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2020-10-11

Novel 3-dB Tandem Coupler with Wide Bandwidth by Using 4 Short Stubs

By Takeru Inaba and Hitoshi Hayashi
Progress In Electromagnetics Research Letters, Vol. 93, 131-136, 2020
doi:10.2528/PIERL20070801

Abstract

A new wideband 3-dB tandem coupler is presented that has wide bandwidth using four 90° short stubs. The proposed tandem coupler does not require a higher transmission line impedance or a narrower coupling gap than conventional couplers. Measurements of the fabricated tandem coupler operated at a center frequency of f0 = 1 GHz are presented as verification of the design concept. The fractional bandwidth (FBW) at which the return loss is suppressed to a level better than 15 dB was 71%. Theoretical calculations and measurements of the tandem coupler were in good agreement

Citation


Takeru Inaba and Hitoshi Hayashi, "Novel 3-dB Tandem Coupler with Wide Bandwidth by Using 4 Short Stubs," Progress In Electromagnetics Research Letters, Vol. 93, 131-136, 2020.
doi:10.2528/PIERL20070801
http://www.jpier.org/PIERL/pier.php?paper=20070801

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