Asymmetrical balun design with tunable bandwidth and transmission zero

Chichang Hung, Kengyi Huang, Tsenchieh Chiu, Juiching Cheng

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


This paper reports on the design of an asymmetrical balun with a tunable transmission zero. First, a compact balun is proposed with asymmetric feeding points. The proposed balun possesses a tunable transmission zero for the harmonic suppression. The bandwidth of the proposed design can be easily regulated by the asymmetrical feeding structure. The proposed design is fabricated using ARLON 25N with thickness of 0.46 mm. The measured results agree well with the simulation. According to the measurement results, the maximum insertion loss is 1.2 dB, the maximum in-band phase imbalance is within 4 degrees, and the maximum in-band magnitude imbalance is less than 0.4 dB.

Original languageEnglish
Title of host publicationAsia-Pacific Microwave Conference Proceedings, APMC 2011
Number of pages4
StatePublished - 2011
EventAsia-Pacific Microwave Conference, APMC 2011 - Melbourne, VIC, Australia
Duration: 5 Dec 20118 Dec 2011

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


ConferenceAsia-Pacific Microwave Conference, APMC 2011
CityMelbourne, VIC


  • Baluns
  • Coupled Lines
  • Transmission Zero


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