EP1665551B1 - Broad distribution bi-directional user terminal at configurable broadcast frequencies - Google Patents

Broad distribution bi-directional user terminal at configurable broadcast frequencies Download PDF

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Publication number
EP1665551B1
EP1665551B1 EP04816196A EP04816196A EP1665551B1 EP 1665551 B1 EP1665551 B1 EP 1665551B1 EP 04816196 A EP04816196 A EP 04816196A EP 04816196 A EP04816196 A EP 04816196A EP 1665551 B1 EP1665551 B1 EP 1665551B1
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EP
European Patent Office
Prior art keywords
frequency
cover
local oscillator
outdoor unit
waveguide
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EP04816196A
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German (de)
French (fr)
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EP1665551A2 (en
Inventor
Jean-Yves Le Naour
Dominique Lo Hine Tong
Philippe Chambelin
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Thomson Licensing SAS
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Thomson Licensing SAS
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    • 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 path capable of operating in a frequency band such as the Ku, Ka or other bands.
  • the present invention will be described with reference to a bi-directional terminal operating in Ka-band.
  • Figure 1 illustrates an example of a conventional architecture of a frequency conversion circuit or BUC (Block Up Conversion) Ka band placed in an outdoor unit (or ODU for "Outdoor Unit") transmission.
  • the RF signal at an IF intermediate frequency in the band 0.95-1.45GHz is derived from the indoor unit (or IDU for "indoor unit") and is transposed to Ka band using a subharmonic mixer (X2) and a local oscillator (hereinafter OL) operating in Ku band.
  • X2 subharmonic mixer
  • OL local oscillator
  • the output of the mixer X2 is sent on a band-pass filter 1.
  • a very selective band pass filtering is necessary to eliminate in particular the Ka-band residual component (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 whose output is connected to the source 3 of an antenna 4.
  • the operators wish a Ka-band application with a broadband transmission selectable in two frequency bands, for example the band 28.4-28.6 GHz and the band 29.5-30 GHz, one or the other frequency bands being allocated to the user according to his need and / or his geographical location.
  • the transmission bands correspond to frequencies of the local oscillator OL of the BUC, respectively 13.725 GHz and 14.275 GHz.
  • the troublesome components to be filtered corresponding to 2 * OL are then 27.45 and 28.55 GHz. As shown in FIG.
  • the document WO 00/03494 describes an external unit of a receiving terminal including a return channel, the return channel comprising a local oscillator, transposition means using the signal provided by the local oscillator and a waveguide element.
  • the invention therefore proposes an evolutionary product capable of covering several bands or sub-bands, the configuration of which is easy and can be done on site without the intervention of a professional in order to significantly reduce installation costs.
  • the invention proposes a single type of terminal for covering the different bands, which is of significant economic interest.
  • the minimization of industrialization costs and the increase in production volumes make it possible to reduce terminal costs.
  • the same product can be used by several operators.
  • the cover of the waveguide transforms the waveguide into a band rejection filter which rejects a band corresponding to a leak of the transposition frequency in the broadband.
  • the cover is either a flat cover or a cover including slot-coupled resonant cavities.
  • the waveguide comprises resonant cavities coupled by slot
  • the cover is either a flat cover or a cover having elements electrically plugging the slots.
  • FIG. 3 illustrates the radio architecture of a BUC according to the present invention in the case of a two-way terminal operating in Ka-band.
  • the proposed BUC is capable of covering the two aforementioned frequency bands, namely 28.4-28.6 GHz and 29.5-30 GHz.
  • the BUC implements a broadband bandpass filtering covering the two frequency bands, namely 28.4-30 GHz, and capable of rejecting the frequency at 2 * OL the lowest (corresponding to the low band BB).
  • the return path at the BUC of FIG. 3 thus comprises a harmonic mixer X2 receiving respectively at the input the RF signal at the intermediate frequency IF in the band 0.95-1.45 GHz and the signal coming from a local oscillator 10 whose OL oscillation frequency is adjustable to 13.725 GHz or 14.275 GHz depending on the selected high or low operating band.
  • the output of the mixer X2 is sent on 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 rejection filter 12.
  • the rejector filter 12 is a configurable filter and is able to effectively reject the frequency at 2 * OL the highest (corresponding to the high band BH).
  • the rejector filter 12 is, for example, a waveguide rejector filter which can be easily connected to a band pass filter itself having guide ports.
  • the rejector filter 12 is connected to the source of the antenna 4.
  • FIG. 4a An example of a rejection filter or a stop-band filter is shown in FIG. 4a.
  • This is in this case a three-pole filter, namely a rectangular waveguide 20 coupled by slots 21 to three resonant cavities 22 tuned to the frequency to be rejected.
  • the resonant cavities 20 which form LC resonant elements 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 configured in a very simple manner 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 type Disecq for example.
  • rejection filter is an integral part of the source (feed) of the antenna, so that the extra cost provided by this function remains minimal.
  • the first embodiment shown in Figures 5a and 5b, consists of guided structure 30 whose cover 31 is flat if no stop-band filtering is required, as shown in Figure 5a. Otherwise, this cover is replaced by a cover 32 which contains the coupling slots 33 and the resonant cavities 34, as shown in Figure 5b.
  • the second embodiment shown in Figures 6a and 6b, consists of a guided structure 40 including the coupling slots 41 and the resonant cavities 42 but open on their upper part.
  • a non-filtering guide cover 43 comprises profiled elements 44 for closing the openings that are the slots 41 and the open cavities 42 as shown in Figure 6a.
  • the guide becomes filtering by simply fixing a flat cover 45 over the guided structure 40.
  • FIG. 7 illustrates the two frequency planes in FIG. 6b (low band and high band) with switching of the local oscillator at the frequency OL and activation / deactivation of a rejection filter at 28.55 GHz.
  • 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 a modification of the filtering by changing the cover of a waveguide.
  • This system significantly reduces the cost of installation. In the same concern to reduce terminal installation costs, 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 consisting of 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 rejection filters.
  • the present invention can also be implemented in high-frequency multi-band user terminals for MMDS (Microwave Multipoint Distribution System) applications operating in the 40GHz bands.
  • MMDS Microwave Multipoint Distribution System

