WO2005029719A2 - Terminal utilisateur bi-directionnel de large diffusion à fréquences d'émission configurables - Google Patents
Terminal utilisateur bi-directionnel de large diffusion à fréquences d'émission configurables Download PDFInfo
- Publication number
- WO2005029719A2 WO2005029719A2 PCT/FR2004/050429 FR2004050429W WO2005029719A2 WO 2005029719 A2 WO2005029719 A2 WO 2005029719A2 FR 2004050429 W FR2004050429 W FR 2004050429W WO 2005029719 A2 WO2005029719 A2 WO 2005029719A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cover
- frequency
- local oscillator
- outdoor unit
- band
- Prior art date
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
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
Definitions
- the invention relates to a bi-directional user terminal with configurable transmission frequencies, in particular to a satellite terminal with return channel capable of operating in a frequency band such as the Ku, Ka or other bands.
- a frequency band such as the Ku, Ka or other bands.
- the present invention will be described with reference to a bidirectional terminal operating in Ka band.
- FIG. 1 illustrates an example of a conventional architecture of a frequency transposition circuit or BUC (Block Up Conversion) in Ka band placed in an outdoor unit (or ODU for “Outdoor Unit”) of transmission.
- the RF signal at an intermediate frequency IF in the 0.95-1.45GHz band comes from the indoor unit (or IDU for "indoor unit”) and is transposed into the Ka band by using a subharmonic mixer (X2) and a local oscillator (hereinafter OL) operating in the Ku band.
- X2 subharmonic mixer
- OL local oscillator
- the output of mixer X2 is sent to a bandpass filter 1. Indeed, very selective bandpass filtering is necessary to eliminate in particular the residual component in Ka band (2 * OL) and which is at twice the frequency of the local oscillator, which must not be radiated by the terminal.
- the output of the filter 1 is sent to an amplifier 2, the output of which is connected to, the source 3 of an antenna 4.
- the emission bands correspond to frequencies of the local oscillator OL of the BUC, of 13,725 GHz and 14,275 GHz respectively.
- the annoying components to be filtered corresponding to 2OL are then 27.45 and 28.55 GHz.
- Figure 2 which illustrates the frequency plans.
- This return channel comprises: - a local oscillator supplying a signal having a frequency selectable from at least two frequencies, - a transposition means which transposes a signal to be transmitted using the signal supplied by the local oscillator, - a broadband filtering means which lets pass the signals whose frequency corresponds to the transposed signal independently of the frequency of the local oscillator, and a waveguide element having a cover which depends on the frequency selected for the oscillator local.
- the cover of the waveguide transforms the waveguide into a band rejector filter which rejects a band corresponding to a leakage of the transposition frequency in the wide band.
- the cover is either a flat cover, or a cover including resonant cavities coupled by slot.
- the waveguide comprises resonant cavities coupled by slot, and the cover is either a flat cover, or a cover comprising elements which electrically block the slots.
- FIG. 4 represents the perspective configuration of a conventional band stop filter
- FIGS. 5a and 5b schematically represent a first embodiment of the present invention
- FIGS. 6a and 6b schematically represent a second embodiment of the present invention
- FIG. 7 illustrates the transmission frequency plans corresponding to the invention.
- FIG. 3 illustrates the radio architecture of a BUC according to the present invention in the case of a bi-directional terminal operating in Ka band.
- the proposed BUC is capable of covering the two aforementioned frequency bands, namely 28.4-28.6GHz and 29.5-30 GHz.
- the BUC implements broadband pass band filtering covering the two frequency bands, namely 28.4-30 GHz, and capable of rejecting the frequency at 2 * OL lowest (corresponding to the low band BB).
- the return channel to the BUC in FIG. 3 therefore comprises a harmonic mixer X2 receiving respectively as an input the RF signal at the intermediate frequency IF in the band 0.95-1.45 GHz and the signal from a local oscillator 10, the oscillation frequency OL of which is adjustable to 13,725 GHz or 14,275 GHz depending on the high or low operating band chosen.
- the output of the mixer X2 is sent to a bandpass filter 11 covering the two bands, namely 28.4-30 GHz, in the embodiment shown.
