EP2195877A1 - Omt type broadband multiband transmission-reception coupler-separator for rf frequency telecommuncations antennas - Google Patents
Omt type broadband multiband transmission-reception coupler-separator for rf frequency telecommuncations antennasInfo
- Publication number
- EP2195877A1 EP2195877A1 EP08803722A EP08803722A EP2195877A1 EP 2195877 A1 EP2195877 A1 EP 2195877A1 EP 08803722 A EP08803722 A EP 08803722A EP 08803722 A EP08803722 A EP 08803722A EP 2195877 A1 EP2195877 A1 EP 2195877A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- coupler
- port
- coupling
- omt
- 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
- 230000008878 coupling Effects 0.000 claims abstract description 52
- 238000010168 coupling process Methods 0.000 claims abstract description 52
- 238000005859 coupling reaction Methods 0.000 claims abstract description 52
- 230000003247 decreasing effect Effects 0.000 claims abstract description 5
- 230000000903 blocking effect Effects 0.000 claims description 8
- 230000010287 polarization Effects 0.000 abstract description 15
- 230000001902 propagating effect Effects 0.000 abstract description 6
- 230000006798 recombination Effects 0.000 abstract description 3
- 238000005215 recombination Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005323 electroforming Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 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
- H01P1/16—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
Definitions
- the present invention relates to a very broadband multi-band transceiver coupler-splitter type OMT ("OrthoMode Transducer” that is to say, coupler orthomode) for microwave telecommunications antennas.
- OMT Organic Multi-Mode Transducer
- Such a device can also be called “multiplexer” or “OMT multiplexer”. To simplify the description, this device will be called simply “coupler”.
- FIG. 1 schematizes an OMT termed "linear polarization separator", which is produced using the technique of microwave waveguides.
- This OMT referenced 1, essentially comprises a first port 2 intended to be connected to a horn facing a microwave telecommunication antenna and two other ports 3, 4 intended to be connected to a transmitter or a receiver.
- This OMT only works with linear polarizations. These three ports are coaxial.
- Port 3 corresponds to the horizontal polarization and port 4 to the vertical polarization.
- Port 3 is rectangular and is connected to port 2 by one or more waveguide sections 5 having dimensions intermediate between those of ports 2 and 3.
- Port 4 is radially connected to port 2 by two guide sections of FIG. 6A, 6B waves arranged symmetrically with respect to the common axis of the three ports and each having approximately an elongated "U" shape and resulting in diametrically opposite coupling slots of each of the ports 2 and 3.
- the coupler 7 of FIG. 2 is a so-called "pyramidal" OMT. It essentially comprises a central cavity with parallelepipedal body square section and a pyramid 8 placed at the bottom of this cavity. Ports 9 to 12 end facing the four lateral triangular surfaces of the pyramid of the parallelepiped body.
- the coupling of electromagnetic waves between the square section central port and the four ports can be broadband. This operating range can be affected or reduced with the use of a transition between the circular section ports and the OMT parallelepipedal body promoting the propagation higher order modes.
- this coupler does not have a multiplexing function.
- FIG. 3 shows a conventional OMT 13 with circular sections. It essentially comprises three sections of successive coaxial waveguides 14, 15 and 16 which are generally cavities.
- the first guide 14 has the largest diameter and has two or four rectangular coupling slots such as the slot 14A, only shown in the drawing, each associated with a port such as ports 14B shown in the drawing.
- the section 15, of smaller diameter than the section 14 has two or four coupling slots 15 each associated with a port 15B.
- the section 16, of smaller diameter than that of the section 15 constitutes the propagation port of the highest frequency band, while the section 14 ensures the coupling of the lowest frequencies and the section 15 that of the frequencies of the intermediate value.
- Such a coupler thus allows a multi-band coupling, but the widths of these bands are small.
- the coupler 17 of FIG. 4 is of the type comprising a cavity 18 in the shape of a rectangular parallelepiped extending along a parallelepipedic cavity with a square or rectangular section and a port 19 with a square or rectangular cross section and coaxial with the axis of the cavity.
