WO2011014919A1 - A multi-band antenna - Google Patents
A multi-band antenna Download PDFInfo
- Publication number
- WO2011014919A1 WO2011014919A1 PCT/AU2010/000987 AU2010000987W WO2011014919A1 WO 2011014919 A1 WO2011014919 A1 WO 2011014919A1 AU 2010000987 W AU2010000987 W AU 2010000987W WO 2011014919 A1 WO2011014919 A1 WO 2011014919A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reflector
- feed
- sub
- antenna
- prime focus
- Prior art date
Links
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
-
- 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
- H01Q19/12—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 wherein the surfaces are concave
- H01Q19/13—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 wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
-
- 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
Definitions
- the invention relates to an antenna suitable for satellite communications .
- the invention provides an antenna comprising:
- the prime focus feed and the sub-reflector mounted for movement relative to the primary reflector between a first configuration in which the prime focus feed and the primary reflector define a first signal path and a second configuration in which the primary reflector, the sub- reflector and the dual-reflector feed define a second signal path.
- the prime focus feed and sub-reflector are mounted together for rotational movement around a pivot point between the first and second configurations .
- the prime focus feed and sub-reflector are mounted to the primary reflector.
- the dual-reflector feed is co-located with the primary reflector.
- the dual-reflector feed is off-set from the primary reflector.
- the sub-reflector is mounted for independent movement relative to the prime focus feed.
- the prime focus feed and sub-reflector are mounted for rotational movement around a pivot point between the first and second configurations .
- the sub-reflector is mounted for translational movement relative to the prime focus feed.
- Figures IA and IB show a Gregorian-type antenna in first and second configurations
- Figures 2A and 2B show a Cassegrain-type antenna in first and second configurations
- Figures 3A and 3B show an offset Cassegrain-type antenna in first and second configurations
- Figures 4A and 4B show an offset Gregorian-type antenna in first and second configurations
- Figure 5 shows a detail of the Cassegrain-type antenna of Figure 2.
- the embodiment relates to a reconfigurable multi-band antenna that can operate in one set of frequency bands with a prime focus feed and non-simultaneously at another set of frequency bands with a dual reflector arrangement incorporating a sub-reflector and dual-reflector feed.
- the feed is a feed horn but the feed could also be a patch, crossed dipole, phase array etc and could be different for each band.
- a patch for L- band and a horn for X-band This antenna arrangement may provide simultaneous coverage at multiple frequency bands but not at all band sets at once .
- This arrangement is based on the realisation that while it is desirable to be able to operate at different frequency bands on different satellites , simultaneous operation may not be required for all bands.
- antennas of the embodiment have the advantage of reducing the space required to mount the relatively large antennas required for satellite
- the embodiment provides an antenna system that provides a prime focus feed, which will generally be used for lower frequency satellite systems such as Inmarsat and a sub- reflector that can be mechanically switched in place of the prime focus feed to provide a dual reflector feed configuration which will be used, for example, for the higher frequency commercial and military satellites .
- Both feeds may operate in either simplex mode (receive Only) or full duplex mode (transmit and receive) .
- the dual-reflector feed In one mode of operation, the dual-reflector feed
- the prime focus feed is behind the sub-reflector and is not illuminated by the signal from the dual-reflector feed.
- the prime focus feed is a low frequency feed, for example for L-band or C-band whereas the dual-reflector feed is a high frequency feed such as for X-band, Ku-band, K-band, Ka-band etc.
- a line marked Z with a subscript corresponding to the figure number shows an exemplary single signal path.
- the signal path can be reversed for the feed to receive a signal rather than transmit a signal .
- a Gregorian-type antenna 100 is shown in a first configuration which corresponds to a high frequency mode of operation where a signal is emitted from the high frequency feed (120) which provides the dual- reflector feed to the sub-reflector 130 where it is reflected to the primary reflector 110 and transmitted outwardly .
- a Cassegrain-type antenna 200 is shown in a first configuration.
- the antenna 200 is operating in a high frequency mode where the high frequency feed 210 transmits a signal onto the sub-reflector 230 which reflects it off the primary reflector 210 for transmission.
- Figure 2B shows a second configuration .
- the low frequency feed 240 and the Cassegrain-type sub-reflector 230 have been rotated around in the axis indicated by arrow X.
- FIG. 5 shows one implementation of the antenna 200 of Figure 2.
- the low frequency feed 240 and the sub-reflector 230 are parts of a multi-frequency structure 505 mounted by mount 580 for rotational movement with a rotatable drive shaft 530 mounted between bearing 540 and stepper motor 520, and driven by the stepper motor 520 which operates under control of a control circuit mounted within equipment housing 550 to be driven between two positions 180 degrees apart.
