Tunable phase shifter having wide instantaneous bandwidth

Details Tunable phase shifter having wide instantaneous bandwidth Tunable phase shifter having wide instantaneous bandwidth

1989-06-08

1990-12-18

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Equalizers

333139, H03H 500

Patent

active

049789317

ABSTRACT:
A phase shifter providing constant group delay and a wide instantaneous bandwidth is taught. In one embodiment, an input port is connected to an output port with a power splitter formed of a transformer connected between the input port and the output port, and having a center tap serving as a sum port. An impedance, such as a resistor, is connected in parallel with the transformer between the input port and the output port. A reactive network is connected between the sum port and ground, including one or more variable reactance device, such as a varactor, which alter the reactance of the reactive network in response to a control signal. Additional reactive elements are included in the reactive network to provide additional poles and zeros which change frequency in response to the variable reactance elements, in order to provide a group delay which is constant for various reactance values provided by the reactive network between the lowest frequency of interest and a higher frequency of interest.

REFERENCES:
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Shiki et al., "If Variable Equalizers for FM Microwave Radio Links", IEEE Trans. on Circuits and System, vol. CAS-21, No. 4, Jul. 1974, pp. 517-527.

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