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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...
The present paper is devoted to influence research of the substrate material thickness on the miniaturization degree of the microstrip branch-line coupler device. The miniaturization is executed with the replacement of the ordinary microstrip line by its equivalent in the form of lower frequencies. There have been compared the numerical simulation results of the modeling of branch-line coupler structures...
Substrate integrated waveguide (SIW) has become popular and it has widely been used in microwave and millimeter wave circuit and system designs. Compared to other planar transmission lines, the geometrical dimension, in particular, the width of an SIW is much larger, which depends on the operating frequency and substrate material. Therefore, an effective SIW miniaturization is required for developing...
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