Broadband directional couplers for microwave-microwave double resonance

Abstract
An improved type of broadband directional couplers specially suitable for microwave‐microwave double‐resonance experiments is described. It allows coupling of microwave power between different waveguide bands with almost constant coupling ratio over a full waveguide band. Constructional details and performance of two models are given, one for coupling power between 18 and 26.5 GHz into an X‐band guide, the other for coupling power between 12.4 and 18 GHz into an X‐band guide.

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