- the output of the bandpass filter 11 is sent to a rejector filter 12.
- the rejector filter 12 is a configurable filter and is capable of effectively rejecting the frequency at 2 * highest OL (corresponding to the high band BH).
- the rejector filter 12 is, for example, a waveguide rejector filter which can be easily connected to a bandpass filter which itself has guide ports.
- the rejector filter 12 is connected to the source of the antenna 4.
- An example of a rejector filter or band stop filter is shown in FIG. 4a.
- it is a three-pole filter, namely a rectangular waveguide 20 coupled by slots 21 with three resonant cavities 22 tuned to the frequency to be rejected.
- the resonant cavities 20 which form resonant elements LC have a length substantially equal to ⁇ g / 2 where ⁇ g is the guided wavelength calculated at the rejection frequency.
- the cavities are coupled to the main guide by inductive slots 21.
- the distance between two slots is preferably equal to 3 ⁇ g / 4 to avoid coupling effects between the slots, although theoretically it could be ⁇ g / 4.
- the terminal thus described can be very simply configured by modifying the frequency of the local oscillator 10 and by activating / deactivating the rejector filter 12.
- the modification of the frequency of the local oscillator 10 is done, for example, mechanically. '' by action on a switch accessible by the operator.
- the modification of the frequency of the local oscillator can also be done via the indoor unit or IDU which then controls the external unit or ODU by a bus of the Disecq type for example. It is considered that the rejector filter is an integral part of the source (feed) of the antenna, so that the additional cost provided by this function remains minimal.
- the first embodiment represented in FIGS. 5a and 5b, consists of structure guided 30 whose cover 31 is flat if no band stop filtering is required, as shown in FIG. 5a. Otherwise, this cover is replaced by a cover 32 which contains the coupling slots 33 as well as the resonant cavities 34, as shown in FIG. 5b.
- the second embodiment shown in Figures 6a and
- This scalable terminal can be easily configured by the user without the intervention of a professional, thanks to a manual switch (or automatic controlled by the IDU) and by a modification of the filtering by changing the cover of a waveguide.
- This system significantly reduces the installation cost.
- this technique can be extended to any other multi-band transmission device.
- the present invention has been described with reference to a terminal operating in Ka band with a rejector filter constituted by a rectangular 3-pole waveguide, it is obvious to those skilled in the art that it can be used in terminals operating in other bands and with different waveguide rejector filters.
- the present invention can also be implemented in high-frequency multi-band user terminals for applications of the MMDS (Microwave Multipoint Distribution System) type operating in the 40 GHz bands.
- MMDS Microwave Multipoint Distribution System
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602004010157T DE602004010157T2 (de) | 2003-09-18 | 2004-09-13 | Bidirektionales BREITVERTEILUNGS-BENUTZERENDGERÄT MIT KONFIGURIERBAREN AUSSTRAHLUNGSFREQUENZEN |
US10/572,089 US7697888B2 (en) | 2003-09-18 | 2004-09-13 | Broad distribution bi-directional user terminal at configurable broadcast frequencies |
EP04816196A EP1665551B1 (fr) | 2003-09-18 | 2004-09-13 | Terminal utilisateur bi-directionnel de large diffusion a frequences d'emission configurables |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03292300.5 | 2003-09-18 | ||
EP03292300 | 2003-09-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005029719A2 true WO2005029719A2 (fr) | 2005-03-31 |
WO2005029719A3 WO2005029719A3 (fr) | 2005-06-02 |
