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Bandwidth-Enhanced Circularly Polarized Spiral Antenna With Compact Size
- Source :
- IEEE Access, Vol 8, Pp 41246-41253 (2020)
- Publication Year :
- 2020
- Publisher :
- IEEE, 2020.
-
Abstract
- A compact circularly polarized (CP) spiral antenna with enhanced impedance and 3-dB axial ratio (AR) bandwidths that is fed by a tapered coax balun is presented. The antenna is composed of a two-arm nonself-complementarity planar equiangular spiral, a z-directional helix, absorbing material with a stepped cylindrical honeycomb structure, and a ground plane. The z-directional helix is used to extend the current path and to improve the impedance matching and AR in the low-frequency band. The coupling between the nonself-complementarity planar spiral arms is increased, which improves the impedance matching in the low-frequency band and the AR at approximately 5.55 GHz. The stepped cylindrical absorbing material can reduce the reverse current and improve the AR in the high-frequency band. The measured results show that the impedance bandwidth and 3-dB AR bandwidths range from 0.5 to 6 GHz and from 0.5 to 5.8 GHz, respectively. The overall size of the proposed antenna is 0.189λL × 0.065λL (diameter × height, where λL is the free-space wavelength at the starting frequency).
Details
- Language :
- English
- ISSN :
- 21693536
- Volume :
- 8
- Database :
- Directory of Open Access Journals
- Journal :
- IEEE Access
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.423d729123c4c8580028251aebee570
- Document Type :
- article
- Full Text :
- https://doi.org/10.1109/ACCESS.2020.2976705