Dual-band circularly polarized S-shaped slotted patch antenna with a small frequency-ratio

Nasimuddin*, Zhi Ning Chen, Xianming Qing

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

150 Citations (Scopus)

Abstract

A dual-band single-feed circularly polarized, $S$-shaped slotted patch antenna with a small frequency-ratio is proposed for GPS applications. An $S$-shaped slot is cut at the centre of a square patch radiator for dual-band operation. A single microstrip feed-line is underneath the center of the coupling aperture ground-plane. The frequency-ratio of the antenna can be controlled by adjusting the $S$-shaped slot arm lengths. The measured 10-dB return loss bandwidths for the lower and upper-bands are 16% (1.1031.297 GHz) and 12.5% (1.4441.636 GHz), respectively. The measured 3-dB axial-ratio (AR) bandwidth is 6.9% (1.1951.128 GHz) for the lower-band and 0.6% (1.5681.577 GHz) for the upper-band. The measured gain is more than 5.0 dBic over both the bands. The measured frequency-ratio is 1.28. The overall antenna size is 0.46 $\lambda-{o}\times 0.46 \lambda-{o}\times 0.086 \lambda-{o}$ at 1.2 GHz.

Original languageEnglish
Article number5439897
Pages (from-to)2112-2115
Number of pages4
JournalIEEE Transactions on Antennas and Propagation
Volume58
Issue number6
DOIs
Publication statusPublished - Jun 2010
Externally publishedYes

Keywords

  • Circular polarization
  • Circularly polarized antenna
  • Dual-band antenna
  • GPS antenna
  • Microstrip antenna
  • Slot
  • Slotted patch

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