GB2249668A - Antenna - Google Patents
Antenna Download PDFInfo
- Publication number
- GB2249668A GB2249668A GB9024125A GB9024125A GB2249668A GB 2249668 A GB2249668 A GB 2249668A GB 9024125 A GB9024125 A GB 9024125A GB 9024125 A GB9024125 A GB 9024125A GB 2249668 A GB2249668 A GB 2249668A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arrangement
- reflector
- patch antenna
- sub
- antenna
- 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.)
- Withdrawn
Links
- 239000003989 dielectric material Substances 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 9
- 239000002184 metal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
- H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Waveguide Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
An antenna arrangement includes a main reflector 1 and a sub-reflector 2 which directs received radiation onto a food 3. The sub-reflector 2 also supports a patch antenna 4 which is arranged to receive radiation at a different frequency range than that at which the feed 3 operates. In another arrangement (not shown) the patch antenna 4 comprises an array of antenna elements. <IMAGE>
Description
Antenna Arranaements This invention relates to antenna arrangements and more particularly to arrangements which are suitable for receiving and/or transmitting radiation over a relatively wide frequency range.
In one known type of antenna arrangement, a main reflector is combined with a sub-reflector in a Cassegrain configuration with a feed located at the centre of the main reflector. In such an arrangement, the feed is typically in the form of a tapered horn connected to a waveguide along which energy propagates. Received radiation is focused via the main reflector and the sub-reflector onto the feed, and energy to be transmitted follows the reverse path.
The arrangement operates satisfactorily over a relatively narrow bandwidth as the constraints placed on the feed configuration for efficient operation can be readily met. However, if a wider range operating frequencies is required, the design and efficiency of the feed must be comprised in order to accommodate them.
The present invention arose from an attempt to provide an antenna arrangement which is suitable for operation over a relatively wide bandwidth.
According to the invention, there is provided an antenna arrangement comprising a main reflector and a sub-reflector arranged to form a transmission/reception path to a feed for operating at one frequency, or range of frequencies, and a patch antenna supported by the sub-reflector for operating another frequency or range of frequencies.
A patch antenna is a type of antenna which comprises a metallic substrate supporting a dielectric layer on which is mounted a metal plate at which radiation is transmitted and/or received. This form of antenna is also sometimes referred to as a "microstrip" patch antenna because of the similarities in its operation to microstrip transmission lines.
By employing a patch antenna on the sub-reflector, a relatively broad frequency range may be obtained for the antenna arrangement without requiring extensive re-design of the feed or compromising on the ranges which may be used as additional frequency capability is provided by the patch antenna.
The patch antenna may be designed to be responsive to a lower range of frequencies than the feed but it could be arranged to operate at higher frequencies.
In one embodiment of the invention, the dielectric layer of the patch antenna is inset into the sub-reflector so that the metal plate of the patch antenna has the same geometry as the sub-reflector's reflective surface and is separated therefrom by dielectric material . In another embodiment of the invention the dielectric material and the metal plate of the patch antenna are proud of the sub-reflector surface.
In one advantageous embodiment of the invention, the patch antenna is located subtantially at the centre of the sub-reflector and preferably the conducting plate of the patch antenna is circular. However, the patch antenna could be mounted on other parts of the sub-reflector.
The reflector and sub-reflector may be in a Cassegrain configuration but other arrangements may be used, for example there may be more than one sub-reflector.
The sub-reflector may present a hyperbolic reflective surface but it may be a more complex shape having perturbations in its configuration to compensate for the presence of the patch antenna and minimise its effect on the performance of the antenna arrangement for the frequency or frequency range with which the feed is concerned.
The feed may be located substantially at the centre of the main reflector but it may be more convenient for some applications to arrange that it is offset from the centre.
In some embodiments of the invention, the patch antenna comprises an array of antenna elements. These elements may be associated with individual dielectric regions or could be formed on a common dielectric layer.
Some ways in which the invention may be performed are now described by way of example with reference to the accompanying drawings in which:
Figure 1 schematically illustrates an antenna arrangement in accordance with the invention;
Figure 2 illustrates part of another antenna arrangement in accordance with the invention; and
Figure 3 schematically illustrates a further antenna arrangement in accordance with the invention.
With reference to Figure 1, an antenna arrangement includes a main reflector 1 and a sub-reflector 2 which are configured to direct incoming radiation onto a waveguide feed 3 located substantially at the centre of the main reflector 1. A patch antenna 4 is located at the centre of the sub-reflector 2, and comprises a conductive circular plate 5 located on a dielectric layer 6 supported by the sub-reflector 2. A co-axial line 7 is connected to the patch antenna 4, the inner conductor being connected to the metal plate 5 and the outer conductor to the metal sub-reflector 2.
Microwave radiation received over one frequency range is focused by the main reflector 1 and sub-reflector 2 onto the feed 3. Radiation at lower frequencies is received at the patch antenna 4 and transmitted along the coaxial line 7.
