Differentially fed UWB QSC antenna with high common-mode suppression

Jun Wei Huang, Ching Her Lee, Chug I.G. Hsu

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


In this paper, we propose a differentially fed ultrawideband (UWB) quasi-self-complementary (QSC) antenna with a 5.5-GHz notch band. By designing the first five modes of the complementary antenna in the passband, the desired UWB response is achieved. To suppress the common-mode (CM) signals, instead of directly connecting to the complementary antenna, the differential feedline is deployed symmetrically across the input slotline so that weak coupling can be established when in CM operation. A 5.5-GHz notch band for preventing undesired WLAN signals is implemented by tapping λ/4 open stubs near the bisection plane. The differentially fed UWB complementary antenna have good differential-mode (DM) performance, high CM rejection, as well as low DM-to-CM conversion. The measured results show that the 10-dB DM passband is from 2.75 to 11.01 GHz, except the notch band; the CM reflection coefficient is greater than-2.62 dB and the DM-to-CM conversion is lower than-24.7 dB in the 2-12 GHz frequency range.

Original languageEnglish
Title of host publicationProceedings of the 2019 IEEE Asia-Pacific Microwave Conference, APMC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781728135175
Publication statusPublished - 2019 Dec
Event2019 IEEE Asia-Pacific Microwave Conference, APMC 2019 - Singapore, Singapore
Duration: 2019 Dec 102019 Dec 13

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2019 IEEE Asia-Pacific Microwave Conference, APMC 2019

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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