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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...
This letter proposes a new type of microstrip slow-wave structure. The proposed structure has the signal strips and the inserted ground strips periodically loaded in the internal part of the conventional microstrip line. The proposed microstrip line has not only the same outline contour but also a lower phase velocity compared to the conventional one, especially for the thick substrate. In addition,...
The half mode substrate integrated waveguide (HMSIW) possesses the highpass characteristic of SIW but the size is nearly half reduced. A recently proposed asymmetric defected ground structure (ADGS), composed of two square headed slots connected with a rectangular slot transversely under a microstrip line, exhibits quasi-elliptic-function band-reject characteristics around 3 GHz with high selectivity...
The investigations on half-mode substrate integrated waveguide (HMSIW) optimized for use in high-speed bandpass digital interconnects is reported in this paper. It is known that the substrate integrated waveguide (SIW) has been successfully proposed and used in ultrahigh-speed digital interconnects. The structure features low-loss, low-crosstalk and easy-to-fabricate in planar form using a standard...
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