GB2166298A - Antenna excitor for two or more frequency bands - Google Patents
Antenna excitor for two or more frequency bands Download PDFInfo
- Publication number
- GB2166298A GB2166298A GB08526010A GB8526010A GB2166298A GB 2166298 A GB2166298 A GB 2166298A GB 08526010 A GB08526010 A GB 08526010A GB 8526010 A GB8526010 A GB 8526010A GB 2166298 A GB2166298 A GB 2166298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube section
- waveguide
- diplexer
- excitor
- 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.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 3
- 239000000306 component Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 1
- 241001502050 Acis Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- 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
Abstract
An antenna excitor (2) for two different frequency bands is described in which a tube section (4) having a circular internal cross-section is connected to a polarising diplexer (3) for two orthogonal, nearly polarised electromagnetic waves fed through waveguides 5 and 6. At least one waveguide (7) opens into the tube section (4). A second waveguide (8) can be connected to the tube section (4); it can be connected thereto in the manner of a directional coupler offset by 90 DEG in the peripheral direction at the same point along the axis as the first waveguide (7) as shown in dotted outline, or again it can be connected thereto at an axially offset point, as shown in full lines. <IMAGE>
Description
SPECIFICATION
Antenna excitor for two or more frequency bands
This invention relates to an antenna excitor for at least two different frequency bands, comprising a substantially tubular component which incorporates at least one polarising diplexer which will (in use) carry two electromagnetic waves which are polarised at right angles to each other and which are fed in via two waveguides, and also incorporates a tube section to which at least one waveguide is connected which will (in use) carry a linearly polarised electromagnetic wave; the tube section, intended for a lower frequency band, having greater clear dimensions than the diplexer. In this connection reference may be made to U.S.
Patent Specification 4,410,S66.
An antenna excitor as just specified may be used, for example, for illuminating a directional antenna having a parabolic reflector for directional communication, satellite communication or radio direction-finding. In this field, the excitor can be used for directly illuminating the reflector or instead for illuminating it via a subreflector (Cassegrain principle). In this context, the word "illumination" is employed to include both directions of transmission of the electromagnetic waves, that is to say both waves to be radiated and waves to be received.
Polarising diplexers for illuminating reflectors are known, for example, from U.S. Patent Specification 3,864,688. They are used for decoupling two linearly polarised electromagnetic waves, carried via connected waveguides, in such a manner that they do not mutually interfere. In this known polarising diplexer, a cylindrical tube section is used for this purpose, into which two waveguides open next to each other. The two waves are decoupled by a number of mutually offset pins or a twisted metal strip, disposed in the tube section between the connecting points of the two waveguides. By this means, one wave is rotated by 90 so that the two waves are perpendicular to each other.The requirement for interference-free guidance of two orthogonally polarised waves of the same frequency band can thus be met, with a certain degree of effort and expense, by this known arrangement.
The antenna excitor of U.S. Patent Specification 4,410,866, as initially indicated, has two polarising diplexers, each designed for a different frequency band. This antenna excitor can carry simultaneously two orthogonal waves of the 3.7 to 4.2 GHz frequency band (called the "4-GHz band" hereinafter) and two orthogonal waves of the 5.925 to 6.425 GHz frequency band (called the "6-GHz band" hereinafter), for example. In the tubular polarising diplexer for the 4-GHz band which is used in this arrangement, filters are installed which are intended to act as a short circuit for the 4-GHz band to prevent the waves from propagating in the wrong direction. In contrast, the waves of the 6
GHz band are not intended to be affected by the filters.The provision of these filters, made from beryllium oxide, and the installation of the filters, entail a considerable effort and expense, particu
larly since the filters necessitate high-precision manufacturing procedures. Between the two pola
rising diplexers, a conical adaptor is also provided, which makes the antenna excitor longer and heavier. This makes it more difficult to install in an antenna system. In addition, this adaptor too necessitates high-precision manufacturing procedures if no interfering reflections are to occur.
It is an object of the present invention to provide an antenna excitor for at least two frequency bands, the construction of which is simpler than the known design.
According to the present invention, there is provided an antenna excitor for at least two different frequency bands, comprising a substantially tubular component which incorporates at least one polarising diplexer which will (in use) carry two electromagnetic waves which are polarised at right angles to each other and which are fed in via two waveguides, and also incorporates a tube section to which at least one waveguide is connected which will (in use) carry a linearly polarised electromagnetic wave; the tube section, intended for a lower frequency band, having greater clear dimensions than the diplexer; wherein:
the tube section has a circular internal cross-section, and is directly connected to the diplexer, which also has a circular internal cross-section; and
the clear diameter of the tube section is greater than the clear diameter of the diplexer.
