Dual Polarized Shared Aperture Cavity Backed Antenna for K/Ka band operation

Krishna Tej Varma Nagaraju, Satish Srivastava, Gaurangi Gupta, K. Kumari, Rajesh Chivukula, A. Harish
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Abstract

In this paper, a dual band dual linear polarized printed antenna with ring shaped aperture as the radiating element is proposed. The radiating ring aperture is backed by a cavity that is fed by an aperture coupled microstrip line. H-shaped slots are used for coupling the microstrip line to the cavity due to their small size compared to a simple rectangular slot. Tapered gradient has been used in the H- shaped slots to increase the bandwidth and reduce the cross polar level. The proposed antenna uses a single radiating surface for dual band operation which makes the antenna low profile. A dual port slot coupled arrangement for both the bands poses several challenges thus a tightly packed arrangement of vias around the central aperture is used to improve the coupling between the two bands. The bandwidth achieved at K and Ka band are, 18.06% and 13.9% respectively, minimum element gain across the bands is 6.73 dBi and 5.15 dBi, minimum cross polarization levels are 26.9 dB and 32 dB with a small element of size $9\times 9$ mm. The proposed antenna can be used as an element of an array for satcom application.
用于K/Ka波段工作的双极化共享孔径腔背馈天线
本文提出了一种以环形孔径为辐射单元的双频双线极化印刷天线。辐射环形孔径后面有一个腔,该腔由孔径耦合微带线馈电。由于与简单的矩形槽相比,h形槽的尺寸较小,因此用于将微带线耦合到腔中。在H型槽中采用锥形梯度来增加带宽,降低交叉极电平。所提出的天线采用单一辐射面进行双波段操作,使天线外形较低。两个波段的双端口槽耦合布置提出了一些挑战,因此在中心孔径周围采用紧密排列的通孔布置来改善两个波段之间的耦合。该天线在K和Ka频段的带宽分别为18.06%和13.9%,各频段最小元件增益分别为6.73 dBi和5.15 dBi,最小交叉极化电平分别为26.9 dB和32 dB,元件尺寸为$9 × 9$ mm。
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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