Frequency translating phase conjugation circuit for active retro

Details Frequency translating phase conjugation circuit for active retro Frequency translating phase conjugation circuit for active retro

1978-12-29

1980-11-11

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

H04B 700

Patent

active

042336066

ABSTRACT:
An active retrodirective antenna array having central phasing from a reference antenna element through a "tree" structured network of transmission lines utilizes a plurality of phase conjugate circuits (PCCs) at each node and a phase reference regeneration circuit (PRR) at each node except the initial node. Each node virtually coincides with an element of the array. A PCC generates the exact conjugate phase .phi.*.sub.1 of an incident signal .phi..sub.1 in accordance with the relation R (2.phi..sub.0 -.phi..sub.1) where R is equal to the reciprocal of 1-2
, and n.gtoreq.4, using a phase locked loop which combines the phases .phi..sub.1 and .phi.*.sub.1 in an up-converter, divides the sum by 2 and mixes the result with the phase .phi..sub.0 in a down-converter for phase detection by the phase .phi.*.sub.1 from the loop oscillator divided by n. The PRR extracts the phase .phi..sub.0 from the conjugate phase .phi.*.sub.1 by mixing .phi.*.sub.1 divided by 2 and divided by n in a down-converter and then mixing the phase .phi..sub.1 divided by 4 with the result of the down-converter in two cascaded up-converters. Both the PCC and the PRR are not only exact but also free from mixer degeneracy.

REFERENCES:
patent: 4148031 (1979-04-01), Tausworthe et al.

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