- the cavity 18 has on each of its two (or four) side faces a coupling slot 18A associated with a coupling port 18B.
- Such a coupler operates for a relatively wide frequency band, but the transition (not shown), serving as an interface to the connection of a circular section horn, and located between the square or rectangular section cavity 18 and the waveguides
- the circular section waves connected to it reduce its operating range because of the presence of higher order modes, including harmonics, which impede the propagation of useful signals.
- FIG. 5 schematizes an OMT 20 as known from US Pat. No. 6,566,976.
- This OMT comprises a conical body 21 connecting a port 22 with a circular section to a port 23 also having a circular section and having a diameter less than that of the port 22.
- Coupling slots 21 A associated with ports IB 2 are formed on the conical body 21.
- Such an OMT only propagates narrow frequency bands.
- the subject of the present invention is a multi-band broadband transmission-reception coupler of the OMT type for microwave telecommunications antennas which can operate for a very wide bandwidth (greater than one octave), for linear as well as circular polarizations.
- the coupler according to the invention comprises a port for propagation of all the frequencies, a body and a port for propagation of the high frequency bands, these three parts being coaxial and all having a circular section, coupling slots for the propagation of the low frequency bands being practiced in the body and each associated with a waveguide, and it is characterized in that its body joining the two ports comprises at least one section comprising a coupling section and a blocking section low frequencies, that is to say coupled frequencies, and has a form of revolution whose profile evolves according to a multi-polynomial law, constantly decreasing from the port of larger section to the port of smaller section, each coupling section having two or four broadband coupling slots.
- the coupling slots allow, after recombination, operation in linear and circular polarizations. If they are two in number and diametrically opposed, it is a single linear polarization, and if they are four in number and arranged at 90 ° relative to each other, they are linear polarizations and circulars. In the coupling regime, all the signals coupled to the losses that are induced by the coupler itself and by the type of treatment of the machined material are recovered (for example: a silver-based finish allows very good conductivity).
- the blocking section also provides an adaptation function allowing the propagation of high frequencies therethrough, on the other hand it also assists in the overall adaptation of the coupler (between ports P1 and P2).
- FIGS. 1 to 5 are simplified diagrams of known couplers
- FIGS. 6 to 8 are simplified diagrams of three embodiments of a coupler according to the present invention.
- the present invention is described below with reference to three simple examples of couplers, but it is understood that it is not limited to these examples and that the bodies of these couplers may have a large number of other profiles, these profiles are generally defined as evolving according to a multi-polynomial law, constantly decreasing from the port of greater section to the port of pi us small secti on.
- All the couplers according to the invention described below mainly comprise the following elements: a first port P1 followed by a body and a second port P2, these three main elements all having a circular section and being coaxial.
- the inner diameter of the port P1 is greater than that of the port P2, while the inner diameter of the coupling section is equal to that of the port P1 at their junction and decreases constantly between its junction with P1 and its junction with P2.
- the body comprises at least one section consisting of a coupling section and a frequency blocking section relating to the coupling section of the same assembly.
- the embodiments described herein each include only one such section, but it is understood that the invention is not limited to a single section, and that the coupler of the invention has as many such sections that There are intermediate frequency bands to be processed (in coupling and separation).
- the profile of the blocking section may comprise one or more parties with different evolution laws.
- the port Pl ensures the propagation of all the useful bandwidths (representing the coupling of low and high subbands) and is connected (not shown) to a horn propagating in transmission and in reception of the electromagnetic waves in association with a focusing system such as a microwave telecommunications antenna, while the P2 port only ensures the propagation of high sub-bands and the coupling ports of the coupling section ensure that of the sub-bands bass.
- the P2 port and the ports of the link section are connected (from not shown) to transceiver systems.
- the law of evolution of the longitudinal profile of each coupling section is an essential element of the invention and will be described in detail below for each of the embodiments shown. Note that the coupling section may have only two or four coupling slots, because a different number would be useless purely and simply.
