Sum/difference beam duplexer for coupled tapered slot-line antenna

A successful design for a sum/difference beam duplexer used as the feed network of a coupled tapered slot-line antenna (CTSA) is presented. VSWR/spl les/1.5:1 was obtained at both the sum and difference ports over the 33.4-36.0 GHz frequency range. An isolation of -25.0 dB was obtained between the sum and difference ports over the range 33.2-37.6 GHz.