- Bearing 540 and stepper motor 520 are mounted respectively to a set of struts 510A, 510B
- a pair of linear actuators 560A, 560B are driven by linear motors to extend or retract the sub- reflector to a desired position.
- the control circuit can be operated by any appropriate input device (for example, a switch) and can be integrated with the electronics for processing/generating the signals such that switching from one mode of operation to another controls movement of the multi-frequency structure 505 and selects a relevant part of the electronics for operation.
- Figure 3A shows an offset type Cassegrain-antenna
- the sub-reflector 300 operating in a high frequency mode where the signal is sent via sub-reflector 330 to primary reflector 310 and onwards for transmission.
- the sub-reflector is mounted for movement out of the path of the low frequency feed 340. This movement may be linear and/or rotational .
- Figure 3B shows the Cassegrain-type sub-reflector having been moved out of the path of the low frequency feed 340 and the low frequency feed in operation with the signal path Z 3B being transmitted via the primary reflector 310.
- Figures 4A and 4B show a further arrangement which is an offset-Gregorian type antenna .
- Figure 4A shows a high frequency mode of operation where the signal path involves the high frequency feed 420 the sub-reflector 430 and the primary reflector 410 such that it is a dual reflector arrangement.
- the low frequency feed 440 and the sub-reflector 430 are mounted to a mount 450 which can be rotated and the low frequency feed 440 is further mounted for translational movement relative to the mount 450 as indicated by arrow P to move the low frequency feed P to the focus of the primary reflector 410 of the antenna of Figures 4A and 4B such that it operates as shown in Figure 4B in the low frequency mode.
Abstract
An antenna (100) for satellite communications, comprising a primary reflector (110), a prime focus feed (120), a dual-reflector feed (140), and a sub-reflector (130). The prime focus feed (120) and the sub-reflector (130) are mounted for movement relative to the primary reflector (110) between a first configuration in which the prime focus feed (120) and the primary reflector (110) define a first signal path and a second configuration in which the primary reflector (110), the sub-reflector (130) and the dual-reflector feed (140) define a second signal path.
Description
A MULTI-BAND ANTENNA Field
The invention relates to an antenna suitable for satellite communications . Background
In many circumstances, it is necessary to be able to operate at different frequency bands on different
satellites thus requiring a large number of antennas .
Summary of the Invention
The invention provides an antenna comprising:
a primary reflector;
a prime focus feed;
a dual-reflector feed; and
a sub-reflector,
the prime focus feed and the sub-reflector mounted for movement relative to the primary reflector between a first configuration in which the prime focus feed and the primary reflector define a first signal path and a second configuration in which the primary reflector, the sub- reflector and the dual-reflector feed define a second signal path.
In an embodiment, the prime focus feed and sub-reflector are mounted together for rotational movement around a pivot point between the first and second configurations . In an embodiment, the prime focus feed and sub-reflector are mounted to the primary reflector.
In an embodiment, the dual-reflector feed is co-located with the primary reflector.
In an embodiment, the dual-reflector feed is off-set from the primary reflector.
In an embodiment, the sub-reflector is mounted for independent movement relative to the prime focus feed. In an embodiment, the prime focus feed and sub-reflector are mounted for rotational movement around a pivot point between the first and second configurations .
In an embodiment, the sub-reflector is mounted for translational movement relative to the prime focus feed.
Brief Description of the Drawings
Figures IA and IB show a Gregorian-type antenna in first and second configurations;
Figures 2A and 2B show a Cassegrain-type antenna in first and second configurations; Figures 3A and 3B show an offset Cassegrain-type antenna in first and second configurations ;
Figures 4A and 4B show an offset Gregorian-type antenna in first and second configurations; and
Figure 5 , shows a detail of the Cassegrain-type antenna of Figure 2.
Detailed Description
The embodiment relates to a reconfigurable multi-band antenna that can operate in one set of frequency bands
with a prime focus feed and non-simultaneously at another set of frequency bands with a dual reflector arrangement incorporating a sub-reflector and dual-reflector feed. In the embodiment, the feed is a feed horn but the feed could also be a patch, crossed dipole, phase array etc and could be different for each band. For example, a patch for L- band and a horn for X-band. This antenna arrangement may provide simultaneous coverage at multiple frequency bands but not at all band sets at once . This arrangement is based on the realisation that while it is desirable to be able to operate at different frequency bands on different satellites , simultaneous operation may not be required for all bands. Further, antennas of the embodiment have the advantage of reducing the space required to mount the relatively large antennas required for satellite
communications while allowing operation in a plurality of different frequency bands on different satellites . This advantage is particularly important in maritime
applications where deck space is at a premium.