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Abstract

The invention relates to an upgradeable product which can cover two sub-bands. The up-path of an external unit comprises a switchable oscillator, coupled to a waveguide, provided with a detachable cap which permits the conversion of said guide into a band rejection filter.

Description

L'invention se rapporte à un terminal utilisateur bi-directionnel à fréquences d'émission configurables, notamment à un terminal satellite avec voie de retour susceptible de fonctionner dans une bande de fréquence telle que les bandes Ku, Ka ou autre.The invention relates to a bi-directional user terminal with configurable transmission frequencies, in particular to a satellite terminal with return path capable of operating in a frequency band such as the Ku, Ka or other bands.

La présente invention sera décrite en se référant à un terminal bi-directionnel fonctionnant en bande Ka.The present invention will be described with reference to a bi-directional terminal operating in Ka-band.

Ainsi, la figure 1 illustre un exemple d'architecture classique d'un circuit de transposition de fréquences ou BUC (Block Up Conversion) en bande Ka placé dans une unité extérieure (ou ODU pour « Outdoor Unit ») de transmission. Le signal RF à une fréquence intermédiaire IF dans la bande 0.95-1.45GHz est issu de l'unité intérieure (ou IDU pour « indoor unit ») et est transposé en bande Ka en mettant en oeuvre un mélangeur sous-harmonique (X2) et un oscillateur local (ci-après OL) opérant en bande Ku. La sortie du mélangeur X2 est envoyée sur un filtre passe-bande 1. En effet, un filtrage passe bande très sélectif est nécessaire pour éliminer en particulier la composante résiduelle en bande Ka (2*OL) et qui se trouve à deux fois la fréquence de l'oscillateur local, qui ne doit pas être rayonnée par le terminal.Thus, Figure 1 illustrates an example of a conventional architecture of a frequency conversion circuit or BUC (Block Up Conversion) Ka band placed in an outdoor unit (or ODU for "Outdoor Unit") transmission. The RF signal at an IF intermediate frequency in the band 0.95-1.45GHz is derived from the indoor unit (or IDU for "indoor unit") and is transposed to Ka band using a subharmonic mixer (X2) and a local oscillator (hereinafter OL) operating in Ku band. The output of the mixer X2 is sent on a band-pass filter 1. Indeed, a very selective band pass filtering is necessary to eliminate in particular the Ka-band residual component (2 * OL) and which is at twice the frequency of the local oscillator, which must not be radiated by the terminal.

