Low-Profile Circularly Polarized Array With Gain Enhancement and RCS Reduction Using Polarization Conversion EBG Structures
A planar antenna array based on checkerboard polarization conversion electromagnetic band-gap (CPC EBG) structures with wideband circular polarization and low radar cross section (RCS) is presented. The array is formed by 2\times 2 circularly polarized (CP) element antennas fed with a sequential f...
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Veröffentlicht in: | IEEE transactions on antennas and propagation 2020-03, Vol.68 (3), p.2440-2445 |
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Sprache: | eng |
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Zusammenfassung: | A planar antenna array based on checkerboard polarization conversion electromagnetic band-gap (CPC EBG) structures with wideband circular polarization and low radar cross section (RCS) is presented. The array is formed by 2\times 2 circularly polarized (CP) element antennas fed with a sequential feeding network. On the one hand, CP radiation is obtained due to the polarization conversion characteristic of the metamaterials. A sequentially rotated feeding network is employed for wide operating bandwidth, polarization purity, and radiation pattern symmetry. The measured results show that the array has a wide usable bandwidth of 18.4%, the common part of an impedance bandwidth of 37.3% (4.80-7.00 GHz), a 3 dB axial ratio (AR) bandwidth of 22.5% (5.00-6.27 GHz), and a 3 dB gain bandwidth of 18.4% (4.94-5.94 GHz). On the other hand, the checkerboard arrangement of the EBG structure generates both an in-band and a partial out-band RCS reduction under normal incidence for both x - and y -polarizations. Besides, the proposed array achieves a significant gain enhancement compared to the traditional slot array. The experimental and simulated results are in good agreement. |
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ISSN: | 0018-926X 1558-2221 |
DOI: | 10.1109/TAP.2019.2943693 |