Pilot tone reference-less phase conjugator for phase modulated retrodirective antenna applications

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Abstract

This letter presents a simple tracking phased locked loop (PLL) that can be used to track phase-modulated signals and provide a phase-conjugated signal for retrodirective retransmission. The configuration allows the retrodirective antenna to directly track phase-modulated signals with no requirement for a separate continuous wave (CW) pilot tone. The ability to directly track phase-modulated signals is carried out using a 4× multiplier on the tracking PLL reference signal. Practical phase conjugation results are presented for a five-element retrodirective array simultaneously sending and receiving phase-modulated (QPSK) signals. Signals with levels as low as -122 dBm can be phase-conjugated and retransmitted with 30 dBm EIRP.
Original languageEnglish
Pages (from-to)298-300
Number of pages3
JournalIEEE Antennas and Wireless Propagation Letters
Volume15
Early online date05 Jun 2015
DOIs
Publication statusPublished - 2016

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