A dual-band 3-dB three-port power divider based on a two-section transmission line transformer

A new dual-band 3-dB three-port power divider with arbitrary impedance terminations is presented in this paper. The structure is composed of a two-section transmission line transformer and an isolation resistor. The transmission line's electrical length is /spl pi//3 each at fundamental frequency, resulting in a 2/spl pi//3 total length. The proposed circuit's design equations and graph obtained from analytical results are also given. The technique is validated by the experimental results on 3-dB 900/1800 MHz power divider with Z/sub s/=100 /spl Omega/ and Z/sub L/=50 /spl Omega/. Good performances of the proposed power combiner/divider at both frequencies are obtained.