GB2061018A - Filter for separating radio signals of two different doubly linearly polarised frequency bands - Google Patents
Filter for separating radio signals of two different doubly linearly polarised frequency bands Download PDFInfo
- Publication number
- GB2061018A GB2061018A GB8030250A GB8030250A GB2061018A GB 2061018 A GB2061018 A GB 2061018A GB 8030250 A GB8030250 A GB 8030250A GB 8030250 A GB8030250 A GB 8030250A GB 2061018 A GB2061018 A GB 2061018A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- polarisation
- signals
- wave guide
- guide section
- 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- Withdrawn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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
- H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2131—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies with combining or separating polarisations
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Connection Structure (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
A filter for separating radio signals of two different doubly linearly polarised frequency bands is so constructed that after separation of the frequency bands the signals of each band are resolved with respect to their polarisation direction by means of polarisation filtering. In order that rotation of the polarisation vectors of the transmitted and received signals due to frequency- dependent Faraday effect can be counteracted, the filter as a whole is rotatable about coupling 11 relative to an associated aerial and the filter means for the two frequency bands are rotatable about coupling 12 relative to each other. The lower frequency band is separated from the upper by a filter 1 and the separate polarization components of the lower band are transmitted to outputs 9, 10 by pairs of guides 7, 7' and 8, 8'. The components of the upper band are derived at outputs 5, 6. <IMAGE>
Description
SPECIFICATION
Filter for separating radio signals of two different doubly linearly polarised frequency bands
The present invention relates to a filter for the separation of two signals which each consist of two linearly polarised frequency bands of different frequency.
In German (Fed. Rep.) patent specification No. 24 43 166 there is disclosed a system filter for separating two doubly linearly polarised frequency bands in respect of the frequency bands and the directions of polarisation. Each frequency band contains two signals, the field vectors of which are polarised at right angles to each other. One of the signals in one of the frequency bands represents a received signal and the signal polarised at right angles thereto in the other frequency represents a transmitted signal.
With satellite radio relay in the frequency range below 10 GigaHertz, the time-variable, nonreciprocal mutual rotation of the received and transmitted vectors has an adverse effect on the signal decoupling due to Faraday effect. The angles of rotation of the received vector and transmitted vector are dependent on the frequency and are different, since received and transmitted vectors belong to different frequency bands. This means that even with possible reciprocal rotation of received and transmitted vectors, these are not perpendicular to one another. To avoid a signal cross-coupling, care has to be taken that the received vector and the transmitted vector are polarised at right angles at the locations of the satellite aerial and ground station aerial and that the polarisation of the vectors is aligned parallel to the polarisation of the respective aerial.
There is accordingly a desire for a filter of the general type disclosed in German (Fed. Rep.) patent specification No. 24 43 166 in which rotations of transmitted and received vectors caused by the
Faraday effect can be corrected.
According to the present invention there is provided a filter for separating radio signals of two different doubly linearly polarised frequency bands, the filter being mounted to be rotatable as a unit about a wave guide axis thereof and comprising a first wave guide section for guiding doubly polarised signals of both frequency bands, a second wave guide section adapted to form the signals of one of the bands into standing waves while reflecting the signals of the other band and being provided with resolving means for resolving the signals of said one band into their respective polarisation directions, the resolving means comprising respective signal feed means associated with each polarisation direction and communicating with the second wave guide section at two opposite wall locations thereof, guide means so connected to the resolving means as to guide the resolved signals to a respective output for each polarisation direction, a third wave guide section for guiding the signals of only said other band, and a polarisation filter, which is connected to the third wave guide section to resolve the signals of said other band into their respective polarisation directions and to guide the resolved signals to a respective output for each polarisation direction and which is mounted to be rotatable relative to the second wave guide section about said axis.
Expediently, a wave guide section with a rotary coupling is arranged at the inlet of the first wave guide section after an aerial, and the third wave guide section, arranged between the second wave guide section and the polarisation filter is connected to the polarisation filter by means of a rotary coupling.
Advantageously, the entire filter and, separately therefrom, the polarisation filter for the second frequency band, are rotated automatically under the control of polarisation measuring sensors.
