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Inductively Compensated Parallel Coupled Microstrip Lines and Their Applications

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3 Author(s)
Phromloungsri, R. ; Applications & Telecommun. Dept., Mahanakorn Univ. of Technol., Bangkok ; Chongcheawchamnan, M. ; Robertson, Ian D.

A simple method using lumped inductors to compensate unequal even- and odd-mode phase velocities in parallel coupled microstrip lines is presented. The singly and doubly compensated cases are analyzed to enable the optimum inductor values and the electrical lengths of the compensated coupled lines to be calculated from closed-form expressions. The technique proposed not only improves the performance, but also yields a more compact design. To demonstrate the technique's broad range of applicability, the compensated coupled-line structure is used to enhance the performance of a 900-MHz Lange coupler, a 1-GHz multisection 10-dB coupler, a 900-MHz planar Marchand balun, and a 1.8-GHz parallel coupled bandpass filter

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 9 )

Date of Publication:

Sept. 2006

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