De manière connue, la sortie du filtre 1 est envoyée sur un amplificateur 2 dont la sortie est connecté à la source 3 d'une antenne 4.In known manner, the output of the filter 1 is sent to an amplifier 2 whose output is connected to the source 3 of an antenna 4.

Pour des raisons de mise en oeuvre, les opérateurs souhaitent une application en bande Ka avec une émission large bande sélectionnable dans deux bandes de fréquences, par exemple la bande 28.4-28.6GHz et la bande 29.5-30 GHz, l'une ou l'autre des bandes de fréquence étant affectée à l'utilisateur suivant son besoin et/ou sa situation géographique. Dans le cas d'un tel déploiement, les bandes d'émission correspondent à des fréquences de l'oscillateur local OL du BUC, respectivement de 13.725 GHz et 14.275 GHz. Les composantes gênantes à filtrer correspondant à 2*OL sont alors 27.45 et 28.55 GHz. Comme représenté sur la figure 2 qui illustre les plans de fréquence correspondant aux deux fréquences émises en bande Ka (respectivement en bande haute et en bande basse), les composantes 2*OL (28.55 GHz et 27,45 GHz) sont en dehors des plans. Une approche classiquement mise en oeuvre dans ce cas est de proposer deux types de terminaux distincts capables de couvrir l'une ou l'autre des bandes de fréquence, ceci au détriment du coût du terminal.For reasons of implementation, the operators wish a Ka-band application with a broadband transmission selectable in two frequency bands, for example the band 28.4-28.6 GHz and the band 29.5-30 GHz, one or the other frequency bands being allocated to the user according to his need and / or his geographical location. In the case of such a deployment, the transmission bands correspond to frequencies of the local oscillator OL of the BUC, respectively 13.725 GHz and 14.275 GHz. The troublesome components to be filtered corresponding to 2 * OL are then 27.45 and 28.55 GHz. As shown in FIG. 2 which illustrates the frequency planes corresponding to the two frequencies transmitted in the Ka band (respectively in the high band and in the low band), the 2 * OL components (28.55 GHz and 27.45 GHz) are outside the planes. . An approach conventionally implemented in this case is to propose two different types of terminals capable of covering one or the other of the frequency bands, this to the detriment of the cost of the terminal.

Le document WO 00/03494 décrit une unité extérieure d'un terminal de réception incluant une voie de retour, la voie de retour comportant un oscillateur local, on moyen de transposition à l'aide du signal fourni par l'oscillateur local et un élément en guide d'onde.The document WO 00/03494 describes an external unit of a receiving terminal including a return channel, the return channel comprising a local oscillator, transposition means using the signal provided by the local oscillator and a waveguide element.

L'invention propose donc un produit évolutif capable de couvrir plusieurs bandes ou sous bandes, dont la configuration est aisée et peut être faite sur site sans l'intervention d'un professionnel afin de réduire sensiblement les coûts d'installation.The invention therefore proposes an evolutionary product capable of covering several bands or sub-bands, the configuration of which is easy and can be done on site without the intervention of a professional in order to significantly reduce installation costs.

D'autre part, l'invention propose un seul type de terminal permettant de couvrir les différentes bandes, ce qui présente un intérêt économique important. De ce fait, la minimisation des coûts d'industrialisation et l'augmentation des volumes de production permettent de diminuer les coûts du terminal. De plus, un même produit peut être utilisé par plusieurs opérateurs.On the other hand, the invention proposes a single type of terminal for covering the different bands, which is of significant economic interest. As a result, the minimization of industrialization costs and the increase in production volumes make it possible to reduce terminal costs. In addition, the same product can be used by several operators.

