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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 S11, S21, S31 and S41 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◦.

COMPACT SLOW-WAVE BRANCH-LINE COUPLER USING CROSSING BOND WIRES