An embodiment of the present invention will now be more particularly described by way of example with reference to the accompanying drawings, in which:
Figure lisa side view of a filter according to the said embodiment, and
Figure 2 is a plan view, in the direction of the arrow X, of the filter of Figure 1.
Referring now to the drawings, there is shown a system filter of the general kind disclosed in German (Fed. Rep.) patent specification No.2443166 but restructured in in accordance with the embodiment of the present invention. The filter comprises a first wave guide section 1, in which two doubly linearly polarised signals originating from two different frequency bands are present. The lower frequency band, for example, is coupled out by special coupling means in a succeeding second wave guide section 2. The upper frequency band is conducted on to an adjoining third wave guide section 3, which terminates in a polarisation filter 4, to the outputs 5 and 6 of which are fed the signals of the upper frequency band resolved in their directions of polarisation.The signals coupled out of the second wave guide section 2 are conducted, according to polarisation direction, through two wave guide arms 7 and 7' or 8 and 8', so that present at their outputs 9 and 10 are the signals of the lower frequency band separated according to directions of polarisation.
The system filter embodying the invention is so constructed that the two reference systems of the frequency bands are no longer aligned rigidly relative to each other, but each reference system can be rotated about its axis independently of the other. As a result, any rotation of the polarisation of the received signal or the transmitted signal, which has arisen due to Faraday effect, can be corrected in a simple manner. Any rotation of the polarisation of the received signal can be equalised by rotation of the reference system for the lower frequency band.
For this purpose, arranged ahead of the first wave guide section 1 at the output side of the associated aerial is an additional wave guide piece with a rotary coupling 11, which permits the entire filter to be rotated relative to the aerial.
Any rotation of the polarisation of the transmitted signal is cancelled by rotation of the polarisation filter 4 for the upper frequency band. This is made possible by a further rotary coupling 12, which is included in the third wave guide section 3.
As the rotary couplings are of circular crosssection and the wave guides of square cross-section, transitional sections (not shown) are present to ensure cross-sectional matching.
The rotation of the reference systems for the received and transmitted signals can take place automatically. The rotary couplings are for this purpose provided with drives controlled by polarisation measuring sensors.
In order that sufficient space is present for accommodation of the rotary coupling 12 in the third wave guide section 3, the wave guide arms 7, 7' and 8,8' are bent out relative to the axis of the system filter.
The above described filter, provided with means for correction of rotation of the polarisation of the linearly polarised received and transmitted signals that has arisen as a result of Faraday effect, has a compact manner of construction, which is of advantage when using such a system filter in a small ground station aerial.
Claims (5)
1. Afilterforseparating radio signals of two different doubly linearly polarised frequency bands, the filter being mounted to be rotatable as a unit about a wave guide axis thereof and comprising a first wave guide section for guiding doubly polarised signals of both frequency bands, a second wave guide section adapted to form the signals of one of the bands into standing waves while reflecting the signals of the other band and being provided with resolving means for resolving the signals of said one band into their respective polarisation directions, the resolving means comprising respective signal feed means associated with each polarisation direction and communicating with the second wave guide section at two opposite wall locations thereof, guide means so connected to the resolving means as to guide the resolved signals to a respective output for each polarisation direction, a third wave guide section for guiding the signals of only said other band, and a polarisation filter, which is connected to the third wave guide section to resolve the signals of said other band into their respective polarisation directions and to guide the resolved signals to a respective output for each polarisation direction and which is mounted to be rotatable relative to the second wave guide section about said axis.
2. Filter as claimed in claim 1 comprising rotary coupling means arranged at the inlet of the first wave guide section for rotational coupling of the filter to an aerial.
3. Afilter as claimed in either claim 1 or claim 2, wherein the polarisation filter is connected to the third wave guide by means of a rotary coupling.
4. A filter as claimed in any one of the preceding claims, comprising polarisation measuring sensors adapted to initiate rotation of the filter as a unit and rotation of the polarisation filter relative to the second wave guide section.