L'invention concerne plus particulièrement une unité extérieure d'un terminal de réception incluant une voie de retour. Cette voie de retour (BUC) comporte :

  • un oscillateur local fournissant un signal ayant une fréquence sélectionnable parmi au moins deux fréquences,
  • un moyen de transposition qui transpose un signal à émettre à l'aide du signal fourni par l'oscillateur local,
  • un moyen de filtrage large bande qui laisse passer les signaux dont la fréquence correspond au signal transposé indépendamment de la fréquence de l'oscillateur local, et
un élément en guide d'onde ayant un capot qui dépend de la fréquence sélectionnée pour l'oscillateur local..The invention relates more particularly to an outdoor unit of a receiving terminal including a return path. This return path (BUC) comprises:
  • a local oscillator providing a signal having a selectable frequency among at least two frequencies,
  • transposition means which transposes a signal to be transmitted using the signal supplied by the local oscillator,
  • broadband filtering means which passes signals whose frequency corresponds to the transposed signal independently of the frequency of the local oscillator, and
a waveguide element having a hood that depends on the frequency selected for the local oscillator.

Selon une caractéristique de l'invention, le capot du guide d'onde transforme le guide d'onde en filtre réjecteur de bande qui rejette une bande correspondant à une fuite de la fréquence de transposition dans la large bande.According to one characteristic of the invention, the cover of the waveguide transforms the waveguide into a band rejection filter which rejects a band corresponding to a leak of the transposition frequency in the broadband.

Selon un premier mode de réalisation, le capot est soit un capot plat, soit un capot incluant des cavités résonantes couplées par fente.According to a first embodiment, the cover is either a flat cover or a cover including slot-coupled resonant cavities.

Selon un autre mode de réalisation, le guide d'onde comporte des cavités résonantes couplées par fente, et le capot est soit un capot plat, soit un capot comportant des éléments venant électriquement boucher les fentes.According to another embodiment, the waveguide comprises resonant cavities coupled by slot, and the cover is either a flat cover or a cover having elements electrically plugging the slots.

L'invention sera mieux comprise, et d'autres particularités et avantages apparaîtront à la lecture de la description qui va suivre, la description faisant référence aux dessins annexés parmi lesquels :

  • la figure 1 déjà décrite représente une architecture de BUC selon l'état de la technique, dans le cas d'un terminal fonctionnant en bande Ka.
  • la figure 2 déjà décrite représente les plans de fréquence d'émission d'un système utilisant deux sous-bandes, tel que décrit à la figure 1.
  • la figure 3 représente schématiquement un exemple de réalisation de l'invention,
  • la figure 4 représente la configuration en perspective d'un filtre stop bande classique,
  • les figures 5a et 5b représentent schématiquement un premier mode de réalisation de la présente invention,
  • les figures 6a et 6b représentent schématiquement un second mode de réalisation de la présente invention, et
  • la figure 7 illustre les plans de fréquence d'émission correspondant à l'invention.
The invention will be better understood, and other features and advantages will appear on reading the description which follows, the description referring to the appended drawings among which:
  • FIG. 1 already described represents a BUC architecture according to the state of the art, in the case of a terminal operating in Ka-band.
  • FIG. 2 already described represents the transmission frequency planes of a system using two subbands, as described in FIG.
  • FIG. 3 diagrammatically represents an exemplary embodiment of the invention,
  • 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, and
  • FIG. 7 illustrates the emission frequency planes corresponding to the invention.

La figure 3 illustre l'architecture radio d'un BUC conforme à la présente invention dans le cas d'un terminal bi-directionnel fonctionnant en bande Ka. Le BUC proposé est capable de couvrir les deux bandes de fréquence précitées, à savoir 28.4-28.6GHz et 29.5-30 GHz. Comme expliqué ci-après avec référence à la figure 7, le BUC met en oeuvre un filtrage passe bande large bande couvrant les deux bandes de fréquence, à savoir 28.4-30 GHz, et capable de rejeter la fréquence à 2*OL la plus basse (correspondant à la bande basse BB).FIG. 3 illustrates the radio architecture of a BUC according to the present invention in the case of a two-way terminal operating in Ka-band. The proposed BUC is capable of covering the two aforementioned frequency bands, namely 28.4-28.6 GHz and 29.5-30 GHz. As explained below with reference to FIG. 7, the BUC implements a broadband bandpass filtering covering the two frequency bands, namely 28.4-30 GHz, and capable of rejecting the frequency at 2 * OL the lowest (corresponding to the low band BB).

