Broadband directional coupler

Details Broadband directional coupler Broadband directional coupler

1976-12-27

1978-10-17

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 8, 333 11, H01P 512, H01P 518, H01P 516

Patent

active

041211804

ABSTRACT:
A four port directional coupler using two substantially identical transformers, each transformer having a turn ratio N with a substantially pure resistive impedance across both of the transformer's secondary windings and a substantially pure resistive impedance connecting the transformer's primary windings, whereby the coupling coefficient, C, of the directional coupler is a function of the said resistive impedances and N and is substantially a continuous function of the values of said resistive impedances for any independently selected value of N.

REFERENCES:
patent: 2734169 (1956-02-01), Douma
patent: 3723913 (1973-03-01), Seidel

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