Patent ID: 9577847
Date: 2017-02-21
CPC Classifications: H04B,H04L

Claim:
1. A non-reciprocal radio frequency transceiver front end apparatus, comprising: at least a first and second time-varying transmission line (TVTL) providing two TVTL paths, each TVTL having first and second inputs and an output; wherein each TVTL comprises a transmission line of distributed modulated capacitors (DMC); wherein said second input is configured for connection to receive a radio frequency signal and the first input of each TVTL is configured for connection to a carrier source that provides a high frequency pumping signal to the TVTL for upconversion in frequency; a first 90 degree coupler having a zero degree phase shifted output coupled to said second input of said first TVTL, and a 90 degree phase shifted output coupled to said second input of said second TVTL; wherein said first 90 degree coupler is configured with an antenna input; and a second 90 degree coupler having a first input connected to the output of said first TVTL, and a second input connected to output of said second TVTL; wherein said second 90 degree coupler generates a zero degree phase shift for connection to a receive port, and a 90 degree phase shift for connection to a transmit port; and wherein an upconverted received signal and transmitted signal are physically separated into different ports, so that transmitted signals cancel at said receive port while the received signals add at the receive port to provide another level of isolation beyond that available in a single DMC, while simultaneously operating a transmitter and receiver sharing an antenna.