A compact microstrip antenna for CP
A compact microstrip antenna for CP
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DOI：
10.1109/aps.1995.530181
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发表时间：
1995-06
期刊：
影响因子：
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通讯作者：
S. Dey;S. Chebolu;R. Mittra;I. Park;T. Kobayashi;M. Itoh
中科院分区：
文献类型：
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作者：
S. Dey;S. Chebolu;R. Mittra;I. Park;T. Kobayashi;M. Itoh
圆极化微带天线，包括单馈贴片，被广泛用作许多通信系统中的有效辐射器。然而，这些天线的最严重的缺点之一是，它们的轴比和阻抗带宽比传统的微波天线窄。实现宽带轴比带宽的常用技术是采用四个线性偏振元件，相对于相邻元件引入90/spl度/相位差。虽然这种设计具有宽带特性，但它有两个重要的缺点。首先，四个矩形微带贴片的要求使得天线结构庞大;其次，以适当的相位馈送所有四个元件需要复杂的馈电结构。在本文中，我们提出了一种新的设计，以克服这些困难。在我们的方法中，我们使用一个短路的矩形贴片，而不是一个传统的矩形，作为辐射元件，以减少天线的尺寸。而不是喂养所有四个元素，我们只激发两个相邻的补丁直接和其余两个寄生的方式。该技术降低了馈电结构的复杂性，并且使得能够以成本有效的方式制造天线。
Circularly polarized microstrip antennas, including single-fed patches, are widely used as effective radiators in many communication systems. However, one of the most serious drawbacks of these antennas is that their axial ratio and impedance bandwidth are narrower compared to those of the conventional microwave antennas. A commonly-employed technique to achieve broadband axial ratio bandwidth is to employ four linearly polarized elements, with a 90/spl deg/ phase differential introduced with respect to the adjacent ones. Although this design exhibits wideband characteristics, it has two important drawbacks. First, the requirement of four rectangular microstrip patches makes the antenna structure large; second, feeding of all the four elements with proper phase requires a complex feed structure. In this paper, we present a new design to overcome these difficulties. In our approach, we use a short-circuited rectangular patch, instead of a conventional rectangular one, as the radiating element to reduce the size of the antenna. Instead of feeding all the four elements, we excite only the two adjacent patches directly and the remaining two in a parasitic manner. This technique reduces the complexity of the feed structure, and enables the manufacturing of the antenna in a cost-effective manner.