- the examples of coupling section profiles described below are simple to perform by machining, whether they are linear or defined by splines.
- the body 24 of the coupler 25 of FIG. 6 has a profile consisting of two consecutive linear parts 26 (determining the coupling section) and 27 (determining the low frequency blocking section) with different slopes (the slopes are to be considered in FIG. the plane of the figure, with respect to the longitudinal axis of the coupler). It is understood that this profile may comprise more than two parts with different slopes. In the example shown in the drawing, the slope of the portion 26 is greater than that of the portion 27, but the opposite is also possible
- Each section of the separator favors the coupling of the low bands by presenting a slope of angle ⁇ l (slope 26) of approximately 10 to 15 ° and the following section of slope of angle ⁇ 2 (slope 27) bypasses (prevents) these same low bands to propagate through the coupler.
- the whole also favoring a good adaptation (in terms of ROS, that is to say stationary wave rates) of the overall coupler for all frequency bands to propagate and separate.
- Broadband rectangular 24A coupling slots are formed in the body of the section 24.
- Each slots extend parallel to the longitudinal axis of the section 24. In this case, there are two or four. Two slots are used to couple at least one linear polarization and four slots are used to couple two linear polarizations and two circular polarizations. A recombination system (not shown) is necessary for their restitution. Only one of these slots is visible on the drawing.
- Each slots is associated with a waveguide 24B rectangular section. Each set of coupling slot and associated waveguide is referred to herein as "coupling arm". The dimensions of the coupling slots are initially determined as those of a conventional rectangular waveguide to allow the propagation of the lowest frequencies to be coupled.
- one or more conventional filtering cells intended for eliminate any residual frequencies that would be outside the bandwidth to be coupled relative to the arms 24B and which must pass only longitudinally through the section 24.
- the equation defining the spline 30 can have various forms provided that, as specified above, the diameter of the corresponding portion of the section 28 is constantly decreasing from the port of larger section to the port of smaller section, or more precisely to the junction with the part defined by profile 31.
- the coupler 32 of FIG. 8 comprises a coupling section 33, the profile of which consists of two different successive splines 34, 35 each satisfying the same conditions as the spline 30 of FIG. 7. It is understood that the profile of the section of FIG. coupling of the coupler of the invention may have more than two splines.
- the number of splines results from the sizes of the bandwidths to be coupled (percentage of relative band), the number of bandwidths to be coupled and their frequency distance from each other.
- the possibility of mechanically making the coupler can also limit this number of splines: a compromise will then be necessary. For example, a sine squared function was used to define the spline in a coupler made to couple the L band and separate the C and Ku bands.
- This spline defined a zone of short-circuit favoring the coupling of the low bands (L) and a good adaptation of the bands more high (C and Ku) propagating through the coupler.
- the spline 34 providing the coupling was a first order polynomial (linear profile).
- the coupler of the invention processes the broad Ku and Ka subbands both in transmission and in reception (coupling and separation function of the coupler), whether in linear polarization or in circular polarization, giving a total of four subbands, as follows.
- the transmitted frequency band ranges from 10.95 to 12.75 GHz and the received frequency band ranges from 13.75 to 14.5 GHz.
- Such a coupler can therefore be described as "very wide band", since the total frequency band covered (from 10.95 to 30 GHz) extends over more than one octave.
- the signals of the band Ka are circularly polarized (right and left in transmission and reception), and those of the Ku band are linearly polarized (orthogonal horizontal and vertical emission and reception).
- the entire Ku (transmit and receive) band passes through the four coupling arms of the coupling body and represents 27.9% of coupled relative band, while the Ka band crossing the coupler represents 51.6% of separate relative band .
- the percentage of relative band PBR is defined as follows:
- the distance between the low band (s) to be coupled and the high band (s) to be propagated through the splitter-splitter indicates whether the coupler is achievable. This frequency distance should not be too small, otherwise there is a risk of coupling also the beginning of the highest bands.
