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Analysis and Synthesis of Double-Sided Parallel-Strip Transitions

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2 Author(s)
Carro, P.L. ; Dept. of Electron. & Commun. Eng., Univ. de Zaragoza, Zaragoza, Spain ; de Mingo, J.

Antenna feeders, mixers, and filters made in double-sided parallel-strip technology usually must be adapted to unbalanced lines like the microstrip structure, needing transitions from asymmetric to symmetric waveguides (baluns). In this paper, we propose a new method for the evaluation of a generic tapered balun based on a conformal-mapping technique and an integral equation. This method, along with the use of an optimization technique such as genetic algorithms, allows for quick evaluation of the return losses of any tapered balun and the synthesizing of specific shapes to achieve desired responses in terms of return losses or impedance values.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:58 ,  Issue: 2 )