Bifocal Polarization Insensitive Fresnel Lens Tuning Using Lubricant Oil for MM-Wave Applications

IF 6.9 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Amit Kumar Baghel;Vinicius Uchoa Oliveira;Pedro Pinho;Nuno Borges Carvalho
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Abstract

In this paper, the synergy between use of lubricant oil (Loil) in Fresnel zone lens (FZL) for focal length (FL) tuning for the first time in 27–30GHz band is proposed. This is achieved by filling the cavity of FZL with the Loil according to the required FL of 50 and 142mm. The FL is achieved for both TE ($E_{x}$) and TM ($E_{y}$) polarization, thus providing polarization insensitive tuning. To minimize the impact of the FZL walls on tuning performance, the FZL is additively manufactured with controlled infill percentage and pattern. The Loil and walls of the FZL are characterized for their dielectric constant and loss tangent at 28 GHz using cavity resonator and free-space methods, respectively. In addition, an average increase of 7.4 dBi (5.49 times improvement in the received power) in the realized gain is achieved throughout the band with maximum gain of 22.5 dBi (meas: 20.2 dBi) around 28GHz. Also, the average efficiency of the FZL is 89% throughout the band, thus having very low insertion loss. Because the FZL provides dual polarization, the data throughput is increased by utilizing orthogonal polarization simultaneously for the bifocal case in mm-wave communication. Also, due to the improvement in the realised gain of the transmitting antenna, the proposed solution is also suitable for the wireless power transfer applications. The measurements were conducted to validate the simulation results.
双焦偏振不敏感菲涅耳透镜在毫米波应用中的润滑油调谐
本文首次提出了在27-30GHz频段使用菲涅耳带透镜(FZL)中使用润滑油(oil)进行焦距调谐的协同效应。这是通过根据所需的50和142mm的高度填充FZL的腔来实现的。对于TE ($E_{x}$)和TM ($E_{y}$)极化均可实现FL,从而提供极化不敏感调谐。为了最大限度地减少FZL壁对调谐性能的影响,FZL是用控制填充百分比和图案的增材制造的。利用腔腔谐振器和自由空间方法分别对FZL的介电常数和损耗正切进行了表征。此外,在整个频段内,实现增益平均增加7.4 dBi(接收功率提高5.49倍),在28GHz附近实现最大增益22.5 dBi(平均值:20.2 dBi)。此外,FZL在整个频段的平均效率为89%,因此具有非常低的插入损耗。由于FZL提供双偏振,因此在毫米波通信双焦情况下,同时利用正交偏振可以提高数据吞吐量。此外,由于提高了发射天线的实现增益,该方案也适用于无线电力传输应用。通过测量验证了仿真结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
10.70
自引率
0.00%
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审稿时长
8 weeks
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