Abstract
A post-wall-structured tapered slot antenna (PWTSA) loaded with an embedded metamaterial-based lens (metalens) is proposed and investigated for short-pulse applications. The proposed embedded metalens consists of not only a metallic delay lens, but also an airy acceleration region surrounding the lens, which is different from the conventional metalenses used in various tapered slot antennas and can exhibit a small equivalent permittivity. Therefore, the embedded metalens has a large usable range of permittivity and does not increase the size of the original prototype PWTSA. The post-wall structure and metalens of the proposed antenna can help it achieve a comprehensive and balanced performance, including a high fidelity, low cross-polarization, stable main-lobe direction and gain enhancement. The simulated and measured results show that without any increase in antenna size, the proposed antenna enhances the realized gain by 6.4 dB over the frequency range from 9 to 26 GHz and achieves a stable radiation with the offset of the main-lobe direction being confined to 2° up to 24.9 GHz. Furthermore, the cross-polarization levels are less than −20 dB and the fidelity is kept high for the short-pulse radiation with the frequency spectrum up to 30 GHz.
Highlights
Tapered slot antenna (TSA) is an end-fire travelling wave antenna with a low profile, wide impedance bandwidth, moderate gain, symmetrical radiation patterns, and good time-domain characteristics [1,2]
From the discussion given in previous sections, the phase adjustment by the metallic delay lens and the airy acceleration region is more effective in the high frequency band because the12phase difference in the aperture surface is larger in this band
A post-wall-structured tapered slot antenna with a metalens loaded in the radiation aperture was proposed for wideband radiation enhancement
Summary
Tapered slot antenna (TSA) is an end-fire travelling wave antenna with a low profile, wide impedance bandwidth, moderate gain, symmetrical radiation patterns, and good time-domain characteristics [1,2]. 8.5–11.2 dBi to 9.35–12 dBi in the frequency band of 24.75–28.35 GHz compared to the unloaded antenna array Another gain improvement technique for TSA is to use loading metallic structures, such as surface plasmon polaritons, metal patches or strips, and non-resonant artificial material, in the end-fire direction of the antenna to improve the radiation directivity in a quite broad band [30,31,32,33,34,35,36,37,38]. The post-wall structure and metalens of the proposed antenna can help it achieve a comprehensive and balanced performance, including a compact size, a high fidelity, a low cross-polarization, stable main-lobe direction and gain enhancement.
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