Broadband Balun Circuits Composed of Impedance Transforming Directional Couplers and LH Transmission-Line Sections
Keywords:
Microwave baluns, directional couplers, coupled-line couplersAbstract
In this paper, a new approach to the design of a
balun circuit is presented. The proposed balun is composed of an impedance-transforming directional coupler and an LH/RH transmission line differential phase shifter. The proposed solution features broadband amplitude and phase response,
moreover, a flexibility of the impedance transformation from balanced to imbalanced port is obtained. The proposed concept has been verified by the design of a balun circuit featuring over-an-octave bandwidth and impedance transformation 70 bal. / 50 imbal.
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