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A brief overview of modern methods of miniaturization of microstrip devices is presented. A compact design of the directional coupler, which divides the power with the ratio 1:2, is implemented on a substrate with a relative permittivity ε = 4.4 and thickness h = 1 mm. The proposed layout has a considerably smaller size than the traditional design by using lowpass filters having the same phase differences...
The paper describes the analysis of the efficiency of the new technique of miniaturization of microstrip devices applied to the branch-line coupler design. The method is based on the replacement of transmission line segments of the coupler with the lowpass filters with the same phase response, which allows significant device size reduction. There are in the paper four designs of compact branch-line...
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