Two Types of Bandwidth Evaluation of Crossed Spherical Helix Antennas Using Numerical Simulation

IF 0.3 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC IEICE Communications Express Pub Date : 2024-06-11 DOI:10.23919/comex.2024XBL0038

Takuma Shimada;Mina Nishie;Keisuke Noguchi;Masato Odagaki;Keisuke Fujita

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Abstract

Comparing the bandwidths of a crossed spherical helix antenna (XSHA) and conventional antennas is challenging owing to significant change in the radiation efficiency with respect to frequency even at low voltage standing wave ratio (VSWR). Thus, two types of evaluation were performed in this work to demonstrate the wideband property of XSHA. First, the antennas were assumed to be made of a perfect conductor and were compared regarding only the VSWR bandwidth. Next, we compared the bandwidth at radiation efficiency of lossy antennas based on the generalized effective fractional bandwidth $(B_{e}).\ B_{e}$ is the product of the bandwidth and the radiation efficiency varying with frequency. Numerical simulations were conducted to compare the bandwidths for $VSWR \leq 3$ . The bandwidth of the XSHA is 2.19 and 2.11 times wider than those of single resonance antenna in lossless and lossy cases, respectively. Compared with a dual resonance antenna, the bandwidth of the XSHA is 1.36 times greater at acceptable radiation efficiencies of 50%.

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利用数值模拟评估两种交叉球面螺旋天线的带宽

交叉球形螺旋天线（XSHA）和传统天线的带宽比较具有挑战性，因为即使在电压驻波比（VSWR）较低的情况下，辐射效率也会随频率发生显著变化。因此，为证明 XSHA 的宽带特性，本研究进行了两种评估。首先，假定天线由完美导体制成，只比较驻波比带宽。B_{e}$ 是带宽和辐射效率随频率变化的乘积。我们进行了数值模拟，以比较 VSWR \leq 3$ 时的带宽。在无损和有损情况下，XSHA 的带宽分别是单谐振天线的 2.19 倍和 2.11 倍。与双谐振天线相比，在可接受的辐射效率为 50%时，XSHA 的带宽要大 1.36 倍。

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来源期刊

IEICE Communications Express ENGINEERING, ELECTRICAL & ELECTRONIC-

自引率

33.30%

发文量

114