- the use of a selective filter microwave iris with circular contour of defined thickness having a cross-shaped recess, placed between the coupling section and the blocking section or just after the blocking section, can help in the where bandwidths to be coupled and separated are very close. This coupler makes it possible to use only one very broadband antenna for transmission (transmission and reception) of the four sub-bands.
Landscapes
- Waveguide Aerials (AREA)
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Waveguide Connection Structure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0706284A FR2920915B1 (en) | 2007-09-07 | 2007-09-07 | OMT TYPE BROADBAND MULTIBAND MULTIBAND TRANSCEIVER SEPARATOR - SEPARATOR FOR MICROWAVE TELECOMMUNICATIONS ANTENNAS. |
PCT/EP2008/061753 WO2009030737A1 (en) | 2007-09-07 | 2008-09-05 | Omt type broadband multiband transmission-reception coupler-separator for rf frequency telecommuncations antennas |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2195877A1 true EP2195877A1 (en) | 2010-06-16 |
EP2195877B1 EP2195877B1 (en) | 2013-05-29 |
Family
ID=39182985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08803722.1A Active EP2195877B1 (en) | 2007-09-07 | 2008-09-05 | Omt type broadband multiband transmission-reception coupler-separator for rf frequency telecommuncations antennas |
Country Status (10)
Country | Link |
---|---|
US (1) | US8508312B2 (en) |
EP (1) | EP2195877B1 (en) |
JP (1) | JP5716248B2 (en) |
KR (1) | KR101489538B1 (en) |
CN (1) | CN101689691B (en) |
CA (1) | CA2696279C (en) |
ES (1) | ES2422604T3 (en) |
FR (1) | FR2920915B1 (en) |
RU (1) | RU2497242C2 (en) |
WO (1) | WO2009030737A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009051370A1 (en) * | 2009-06-04 | 2010-12-09 | Rohde & Schwarz Gmbh & Co Kg | Measuring coupler in stripline technology |
EP2454780B1 (en) * | 2009-07-13 | 2015-12-16 | Indian Space Research Organisation | Symmetrical branching ortho mode transducer (omt) with enhanced bandwidth |
US9653766B2 (en) * | 2013-01-11 | 2017-05-16 | Thrane & Thrane A/S | Polarizer and a method of operating the polarizer |
KR101514155B1 (en) * | 2013-12-24 | 2015-04-21 | 단국대학교 천안캠퍼스 산학협력단 | Waveguide diplexer |
CN103956548B (en) * | 2014-05-23 | 2016-03-23 | 成都赛纳赛德科技有限公司 | E face channel-splitting filter |
US9401536B2 (en) * | 2014-11-12 | 2016-07-26 | Ayecka Communication Systems | Dual band antenna configuration |
FR3030907B1 (en) | 2014-12-19 | 2016-12-23 | Thales Sa | ORTHOGONAL MODE JUNCTION COUPLER AND POLARIZATION AND FREQUENCY SEPARATOR THEREFOR |
WO2019191917A1 (en) | 2018-04-04 | 2019-10-10 | 华为技术有限公司 | Omt component and omt apparatus |
EP3595082B8 (en) * | 2018-07-10 | 2020-11-04 | Rohde & Schwarz GmbH & Co. KG | Integrated device and manufacturing method thereof |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
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IT946090B (en) * | 1971-11-24 | 1973-05-21 | Siemens Spa Italiana | SIGNAL EXTRACTION CIRCUIT ERROR POINTING A MICROWAVE ANTENNA TOWARDS A MOBILE TARGET |
US4052724A (en) * | 1974-12-20 | 1977-10-04 | Mitsubishi Denki Kabushiki Kaisha | Branching filter |
JPS6058702A (en) * | 1983-09-09 | 1985-04-04 | Mitsubishi Electric Corp | Branching filter |