De manière plus spécifique, la voie de retour au BUC de la figure 3 comporte donc un mélangeur sous harmonique X2 recevant respectivement en entrée le signal RF à la fréquence intermédiaire IF dans la bande 0.95-1.45 GHz et le signal issu d'un oscillateur local 10 dont la fréquence d'oscillation OL est ajustable à 13.725 GHz ou 14.275 GHz en fonction de la bande de fonctionnement haute ou basse choisie.More specifically, the return path at the BUC of FIG. 3 thus comprises a harmonic mixer X2 receiving respectively at the input the RF signal at the intermediate frequency IF in the band 0.95-1.45 GHz and the signal coming from a local oscillator 10 whose OL oscillation frequency is adjustable to 13.725 GHz or 14.275 GHz depending on the selected high or low operating band.

La sortie du mélangeur X2 est envoyée sur un filtre passe-bande 11 couvrant les deux bandes, à savoir 28.4-30 GHz, dans le mode de réalisation représenté. La sortie du filtre passe-bande 11 est envoyée sur un filtre réjecteur 12. Conformément à l'invention, le filtre réjecteur 12 est un filtre configurable et est capable de rejeter efficacement la fréquence à 2*OL la plus haute (correspondant à la bande haute BH). Le filtre réjecteur 12 est, par exemple, un filtre réjecteur en guide d'onde qui peut être aisément raccordé à un filtre passe bande présentant lui-même des accès guide. Le filtre réjecteur 12 est connecté à la source de l'antenne 4.The output of the mixer X2 is sent on 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 rejection filter 12. In accordance with the invention, the rejector filter 12 is a configurable filter and is able to effectively reject the frequency at 2 * OL the highest (corresponding to the high band BH). The rejector filter 12 is, for example, a waveguide rejector filter which can be easily connected to a band pass filter itself having guide ports. The rejector filter 12 is connected to the source of the antenna 4.

Un exemple de filtre réjecteur ou filtre stop-bande est représenté sur la figure 4a. Il s'agit dans ce cas d'un filtre à trois pôles, à savoir d'un guide d'onde rectangulaire 20 couplé par des fentes 21 à trois cavités résonnantes 22 accordées sur la fréquence à rejeter. De manière plus spécifique, les cavités résonnantes 20 qui forment des éléments résonnants LC ont une longueur sensiblement égales à λg/2 où λg est la longueur d'onde guidée calculée à la fréquence de réjection. Les cavités sont couplées au guide principal par des fentes inductives 21. La distance entre deux fentes est égale, de préférence, à 3λg/4 pour éviter des effets de couplage entre les fentes, bien que théoriquement, elle pourrait être de λg/4.An example of a rejection filter or a stop-band filter is shown in FIG. 4a. This is in this case a three-pole filter, namely a rectangular waveguide 20 coupled by slots 21 to three resonant cavities 22 tuned to the frequency to be rejected. More specifically, the resonant cavities 20 which form LC resonant elements have a length substantially equal to λg / 2 where λg 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 3λg / 4 to avoid coupling effects between the slots, although theoretically it could be λg / 4.

Le terminal ainsi décrit peut être configuré de manière très simple en modifiant la fréquence de l'oscillateur local 10 et en activant /désactivant le filtre réjecteur 12. La modification de la fréquence de l'oscillateur local 10 se fait par exemple de manière 'mécanique' par action sur un interrupteur accessible par l'opérateur. En variante, la modification de la fréquence de l'oscillateur local peut aussi se faire par l'intermédiaire de l'unité intérieure ou IDU qui commande alors l'unité externe ou ODU par un bus de type Disecq par exemple.The terminal thus described can be configured in a very simple manner 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. Alternatively, 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 type Disecq for example.

