Design of high-order wideband planar balun filter in S-plane bandpass prototype

Yun Wei Lin; Jhe Ching Lu; Chi-Yang Chang

doi:10.1109/TMTT.2012.2193137

Design of high-order wideband planar balun filter in S-plane bandpass prototype

Yun Wei Lin^*, Jhe Ching Lu, Chi-Yang Chang

^*Corresponding author for this work

Department of Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

A new high-order wideband planar balun filter is proposed in this paper. The balun filter is exact synthesized based on S-domain bandpass prototype using Richards' Theorem to fit the user-defined specifications. By analyzing the redundant element in the equivalent circuit, the output impedance of the balun filter can be arbitrarily assigned. To use an S-plane bandpass prototype other than a high-pass prototype can shrink the circuit area and improve the stopband performance. The lumped capacitor approximation suppresses the spurious response in the stopband and further reduces the circuit size. A high-order balun filter with a bandwidth of 100% and a reflection coefficient of -15 dB is implemented by combining of microstrip lines, slotlines, and coplanar striplines. The simulation and measurement results match well.

Original language	English
Article number	6193187
Pages (from-to)	2124-2130
Number of pages	7
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	60
Issue number	7
DOIs	https://doi.org/10.1109/TMTT.2012.2193137
State	Published - 8 May 2012

Keywords

Balun filter
bandpass prototype
impedance transformation
planar structure
synthesis

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title = "Design of high-order wideband planar balun filter in S-plane bandpass prototype",

abstract = "A new high-order wideband planar balun filter is proposed in this paper. The balun filter is exact synthesized based on S-domain bandpass prototype using Richards' Theorem to fit the user-defined specifications. By analyzing the redundant element in the equivalent circuit, the output impedance of the balun filter can be arbitrarily assigned. To use an S-plane bandpass prototype other than a high-pass prototype can shrink the circuit area and improve the stopband performance. The lumped capacitor approximation suppresses the spurious response in the stopband and further reduces the circuit size. A high-order balun filter with a bandwidth of 100% and a reflection coefficient of -15 dB is implemented by combining of microstrip lines, slotlines, and coplanar striplines. The simulation and measurement results match well.",

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