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Compact capacitive compensated directional coupler using planar artificial transmission lines

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4 Author(s)
Liu, C. ; Sch. of Electron. & Inf. Eng., Sichuan Univ., Chengdu, China ; Yang, T. ; Huang, K. ; Menzel, W.

A novel compact directional coupler based on planar artificial transmission lines is proposed. Interdigital capacitors are introduced to compensate for the odd-mode phase velocity in order to achieve a high directivity. The size of this proposed coupler is about 25% that of a conventional one. A 20 dB directional coupler at 900 MHz has been designed and fabricated. The directivity reaches 36 dB at the centre frequency. The design, simulation and measurements are presented.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 24 )