EP1489688B1 - Alimentation pour une antenne a reflecteur - Google Patents
Alimentation pour une antenne a reflecteur Download PDFInfo
- Publication number
- EP1489688B1 EP1489688B1 EP04291540A EP04291540A EP1489688B1 EP 1489688 B1 EP1489688 B1 EP 1489688B1 EP 04291540 A EP04291540 A EP 04291540A EP 04291540 A EP04291540 A EP 04291540A EP 1489688 B1 EP1489688 B1 EP 1489688B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diameter
- antenna
- waveguide
- dielectric body
- frustoconical
- 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.)
- Expired - Lifetime
Links
- 230000004323 axial length Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 208000031968 Cadaver Diseases 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000037213 diet Effects 0.000 description 2
- 235000005911 diet Nutrition 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- 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
Definitions
- the invention lies in the field of reflector antenna power devices. It also concerns an antenna equipped with such food.
- the patent application EP 1 221 740 described in reference to Figure 1 an antenna 1 having a main reflector 10 and a power supply 12.
- the antenna 1 has a symmetry of revolution around an axis OO 'of the antenna.
- Figure 1 represents a schematic half section according to a plane containing the axis of symmetry OO '.
- Antenna 1 includes a main reflector 10 having a concavity, having for example the shape of a paraboloid of revolution around the axis OO 'so as to present a directivity marked in the direction of the axis OO '.
- a device 12 power supply antenna is located on along the axis OO 'of the antenna 1 in the part of the reflector having the concavity.
- This device 12 feeding is shown in more detail in Figure 2. It includes the along axis OO 'in a direction from the center reflector 10, and located inside the concavity, a waveguide portion 20. With regard to concerning diet 12, it is considered that a first end 21 of this waveguide 20 is constituted by the place where this waveguide 20 crosses the main reflector 10. This first end is located in the center of the main reflector 10. Second end 22 of the waveguide 20 is located face to a sub-reflector 24. The subreflector 24 is secant to the axis OO '. It has a form of revolution around of the axis OO '.
- the sub-reflector 24 reflects the waves electromagnetic from the main reflector 10 to the waveguide 20.
- the sub reflector 24 reflects the electromagnetic waves from the waveguide 20 to the reflector 10.
- part of the power supply 12 is formed by a dielectric body 23 joining the second end 22 of the waveguide 20 and the sub reflector 24. The confinement of the waves electromagnetic between the second end 22 of the waveguide 20 and the subreflector 24 provides a better electromagnetic coupling between the sub reflector 24 and the main reflector 10.
- the dielectric body 23 has a portion 31 outside the waveguide 20 and a part 30 inside this waveguide. Due to the difference dimension between the diameter of the subreflector 24 and the diameter of the waveguide 20, an outer surface 29 of the dielectric body 23 has a frustoconical shape having two ends one of small diameter and the other of large diameter. The small end diameter is connected to the second end 22 of waveguide 20. The small diameter is substantially equal to the diameter of the waveguide 20. The large diameter is substantially equal to the outside diameter of the sub reflector 24.
- the body dielectric 23 is provided with grooves or wrinkles presenting a symmetry of revolution around the axis OO '.
- the frustoconical surface 29 has bumps 25 and hollow 28. These wrinkles prevent the waves electromagnetic spread along the surface of the subreflector 22, that the electric field of these waves be normal or tangential to this surface.
- the directivity diagram of the antenna 1 has a greater directivity in the direction of a main lobe of the antenna, and therefore less importance of dispersion in the secondary lobes.
- Subreflector 24 is generally constituted by a metal deposit made on a body surface dielectric 23.
- the concave shaped volume delimited by the metallic deposit constituting the subreflector 24 is generally filled by a dielectric.
- the part 30 of the dielectric body internal to the waveguide has it even at the end 22 a part 27 whose diameter is equal to the inside diameter of the waveguide 20. That part 27 is extended in the direction of the first end 21 by a second portion 26 of which the diameter decreases with one or more jumps successive.
- This structural feature improves the electromagnetic coupling between the waveguide 20 and the dielectric body 23. Thus, especially the rate of losses by reflection.