The present antenna excitor employs only two components, a polarising diplexer and a tube section, which are directly connected to each other.
No adaptors are needed between these two components, nor is it necessary to provide any separate short-circuit element(s) for suppressing propagation of the electromagnetic waves in the wrong direction. The antenna excitor is accordingly of simple construction, and axially it is as short as it could be.Thus not only is it simply and economically produced but also its weight can be reduced as compared with the known design, and its installation is simpler. Separate short-circuit elements, which in the prior art have always been required, are not needed between the polarising diplexer and the tube section of the present excitor, because the tube section has greater clear dimen- sions that the diplexen As a result, there is a projection at the junction between these two com ponents, and this acts like a short circuit for the wave fed into the tube section.
These advantages apply even if a second linearly polarised wave, which is perpendicular to the wave fed in by the first waveguide, is coupled into the tube section via a second waveguide. The second waveguide can be connected to the tube section in a position offset by 90 in the peripheral direction with respect to the first waveguide at the same point along the axis as the latter. However, it is also possible to connect the second waveguide wi.h a directional coupler effect at another point along the acis of the tube section.
One embodiment of the invention is shown in the accompanying diagrammatic drawings, in which:
Figure l is a side view of an antenna arrangement comprising an antenna excitor according to the invention,
Figure 2 shows the antenna excitor itself on an enlarged scale,
Figure 3 is an end view of the antenna excitor of
Figure 2 taken in the direction of the arrow A in
Figure 2, and
Figure 4 is a fragmentary axial section comparable to Figure 2 but on an enlarged scale.
In the present description and claims, "excitor" is used to mean "antenna excitor", and "diplexer" is used to mean "polarising diplexer".
In Figure 1, the parabolic reflector of an antenna system, which is mounted, for example, at the tip of a mast, is designated by 1. At the focus of reflector 1, an excitor 2 is provided which comprises a diplexer 3 and a tube section 4. Two waveguides 5 and 6 open into diplexer 3, and two waveguides 7 and 8 are connected to tube section 4. The excitor 2 can have an opening 9 which expands in the direction of the reflector 1. The installation and arrangement of the individual parts of such an antenna system are familiar to those skilled in the art.
For this reason, they will not be discussed in detail.
In the case of Figure 1, excitor 2 is used for direct illumination of the reflector 1. In principle, however, it is also possible to use the excitor 2 for an antenna system having subreflectors.
The diplexer 3 comprises a tube section having a circular internal cross-section. It is constructed in such a manner that it can carry, in decoupled manner, two mutually perpendicular linearly polarised waves of the same frequency band, for example of the 6-GHz band. The two waveguides 5 and 6 open into the diplexer 3 radially with respect to the tubular diplexer. The junctions of the two waveguides can be mutually offset by 90" in the peripheral direction thus directly ensuring that the directions of polarisation of the two waves fed in are perpendicular to each other.
However, the diplexer 3 is of an arbitrary or optional design in certain respects. Thus, it can also contain a short circuit element 10 which prevents the wave supplied by waveguide 6 from propagating in the wrong direction. Again, it is possible to place the feed point of the waveguide 5 at the otherwise closed face 11 of diplexer 3, so that the short circuit element can be ornitted. Such a diplexer is described, for example, in German Offenlegungsschrift 3,241,890.
Tube section 4, which also has a circular internal cross-section, is directly connected to diplexer 3.
The clear diameter of tube section 4 is greater than the clear diameter of diplexer 3; thus there is a projection 12, emphasised by stippling in Figure 3, at the junction of the two components. The projection 12 acts like a short circuit, or like a block, for the wave fed in via the waveguide 7, so that the wave cannot propagate in the direction of the diplexer 3, but only in the direction of the opening 13, provided for radiation, of the excitor 2. Via the waveguide 7, there is fed in a wave of a frequency band lower than that of the waves of the diplexer 3, e.g. of the 4-GHz band. The waves carried in diplexer 3 can pass undisturbed through tube section 4.
The tube section 4, having a circular internal cross-section, can also be used as a diplexer for two linearly polarised waves if there is fed in via waveguide 8 a second wave, the direction of polarisation of which is perpendicular to the direction of polarisation of the wave supplied via the first waveguide 7. As indicated in dashed lines in Figure 2, the waveguide 8 may be connected to the tube section 4 at the same place along the axis as waveguide 7, but in a position offset by 90" in the peripheral direction.
