A miniature TSV-based branch line coupler using π equivalent circuit model for transmission line

Abstract

A miniaturized lumped element branch line coupler with π-type equivalent circuit is proposed, the design of branch line coupler has been carried out for S-band. The lumped element in the branch line coupler is realized by TSV, and the coupler is simulated and verified by industrial simulation software HFSS. The results show that the return loss is greater than 19dB, the isolation is better than 20dB, and the insertion loss is less than 1.53dB at the frequency of 2.1-2.4GHz. The size of the miniature TSV-based branch line coupler is only 0.660×0.630mm² (0.018×0.017λ²_g).