Abstract
An analog phase shifter using a bridged-T circuit topology is described in this paper. A conventional analog phase shifter employs a 3-dB 90° branch-line hybrid coupler applying four quarter-wavelength transmission lines. Herein, there are only two transmission lines in the proposed phase shifter, one of which is a quarter-wavelength long and the other is shorter than a quarter-wavelength. The structure of the phase shifter can be more compact by folding the quarter-wavelength transmission line. And the circuit can be miniaturized to less than one-fifth as compared to the conventional one. In addition, a large phase shift can be achieved by only two varactor diodes. Next, a phase shifter with an insertion loss of 2.29 ± 1.03 dB and a phase shift of more than 200° at the frequency range of 4.8 to 5.6 GHz was manufactured and tested. The size of the experimental phase shifter is less than 0.09 λg × 0.13 λg.
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