5. A filter for separating radio signals of two different doubly linearly polarised frequency bands, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2939679A DE2939679C2 (en) | 1979-09-29 | 1979-09-29 | System switch for a satellite radio system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2061018A true GB2061018A (en) | 1981-05-07 |
Family
ID=6082334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8030250A Withdrawn GB2061018A (en) | 1979-09-29 | 1980-09-18 | Filter for separating radio signals of two different doubly linearly polarised frequency bands |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5651101A (en) |
| CA (1) | CA1150372A (en) |
| DE (1) | DE2939679C2 (en) |
| FR (1) | FR2466876A1 (en) |
| GB (1) | GB2061018A (en) |
| IT (1) | IT1132832B (en) |
| SE (1) | SE8006675L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0096461A2 (en) * | 1982-06-04 | 1983-12-21 | Andrew A.G. | Microwave systems |
| EP0295812A2 (en) * | 1987-06-15 | 1988-12-21 | Gamma-f Corp. a Georgia Corporation | Four port frequency diplexer |
| SE2150108A1 (en) * | 2021-01-29 | 2022-07-30 | Ovzon Sweden Ab | Dual-Band Radio Terminal and Filter Structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013011651A1 (en) * | 2013-07-11 | 2015-01-15 | ESA-microwave service GmbH | Antenna feed system in the microwave range for reflector antennas |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3265993A (en) * | 1964-02-13 | 1966-08-09 | Post Office | Integrated coupling unit for two independent waveguide channels |
| US3731235A (en) * | 1971-11-03 | 1973-05-01 | Gte Sylvania Inc | Dual polarized diplexer |
| US3838362A (en) * | 1973-06-29 | 1974-09-24 | Emerson Electric Co | Diplexing coupler for microwave system |
| DE2443166C3 (en) * | 1974-09-10 | 1985-05-30 | ANT Nachrichtentechnik GmbH, 7150 Backnang | System switch for separating two signals, each consisting of two double polarized frequency bands |
| US4162463A (en) * | 1977-12-23 | 1979-07-24 | Gte Sylvania Incorporated | Diplexer apparatus |
-
1979
- 1979-09-29 DE DE2939679A patent/DE2939679C2/en not_active Expired
-
1980
- 1980-09-02 JP JP12074080A patent/JPS5651101A/en active Granted
- 1980-09-12 IT IT24639/80A patent/IT1132832B/en active
- 1980-09-18 GB GB8030250A patent/GB2061018A/en not_active Withdrawn
- 1980-09-24 SE SE8006675A patent/SE8006675L/en unknown
- 1980-09-29 CA CA000361225A patent/CA1150372A/en not_active Expired
- 1980-09-29 FR FR8020828A patent/FR2466876A1/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0096461A2 (en) * | 1982-06-04 | 1983-12-21 | Andrew A.G. | Microwave systems |
| EP0096461B1 (en) * | 1982-06-04 | 1990-11-28 | Andrew A.G. | Microwave systems |
| EP0295812A2 (en) * | 1987-06-15 | 1988-12-21 | Gamma-f Corp. a Georgia Corporation | Four port frequency diplexer |
| EP0295812A3 (en) * | 1987-06-15 | 1990-03-21 | Gamma-f Corp. a Georgia Corporation | Four port frequency diplexer |
| SE2150108A1 (en) * | 2021-01-29 | 2022-07-30 | Ovzon Sweden Ab | Dual-Band Radio Terminal and Filter Structure |
| SE545208C2 (en) * | 2021-01-29 | 2023-05-23 | Ovzon Sweden Ab | Dual-Band Radio Terminal and Filter Structure |
Also Published As
| Publication number | Publication date |
|---|---|
| SE8006675L (en) | 1981-03-30 |
| JPS6349921B2 (en) | 1988-10-06 |
| CA1150372A (en) | 1983-07-19 |
| JPS5651101A (en) | 1981-05-08 |
| IT1132832B (en) | 1986-07-09 |
| DE2939679A1 (en) | 1981-04-02 |
| IT8024639A0 (en) | 1980-09-12 |
| DE2939679C2 (en) | 1985-12-05 |
| FR2466876A1 (en) | 1981-04-10 |
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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) |