Design of differentially fed CP circular slot antenna

Hsun Hsiang Chen, Guan Yu Lu, Yo Yu Lin, Ching Her Lee

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


This paper proposes a differentially fed antenna of circular polarization. The antenna is composed of a circular slot and two oppositely deployed semi-circular feeding metal strips. The circularly polarized (CP) antenna is designed in a rotationally symmetric fashion to give good differential-mode (DM) performance and high common-mode (CM) suppression. The circular slot antenna is loaded with stubs for tuning impedance matching and CP characteristic. A fabricated prototype circuit of the proposed differentially fed CP antenna was measured, and results show that the CP antenna has a 10-dB DM passband of 2.33-2.72 GHz and a 3-dB DM axial-ratio band of 2.38-2.51 GHz. In addition, within the passband, the CM signals can be effectively rejected since the CM return loss is less than 0.77 dB; the DM-to-CM conversion is negligible because it is smaller than-43.25 dB.

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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