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Transmit-and-receive-antenna-element-with-feedback

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Transmit and receive antenna element with feedback

Details

Inventors: Devendorf, Don C.; Kelley, Edwin A.; Komori, Roy S.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Tubbesing; T. H.
Assistant Examiner:
Attorney, Agent or Firm: Alkov; L. A., Denson-Low; W. K.

A transmit/receive element having a transmit/receive circuit that includes a variable frequency transmit phase lock loop and a variable frequency receive phase lock loop, and an output amplifier that receives a modulated transmit signal from the transmit phase lock loop for driving an antenna element. The transmit phase lock loop receives a feedback signal which is (a) the modulated transmit signal during receive intervals and (b) the output of the output amplifier during transmit intervals, such that the transmit phase lock loop is controlled by a feedback signal at all times.

DETAILED DESCRIPTION It would therefore be an advantage to provide a MMIC transmit/receive circuit that does not require phase command calibration data.
Another advantage would be to provide a MMIC transmit/receive circuit that has a linearized phase transfer function.
The foregoing and other advantages are provided by the invention in a transmit/receive circuit that includes phase lock loops in the transmit and receive functions for reducing undesired phase variation due to characteristics of the circuitry providing the transmit and receive functions.

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