The embodiment provides an antenna system that provides a prime focus feed, which will generally be used for lower frequency satellite systems such as Inmarsat and a sub- reflector that can be mechanically switched in place of the prime focus feed to provide a dual reflector feed configuration which will be used, for example, for the higher frequency commercial and military satellites . Both feeds may operate in either simplex mode (receive Only) or full duplex mode (transmit and receive) .
In one mode of operation, the dual-reflector feed
illuminates the sub-reflector which in turn illuminates the primary reflector. In this mode, the prime focus feed is behind the sub-reflector and is not illuminated by the signal from the dual-reflector feed.
In each of the following embodiments the prime focus feed is a low frequency feed, for example for L-band or C-band whereas the dual-reflector feed is a high frequency feed such as for X-band, Ku-band, K-band, Ka-band etc. A person skilled in the art will appreciate that while this arrangement has certain advantages , other configurations are possible.
Referring to Figures 1 to 4 , it is noted that in each of these figures a dashed line marked Y with a subscript corresponding to the figure number (e.g. YIA for Figure IA) shows the outermost possible signal path for the
arrangement shown in the relevant figure whereas a line marked Z with a subscript corresponding to the figure number (e.g. ZiA) shows an exemplary single signal path. A person skilled in the art will appreciate that in all of Figures 1 to 4 , the signal path can be reversed for the feed to receive a signal rather than transmit a signal . Referring to Figure IA, a Gregorian-type antenna 100 is shown in a first configuration which corresponds to a high frequency mode of operation where a signal is emitted from the high frequency feed (120) which provides the dual- reflector feed to the sub-reflector 130 where it is reflected to the primary reflector 110 and transmitted outwardly . Between Figures IA and IB the sub-reflector 130 and the low frequency feed 140 have been rotated around axis of rotation X to move the antenna to a second configuration where it is possible for the antenna to assume a second mode of operation where the low frequency feed 140 generates a signal path using the primary reflector 110 as indicated by line Z1B in this arrangement, the Gregorian-type sub-reflector is moved to a position where it does not interfere with the signal path,
substantially behind the low frequency feed in the antenna 100. A person skilled in the art will appreciate that as well as rotating around axis X, it is possible in some
implementations for the sub-reflector and the low
frequency feed to be translated along the vertical axis .
Referring to Figures 2A and 2B, a Cassegrain-type antenna 200 is shown in a first configuration. In Figure 2A the antenna 200 is operating in a high frequency mode where the high frequency feed 210 transmits a signal onto the sub-reflector 230 which reflects it off the primary reflector 210 for transmission.
Figure 2B shows a second configuration . To be moved to the second configuration, the low frequency feed 240 and the Cassegrain-type sub-reflector 230 have been rotated around in the axis indicated by arrow X. Again, in some
implementations, there may be axial movement along the axis perpendicular to X. Again the Cassegrain-type sub reflector 230 is moved to a position where it is out of the way of the signal path behind the low frequency feed. Figure 5, shows one implementation of the antenna 200 of Figure 2. The low frequency feed 240 and the sub-reflector 230 are parts of a multi-frequency structure 505 mounted by mount 580 for rotational movement with a rotatable drive shaft 530 mounted between bearing 540 and stepper motor 520, and driven by the stepper motor 520 which operates under control of a control circuit mounted within equipment housing 550 to be driven between two positions 180 degrees apart. Bearing 540 and stepper motor 520 are mounted respectively to a set of struts 510A, 510B
extending from the primary reflector 210. Persons skilled in the art will appreciate that in other embodiments, additional struts may be provided as necessary to securely mount the multi-frequency structure 505. In the
embodiment, a pair of linear actuators 560A, 560B are driven by linear motors to extend or retract the sub- reflector to a desired position.
Persons skilled in the art will appreciate that the control circuit can be operated by any appropriate input device (for example, a switch) and can be integrated with the electronics for processing/generating the signals such that switching from one mode of operation to another controls movement of the multi-frequency structure 505 and selects a relevant part of the electronics for operation.
Figure 3A shows an offset type Cassegrain-antenna
300operating in a high frequency mode where the signal is sent via sub-reflector 330 to primary reflector 310 and onwards for transmission. As indicated by arrow M in Figure 3A the sub-reflector is mounted for movement out of the path of the low frequency feed 340. This movement may be linear and/or rotational .