- phase center is defined as the center of a spherical wavefront. In the perfect case this center is a point. In this case the phase efficiency is equal to 1. In practice the center is poorly defined and is more like a small volume. In this case the phase efficiency is less than 1.
- the phase efficiency of a radiation pattern can be calculated by the formula PE1 below.
- the present invention aims to further improve the coupling between the waveguide 20 and the main reflector 10, in particular by a decrease in the rate of reflection losses.
- the maximum admissible value of the reflection rate bandwidth of an antenna using power according to the invention is broader.
- It also aims to give the antenna a better phase efficiency, which has the effect of improving the diagram of antenna radiation and so a higher proportion large of the total energy scattered is found in his main lobe.
- the invention aims to simplify the shape of the dielectric body, and therefore its manufacture.
- the use of the invention allows efficiency equal of the antenna to keep a small size to the under reflector made by a metal deposit on one side back of the dielectric.
- the value of small diameter of the frustoconical portion is greater to the value of the diameter of the cylindrical part outer dielectric body.
- a junction surface of the body dielectric between the outer cylindrical part and the small diameter end of the frustoconical part said dielectric body is constituted by a circular ring plane perpendicular to the axis OO ', delimited by two concentric circles centered on the axis OO ', one having a value of diameter equal to diameter of the outer cylindrical part, the value the diameter of the other being equal to the value of the small diameter of the frustoconical lateral surface.
- the axial length of the outer cylindrical part of the dielectric body is between ⁇ / 4 and ⁇ / 2, ⁇ denoting the length wave in free space of an electromagnetic wave having the median frequency of the frequency band on which antenna is tuned.
- the value of the dielectric constant ⁇ r of the material constituting the dielectric body is close to 2.5
- the value of the apex angle ⁇ of the frustoconical surface of the dielectric body is close to 30 °.
- an antenna 1 with a power supply 12 according to the invention comprises a main reflector 10 having a concavity, having for example the shape of a paraboloid of revolution around the axis OO 'of way to present a pronounced directivity in the direction of the axis OO '.
- the power device 12 of antenna 1 is located along the axis OO 'of the antenna 1 in the part of the reflector presenting the concavity. It presents as the whole antenna a symmetry of revolution around the axis OO '.
- power supply device 12 comprises along the axis OO 'in a direction from the center of the reflector 10, and located inside the concavity, a guide part 20.
- a first end 21 of this guide of wave 20 is constituted by the place where this guide waveform 20 passes through the main reflector 10. This first end is located in the center of the reflector main 10.
- a second end 22 of the guide wave 20 is located in front of a sub-reflector 24.
- the subreflector 24 is secant to the axis OO '. It has a form of revolution around of the axis OO '. It has a convexity that faces the concavity of the main reflector 10.
- the diameter exterior of the subreflector 24 is greater than diameter of the waveguide 20.
- a part of the diet 12 is constituted by a body dielectric 23 joining the second end 22 of the waveguide 20 and the subreflector 24.
- the invention differs from the prior art basically by the shape of a part outer 31, of this dielectric body 23. It will be seen also that the form according to the invention of the body dielectric 23 allows equal efficiency to reduce the dimensions of the subreflector 24.
- the dielectric body 23 is formed of two parts adjacent to each other, a part 30 inside the waveguide 20 and the part 31 outside the waveguide 20.
- This part 31 outer has a shape portion frustoconical 35 having an outer side surface 29 of frustoconical shape having two ends 32, 33, a large diameter end 32 and one end 33 of small diameter.
- the outer side surface 29 of the frustoconical portion 35 is smooth, that is to say that unlike the prior art, it does not include gorges or wrinkles.
- the small diameter end 33 of the outer lateral surface 29 of the frustoconical portion 35 is connected to a cylindrical portion 34 of the dielectric body 23 also outside the waveguide 20.
- This cylindrical portion 34 is like the rest of the dielectric body 23 of revolution around the axis 00 '.
- the cylindrical portion 34 has a first end 22 which coincides with the second end 22 of the waveguide 20 and a second end 37 where the cylindrical portion 34 is connected to the frustoconical shape 35 at its small diameter end 33.
- the small diameter of the frustoconical portion 35 is greater than the diameter of the cylindrical portion 34.
