WO2009118519A1 - Filtre de guide d'onde - Google Patents

Filtre de guide d'onde Download PDF

Info

Publication number
WO2009118519A1
WO2009118519A1 PCT/GB2009/000780 GB2009000780W WO2009118519A1 WO 2009118519 A1 WO2009118519 A1 WO 2009118519A1 GB 2009000780 W GB2009000780 W GB 2009000780W WO 2009118519 A1 WO2009118519 A1 WO 2009118519A1
Authority
WO
WIPO (PCT)
Prior art keywords
waveguide
filter
cast
probe
lnb
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.)
Ceased
Application number
PCT/GB2009/000780
Other languages
English (en)
Inventor
Stephen Flynn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASC UK SIGNAL Corp Ltd
Original Assignee
ASC UK SIGNAL Corp Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ASC UK SIGNAL Corp Ltd filed Critical ASC UK SIGNAL Corp Ltd
Priority to EP09724666A priority Critical patent/EP2260535A1/fr
Publication of WO2009118519A1 publication Critical patent/WO2009118519A1/fr
Anticipated expiration legal-status Critical
Priority to US13/090,040 priority patent/US20120075041A1/en
Ceased legal-status Critical Current

Links

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
    • H01P1/207—Hollow waveguide filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides

Definitions

  • the present invention relates particularly, but not exclusively, to a filter for use with a waveguide which is used in a low-noise block (LNB) for use with satellite communication systems.
  • LNBs are in widespread use.
  • An LNB typically consists of a waveguide with a waveguide horn directed to receive polarised electromagnetic radiation signals.
  • the waveguide is typically cast from metal and contains at least one probe for collecting incident electromagnetic radiation, which can be linearly or circularly polarised.
  • the probe passes through the waveguide wall and is typically connected to a circuit board where the electrical signals are processed before being passed to a receiver.
  • a waveguide with a probe detection system is disclosed in published International Application WO92/22938 in the name Cambridge Computer Limited.
  • VSAT systems there is a requirement to transmit and to receive frequencies in the same waveguide and there is a transmit band present that can interfere with the receive band which could cause reception problems.
  • the electronics of a VSAT system as shown in Fig. 1 will usually comprise a transmitter 1 , an LNB 2, a transmit reject filter 3, an orthogonal transducer 4 or diplexer and a feed horn 5. Even with the transmit reject filter, the LNB still needs to be immune or resistant to the residual transmit signal. Rejection of the interfering part of the transmit band is desired and this has been attempted using a waveguide filter created by inserting multiple screws in the waveguide or a pressed metal insert. These attempts to provide a filter require extra component parts which add extra LNB/waveguide manufacturing and testing steps leading to increased cost.
  • An object of the present invention is to obviate or mitigate at least one of the aforementioned disadvantages of existing waveguide filters. This is achieved by casting a filter into the waveguide wall at the same time as the waveguide is manufactured providing a waveguide filter with a consistent filtering performance and minimising manufacturing time and costs.
  • a waveguide for use with a VSAT LNB comprising: a waveguide housing having a waveguide wall for receiving electromagnetic radiation, the waveguide housing having a probe aperture receiving at least one probe for coupling the electromagnetic signal in the waveguide to an electrical signal in a circuit board, filter means cast into said waveguide wall for rejecting selected frequencies in a transmit band.
  • the filter means is cast in said waveguide wall adjacent to said probe aperture.
  • the filter means is dimensioned and proportioned to provide cancellation of a selected range of frequencies.
  • the filter means is a cast of generally cuboid shape disposed adjacent to a wall of said waveguide.
  • the filter means can be a solid cuboid block or a hollow cuboid block.
  • the filter means can be of any other suitable shape such as a rounded protrusion such as a quadrant.
  • the block is cast in the same material as the waveguide.
  • the cast block is dimensioned and proportioned to reject the unwanted 13.75 GHz to 14.5 GHz transmit frequency band or some part of it.
  • an LNB comprising a waveguide with a filter cast in a wall of said waveguide, said LNB having at least one probe in said waveguide disposed next to said filter means, said probe passing through said waveguide wall and a microstrip circuit coupled to said probe.
