Miniaturized Circularly Polarized Square Slot Antenna With Enhanced Axial-Ratio Bandwidth Using an Antipodal Y-strip

A novel single-fed, wideband, circularly polarized slot antenna is proposed and fabricated. Wideband circular polarization is obtained by introducing an antipodal Y-strip to a square slot antenna. The feedline is a U-shaped microstrip line that provides a wide impedance bandwidth. The overall size o...

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Bibliographic Details
Published inIEEE antennas and wireless propagation letters Vol. 16; pp. 817 - 820
Main Authors Nosrati, Mehrdad, Tavassolian, Negar
Format Journal Article
LanguageEnglish
Published IEEE 01.01.2017
Subjects
Antenna measurements
Antenna radiation patterns
Antipodal Y-strip
Bandwidth
Broadband antennas
circular polarization
Polarization
Slot antennas
wideband antennas
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Summary:A novel single-fed, wideband, circularly polarized slot antenna is proposed and fabricated. Wideband circular polarization is obtained by introducing an antipodal Y-strip to a square slot antenna. The feedline is a U-shaped microstrip line that provides a wide impedance bandwidth. The overall size of the antenna is only 28 × 28 mm 2 (0.3 λ o × 0.3 λ o ). A prototype of the antenna is fabricated and tested. The measured bandwidths for the axial ratio (AR <; 3 dB) and relative impedance (|S 11 | <; -10 dB) are 41.3% (from 4.4 to 6.67 GHz) and 84% (from 3.25 to 8 GHz), respectively, and the antenna has a stable radiation pattern and a gain of greater than 3 dBi over the entire circular polarization frequency band.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2016.2605099