- the diameter of the cylindrical portion 34 is between 1.1 and 1.3 times the inner diameter of the pipe waveguide.
- the large diameter of the frustoconical shape 35 is substantially equal to the external diameter of the subreflector 24.
- Part 30 of the dielectric body 23 internal waveguide 20 itself at the level of the end 22 a portion 27 whose diameter is equal to the inside diameter of the waveguide 20.
- This part 27 is extended in the direction of the first end 21 by a second portion 26 whose diameter goes down by one or more jumps successive.
- This structural feature improves the electromagnetic coupling between the waveguide 20 and the dielectric body 23. Thus, especially the rate of losses by reflection.
- part outer cylindrical 34 stands as a jump in additional diameter extending outwards the successive jumps of diameter of the part interior 30.
- the value of the small diameter of the tapered portion 35 is greater than the value of the diameter of the outer cylindrical portion 34 of the dielectric body 23. This is a jump additional exterior.
- a surface 36 of junction of the dielectric body 23 between the part cylindrical 34 outer and the 33 end of small diameter of the frustoconical portion 35 is constituted by a plane circular ring 36 perpendicular to the axis OO ', delimited by two concentric circles centered on the axis OO ', one having a value of diameter equal to the diameter of the cylindrical portion 34 outside, the diameter of the other being equal to the value of the small diameter of the surface Lateral truncated cone 29.
- the joining surface between the second end 37 of the part cylindrical 34 and the frustoconical portion 35 could be constituted for example by a frustoconical surface joining the end 37 of the cylindrical portion 34 and the end 33 of the frustoconical surface 29.
- the top of the frustoconical surface of junction would be in this case closer to the subreflector 24 than the end 37.
- the axial length of the cylindrical part 34 outer body dielectric 23 is between ⁇ / 4 and ⁇ / 2, ⁇ designating the wavelength in free space of the value of the electromagnetic wave having a frequency median of a frequency band over which the antenna 1 is granted.
- the inner diameter of the waveguide is it of 0.65 ⁇ approximately. So in general the length axial of the outer cylindrical portion 34 of the body dielectric 23 is between d / 1.3 and d / 2.6, d designating the inside diameter of the waveguide.
- the value of the dielectric constant ⁇ r of the material constituting the dielectric body 23 is close to 2.5.
- the value of the vertex angle ⁇ of the frustoconical surface 29 of the dielectric body is close to 30 °.
- Subreflector 24 is as in the prior art deposited on one face of the dielectric body 23 secant axis OO '. It has a polynomial form. This means that the profile of the metallized surface of the subreflector follows a polynomial curve, generally at the maximum of order 3 according to the formula a + bX + cX 2 + dX 3 , a, b, c, d, which can 0. Comparisons between parabolic directional antennas 0.65 meters in diameter including a power supply of the type described in connection with Figure 2, and parabolic directional antennas of 0.65 meters in diameter made according to the example of realization in connection with Figure 3 will now be performed.
- Figures 4A and 4B show each a curve representing according to the value of the frequency on the abscissa, the value of the loss by reflection for an antenna tuned out of 15 gigahertz, according to the prior art in FIG. 4A, and for an antenna according to the present invention Figure 4B.
- Reflective loss rate measurements are performed for frequencies from 14 to 16 gigahertz.
- Figures 5A and 5B show each a curve representing according to the value of the frequency on the abscissa, the value of the loss by reflection for an antenna tuned on 19 gigahertz, according to the prior art in FIG. 5A, and for an antenna according to the present invention FIG. 5B,
- Reflective loss rate measurements are performed for frequencies ranging from 17 to 20 gigahertz.
- the band frequency of the antenna comprising the power supply according to the invention is enlarged since one goes from one band of 1.15 Ghz ranging from 14.2 to 15.35 Ghz at a 2 Ghz band ranging from 14 to 16 Ghz for antennas tuned to 15 gigahertz and a band of 2 Ghz from 17.7 to 19.7 Ghz at a band of 3 Ghz ranging from 17 at 20 Ghz for antennas tuned to 19 gigahertz.