  • said VSAT system includes a waveguide horn.
  • the cast filter has a flat front face, spaced from, and a similar distance along the waveguide as said at least one probe.
  • said LNB is for use with a VSAT system and said filter means is dimensioned and proportioned to reject the unwanted 13.75 GHz to 14.5 GHz frequency band.
  • a method of manufacturing a waveguide for use with a VSAT system to minimise interference from an unwanted frequencies of transmit signals comprising: determining the dimensions and proportion of a waveguide filter, and casting the waveguide and the determined waveguide filter simultaneously.
  • FIG. 2 is a 3-D end view of a waveguide with a waveguide filter in accordance with a first embodiment of the invention
  • Fig. 3 is an enlarged end view of the actual waveguide showing the end face of the waveguide filter separated from the probe;
  • Fig. 4 is an enlarged, and partly cut away, view of the waveguide of Fig. 2 with the probe removed, depicted the waveguide wall cast with the filter;
  • Fig. 5 is a diagrammatic longitudinal sectional view through the waveguide of Fig. 2 showing the relative positioning of the front face of the waveguide and the probe;
  • Fig. 6 is a graph of insertion loss/response against frequency for the transmit and receive bands
  • Fig. 7 is an end view of a waveguide having a cast filter in accordance with a second embodiment of the invention.
  • the waveguide 10,12 is cast in a single manufacturing step with the rectangular waveguide 10 having four waveguide walls 10a,b,c and d, defining a waveguide interior 13.
  • Waveguide wall 10a is cast with a cuboid-shaped waveguide filter 14 which extends partway across the waveguide interior 13.
  • An aperture 16 is cast in waveguide surface 10d into which is inserted a probe 18 for receiving electromagnetic signals travelling in the waveguide 10.
  • the probe 18 is spaced from the filter 14 which is dimensioned and proportioned to reject unwanted frequencies in the band 13.75 GHz to 14.5 GHz.
  • Fig. 4 is a longitudinal sectional view through the waveguide 10 and showing two faces; a front face 14a substantially orthogonal to the longitudinal axis 11 and a side face 14b which is parallel to the waveguide axis 11.
  • the front face 14a and the probe aperture 16 are at substantially the same distance along the waveguide axis 11 so that when the probe 18 is inserted, as best seen in Fig. 5, the probe 18 and the front face 14a are also at a similar distance along the waveguide axis 11 , on plane 20.
  • This arrangement results in the filter in combination with the waveguide and probe rejecting the desired frequency range of signals from the transmit band.
  • Fig. 6 shows the insertion loss response against frequency and it will be seen that the 'notch' frequency response minimises the signal in the unwanted frequency range 13.75 GHz-14.5 GHz of at least 8dB at the band edges increasing to 38dB in the middle of the range. This rejection minimises interference with the receive signals and it will be seen from Fig. 6 that there is negligible effect on the receive frequency band of signals 10.7-12.75 GHz so that there is little loss incurred at the input of the LNB at the probe 18.
  • the filter can be dimensioned and proportioned so as to be cast in a different size to reject a desired range of frequencies.
  • the waveguide and filter may be cast in zinc or any other castable metal or in a polymer and then coated in a metal or conductive layer to provide an operational waveguide.
  • the waveguide and filter may be embodied in a circular or square waveguide with the filter also designed to reject a desired transmit frequency range.
  • the waveguide filter 14 could also take the form of a rounded protrusion such as a quadrant with modification to the length or may be replaced, as shown in Fig. 7, by two orthogonal walls parallel to the longitudinal axis 11 defining the outer faces 14e,14f of a hollow cuboid with the front face removed so that faces 14e,14f define an L-shape filter shown in end view.
  • the end of the waveguide and filter is a short-circuit 22.
  • the probe 18 and face 14a and ends of faces 14e,14f of the hollow cuboid do not need to be at exactly the same distance along the waveguide axis 11. They can be offset so long as the arrangement provides the desired rejection of the unwanted transmit frequencies.
  • the embodiment of the present invention provides advantages in that the cast filter which is integral with the waveguide provides a consistent filter performance across the desired range of frequencies, and it permits the waveguide and hence the LNB to be manufactured with fewer assembly steps thus minimising cost.

