Development of an Omnidirectional and Low-VSWR Ultra Wideband Antenna
Development of an Omnidirectional and Low-VSWR Ultra Wideband Antenna
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全向低驻波比超宽带天线的研制
DOI：
10.1142/s0219799506000442
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Takehiko Kobayashi
中科院分区：
文献类型：
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作者：
T. Taniguchi;Akihide Maeda;Takehiko Kobayashi
本文报道了一个全向方位和低电压驻波比（VSWR）超宽带（UWB）的天线，我们作为一个原型构造的联邦通信委员会批准的UWB频段（3.1-10.6 GHz）。大多数宽带天线（例如双脊波导喇叭，单锥天线）不能同时满足全向和低VSWR的要求，对于一些UWB测量应用至关重要。天线由一个圆形的接地平面和一个泪滴组成，泪滴被定义为一个有限的圆锥体和一个内接在圆锥体底部的球体的组合。该天线既可以看作是一个圆形的有限单锥天线，也可以看作是一个简化的火山烟天线。假设激励为50 Ω，搜索最佳半锥角，以使3.1和10.6 GHz之间的最大VSWR最小化，结果发现约为48°。制作了一个原型天线，并测量了其驻波和辐射特性。原型天线表现出全向辐射和低VSWR（< 1.3）在3和20 GHz之间。将该天线与具有代表性的双脊波导喇叭天线、弯折线天线和对数周期偶极子阵列天线进行了性能比较。采用3天线法实现了高精度的绝对增益测量。
This paper reports an omnidirectional-in-azimuth and low voltage-standing-wave-ratio (VSWR) ultra-wideband (UWB) monopole antenna that we constructed as a prototype for the Federal Communications Commission-approved UWB frequency band (3.1–10.6 GHz). Most wideband antennas (e.g. double-ridged waveguide horn, monocone antenna) do not simultaneously meet omnidirectional and low-VSWR requirements, essential for some UWB measurement applications. The antenna consists of a circular ground plane and a teardrop that is defined as a combination of a finite cone and a sphere inscribed inside the cone at the cone's base. This antenna can be considered either as a rounded finite monocone antenna or as a simplified volcano smoke antenna. Assuming 50-Ω excitation, the optimum half-cone angle was searched to minimize the maximum VSWR between 3.1 and 10.6 GHz and found to be around 48°. A prototype antenna was constructed and its VSWR and radiation characteristics were measured. The prototype antenna demonstrated omnidirectional radiation and low VSWR (< 1.3) between 3 and 20 GHz. Performance comparison was made between this antenna and other representative wideband antennas: double-ridged-waveguide horn antenna, meander line antenna, and log-periodic dipole array antenna. The 3-antenna method was used to achieve high accuracy in the absolute gain measurements.