- FIG. 6A represents for an antenna tuned on 15 gigahertz, two curves a and b each representing, depending on the value of the frequency on the abscissa, the value of the gain directional range on the y-axis, the curve has dotted for a power supply according to the prior art and the curve b for a supply according to the present invention.
- FIG. 6B shows for an antenna tuned on 19 gigahertz, two curves a and b each representing, depending on the value of the frequency on the abscissa, the value of the gain directional range on the y-axis, the curve has dotted for a power supply according to the prior art and the curve b for a supply according to the present invention.
Landscapes
- Aerials With Secondary Devices (AREA)
- Waveguide Aerials (AREA)
Description
- un guide d'onde ayant un diamètre intérieur dpipe, une première et une seconde extrémité,
- un corps diélectrique ayant une partie intérieure au guide d'onde et une partie extérieure au guide d'onde, cette partie extérieure comportant une partie de forme tronconique ayant une surface latérale extérieure de forme tronconique ayant deux extrémités, une extrémité de grand diamètre et une extrémité de petit diamètre,
- un sous réflecteur placé du côté de l'extrémité de grand diamètre de ladite forme tronconique,
- la figure 1 déjà décrite représente une demi coupe schématique selon un plan passant par un axe de symétrie d'une antenne comportant un réflecteur principal et une alimentation. Cette figure destinée à montrer les positions relatives du réflecteur principal et de l'alimentation se rapporte aussi bien à l'art antérieur qu'à la présente invention,
- la figure 2 déjà décrite montre une coupe schématique selon un plan passant par l'axe de symétrie de l'antenne, d'une alimentation d'antenne selon l'art antérieur,
- la figure 3 montre une coupe schématique selon un plan passant par l'axe de symétrie de l'antenne, d'une alimentation d'antenne selon la présente invention,
- les figures 4A et 4B représentent chacune une courbe représentant en fonction de la valeur de la fréquence portée en abscisse, la valeur du taux de perte par réflexion pour une antenne accordée sur 15 gigahertz, selon l'art antérieur sur la figure 4A, et pour une antenne selon la présente invention figure 4B,
- les figures 5A et 5B représentent chacune une courbe représentant en fonction de la valeur de la fréquence portée en abscisse, la valeur du taux de perte par réflexion pour une antenne accordée sur 19 gigahertz, selon l'art antérieur sur la figure 5A, et pour une antenne selon la présente invention figure 5B,
- la figure 6A représente pour une antenne accordée sur 15 gigahertz, deux courbes représentant chacune, en fonction de la valeur de la fréquence portée en abscisse, la valeur du gain directionnel portée en ordonnée, l'une des deux courbes pour une alimentation selon l'art antérieur et l'autre pour une alimentation selon la présente invention,
- la figure 6B représente pour une antenne accordée sur 19 gigahertz, deux courbes représentant chacune, en fonction de la valeur de la fréquence portée en abscisse, la valeur du gain directionnel portée en ordonnée, l'une des deux courbes pour une alimentation selon l'art antérieur et l'autre pour une alimentation selon la présente invention.
Claims (7)
- Alimentation (12) d'antenne (1) comportant alignés et centrés sur un axe OO',un guide d'onde (20) ayant un diamètre intérieur dpipe, une première (21) et une seconde (22) extrémité,
un corps diélectrique (23) ayant une partie (27) intérieure au guide d'onde (20) et une partie (31) extérieure au guide d'onde (20), cette partie extérieure (31) comportant une partie de forme tronconique (35) ayant une surface latérale extérieure (29) de forme tronconique ayant deux extrémités (32, 33), une extrémité de grand diamètre (32) et une extrémité (33) de petit diamètre,un sous réflecteur (24) placé du côté de l'extrémité (33) de grand diamètre de ladite forme tronconique (35), - Alimentation (12) d'antenne (1) selon la revendication 1, caractérisé en ce que la valeur du petit diamètre de la partie tronconique (35) est supérieure à la valeur du diamètre de la partie cylindrique (34) extérieure du corps diélectrique (23).
