Dual-Band Dual-Circularly-Polarized Cavity Backed Antenna

S. I. Abd El-Rahman, A. Attiya
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Abstract

In this paper, we present a dual-band dual-circular polarized (CP) cavity backed 4×4 antenna array. This antenna can be used as a feeding antenna for Ka band satellite communication system. The operating center frequencies are 18GHz with RHCP and 28 GHz with LHCP. The required band width is 0.5 GHz. The proposed antenna element consists of a square cavity-backed structure with 4×4 radiating circular apertures. The feeding of this cavity-backed is a square aperture in the backside. The feeding network consists of two series of cavities fed by two orthogonal waveguide feeding networks. The upper feeding network is tuned at the lower frequency 18 GHz, while, the lower feeding network is tuned at the higher frequency 28 GHz. These antenna elements are supplied with using a rotating sequential feeding network. According to the direction of rotation and the sequential phase shift between the elements, it would be possible to obtain RH or LH circular polarization.
双频双圆极化腔背天线
在本文中,我们提出了一种双频双圆极化(CP)腔背馈4×4天线阵列。该天线可作为Ka波段卫星通信系统的馈电天线。操作中心频率在RHCP时为18GHz,在LHCP时为28ghz。所需带宽为0.5 GHz。所提出的天线元件由具有4×4辐射圆孔的方形腔背结构组成。这种空腔的进料是在背面的一个方形孔。馈电网络由两个正交波导馈电网络馈电的两串空腔组成。上馈电网络在低频18ghz调谐,下馈电网络在高频28ghz调谐。这些天线元件使用旋转顺序馈电网络提供。根据旋转方向和元件之间的顺序相移,可以得到RH或LH圆偏振。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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