Alternatively it is possible to connect the waveguide 8 to the tube section 4 at a different axial point, in the manner of a directional coupler (O-db coupler). The wave fed in this manner can propagate only in the direction of the opening 13 of the excitor 2, so that at this point in the tube section 4 no wave-controlling elements and particularly no separate short circuit elements are needed. The wave is coupled into the tube section 4 in known manner through several holes 14 (Figure 4) in the walls of the tube section 4 and of the waveguide 8.
An absorber 15 may be provided at the end of the waveguide 8.
At the openings of the excitor 2, to which the wave guides 5 to 8 are connected, orthodox filters (known from the prior art) can be provided. This does not affect the remainder of the structure of the excitor 2. At the junction between diplexer 3 and tube section 4, at least one circumferential step 16 can also be provided in the cross-section (Figure 2), by means of which step the short circuit effect of the projection 12 can be improved.
in the case illustrated, the excitor 2 is presented as a two-frequency-band excitor. It can also be used for three or more frequency bands, by appropriate extension. For example, for a third frequency band, it is only necessary to connect another tube section having appropriately enlarged dimensions, comparable to the first tube section 4. The excitor 2 can be used not only for the two frequency bands specified, namely the 4-GHz band and the 6
GHz band, but also, in principle, for any combination of two or more different frequency bands.
The preceding description has been concerned with an arrangement in which the electromagnetic waves are supplied via the waveguides 5 to 8 and are radiated by the reflector 1. However, the excitor 2 is also operable in the converse arrangement in which electromagnetic waves are received by the reflector 1 and are carried via the excitor 2 into the waveguides 5 to 8.
In addition, it will of course be understood that the present invention has been described above purely by way of example, and that various modifications of detail can be made within the ambit of the invention.
Claims (1)
1. An antenna excitor for at least two different frequency bands, comprising a substantially tubular component which incorporates at least one polarising diplexer which will (in use) carry two electromagnetic waves which are polarised at right angles to each other and which are fed in via two waveguides, and also incorporates a tube section to which at least one waveguide is connected which will (in use) carry a linearly polarised electromagnetic wave; the tube section, intended for a lower frequency band, having greater clear dimensions than the diplexer; wherein:
the tube section has a circular internal cross-section, and is directly connected to the diplexer, which also has a circular internal cross-section; and
the clear diameter of the tube section is greater than the clear diameter of the diplexer.
2. An excitor according to claim 1, wherein a second waveguide, which will (in use) carry a linearly polarised electromagnetic wave, is connected to the tube section at the same point along the axis as the first waveguide, but in a position offset by 90 in the peripheral direction with respect to the first waveguide.
3. An excitor according to claim 1, wherein a second waveguide, which will (in use) carry a linearly polarised electromagnetic wave, is connected to the tube section in the manner of a directional coupler at a point which is axially offset with respect to the first waveguide.
4. An excitor according to claim 1, 2 or 3, wherein the tube section is provided with at least one circumferential step at the junction between the tube section and the diplexer.
5. An excitor according to claim 1, substantially as described with reference to any Figure or Figures of the accompanying drawing.
Amendments to the claims have been filed, and have the following effect: (a) Claims 1 to 3 above have been deleted or textually amended.
(b) New or textually amended claims have been filed as follows:
(c) Claims 4 and 5 above have been re-numbered as 2 and 3 and their appendancies corrected.