Family
ID=34354601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2004/050429 WO2005029719A2 (fr) | 2003-09-18 | 2004-09-13 | Terminal utilisateur bi-directionnel de large diffusion à fréquences d'émission configurables |
Country Status (4)
Country | Link |
---|---|
US (1) | US7697888B2 (fr) |
EP (1) | EP1665551B1 (fr) |
DE (1) | DE602004010157T2 (fr) |
WO (1) | WO2005029719A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10297920B2 (en) * | 2017-02-16 | 2019-05-21 | Lockheed Martin Corporation | Compact dual circular polarization multi-band waveguide feed network |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0473076A1 (fr) * | 1990-08-27 | 1992-03-04 | Alcatel Telspace | Filtre hyperfréquence à accès latéral |
WO2000003494A2 (fr) * | 1998-07-09 | 2000-01-20 | Act Wireless | Terminal de reseau satellitaire |
US6366620B1 (en) * | 1994-12-13 | 2002-04-02 | Hughes Electronics Corporation | VSAT system |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE473076C (de) | 1929-03-09 | Franz Bienefeld | Maschine zum selbsttaetigen Verschliessen von Flaschen durch Kappen aus Weichmetall | |
US6177964B1 (en) * | 1997-08-01 | 2001-01-23 | Microtune, Inc. | Broadband integrated television tuner |
JP3476351B2 (ja) * | 1997-11-27 | 2003-12-10 | シャープ株式会社 | 低雑音増幅装置 |
JP4378835B2 (ja) * | 2000-04-10 | 2009-12-09 | パナソニック株式会社 | マイクロ波発振回路と衛星受信ダウンコンバータ |
US7065326B2 (en) * | 2001-05-02 | 2006-06-20 | Trex Enterprises Corporation | Millimeter wave communications system with a high performance modulator circuit |
JP2003143028A (ja) * | 2001-11-01 | 2003-05-16 | Sharp Corp | 低雑音コンバータ |
US20030152140A1 (en) * | 2002-01-10 | 2003-08-14 | Xxtrans, Inc. | System and method for transmitting/receiving telemetry control signals with if payload data on common cable between indoor and outdoor units |
AU2003216700A1 (en) * | 2002-03-28 | 2003-10-13 | Farran Technology Limited | "an upconverter" |
US6745020B2 (en) * | 2002-08-29 | 2004-06-01 | Eugene Rzyski | Direct downconversion receiver |
US7076201B2 (en) * | 2002-09-05 | 2006-07-11 | Xytrans, Inc. | Low cost VSAT MMIC transceiver with automatic power control |
JP3923405B2 (ja) * | 2002-10-09 | 2007-05-30 | シャープ株式会社 | 低雑音コンバータ |
US7050765B2 (en) * | 2003-01-08 | 2006-05-23 | Xytrans, Inc. | Highly integrated microwave outdoor unit (ODU) |
-
2004
- 2004-09-13 EP EP04816196A patent/EP1665551B1/fr not_active Expired - Fee Related
- 2004-09-13 US US10/572,089 patent/US7697888B2/en not_active Expired - Fee Related
- 2004-09-13 DE DE602004010157T patent/DE602004010157T2/de active Active
- 2004-09-13 WO PCT/FR2004/050429 patent/WO2005029719A2/fr active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0473076A1 (fr) * | 1990-08-27 | 1992-03-04 | Alcatel Telspace | Filtre hyperfréquence à accès latéral |
US6366620B1 (en) * | 1994-12-13 | 2002-04-02 | Hughes Electronics Corporation | VSAT system |
WO2000003494A2 (fr) * | 1998-07-09 | 2000-01-20 | Act Wireless | Terminal de reseau satellitaire |
Non-Patent Citations (1)
Title |
---|
KIRILENKO A ET AL INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "HARMONIC REJECTION FILTERS FOR THE DOMINANT AND THE HIGHER WAVEGUIDE MODES BASED ON THE SLOTTED STRIPS" 2002 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST.(IMS 2002). SEATTLE, WA, JUNE 2 - 7, 2002, IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 3, 2 juin 2002 (2002-06-02), pages 373-376, XP001099506 ISBN: 0-7803-7239-5 * |
Also Published As
Publication number | Publication date |
---|---|
DE602004010157D1 (de) | 2007-12-27 |
DE602004010157T2 (de) | 2008-10-30 |
EP1665551A2 (fr) | 2006-06-07 |
US7697888B2 (en) | 2010-04-13 |
WO2005029719A3 (fr) | 2005-06-02 |
EP1665551B1 (fr) | 2007-11-14 |
US20070032190A1 (en) | 2007-02-08 |
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