介质加载螺旋天线辐射特性的数值与计算分析,International Journal of RF and Microwave Computer-Aided Engineering

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介质加载螺旋天线辐射特性的数值与计算分析
International Journal of RF and Microwave Computer-Aided Engineering ( IF 0.9 ) Pub Date : 2021-05-19 , DOI: 10.1002/mmce.22756
Ajay Kumar Pandey _{1,

2} , Surya Kumar Pathak _{1,

2}

Affiliation

在本文中，基于场论方法提出了一种全波分析理论，并通过数值求解来计算介电负载螺旋天线（DLHA）的辐射特性。首先，色散方程是从受必要边界条件约束的无源麦克斯韦方程中解析导出的。然后使用场论方法推导出DLHA的辐射特性。在 DLHA 的情况下，首次解决了由电介质引起的极化电流对辐射特性的影响。所有数值分析均在MATLAB中进行。为了进一步验证结果，使用 CST Microwave Studio 软件进行计算分析。从结果来看，据观察，当天线 (C) 的周长与对应于工作频率的波长 (λ) 相当时，波沿轴向通过螺旋线轴向传播并沿端射方向辐射，而当周长不等于波长，则波沿法线方向辐射并沿轴向衰减。此外，由于聚四氟乙烯负载，天线的阻抗带宽从 2.5% 增加到 52.9%，增益从 8.35 dB 增加到 11.5 dB。最后，制作、测量天线原型，并与数值和计算结果进行比较。发现分析、计算和测量结果之间非常一致。

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Numerical and computational analysis of radiation characteristics of dielectric loaded helical antenna

In this paper, a full-wave analytical theory has been proposed based on the field theory approach and numerically solved for computing radiation properties of the dielectric-loaded helical antenna (DLHA). First, the dispersion equation is analytically derived from the source-free Maxwell equation subject to necessary boundary conditions. Then radiation characteristics of DLHA are derived using the field theory approach. The effect of polarization current arising due to dielectric on radiation properties is addressed for the first time in the case of DLHA. All the numerical analysis is carried out in MATLAB. To further validate the results, computation analysis is carried out using CST Microwave Studio Software. From the result, it was observed that when the circumference of the antenna (C) is comparable to the wavelength (λ) corresponding to operating frequency then the wave propagates axially through the helical wire in the axial direction and is radiated in the end-fire direction whereas when the circumference is not equal to the wavelength then the wave gets radiated in the normal direction and attenuated in the axial direction. Also, the impedance bandwidth of the antenna is increased from 2.5% to 52.9% and the gain is increased from 8.35 dB to 11.5 dB due to teflon loading. Finally, the antenna prototype is fabricated, measured, and compared with the numerical and computational results. A close agreement between the analytical, computational, and measurement results are found.

更新日期：2021-05-19

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