Compact Slow-Wave Branch-Line Coupler Using Crossing Bond Wires

Abstract

Abstract-This paper proposes a compact and miniaturized branch-line coupler using a crossing bond wire structured slow-wave branch line (CBWSWB). The proposed coupler achieves a size reduction of 82% compared with a conventional implementation. Measured S 11 , S 21 , S 31 and S 41 of the proposed coupler are better than −24, −3.7, −3.7 and −28 dB at 3 GHz, respectively. Furthermore, the phase difference between through and coupling ports of the coupler is within 1 • .