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Design of microwave wide-band quadrature hybrid using planar transformer coupling method

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3 Author(s)
Wei-Shin Tung ; Inst. of Electron. Eng., Chang-Gung Univ., Taiwan ; Hsu-Hsiang Wu ; Yi-Chyun Chiang

A lumped-element quadrature hybrid consisting of two-section inductive coupled π-networks is presented. A synthesizing method involving a new set of design equations are also developed to realize the proposed hybrid with very good balance in both magnitude and phase between the output ports over a 38% fractional bandwidth. The measurements of the two prototypes show quite good agreement with the theoretical predictions. The proposed hybrid is compact and suited to be implemented by conventional microwave-integrated-circuit technology.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:51 ,  Issue: 7 )