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A Compact Dual-Band 90° Coupler With Coupled-Line Sections

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1 Author(s)
Yeung, L.K. ; Dept. of Electron. Eng., Chinese Univ. of HongKong, Shatin, China

A new dual-band 90° coupler using coupled transmission lines is proposed in this paper. As the coupler consists of only three quarter-wave coupled-line sections, it occupies less circuit area as compared to other existing dual-band branch-line couplers. A desired dual-band operation can be achieved by proper design of the coupling level for those coupled-line sections. Moreover, the coupler's configuration contains a degree of freedom so that its design is “customizable,” allowing itself to be conveniently realized on a variety of circuit and substrate technologies. As a result, it is suitable for use in many practical applications.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 9 )