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In this paper, an broadband Schiffman phase shifter is proposed using vertically installed coupled lines. It consists of the typical coupled lines and a extra coupled lines which is installed vertically on the original coupled lines plane. Phase responses of Schiffman phase shifter with vetically installed coupled lines are analyzed in consideration of the phase velocity of two independent transmission modes and the characteristic impedances. The 90° Schiffman phase shifters with high impedance ratio is realized at 2.4 GHz, which cannot be implemented with the conventional coupled lines. The measured results show that the bandwidth is 1.5~3.2 GHz(70.8 %) within the phase errors ±5°. The measured return loss is found to be better than 12.4 dB and insertion loss is less than 1.2 dB over the operating frequency band.

Broadband 90° Schiffman Phase Shifter with Vertically Installed Coupled Lines