- Alimentation (12) d'antenne (1) selon la revendication 2, caractérisé en ce que une surface de jonction (36) du corps diélectrique entre la partie cylindrique (34) extérieure et l'extrémité (33) de petit diamètre de la partie tronconique (35) dudit corps diélectrique (23), est constituée par une couronne (36) circulaire plane perpendiculaire à l'axe OO', délimitée par deux cercles concentriques centrés sur l'axe OO', l'un ayant une valeur de diamètre égale au diamètre de la partie cylindrique (34) extérieure, la valeur du diamètre de l'autre étant égale à la valeur du petit diamètre de la surface latérale tronconique (29).
- Alimentation (12) d'antenne (1) selon l'une des revendications 1 à 3, caractérisée en ce que la longueur axiale de la partie cylindrique (34) extérieure du corps diélectrique (23) est comprise entre λ/4 et λ/2, λ désignant la longueur d'onde en espace libre de la valeur de l'onde électromagnétique ayant une fréquence médiane d'une bande de fréquence sur laquelle l'antenne (1) est accordée.
- Alimentation (12) d'antenne (1) selon l'une des revendications 1 à 4, caractérisée en ce que la valeur de la constante diélectrique εr du matériau constituant le corps diélectrique (23) est voisine de 2,5, la valeur de l'angle au sommet de la surface du corps diélectrique est voisine de 30°.
- Alimentation (12) d'antenne (1) selon l'une des revendications 1 à 5, caractérisée en ce que la valeur du diamètre de la partie (34) cylindrique extérieure est comprise entre 1,1 et 1,3 fois la valeur du diamètre intérieur dpipe du guide d'ondes (20).
- Antenne directive équipée d'un réflecteur caractérisée en ce qu'elle est équipée d'une alimentation selon l'une des revendications précédentes.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0350224 | 2003-06-17 | ||
FR0350224A FR2856525B1 (fr) | 2003-06-17 | 2003-06-17 | Alimentation pour une antenne a reflecteur. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1489688A1 EP1489688A1 (fr) | 2004-12-22 |
EP1489688B1 true EP1489688B1 (fr) | 2005-09-07 |
Family
ID=33396879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04291540A Expired - Lifetime EP1489688B1 (fr) | 2003-06-17 | 2004-06-16 | Alimentation pour une antenne a reflecteur |
Country Status (6)
Country | Link |
---|---|
US (1) | US6995727B2 (fr) |
EP (1) | EP1489688B1 (fr) |
CN (1) | CN100536230C (fr) |
AT (1) | ATE304228T1 (fr) |
DE (1) | DE602004000083T2 (fr) |
FR (1) | FR2856525B1 (fr) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7907097B2 (en) * | 2007-07-17 | 2011-03-15 | Andrew Llc | Self-supporting unitary feed assembly |
KR100991667B1 (ko) * | 2007-09-12 | 2010-11-04 | 에이앤피테크놀로지 주식회사 | 위성신호 수신장치 및 위성신호 수신방법 |
FR2926680B1 (fr) * | 2008-01-18 | 2010-02-12 | Alcatel Lucent | Reflecteur-secondaire d'une antenne a double reflecteur |
CN101252226B (zh) * | 2008-04-03 | 2012-07-04 | 西安电子科技大学 | 反射面天线馈源的定位方法 |
US20110081192A1 (en) * | 2009-10-02 | 2011-04-07 | Andrew Llc | Cone to Boom Interconnection |
CN101976766B (zh) * | 2010-09-07 | 2014-06-11 | 京信通信系统(中国)有限公司 | 超高性能微波天线及其馈源组件 |
US20130057444A1 (en) | 2011-09-01 | 2013-03-07 | Andrew Llc | Controlled illumination dielectric cone radiator for reflector antenna |
US8581795B2 (en) | 2011-09-01 | 2013-11-12 | Andrew Llc | Low sidelobe reflector antenna |
US9948010B2 (en) | 2011-09-01 | 2018-04-17 | Commscope Technologies Llc | Method for dish reflector illumination via sub-reflector assembly with dielectric radiator portion |
