Abstract

A new wideband balun is presented. The designed balun has a symmetrical four-port structure with one port open-ended. It consists of a wideband impedance transformer and a broadband phase inverter. To design the wideband impedance transformer, an S-plane high-pass prototype has been exactly synthesized with third order Chebyshev response. A wideband parallel strip balun operating from 0.72 to 2.05 GHz is fabricated and tested to verify the design concept. The measured results match well with the design theory.

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