On considère que le filtre réjecteur fait partie intégrante de la source (feed) de l'antenne, afin que le surcoût apporté par cette fonction reste minime. Pour activer ou désactiver un filtre réjecteur du type de celui représenté à la figure 4, à savoir pour rendre ce filtre configurable, deux modes de réalisation suivants sont possibles :It is considered that the rejection filter is an integral part of the source (feed) of the antenna, so that the extra cost provided by this function remains minimal. To activate or deactivate a rejection filter of the type shown in FIG. 4, namely to make this filter configurable, two following embodiments are possible:

Le premier mode de réalisation, représenté sur les figures 5a et 5b, consiste en structure guidée 30 dont le capot 31 est plat si aucun filtrage stop-bande n'est requis, comme représenté sur la figure 5a. Dans le cas contraire, ce capot est remplacé par un capot 32 qui contient les fentes 33 de couplage ainsi que les cavités résonnantes 34, comme représenté sur la figure 5b.The first embodiment, shown in Figures 5a and 5b, consists of guided structure 30 whose cover 31 is flat if no stop-band filtering is required, as shown in Figure 5a. Otherwise, this cover is replaced by a cover 32 which contains the coupling slots 33 and the resonant cavities 34, as shown in Figure 5b.

Le deuxième mode de réalisation, représenté sur les figures 6a et 6b, consiste en une structure guidée 40 incluant les fentes de couplage 41 et les cavités résonnantes 42 mais ouvertes sur leur partie supérieure. Dans le cas d'un guide non-filtrant le capot 43 comprend des éléments profilés 44 permettant de boucher les ouvertures que sont les fentes 41 et les cavités ouvertes 42 comme montré sur la figure 6a. Dans le cas inverse, le guide devient filtrant en fixant simplement un capot plat 45 par-dessus la structure guidée 40.The second embodiment, shown in Figures 6a and 6b, consists of a guided structure 40 including the coupling slots 41 and the resonant cavities 42 but open on their upper part. In the case of a non-filtering guide cover 43 comprises profiled elements 44 for closing the openings that are the slots 41 and the open cavities 42 as shown in Figure 6a. In the opposite case, the guide becomes filtering by simply fixing a flat cover 45 over the guided structure 40.

La figure 7 illustre les deux plans de fréquence sur la figure 6b (bande basse et bande haute) avec commutation de l'oscillateur local à la fréquence OL et activation/désactivation d'un filtre réjecteur à 28.55GHz.FIG. 7 illustrates the two frequency planes in FIG. 6b (low band and high band) with switching of the local oscillator at the frequency OL and activation / deactivation of a rejection filter at 28.55 GHz.

Ce terminal évolutif peut être aisément configuré par l'utilisateur sans intervention d'un professionnel, grâce à un interrupteur manuel (ou automatique commandé par l'IDU) et par une modification du filtrage en changeant le capot d'un guide d'onde. Ce système permet de diminuer sensiblement le coût d'installation. Dans le même soucis de réduction des coûts d'installation des terminaux, cette technique peut être sur étendue à tout autre dispositif émission multi-bandes.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 a modification of the filtering by changing the cover of a waveguide. This system significantly reduces the cost of installation. In the same concern to reduce terminal installation costs, this technique can be extended to any other multi-band transmission device.

La présente invention a été décrite en se référant à un terminal fonctionnant en bande Ka avec un filtre réjecteur constitué par un guide d'onde rectangulaire à 3 pôles, il est évident pour l'homme de l'art qu'elle peut être utilisée dans des terminaux fonctionnant dans d'autres bandes et avec des filtres réjecteurs en guide d'ondes différents. Par exemple, la présente invention peut également mise en oeuvre dans des terminaux utilisateur multi-bandes haute fréquence pour des applications de type MMDS (Microwave Multipoint Distribution System) opérant dans les bandes 40GHz.The present invention has been described with reference to a terminal operating in Ka-band with a rejector filter consisting of 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 rejection filters. For example, the present invention can also be implemented in high-frequency multi-band user terminals for MMDS (Microwave Multipoint Distribution System) applications operating in the 40GHz bands.

