US 11,855,667 B2
Radio frequency loopback for transceivers
Kenneth V. Buer, Gilbert, AZ (US); Ramanamurthy V. Darapu, Gilbert, AZ (US); Martin Gimersky, Lausanne (CH); David E. Pettit, Gilbert, AZ (US); and Bill T. Agar, Scottsdale, AZ (US)
Assigned to Viasat, Inc., Carlsbad, CA (US)
Filed by VIASAT, Inc., Carlsbad, CA (US)
Filed on Jan. 5, 2022, as Appl. No. 17/569,354.
Application 17/569,354 is a continuation of application No. 16/960,823, granted, now 11,258,472, previously published as PCT/US2019/016273, filed on Feb. 1, 2019.
Claims priority of provisional application 62/625,443, filed on Feb. 2, 2018.
Prior Publication US 2022/0131562 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/04 (2006.01); H04B 17/11 (2015.01); H04B 17/15 (2015.01); H04B 17/21 (2015.01); H04B 17/29 (2015.01); H04B 1/12 (2006.01); H04B 1/44 (2006.01)
CPC H04B 1/0475 (2013.01) [H04B 1/12 (2013.01); H04B 1/44 (2013.01); H04B 17/11 (2015.01); H04B 17/15 (2015.01); H04B 17/21 (2015.01); H04B 17/29 (2015.01)] 27 Claims
OG exemplary drawing
 
1. A transceiver for communicating with a target device, the transceiver comprising:
a waveguide diplexer comprising a common port coupled to first and second individual ports, the first individual port associated with a transmit frequency range and the second individual port associated with a receive frequency range;
a transmitter coupled with the first individual port of the waveguide diplexer and configured to output a transmit signal to the first individual port within the transmit frequency range;
a bidirectional coupler having a coupled port coupled with the common port of the waveguide diplexer;
a loopback translator coupled with the coupled port and configured to obtain a loopback signal associated with the transmit signal via the coupled port, and to translate the loopback signal from within the transmit frequency range to within the receive frequency range; and
a receiver having in input port coupled with the second individual port of the waveguide diplexer and coupled with the loopback translator via a loopback path, wherein the receiver is configured to, in a first mode, obtain a received signal from the target device via the waveguide diplexer, and, in a second mode, obtain the translated loopback signal via the loopback path and compare the translated loopback signal to a representation of the transmit signal to generate a compensation signal,
wherein the transmitter is further configured to receive the compensation signal and adjust the transmit signal based at least in part on the compensation signal.