Differentially fed CP antenna with quasi-self-complementary semicircular-ring structure

Ching-Her Lee, Wanchu Hong, Wen Jie Chen, Chung I.G. Hsu

Research output: Contribution to journalArticle

Abstract

This article presents a new design of a common-mode suppressed differentially fed circularly polarized (CP) antenna using a quasi-self-complementary (QSC) structure. The antenna radiating element consists of a semicircular-ring radiating patch and its complementary radiating slot counterpart. The design idea for producing CP radiation is based on field orthogonality of the QSC structure. For better impedance matching, a fan-shaped notch (stub) around the feeding position was cut from (implemented in) the semicircular radiating patch (slot). In addition, to improve the axial ratio, a QSC semielliptical structure is embedded in the central area of the antenna. For the designed differentially fed CP antenna, measurement shows that the differential-mode (DM) operating band with return loss >10 dB covers 4.76-6.38 GHz. The measured DM 3-dB axial-ratio band is 4.95-5.43 GHz. Also, very good common-mode (CM) suppression is observed with the measured CM reflection coefficient >−1.21 dB in 4.50-6.5 GHz.

Original languageEnglish
Pages (from-to)741-746
Number of pages6
JournalMicrowave and Optical Technology Letters
Volume61
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1

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ring structures
Antenna feeders
antennas
Antennas
slots
polarized radiation
impedance matching
Fans
orthogonality
notches
fans
Radiation
retarding
reflectance
rings

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "This article presents a new design of a common-mode suppressed differentially fed circularly polarized (CP) antenna using a quasi-self-complementary (QSC) structure. The antenna radiating element consists of a semicircular-ring radiating patch and its complementary radiating slot counterpart. The design idea for producing CP radiation is based on field orthogonality of the QSC structure. For better impedance matching, a fan-shaped notch (stub) around the feeding position was cut from (implemented in) the semicircular radiating patch (slot). In addition, to improve the axial ratio, a QSC semielliptical structure is embedded in the central area of the antenna. For the designed differentially fed CP antenna, measurement shows that the differential-mode (DM) operating band with return loss >10 dB covers 4.76-6.38 GHz. The measured DM 3-dB axial-ratio band is 4.95-5.43 GHz. Also, very good common-mode (CM) suppression is observed with the measured CM reflection coefficient >−1.21 dB in 4.50-6.5 GHz.",
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Differentially fed CP antenna with quasi-self-complementary semicircular-ring structure. / Lee, Ching-Her; Hong, Wanchu; Chen, Wen Jie; Hsu, Chung I.G.

In: Microwave and Optical Technology Letters, Vol. 61, No. 3, 01.03.2019, p. 741-746.

Research output: Contribution to journalArticle

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