1. An antenna excitor for at least two different frequency bands, comprising a substantially tubular component which incorporates at least one polarising diplexer which will (in use) carry two electromagnetic waves which are polarised at right angles to each other and which are fed in via two waveguides, and also incorporates a tube section to which at least one waveguide is connected which will (in use) carry a linearly polarised electromagnetic wave; the tube section, intended for a lower frequency band, having greater clear dimensions than the diplexer; wherein:
the tube section has a circular internal cross-section, and is directly connected to the diplexer, which also has a circular internal cross-section;
the clear diameter of the tube section is greater than the clear diameter of the diplexer; and a second waveguide, which will (in use) carry a linearly polarised electromagnetic wave, is connected to the tube section in the manner of a directional coupler at a point which is axially offset with respect to the first waveguide.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843439413 DE3439413A1 (en) | 1984-10-27 | 1984-10-27 | ANTENNA EXTENSION FOR AT LEAST TWO DIFFERENT FREQUENCY BANDS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8526010D0 GB8526010D0 (en) | 1985-11-27 |
| GB2166298A true GB2166298A (en) | 1986-04-30 |
| GB2166298B GB2166298B (en) | 1988-12-14 |
Family
ID=6248923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08526010A Expired GB2166298B (en) | 1984-10-27 | 1985-10-22 | Antenna excitor for two or more frequency bands |
Country Status (5)
| Country | Link |
|---|---|
| BR (1) | BR8505308A (en) |
| DE (1) | DE3439413A1 (en) |
| FR (1) | FR2572594B1 (en) |
| GB (1) | GB2166298B (en) |
| IT (1) | IT1182939B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2603742A1 (en) * | 1986-09-08 | 1988-03-11 | Kabelmetal Electro Gmbh | ANTENNA DRIVER FOR AT LEAST TWO DIFFERENT FREQUENCY BANDS |
| US5255003A (en) * | 1987-10-02 | 1993-10-19 | Antenna Downlink, Inc. | Multiple-frequency microwave feed assembly |
| EP0812029A1 (en) * | 1996-06-07 | 1997-12-10 | HE HOLDINGS, INC. dba HUGHES ELECTRONICS | Plural frequency antenna feed |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4113760C2 (en) * | 1991-04-26 | 1994-09-01 | Hirschmann Richard Gmbh Co | Arrangement for converting a microwave type |
| DE19961237A1 (en) | 1999-12-18 | 2001-06-21 | Alcatel Sa | Antenna for radiation and reception of electromagnetic waves |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2117980A (en) * | 1982-03-25 | 1983-10-19 | Italiana Esercizio Telefon | Dual polarisation signal waveguide device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3864688A (en) * | 1972-03-24 | 1975-02-04 | Andrew Corp | Cross-polarized parabolic antenna |
| US4258366A (en) * | 1979-01-31 | 1981-03-24 | Nasa | Multifrequency broadband polarized horn antenna |
| FR2488055A1 (en) * | 1980-07-31 | 1982-02-05 | Thomson Csf | ANTENNA TRANSDUCER FOR EMISSION-RECEPTION ANTENNA AND PRIMARY ANTENNA SOURCE EQUIPPED WITH SUCH TRANSDUCER |
| DE3111106A1 (en) * | 1981-03-20 | 1982-09-30 | Siemens AG, 1000 Berlin und 8000 München | Polarisation filter |
| DE3241890A1 (en) * | 1982-11-12 | 1984-05-17 | kabelmetal electro GmbH, 3000 Hannover | POLARIZING SWITCH WITH FINE HORN |
-
1984
- 1984-10-27 DE DE19843439413 patent/DE3439413A1/en not_active Ceased
-
1985
- 1985-08-19 FR FR858512489A patent/FR2572594B1/en not_active Expired
- 1985-10-22 GB GB08526010A patent/GB2166298B/en not_active Expired
- 1985-10-24 BR BR8505308A patent/BR8505308A/en unknown
- 1985-10-25 IT IT48720/85A patent/IT1182939B/en active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2117980A (en) * | 1982-03-25 | 1983-10-19 | Italiana Esercizio Telefon | Dual polarisation signal waveguide device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2603742A1 (en) * | 1986-09-08 | 1988-03-11 | Kabelmetal Electro Gmbh | ANTENNA DRIVER FOR AT LEAST TWO DIFFERENT FREQUENCY BANDS |
| US4758806A (en) * | 1986-09-08 | 1988-07-19 | Kabelmetal Electro Gesellschaft Mit Beschrankter Haftung | Antenna exciter for at least two different frequency bands |
| US5255003A (en) * | 1987-10-02 | 1993-10-19 | Antenna Downlink, Inc. | Multiple-frequency microwave feed assembly |
| EP0812029A1 (en) * | 1996-06-07 | 1997-12-10 | HE HOLDINGS, INC. dba HUGHES ELECTRONICS | Plural frequency antenna feed |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2166298B (en) | 1988-12-14 |
| GB8526010D0 (en) | 1985-11-27 |
| IT1182939B (en) | 1987-10-05 |
| FR2572594A1 (en) | 1986-05-02 |
| BR8505308A (en) | 1986-08-05 |
| FR2572594B1 (en) | 1989-08-25 |
| IT8548720A0 (en) | 1985-10-25 |
| DE3439413A1 (en) | 1986-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |