Wideband Bandpass Filtering Balun With Perfect In-Band Matching and Isolation

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 67; no. 10; pp. 1884 - 1888
• Main Authors: Chen, Weijuan, Wu, Yongle, Wang, Weimin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Balun/balanced-to-unbalanced; Baluns; Bandpass filters; Bandwidths; Broadband; Chebyshev approximation; Circuit design; Filtering; filtering selectivity; Impedance; Matching; output isolation; Resistors; Selectivity; synthesis design; Transfer functions; Wideband

In this brief, a wideband balun with bandpass filtering response is synthesized based on even-/odd-mode analysis. To obtain the desired filtering selectivity, the transfer function of the proposed balun is derived and forced to be the same as the n th-order Chebyshev-transfer function. Thus, with sp...