced, there is an effect that the antenna height of the reflector 1 of the reflector antenna device that can be realized can be reduced.
  • FIG. 14 is a side view of a reflector antenna device according to still another embodiment of the present invention.
  • 1 is a reflector
  • 7 is a main reflector
  • 6 is a sub-reflector
  • 8 is a support mechanism for a sub-reflector
  • 5 is a primary radiator
  • 1 is a feeder
  • 2 is an azimuth axis
  • 3 is an elevation rotation axis
  • 13 and 16 are rotary joints
  • 10 is a rotary table.
  • FIG. 14 shows a reflector antenna device in which a Gregorian antenna is applied to the reflector antenna device of the third embodiment.
  • the antenna height is reduced depending on the design. There is an effect that can be reduced.
  • the effects of the reflector antenna device of the present invention are as follows.
  • the elevation axis is the azimuth axis of the reflector. Passing through a position substantially at the center of the direction and substantially at the center of the reflection mirror in a direction perpendicular to the elevation axis, the reflection mirror has a substantially rectangular opening long in the direction of the elevation axis, and However, the mirror surface is modified so as to receive substantially all of the supplied electromagnetic waves, so that the antenna height does not increase even when the reflecting mirror rotates about the elevation axis. Therefore, it is possible to provide a reflector antenna device that can be installed in a small space, has sufficient practicality, and performs scanning by rotating around two axes perpendicular to each other.
  • the reflector may include a sub-reflector that receives electromagnetic waves from the radiator, and a main reflector that reflects the electromagnetic waves reflected from the sub-reflector and directs the target toward a target. Since it can be installed, it can be installed not only in a small space, but also has sufficient practicality, and can be an efficient reflector antenna device that scans by rotating around two axes perpendicular to each other.
  • the reflector may be a reflector array having a plurality of reflector elements arranged with the elevation axes aligned, the antenna height can be further reduced, and a small space can be obtained. It is possible to provide a reflector antenna device that can be installed in a room, has sufficient practicality, and performs scanning by rotating around two axes perpendicular to each other.
  • Each of the reflector antennas of the main reflector has a substantially rectangular aperture shape, and in order to suppress grating lobes, each reflector antenna has a rectangular aperture when viewed from the mirror axis direction.
  • the mirror surface has been modified so that the electromagnetic field distribution at the aperture is a nearly uniform distribution. Therefore, the height of the antenna can be further reduced, the antenna can be installed in a small space, and there is sufficient practicality, and a highly efficient reflector that scans by rotating around two axes perpendicular to each other is provided.
  • An antenna device can be provided
  • the mirror surface is set so that the sub-reflector does not block when viewed from the mirror axis direction. Therefore, it is possible to provide a reflector antenna device that can be installed in a small space, has sufficient practicality, and does not cause blocking.
  • the reflector antenna is a Cassegrain antenna, it can be installed in a small space, and a highly efficient reflector antenna device having sufficient practicality can be provided.
  • the reflector antenna is a Gregorian antenna, it can be installed in a small space, and a highly efficient reflector antenna device having sufficient practicality can be provided.
  • the reflector antenna device according to the present invention is particularly useful as a reflector antenna device that performs scanning while rotating around two axes perpendicular to each other.

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

L'invention concerne une antenne à réflecteur pouvant être installée dans un espace réduit, tout en restant pratique, capable d'effectuer un balayage, tout en étant en rotation autour de deux axes orthogonaux, et comprenant un réflecteur Cassegrain et un mécanisme rotatif permettant de faire tourner ce réflecteur autour de l'axe azimutal et de l'axe de site. Le réflecteur présente une ouverture sensiblement rectangulaire et peut changer sa configuration de sorte que son axe de site passe sensiblement à travers le centre de la hauteur du réflecteur, une onde électromagnétique est produite et reçue, et sensiblement entièrement réfléchie, et la hauteur de l'antenne n'augmente pas, même lorsque le réflecteur tourne autour de l'axe de site. Le réflecteur peut être constitué d'un réseau d'une pluralité d'éléments de réflecteur.
PCT/JP2001/006236 2001-03-02 2001-07-18 Antenne a reflecteur WO2002071538A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/JP2002/001863 WO2002071540A1 (fr) 2001-03-02 2002-02-28 Antenne a reflecteur
DE60204946T DE60204946T2 (de) 2001-03-02 2002-02-28 Reflektorantenne
EP02701640A EP1365473B1 (fr) 2001-03-02 2002-02-28 Antenne a reflecteur
JP2002570345A JP3788784B2 (ja) 2001-03-02 2002-02-28 反射鏡アンテナ装置
US10/275,064 US6741216B2 (en) 2001-03-02 2002-02-28 Reflector antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-058811 2001-03-02
JP2001058811 2001-03-02

Publications (1)

Publication Number Publication Date
WO2002071538A1 true WO2002071538A1 (fr) 2002-09-12

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ID=18918477

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/006236 WO2002071538A1 (fr) 2001-03-02 2001-07-18 Antenne a reflecteur

Country Status (2)

Country Link
EP (1) EP1365473B1 (fr)
WO (1) WO2002071538A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5032799B1 (fr) * 1970-01-09 1975-10-24
JPS56165405A (en) * 1980-05-23 1981-12-19 Nec Corp Antenna having radiation beam of asymmetrical rotation
JPH0334607A (ja) * 1989-06-30 1991-02-14 Nec Corp 複反射鏡ビームアンテナ
JPH11168322A (ja) * 1997-12-04 1999-06-22 Nec Corp 低軌道衛星通信用アンテナ装置
JPH11186827A (ja) * 1997-12-22 1999-07-09 Nec Corp 低軌道衛星通信用アンテナ装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694147A (en) * 1946-08-21 1954-11-09 Bell Telephone Labor Inc Scanning antenna system
US5952980A (en) * 1997-09-17 1999-09-14 Bei Sensors & Motion Systems Company Low profile antenna positioning system
JPH11251824A (ja) * 1998-03-04 1999-09-17 Sumitomo Electric Ind Ltd 走査アンテナおよびそれを用いた無線通信システム
US6285338B1 (en) * 2000-01-28 2001-09-04 Motorola, Inc. Method and apparatus for eliminating keyhole problem of an azimuth-elevation gimbal antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5032799B1 (fr) * 1970-01-09 1975-10-24
JPS56165405A (en) * 1980-05-23 1981-12-19 Nec Corp Antenna having radiation beam of asymmetrical rotation
JPH0334607A (ja) * 1989-06-30 1991-02-14 Nec Corp 複反射鏡ビームアンテナ
JPH11168322A (ja) * 1997-12-04 1999-06-22 Nec Corp 低軌道衛星通信用アンテナ装置
JPH11186827A (ja) * 1997-12-22 1999-07-09 Nec Corp 低軌道衛星通信用アンテナ装置

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Publication number Publication date
EP1365473A1 (fr) 2003-11-26
EP1365473A4 (fr) 2004-12-15
EP1365473B1 (fr) 2005-07-06

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