US9019164B2 (en) | 2011-09-12 | 2015-04-28 | Andrew Llc | Low sidelobe reflector antenna with shield |
CN102570050B (zh) * | 2011-12-19 | 2014-04-09 | 西安普天天线有限公司 | 长焦后馈超高性能微波抛物面天线 |
US9698490B2 (en) * | 2012-04-17 | 2017-07-04 | Commscope Technologies Llc | Injection moldable cone radiator sub-reflector assembly |
US9105981B2 (en) | 2012-04-17 | 2015-08-11 | Commscope Technologies Llc | Dielectric lens cone radiator sub-reflector assembly |
US9831563B2 (en) | 2013-08-12 | 2017-11-28 | Commscope Technologies Llc | Sub-reflector assembly with extended dielectric radiator |
JP6198647B2 (ja) * | 2014-03-19 | 2017-09-20 | 三菱電機株式会社 | アンテナ装置 |
WO2019216935A2 (fr) | 2017-08-22 | 2019-11-14 | Commscope Technologies Llc | Miroirs paraboliques qui supportent des diagrammes de rayonnement de lobes secondaires faibles |
EP3561956B1 (fr) * | 2018-04-27 | 2021-09-22 | Nokia Shanghai Bell Co., Ltd | Système d'antenne radiofréquence multibande (rf) |
US10938153B2 (en) * | 2018-11-06 | 2021-03-02 | Optim Microwave Inc. | Waveguide quick-connect mechanism, waveguide window/seal, and portable antenna |
US11594822B2 (en) | 2020-02-19 | 2023-02-28 | Commscope Technologies Llc | Parabolic reflector antennas with improved cylindrically-shaped shields |
CN117410726B (zh) * | 2023-11-06 | 2024-06-25 | 安徽大学 | 一种应用于低剖面反射、透射阵的反射式环焦馈源 |
CN118073855B (zh) * | 2024-04-18 | 2024-07-19 | 广东盛路通信科技股份有限公司 | 一种溅散板馈源、宽频微波天线及其频带扩展方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4673947A (en) * | 1984-07-02 | 1987-06-16 | The Marconi Company Limited | Cassegrain aerial system |
GB2161324B (en) * | 1984-07-02 | 1988-01-06 | Marconi Co Ltd | Cassegrain aerial system |
US4673945A (en) * | 1984-09-24 | 1987-06-16 | Alpha Industries, Inc. | Backfire antenna feeding |
NO862192D0 (no) * | 1986-06-03 | 1986-06-03 | Sintef | Reflektorantenne med selvbaerende mateelement. |
US6020859A (en) * | 1996-09-26 | 2000-02-01 | Kildal; Per-Simon | Reflector antenna with a self-supported feed |
EP1221740B1 (fr) * | 2000-12-27 | 2006-05-03 | Marconi Communications GmbH | Alimentation de type Cassegrain pour une antenne |
US6724349B1 (en) * | 2002-11-12 | 2004-04-20 | L-3 Communications Corporation | Splashplate antenna system with improved waveguide and splashplate (sub-reflector) designs |
US6919855B2 (en) * | 2003-09-18 | 2005-07-19 | Andrew Corporation | Tuned perturbation cone feed for reflector antenna |
-
2003
- 2003-06-17 FR FR0350224A patent/FR2856525B1/fr not_active Expired - Fee Related
-
2004
- 2004-06-16 EP EP04291540A patent/EP1489688B1/fr not_active Expired - Lifetime
- 2004-06-16 AT AT04291540T patent/ATE304228T1/de not_active IP Right Cessation
- 2004-06-16 DE DE602004000083T patent/DE602004000083T2/de not_active Expired - Lifetime
- 2004-06-16 US US10/867,751 patent/US6995727B2/en not_active Expired - Lifetime
- 2004-06-17 CN CNB2004100483287A patent/CN100536230C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN100536230C (zh) | 2009-09-02 |
DE602004000083D1 (de) | 2005-10-13 |
US20050007288A1 (en) | 2005-01-13 |
EP1489688A1 (fr) | 2004-12-22 |
US6995727B2 (en) | 2006-02-07 |
CN1574461A (zh) | 2005-02-02 |
ATE304228T1 (de) | 2005-09-15 |
FR2856525A1 (fr) | 2004-12-24 |
FR2856525B1 (fr) | 2005-09-02 |
DE602004000083T2 (de) | 2006-05-18 |
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