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Abstract

L'invention concerne un filtre destiné à être utilisé avec un guide d'onde qui fait partie d'une tête universelle (LNB) destinée à être utilisée avec des systèmes de communication par satellite VSAT. Le filtre est moulé dans la paroi du guide d'onde au moment de la fabrication du guide d'onde, ce qui permet d'obtenir un filtre de guide d'onde présentant des performances de filtrage homogènes.
PCT/GB2009/000780 2008-03-25 2009-03-24 Filtre de guide d'onde Ceased WO2009118519A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09724666A EP2260535A1 (fr) 2008-03-25 2009-03-24 Filtre de guide d'onde
US13/090,040 US20120075041A1 (en) 2008-03-25 2011-04-19 Waveguide filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0805310A GB0805310D0 (en) 2008-03-25 2008-03-25 Waveguide
GB0805310.0 2008-03-25

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US12934517 A-371-Of-International 2009-03-24
US13/090,040 Continuation US20120075041A1 (en) 2008-03-25 2011-04-19 Waveguide filter

Publications (1)

Publication Number Publication Date
WO2009118519A1 true WO2009118519A1 (fr) 2009-10-01

Family

ID=39386622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/000780 Ceased WO2009118519A1 (fr) 2008-03-25 2009-03-24 Filtre de guide d'onde

Country Status (3)

Country Link
EP (1) EP2260535A1 (fr)
GB (1) GB0805310D0 (fr)
WO (1) WO2009118519A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI629829B (zh) * 2016-08-11 2018-07-11 台揚科技股份有限公司 一種接收衛星信號之波導轉換結構

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110324A1 (fr) * 1982-11-30 1984-06-13 Kabushiki Kaisha Toshiba Récepteur à hyperfréquences comportant un filtre à guide d'ondes
JPH0758519A (ja) * 1993-08-19 1995-03-03 Nec Eng Ltd 分波器
US6041219A (en) * 1998-10-01 2000-03-21 Wytec, Incorporated Integrated orthogonal mode transducer/filter design for microwave frequency-domain
EP1233471A2 (fr) * 2001-02-19 2002-08-21 Alps Electric Co., Ltd. Guide d' ondes pour dispositif à micro-ondes
EP1443589A1 (fr) * 2003-01-31 2004-08-04 Thomson Licensing S.A. Transition entre un circuit à microbande et un guide d'ondes et élément de transmission/réception extérieur l'utilisant
US20070296518A1 (en) * 2006-06-27 2007-12-27 Andrew Corporation Cross-Polar and Co-Polar Transceiver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110324A1 (fr) * 1982-11-30 1984-06-13 Kabushiki Kaisha Toshiba Récepteur à hyperfréquences comportant un filtre à guide d'ondes
JPH0758519A (ja) * 1993-08-19 1995-03-03 Nec Eng Ltd 分波器
US6041219A (en) * 1998-10-01 2000-03-21 Wytec, Incorporated Integrated orthogonal mode transducer/filter design for microwave frequency-domain
EP1233471A2 (fr) * 2001-02-19 2002-08-21 Alps Electric Co., Ltd. Guide d' ondes pour dispositif à micro-ondes
EP1443589A1 (fr) * 2003-01-31 2004-08-04 Thomson Licensing S.A. Transition entre un circuit à microbande et un guide d'ondes et élément de transmission/réception extérieur l'utilisant
US20070296518A1 (en) * 2006-06-27 2007-12-27 Andrew Corporation Cross-Polar and Co-Polar Transceiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI629829B (zh) * 2016-08-11 2018-07-11 台揚科技股份有限公司 一種接收衛星信號之波導轉換結構

Also Published As

Publication number Publication date
EP2260535A1 (fr) 2010-12-15
GB0805310D0 (en) 2008-04-30

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