Design of wideband phase shifters with low phase error using parallel inductor and capacitor for wideband antenna applications

Mohammad Mahdi Honari, Rashid Mirzavand and Pedram Mousavi

Journal of Electromagnetic Waves and Applications, 2017, vol. 31, issue 7, 716-726

Abstract: In this paper, a phase shifter with arbitrary phase shift is presented using a coupled-line section and lumped elements. The proposed structure which consists of coupled-line section and parallel inductor and capacitor takes advantage of being realizable for phase shifts more than 90° due to relaxing the requirement for tight coupling in coupled line. The analysis shows that it is possible to achieve an arbitrary phase shift on a wide band with a low phase error. To verify the concept, three 90°, 135° and 180° phase shifters are fabricated. Measured 10-dB impedance bandwidths of 73, 62 and 56% have been obtained for 90°, 135° and 180° phase shifters, respectively, with maximum phase error of ±3°. Finally, to avoid the problems of using discrete elements, the inductor and capacitor in180° phase shifter arte realized utilizing microstrip lines. The measurement results of both designs with discrete elements and microstrip lines are a match which indicates that the proposed structure is reliable for arbitrary phase shift for high frequencies.

Date: 2017
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DOI: 10.1080/09205071.2017.1308838

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