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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...
A miniaturized branch-line coupler based on lowpass microstrip filters instead of conventional transmission lines is presented in this paper. The design of proposed couplers is performed using lowpass filter of 5th, 7th and 9th order. This is done to achieve a compact circuit layout in microstrip implementation. Prototypes with these proposed structures, operating at 2 GHz frequency, have been designed...
This paper presents a variation of the conventional ring resonator. It consists in an easier feeding way with direct connections instead of classical coupling accesses. Besides, the ring is capacitively loaded in order to allow implementation of narrow-band filter and reduce its physical length. A synthesis is proposed to design the filter. Based on this ring resonator cell, a second-order and fourth-order...
The L-band band-pass interdigital filter was studied, a large number of experimental data showed that bandwidth narrowed with the increasing of resonator width, and the center frequency becomes larger with the reducing of the resonator length; the bandwidth will widen when the distance between resonator was reduced. Change coupled structure, increase the effective coupling area of the microstrip line...
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