Reduced Branch-Line Coupler Using Radial Stubs(Microwaves, Millimeter-Waves)

概要

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This study proposes a 3 dB branch-line coupler using radial stubs to achieve reduced coupler size and simplified stub arrangement. As the electrical lengths of stubs used here are less than 90° at center frequency, a method of comparing input impedances to obtain radial stubs that are equivalent to straight stubs is discussed. The frequency characteristics of the proposed coupler are derived by combining classical transmission line theory with the computed data of radial stub input impedances. The methods presented here increase possibilities for realizing reduced branchline couplers by means of stub design. Experimental results agree well with theoretical results except for slight differences in the high frequency region.
社団法人電子情報通信学会の論文
2004-09-01