A compact coupler design using meandered line compact microstrip resonant cell (MLCMRC) and bended lines

In this paper, a novel branch-line coupler using meandered line compact microstrip resonant cell (MLCMRC) and bended lines is proposed. The presented coupler works at 0.9 GHz, with good specifications. The measured values of S-12 and S-13 at 0.9 GHz are 3.2 dB and 3.3 dB, respectively, which show better than 0.3 dB insertion loss in the pass band. The measured value of S-14 is better than 36 dB and S-11 is better than 31 dB. The proposed design can eliminate 3rd and 5th harmonic with high suppression level (more than 40 dB) and reduce the size of the circuit more than 64% compared to the conventional branch-line coupler. The presented coupler has a very simple structure, which can be used in modern communication applications.

Automated summary

A novel branch-line coupler using MLCMRC and bended lines is proposed in this paper, with good specifications including high suppression level for harmonics. Compared to conventional couplers, the proposed design reduces circuit size and has a simple structure, suitable for modern communication applications.