Figure 3B shows the Cassegrain-type sub-reflector having been moved out of the path of the low frequency feed 340 and the low frequency feed in operation with the signal path Z3B being transmitted via the primary reflector 310.
Figures 4A and 4B show a further arrangement which is an offset-Gregorian type antenna . Figure 4A shows a high frequency mode of operation where the signal path involves the high frequency feed 420 the sub-reflector 430 and the primary reflector 410 such that it is a dual reflector arrangement. As indicated by rotational axis N and translational axis P, the low frequency feed 440 and the sub-reflector 430 are mounted to a mount 450 which can be rotated and the low frequency feed 440 is further mounted for translational movement relative to the mount 450 as indicated by arrow P to move the low frequency feed P to the focus of the primary reflector 410 of the antenna of Figures 4A and 4B such that it operates as shown in Figure 4B in the low frequency mode.
It will be understood to persons skilled in the art of the invention that many modifications may be made without departing from the spirit and scope of the invention, in particular it will be apparent that certain features of embodiments of the invention can be employed to form further embodiments .
Further details on the construction of feeds and
reflectors can be found in "Microwave Horns and Feeds" by AD Olver, PJB Clarricoats, AA Kishk; and L Shafai .
In the claims which follow and in the preceding
description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as
"comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
Claims
1. An antenna for satellite communications, comprising: a primary reflector;
a prime focus feed;
a dual-reflector feed; and
a sub-reflector,
the prime focus feed and the sub-reflector mounted for movement relative to the primary reflector between a first configuration in which the prime focus feed and the primary reflector define a first signal path and a second configuration in which the primary reflector, the sub- reflector and the dual-reflector feed define a second signal path .
2. An antenna as claimed in claim 1 , wherein the prime focus feed and sub-reflector are mounted together for rotational movement around a pivot point between the first and second configurations .
3. An antenna as claimed in claim 1 or claim 2 , wherein the prime focus feed and sub-reflector are mounted to the primary reflector .
4. An antenna as claimed claim any one of claims 1 to 3, wherein the dual-reflector feed is co-located with the primary reflector .
5. An antenna as claimed in claim 1 wherein the dual- reflector feed is off-set from the primary reflector.
6. An antenna as claimed in claim 5 , wherein the sub- reflector is mounted for independent movement relative to the prime focus feed.
7. An antenna as claimed in claim 5 , wherein the prime focus feed and sub-reflector are mounted for rotational movement around a pivot point between the first and second configurations .
8. An antenna as claimed in claim 7 , wherein the sub- reflector is mounted for translational movement relative to the prime focus feed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2009903640A AU2009903640A0 (en) | 2009-08-04 | A multi-band antenna | |
| AU2009903640 | 2009-08-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2011014919A1 true WO2011014919A1 (en) | 2011-02-10 |
| WO2011014919A9 WO2011014919A9 (en) | 2011-12-29 |
Family
ID=43543818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/AU2010/000987 WO2011014919A1 (en) | 2009-08-04 | 2010-08-04 | A multi-band antenna |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2011014919A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102800994A (en) * | 2012-07-31 | 2012-11-28 | 深圳光启创新技术有限公司 | Cassegrain type metamaterial antenna |
| WO2014019524A1 (en) * | 2012-07-31 | 2014-02-06 | 深圳光启创新技术有限公司 | Cassegrain-type metamaterial antenna |
| KR101477199B1 (en) * | 2013-07-03 | 2014-12-29 | (주)인텔리안테크놀로지스 | Satellite receiving/transmitting anttena having structure for switching multiple band signal |
| WO2015116705A1 (en) | 2014-01-28 | 2015-08-06 | Sea Tel, Inc. (Dba Cobham Satcom) | Tracking antenna system having multiband selectable feed |
| WO2017004439A1 (en) * | 2015-07-02 | 2017-01-05 | Sea Tel, Inc. (d/b/a Cobham SATCOM) | Multiple-feed antenna system having multi-position subreflector assembly |
