Wideband digital radio with transmit modulation cancellation
View Patent ↗A microwave radio assembly is described including a directional antenna wherein the installation and aiming is simplified. The assembly is attached to the wall-mount fix via gimbals mechanism with one rotation axis for azimuth and one for elevation and the assembly preferably includes a sight mechanism including a pair of visual apertures is located in the radio assembly in a line parallel to the radio antenna radiation direction. The radio assembly further includes a modulation cancellation scheme in full duplex mode.
1. A microwave self-mixing transceiver front-end, comprising:
an oscillator loop having an amplifier with an input and an output, a resonator at a particular transmit frequency connected to said amplifier, and a filter connected between said resonator and said amplifier input; and
a mixer coupled to the output of said amplifier and a microwave port connected to the junction between said resonator and said filter.
2. The transceiver front-end of claim 1 , wherein said filter passes a received frequency with minimum loss and feeds the transmit frequency through with a predetermined attenuation.
3. The transceiver front end of claim 1 further comprising a filter between said amplifier and said mixer.
4. The transceiver front end of claim 1 , wherein resonator includes a tuning port for transmit modulation.
5. A microwave self-mixing transceiver front-end, comprising:
an oscillator loop having an amplifier with an input and an output, a resonator at a transmit frequency connected to said amplifier input, a power splitter whose input is connected said amplifier's output and whose outputs are connected to said resonator and to a microwave port;
and mixer coupled to said microwave port so as to receive signals from said microwave port and a fraction of a transmitted signal.
6. The front-end of claim 5 further comprising a low-noise amplifier (LNA) between said microwave port and said mixer.
7. The front-end of claim 6 , wherein said mixer is balanced and an output of the LNA is connected to a diplexer such that the transmit signal is coupled via the diplexer to one port of said mixer and the received signal is coupled via another port of the diplexer to another port of said mixer.