Omnidirectional Circularly Polarized Antenna Utilizing Zeroth-Order Resonance of Epsilon Negative Transmission Line
Омнинаправленная кругополяризованная антенна, использующая резонанс нулевого порядка линейки передачи с отрицательной диэлектрической проницаемостью
2011-05-10
SCID: 54.1/dyb3hkpk
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axial ratio and LH CP gaincircular mushroom structure with curved branchesepsilon negative (ENG) transmission lineomnidirectional circularly polarized antennazeroth-order resonance (ZOR)
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Abstract (AI)
The omnidirectional circularly polarized (CP) antenna using a circular mushroom structure with curved branches is proposed. The antenna is based on the zeroth-order resonance (ZOR) mode of epsilon negative (ENG) transmission line (TL) to obtain a vertical polarization and an omnidirectional radiation pattern. Also, the horizontal polarization is obtained by the curved branches. The 90° phase difference between two orthogonal polarizations is inherently provided by the zeroth-order resonator. Therefore, the antenna has an omnidirectional CP radiation pattern in the azimuthal plane. In addition, this antenna is planar type and simply designed without a dual feeding structure and 90° phase shifter. The measured average axial ratio and left-hand (LH) CP gain are 2.03 dB and - 0.40 dBic, respectively, in the azimuthal plane.
Key Findings
1
An omnidirectional circularly polarized antenna is realized using a circular mushroom structure with curved branches.
2
Horizontal polarization is achieved via the curved branches, enabling two orthogonal polarizations with a 90° phase difference inherently provided by the zeroth-order resonator.
3
Measured average axial ratio in the azimuthal plane is 2.03 dB and measured left-hand circularly polarized (LHCP) gain is -0.40 dBic.
4
The antenna exploits zeroth-order resonance (ZOR) of an epsilon negative (ENG) transmission line to produce vertical polarization and omnidirectional radiation.
5
The design is planar and simple, requiring no dual feeding structure or external 90° phase shifter.
Research Object
Omnidirectional circularly polarized antenna based on a circular mushroom structure with curved branches implementing an epsilon-negative transmission-line zeroth-order resonator
Research Subject
Generation of omnidirectional circular polarization in the azimuthal plane via vertical polarization from the ENG transmission-line zeroth-order resonance and horizontal polarization from curved branches, producing inherent 90° phase difference without dual feed or external phase shifter; reported axial ratio and LHCP gain performance
Publication Details
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2011-05-10
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