ENVELOP Antenna: A Class of Very Low Profile UWB Directive Antennas for Radar and Communication Diversity Applications
ENVELOP Antenna: A Class of Very Low Profile UWB Directive Antennas for Radar and Communication Diversity Applications
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DOI：
10.1109/tap.2012.2229951
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发表时间：
2013-03
影响因子：
5.7
通讯作者：
A. Elsherbini;K. Sarabandi
中科院分区：
文献类型：
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作者：
A. Elsherbini;K. Sarabandi
在本文中，我们提出了用于低频雷达和分集通信应用的新型电窄超薄（ENVELOP）定向天线的概念。基本结构由短 TEM 喇叭和感应环形天线组成。建议的天线高度为 0.063，其中 是最小工作波长，并且在超过一个倍频程内具有良好的匹配和辐射特性。它基于电偶极子和磁偶极子交叉的原理，其中TEM喇叭作为电偶极子，片环作为磁偶极子。然而，与标准结构不同，所提出的结构旨在增强垂直于 TEM 喇叭轴方向的辐射。这将最大方向图带宽限制为大约一个倍频程，但允许沿最大辐射方向的天线高度非常小，这对于机载雷达和需要共形天线的低频军事通信非常重要。还提出了基本结构的三种不同变体，其提供了改进的图案特性和/或图案和偏振多样性。制作并测量了两个天线。测量结果与仿真结果吻合良好，均表明该天线可在 1-2 GHz 范围内工作，具有一致的辐射方向图、低色散和输入阻抗匹配性能。
In this paper we present the concept of new electrically narrow very low profile (ENVELOP) directive antennas for low frequency radars and diversity communication applications. The basic structure consists of a short TEM horn combined with an inductive loop antenna. The proposed antenna height is 0.063 where is the minimum operating wavelength and has good matching and radiation characteristics over more than an octave. It is based on the principle of crossed electric and magnetic dipoles with a TEM horn as the electric dipole and a sheet loop as the magnetic dipole. However, unlike the standard structures, the proposed structure is designed to enhance the radiation in a direction perpendicular to the TEM horn axis. This limits the maximum pattern bandwidth to about one octave but allows the antenna height along the direction of maximum radiation to be very small which is very important for airborne radars and in low frequency military communications that require conformal antennas. Three different variations of the basic structure are also presented which offer improved pattern characteristics and/or pattern and polarization diversity. Two antennas were fabricated and measured. The measured results agreed well with the simulation results and both showed that the antenna can operate over 1-2 GHz with consistent radiation pattern, low dispersion and input impedance matching performance.