Balun diplexer design in hybrid structure of microstrip line and slot-line

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


In this paper, a new balun diplexer consists of hybrid microstrip and slot-line resonator structures is designed with broad-band common-mode (CM) suppression. The balun diplexer was formed by combining two balun bandpass filters (BPFs) operating at 1.92 GHz and 2.45 GHz, respectively, through a T-junction. Cross-coupling between the feed-lines and the SISLRs at a proper position is adopted to obtain an appropriate coupling strength between the above two resonators. In addition, the incompleteness of the slot-line resonator results from the open-boundary condition along the symmetry plane in CM operation is employed to effectively suppress the CM signals. A prototype of the proposed balun diplexer was implemented and measured with a differential-mode isolation of higher than 25.4 dB and a CM suppression of larger than 27.5 dB in the frequency range of 1-6 GHz. Good agreement was observed between the simulated and the measured results.

Original languageEnglish
Title of host publication2015 Asia-Pacific Microwave Conference Proceedings, APMC 2015
EditorsFan Meng, Wei Hong, Guang-Qi Yang, Zhe Song, Xiao-Wei Zhu
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479987658
Publication statusPublished - 2015 Jan 1
Event2015 Asia-Pacific Microwave Conference, APMC 2015 - Nanjing, China
Duration: 2015 Dec 62015 Dec 9

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Other2015 Asia-Pacific Microwave Conference, APMC 2015

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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