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Investigation of a Wideband 90 ^{\circ} Hybrid Coupler With an Arbitrary Coupling Level

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2 Author(s)
Leung Chiu ; State Key Lab. of Millimeter Waves, Southeast Univ., Nanjing, China ; Quan Xue

This paper presents a new class of wideband 90?? hybrid coupler with an arbitrary coupling level. The physical size of the proposed coupler is close to that of a conventional two-section branch-line coupler, but it has an additional phase inverter. The impedance bandwidth of the proposed coupler is close to that of a four-section branch-line coupler. The proposed coupler is a backward-wave coupler with a port assignment different from that of a conventional branch-line coupler. The design formulas of the proposed coupler are proved based on its even- and odd-mode half structures. We demonstrated three couplers at the center frequency of 2 GHz with different design parameters.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:58 ,  Issue: 4 )