Broad distribution bi-directional user terminal at configurable broadcast frequencies
View Patent ↗The invention proposes an upgradable product capable of covering two sub-bands. An outdoor unit comprises, on the uplink, a switchable oscillator coupled to a waveguide featuring a removable cover enabling the said waveguide to be converted into a band rejector filter.
1. Outdoor unit of a reception terminal including a return channel, wherein the return channel (BUC) comprises:
a local oscillator providing a signal with a frequency that can be selected from at least two frequencies,
a transposition means that transposes a signal to be transmitted using the signal provided by the local oscillator,
a wideband filtering means that allows through signals whose frequency corresponds to the transposed signal independently from the frequency of the local oscillator, and
a configurable rejection filter depending on the frequency selected for the local oscillator;
wherein the configurable rejection filter comprises a guided structure with a replaceable cover, wherein said replaceable cover may be either:
a cover including cavities or slots, which configures said configurable rejection filter into a band rejection filter that rejects a bandwidth corresponding to a leak of the transposition frequency, or
a flat cover, which causes the configurable rejection filter to operate as a substantially non-filtering element.
2. Outdoor unit according to claim 1 , wherein the local oscillator comprises means for selecting the oscillation frequency.
3. Outdoor unit according to claim 2 , wherein the means for selecting the oscillation frequency is either a manual switch or a command from an indoor unit or terminal.
4. Outdoor unit according to claim 1 , wherein the replaceable cover including cavities or slots is a cover including slot-coupled resonant cavities.
5. An outdoor unit of a reception terminal including a return channel, wherein the return channel (BUC) comprises:
a local oscillator providing a signal with a frequency that can be selected from at least two local oscillator frequencies,
a transposition means that transposes a signal to be transmitted using the signal provided by the local oscillator,
a wideband filtering means that passes the signal from said transposition means resulting from selection of any of said at least two local oscillator frequencies, and
a configurable rejection filter for rejecting a leak of transposition frequency for at least one of said at least two local oscillator frequencies;
wherein the configurable rejection filter is configured through placement of a cover on a waveguide
wherein the configurable rejection filter comprises a guided structure with a replaceable cover, wherein said replaceable cover may be either:
a cover including cavities or slots, which configures said configurable rejection filter into a band rejection filter that rejects a bandwidth corresponding to a leak of a transposition frequency, or
a flat cover, which configures said configurable rejection filter to operate as a substantially non-filtering element.
6. Outdoor unit of a reception terminal including a return channel, wherein the return channel (BUC) comprises:
a local oscillator providing a signal with a frequency that can be selected from at least two frequencies,
a transposition means that transposes a signal to be transmitted using the signal provided by the local oscillator,
a wideband filtering means that allows through signals whose frequency corresponds to the transposed signal independently from the frequency of the local oscillator, and
a configurable rejection filter depending on the frequency selected for the local oscillator;
wherein the configurable rejection filter comprises a guided structure with a replaceable cover, wherein said replaceable cover may be either:
a flat cover, which configures said configurable rejection filter into a band rejection filter that rejects a bandwidth corresponding to a leak of the transposition frequency, or
a cover comprising profiled elements, which configures said configurable rejection filter to operate as a substantially a non-filtering element.