CA1260609A (en) * | 1986-09-12 | 1989-09-26 | Her Majesty The Queen, In Right Of Canada, As Represented By The Minister Of National Defence | Wide bandwidth multiband feed system with polarization diversity |
US4937533A (en) * | 1989-08-16 | 1990-06-26 | Rockwell International Corporation | Deformable diplexer filter signal coupling element apparatus |
RU2075801C1 (en) * | 1993-06-08 | 1997-03-20 | Новосибирский электротехнический институт связи им.Н.Д.Псурцева | Device for integration of incoherent signals |
RU2081481C1 (en) * | 1993-07-01 | 1997-06-10 | Ростовский научно-исследовательский институт радиосвязи | Frequency-selective shf matrix |
DE69530810T2 (en) * | 1994-03-21 | 2004-04-01 | Hughes Electronics Corp., El Segundo | Simplified tracking antenna |
US5784033A (en) * | 1996-06-07 | 1998-07-21 | Hughes Electronics Corporation | Plural frequency antenna feed |
JPH11145701A (en) * | 1997-11-13 | 1999-05-28 | Nec Corp | Orthogonal polarization coupler |
RU2150770C1 (en) * | 1998-11-02 | 2000-06-10 | Кисляков Юрий Вячеславович | Multiplexer |
KR100314819B1 (en) * | 1999-10-06 | 2001-11-30 | 임학규 | Orthogonal mode transducer for Ka-band |
US6313714B1 (en) * | 1999-10-15 | 2001-11-06 | Trw Inc. | Waveguide coupler |
US6657516B1 (en) * | 2000-01-31 | 2003-12-02 | Northrop Grumman Corporation | Wideband TE11 mode coaxial turnstile junction |
US6566976B2 (en) | 2001-06-12 | 2003-05-20 | Northrop Grumman Corporation | Symmetric orthomode coupler for cellular application |
CN1158537C (en) * | 2002-08-06 | 2004-07-21 | 东南大学 | Heterodyne millimetric wave space electricity-feeding transmission method and its focal array imaging structure |
US7432780B2 (en) * | 2005-11-23 | 2008-10-07 | Northrop Grumman Corporation | Rectangular-to-circular mode power combiner/divider |
-
2007
- 2007-09-07 FR FR0706284A patent/FR2920915B1/en active Active
-
2008
- 2008-09-05 RU RU2010100973/07A patent/RU2497242C2/en active
- 2008-09-05 JP JP2010523507A patent/JP5716248B2/en active Active
- 2008-09-05 KR KR1020107003010A patent/KR101489538B1/en active IP Right Grant
- 2008-09-05 EP EP08803722.1A patent/EP2195877B1/en active Active
- 2008-09-05 ES ES08803722T patent/ES2422604T3/en active Active
- 2008-09-05 CA CA2696279A patent/CA2696279C/en active Active
- 2008-09-05 US US12/676,507 patent/US8508312B2/en active Active
- 2008-09-05 WO PCT/EP2008/061753 patent/WO2009030737A1/en active Application Filing
- 2008-09-05 CN CN2008800238224A patent/CN101689691B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2009030737A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP5716248B2 (en) | 2015-05-13 |
KR20100063698A (en) | 2010-06-11 |
WO2009030737A1 (en) | 2009-03-12 |
CA2696279A1 (en) | 2009-03-12 |
CA2696279C (en) | 2015-04-14 |
FR2920915A1 (en) | 2009-03-13 |
FR2920915B1 (en) | 2009-10-23 |
RU2010100973A (en) | 2011-07-20 |
ES2422604T3 (en) | 2013-09-12 |
CN101689691A (en) | 2010-03-31 |
KR101489538B1 (en) | 2015-02-03 |
US20100207702A1 (en) | 2010-08-19 |
EP2195877B1 (en) | 2013-05-29 |
JP2010538559A (en) | 2010-12-09 |
CN101689691B (en) | 2012-10-31 |
US8508312B2 (en) | 2013-08-13 |
RU2497242C2 (en) | 2013-10-27 |
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