Claims (6)

  1. Outdoor unit of a reception terminal including a return channel, characterized in that the return channel comprises:
    - a local oscillator (10) providing a signal with a frequency that can be selected from at least two frequencies,
    - a transposition means (X2) that transposes a signal to be transmitted using the signal provided by the local oscillator,
    - a wideband filtering means (11) that allows through signals whose frequency corresponds to the transposed signal independently from the frequency of the local oscillator, and
    - a waveguide element (12, 30, 40) having a cover (31, 32, 43, 45) that depends on the frequency selected for the local oscillator.
  2. Outdoor unit according to claim 1, characterized in that the waveguide cover transforms the waveguide (30, 40) into a band rejector filter that rejects a bandwidth corresponding to a leak of the transposition frequency in the wideband.
  3. Outdoor unit according to one of claims 1 or 2, characterized in that the cover is either a flat cover (31), or a cover (34) including slot-coupled resonant cavities.
  4. Outdoor unit according to one of claims 1 or 2, characterized in that the waveguide comprises resonant cavities (42) coupled by slots (41), and in that the cover (43, 45) is either a flat cover (45), or a cover (43) comprising elements that electrically plug the slots.
  5. Outdoor unit according to one of claims 1 to 4, characterized in that the local oscillator comprises means for selecting the oscillation frequency.
  6. Outdoor unit according to claim 5, characterized in that the means for selecting the oscillation frequency is either a manual switch or a command from an indoor unit or terminal.
EP04816196A 2003-09-18 2004-09-13 Broad distribution bi-directional user terminal at configurable broadcast frequencies Ceased EP1665551B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04816196A EP1665551B1 (en) 2003-09-18 2004-09-13 Broad distribution bi-directional user terminal at configurable broadcast frequencies

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03292300 2003-09-18
PCT/FR2004/050429 WO2005029719A2 (en) 2003-09-18 2004-09-13 Broad distribution bi-directional user terminal at configurable broadcast frequencies
EP04816196A EP1665551B1 (en) 2003-09-18 2004-09-13 Broad distribution bi-directional user terminal at configurable broadcast frequencies

Publications (2)

Publication Number Publication Date
EP1665551A2 EP1665551A2 (en) 2006-06-07
EP1665551B1 true EP1665551B1 (en) 2007-11-14

Family

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EP04816196A Ceased EP1665551B1 (en) 2003-09-18 2004-09-13 Broad distribution bi-directional user terminal at configurable broadcast frequencies

Country Status (4)

Country Link
US (1) US7697888B2 (en)
EP (1) EP1665551B1 (en)
DE (1) DE602004010157T2 (en)
WO (1) WO2005029719A2 (en)

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* Cited by examiner, † Cited by third party
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

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DE473076C (en) 1929-03-09 Franz Bienefeld Machine for the automatic closing of bottles with caps made of soft metal
FR2666177B1 (en) * 1990-08-27 1993-02-05 Alcatel Telspace LATERAL ACCESS MICROWAVE FILTER.
US6366620B1 (en) * 1994-12-13 2002-04-02 Hughes Electronics Corporation VSAT system
US6177964B1 (en) * 1997-08-01 2001-01-23 Microtune, Inc. Broadband integrated television tuner
JP3476351B2 (en) * 1997-11-27 2003-12-10 シャープ株式会社 Low noise amplifier
AU4981499A (en) 1998-07-09 2000-02-01 Act Wireless Satellite network terminal
JP4378835B2 (en) * 2000-04-10 2009-12-09 パナソニック株式会社 Microwave oscillator and satellite reception downconverter
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JP2003143028A (en) * 2001-11-01 2003-05-16 Sharp Corp Low-noise converter
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Also Published As

Publication number Publication date
WO2005029719A2 (en) 2005-03-31
US20070032190A1 (en) 2007-02-08
DE602004010157T2 (en) 2008-10-30
US7697888B2 (en) 2010-04-13
EP1665551A2 (en) 2006-06-07
DE602004010157D1 (en) 2007-12-27
WO2005029719A3 (en) 2005-06-02

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