| US11469515B2 (en) | 2020-02-25 | 2022-10-11 | Isotropic Systems Ltd. | Prism for repointing reflector antenna main beam |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102800995B (en) * | 2012-07-31 | 2015-07-01 | 深圳光启创新技术有限公司 | Cassegrain metamaterial antenna |
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| US3710341A (en) * | 1971-03-17 | 1973-01-09 | Radiation Inc | Gregorian antenna with ring focus |
| US5373302A (en) * | 1992-06-24 | 1994-12-13 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Double-loop frequency selective surfaces for multi frequency division multiplexing in a dual reflector antenna |
| US5485168A (en) * | 1994-12-21 | 1996-01-16 | Electrospace Systems, Inc. | Multiband satellite communication antenna system with retractable subreflector |
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2010
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|---|---|---|---|---|
| US3710341A (en) * | 1971-03-17 | 1973-01-09 | Radiation Inc | Gregorian antenna with ring focus |
| US5373302A (en) * | 1992-06-24 | 1994-12-13 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Double-loop frequency selective surfaces for multi frequency division multiplexing in a dual reflector antenna |
| US5485168A (en) * | 1994-12-21 | 1996-01-16 | Electrospace Systems, Inc. | Multiband satellite communication antenna system with retractable subreflector |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9742074B2 (en) | 2012-07-31 | 2017-08-22 | Kuang-Chi Innovative Technology Ltd. | Cassegrain-type metamaterial antenna |
| WO2014019524A1 (en) * | 2012-07-31 | 2014-02-06 | 深圳光启创新技术有限公司 | Cassegrain-type metamaterial antenna |
| CN102800994B (en) * | 2012-07-31 | 2015-04-15 | 深圳光启创新技术有限公司 | Cassegrain type metamaterial antenna |
| CN102800994A (en) * | 2012-07-31 | 2012-11-28 | 深圳光启创新技术有限公司 | Cassegrain type metamaterial antenna |
| KR101477199B1 (en) * | 2013-07-03 | 2014-12-29 | (주)인텔리안테크놀로지스 | Satellite receiving/transmitting anttena having structure for switching multiple band signal |
| WO2015002338A1 (en) | 2013-07-03 | 2015-01-08 | Intellian Technologies Inc. | Antenna for satellite communication having structure for switching multiple band signals |
| US10615504B2 (en) | 2013-07-03 | 2020-04-07 | Intellian Technologies Inc | Antenna for satellite communication having structure for switching multiple band signals |
| US10199734B2 (en) | 2013-07-03 | 2019-02-05 | Intellian Technologies Inc. | Antenna for satellite communication having structure for switching multiple band signals |
| EP3008775A4 (en) * | 2013-07-03 | 2017-02-15 | Intellian Technologies Inc. | Antenna for satellite communication having structure for switching multiple band signals |
| EP3100320A4 (en) * | 2014-01-28 | 2017-10-11 | Sea Tel, Inc. (DBA Cobham Satcom) | Tracking antenna system having multiband selectable feed |
| US10038251B2 (en) | 2014-01-28 | 2018-07-31 | Sea Tel, Inc | Tracking antenna system having multiband selectable feed |
| KR20160138389A (en) * | 2014-01-28 | 2016-12-05 | 씨텔, 인크. | Tracking antenna system having multiband selectable feed |
| WO2015116705A1 (en) | 2014-01-28 | 2015-08-06 | Sea Tel, Inc. (Dba Cobham Satcom) | Tracking antenna system having multiband selectable feed |
| KR102153441B1 (en) | 2014-01-28 | 2020-09-08 | 씨텔, 인크. | Tracking antenna system having multiband selectable feed |
| WO2017004439A1 (en) * | 2015-07-02 | 2017-01-05 | Sea Tel, Inc. (d/b/a Cobham SATCOM) | Multiple-feed antenna system having multi-position subreflector assembly |
| US9929474B2 (en) | 2015-07-02 | 2018-03-27 | Sea Tel, Inc. | Multiple-feed antenna system having multi-position subreflector assembly |
| US10170842B2 (en) | 2015-07-02 | 2019-01-01 | Sea Tel, Inc. | Multiple-feed antenna system having multi-position subreflector assembly |
| US10498043B2 (en) | 2015-07-02 | 2019-12-03 | Sea Tel, Inc. | Multiple-feed antenna system having multi-position subreflector assembly |
| US10998637B2 (en) | 2015-07-02 | 2021-05-04 | Sea Tel, Inc. | Multiple-feed antenna system having multi-position subreflector assembly |
| US11699859B2 (en) | 2015-07-02 | 2023-07-11 | Sea Tel, Inc. | Multiple-feed antenna system having multi-position subreflector assembly |
| US11469515B2 (en) | 2020-02-25 | 2022-10-11 | Isotropic Systems Ltd. | Prism for repointing reflector antenna main beam |
| US11888228B2 (en) | 2020-02-25 | 2024-01-30 | All.Space Networks Limited | Prism for repointing reflector antenna main beam |
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|---|---|
| WO2011014919A9 (en) | 2011-12-29 |
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