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Air gap effect on antenna characteristics of slitline and stripline dipoles on an extended hemispherical lens substrate
Abstract
This paper presents the effect of an air gap introduced between a planar feed and an extended hemispherical lens on the antenna's impedance, current distribution and radiation characteristics. Two selected planar feeds for study are slitline dipole and stripline dipole. The results showed that as a small gap is introduced, the input impedance of the slitline dipole was almost remained unchanged while that of the stripline dipole was changed remarkably. More importantly, the boresight gain and radiation efficiency of the slitline dipole was improved whereas those of the stripline dipole were degraded with the presence of this air gap. An overall performance comparison for these two designs will be detailed in the paper. This study provides useful guidelines of choosing the proper feed for THz integrated lens antenna applications, especially for indoor THz communication applications such as wireless local area networks and wireless personal area networks in the 300 GHz band.
Ceramic (Ba0.55Sr0.45Ti1.01O3) – polypropylene polymer ER182 composites-based materials were applied for sub-THz range antenna lens application in telecommunications. Typical plano-convex -shaped lenses were simulated and measured with a standard rectangular waveguide at 220–330 GHz frequency band and applied on 150 mm on-air distance. The lens fabricated with ER182 polymer material increased the signal strength by 15 dB, ER182/7 vol% BST by 6 dB and ER182/30 vol% BST by −23 dB. Material loss tangent values were 0.008 for ER182, 0.034 for ER182/7%BST and 0.081 for ER182/30%BST. The directivity of ER182 material lens and WR3 waveguide combination was 26 dBi at 300 GHz.
In telecommunications (5G/6G) lenses can be used to manipulate the electric field emitted by an antenna. In this paper different permittivity lenses were studied with 3×3 dipole array acting as antenna source. Iterative study to the lens eccentricity showed different lenses for different permittivity where a low permittivity lens with heavily eccentric shape increased antenna gain by 14.6 dB and high permittivity lens gain by 9.9 dB and the total gain was 32 dB for low permittivity lens and 27 dB for higher permittivity lenses. With high permittivity lenses the whole lens surface was not illuminated by the feeding antenna.
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