Although this arrangement has been described as a receiver, it may also be used to transmit radiation via both the feed 3 and the patch antenna 4.
With reference to Figure 2, in another embodiment of the invention, a patch antenna 8 is mounted at the centre of a sub-reflector 9 which is included in an arrangement similar to that shown in Figure 1. However, in this arrangement, the dielectric material 10 of the patch antenna is set into the sub-reflector surface so that the metal plate 11 has substantially the same geometry as the sub-reflector surface, being spaced from it by the dielectric material 10 surrounding it.
Figure 3 illustrates another embodiment of the invention in which the patch antenna 12 mounted on a sub-reflector 13 comprises a plurality of metal plates 14 disposed over a dielectric layer 15.
Claims (11)
1. An antenna arrangement comprising a main reflector and a sub-reflector arranged to form a transmission/reception path to a feed for operating at one frequency, or range of frequencies, and a patch antenna supported by the sub-reflector for operating at another frequency or range of frequencies.
2. An arrangement as claimed in claim 1 wherein the patch antenna operates at a lower frequency than the feed.
3. An arrangement as claimed in claim 1 wherein the patch antenna operates at a higher frequency than the feed.
4. An arrangement as claimed in claim 1, 2 or 3 wherein the patch antenna comprises a conductive plate mounted on a dielectric layer which is supported by a conductive member.
5. An arrangement as claimed in claim 4 wherein the connection to the patch antenna is made via a coaxial line in which the inner conductor is connected to the conductive plate and the outer conductor to the conductive member.
6. An arrangement as claimed in any preceding claim wherein the patch antenna is inset in the sub-reflector
7. An arrangement as claimed in any of claims 1 to 6 wherein the patch antenna is substantially proud of the sub-reflector surface.
8. An arrangement as claimed in any preceding claim wherein the patch antenna is substantially circular.
9. An arrangement as claimed in any preceding claim wherein the patch antenna is located at substantially the centre of the sub-reflector.
10. An arrangement as claimed in any preceding claim wherein the patch antenna comprises an array of conductive plates supported by dielectric material.
11. An antenna arrangement substantially as illustrated in and described with reference to Figure 1, 2 or 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9024125A GB2249668A (en) | 1990-11-06 | 1990-11-06 | Antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9024125A GB2249668A (en) | 1990-11-06 | 1990-11-06 | Antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9024125D0 GB9024125D0 (en) | 1990-12-19 |
| GB2249668A true GB2249668A (en) | 1992-05-13 |
Family
ID=10684954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9024125A Withdrawn GB2249668A (en) | 1990-11-06 | 1990-11-06 | Antenna |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2249668A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5483663A (en) * | 1994-04-05 | 1996-01-09 | Diversified Communication Engineering, Inc. | System for providing local originating signals with direct broadcast satellite television signals |
| US5761605A (en) * | 1996-10-11 | 1998-06-02 | Northpoint Technology, Ltd. | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals |
| US5912645A (en) * | 1996-03-19 | 1999-06-15 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Industry Through The Communications Research Centre | Array feed for axially symmetric and offset reflectors |
| WO2003032433A1 (en) * | 2001-10-09 | 2003-04-17 | The Boeing Company | A monopulse beam pointing system for a satellite communication system |
| EP4513682A1 (en) * | 2023-08-21 | 2025-02-26 | Eagle Technology, LLC | Antenna with dual-function antenna structure and associated methods |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0195608A (en) * | 1987-10-08 | 1989-04-13 | Nec Corp | Dual reflecting mirror antenna |
-
1990
- 1990-11-06 GB GB9024125A patent/GB2249668A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0195608A (en) * | 1987-10-08 | 1989-04-13 | Nec Corp | Dual reflecting mirror antenna |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5483663A (en) * | 1994-04-05 | 1996-01-09 | Diversified Communication Engineering, Inc. | System for providing local originating signals with direct broadcast satellite television signals |
| US5912645A (en) * | 1996-03-19 | 1999-06-15 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Industry Through The Communications Research Centre | Array feed for axially symmetric and offset reflectors |
| US5761605A (en) * | 1996-10-11 | 1998-06-02 | Northpoint Technology, Ltd. | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals |
| US6208834B1 (en) | 1996-10-11 | 2001-03-27 | Northpoint Technology, Ltd. | Apparatus and method for facilitating terrestrial transmissions at frequencies also used for satellite transmissions to a common geographic area |
| US7853197B2 (en) | 1996-10-11 | 2010-12-14 | Carmen Tawil | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals |
| WO2003032433A1 (en) * | 2001-10-09 | 2003-04-17 | The Boeing Company | A monopulse beam pointing system for a satellite communication system |
| EP4513682A1 (en) * | 2023-08-21 | 2025-02-26 | Eagle Technology, LLC | Antenna with dual-function antenna structure and associated methods |
| US12555920B2 (en) | 2023-08-21 | 2026-02-17 | Eagle Technology, Llc | Antenna with dual-function antenna structure and associated methods |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9024125D0 (en) | 1990-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |