US 12,140,693 B2
Monitoring impedance matching of a receive antenna and monitoring a receive chain using a test signal
Faisal Ahmed, Linz (AT); and Muhammad Furqan, Linz (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Dec. 7, 2021, as Appl. No. 17/643,110.
Prior Publication US 2023/0176185 A1, Jun. 8, 2023
Int. Cl. G01S 7/40 (2006.01); G01R 29/08 (2006.01); H01Q 3/26 (2006.01)
CPC G01S 7/4004 (2013.01) [G01R 29/0892 (2013.01); H01Q 3/267 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A device, comprising:
a receive antenna input to couple a receive antenna to a receive chain of the device;
a test signal generator to generate a first test signal;
a signal coupler between the receive antenna input and the receive chain, the signal coupler comprising a first port to inject the first test signal into the receive antenna via the receive antenna input during operation in a first test mode;
a mixer, included in the receive chain, to:
receive a first reflected signal resulting from the first test signal being injected into the receive antenna during the operation in the first test mode, and
down-convert the first reflected signal to generate a first baseband signal; and
a control circuit to:
monitor an impedance matching of the receive antenna based on evaluating one or more characteristics of the first baseband signal, and
evaluate a connection of the receive antenna based on monitoring the impedance matching of the receive antenna.