The use of an interdigitated coupler and a pair of switching circuits composed of appropriate diodes and two-stub matching circuits is experimentally shown to produce a broad-band reflection-type 180/spl deg/ phase shift section operating at 8.50-10.50 GHz with /spl plusmn/ 2/spl deg/ error when fabricated using microwave integrated circuit techniques.
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Yahara et al. (1975) studied this question.
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