Qiao, Z L; Wang, Z P; Loh, T H; Gao, S; Miao, J G (2019) A Compact Minimally Invasive Antenna for OTA Testing. IEEE Antennas and Wireless Propagation Letters, 18 (7). pp. 1381-1385. ISSN 1536-1225

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Abstract

This paper presents a compact dual-polarized probe antenna with low radar cross section (RCS) for over-the-air (OTA) testing of the fifth-generation (5G) and emerging wireless communication systems. The proposed antenna design is achieved by slotting two orthogonal Vivaldi antennas in a cross shaped form into a two-part three-dimensional (3D) printed radome and loading microwave absorbing materials (MAMs) at the antenna outer edges. The antenna has a rockets nest shape with a diameter of 63.4 mm and 113.68 mm length. The -10 dB impedance bandwidth (S11) is from 2.1 up to 6 GHz. The two-part radome is formed, respectively, by polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS) dielectric materials. Their respective dielectric constants are approximately 2.6 and 4.5 within the -10 dB impedance bandwidth. The MAMs geometry and distribution location are optimized to suppress induced current over the antenna. An antenna prototype has been fabricated and measured. The measured results agree reasonably well with the simulated results. The results show that the use of the two-part radome enable achievement of low-RCS with compact form factor. Furthermore, a low bistatic RCS between 1.5 and 6 GHz is observed in simulation for angular ranges of Theta within {-30,+30} and Phi within {-30,+30}.

Item Type:	Article
Keywords:	Fifth-generation (5G), over-the-air (OTA) testing, Vivaldi antenna, radar cross section (RCS), three-dimensional (3D)-printing
Subjects:	Electromagnetics > Wireless Communications
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1109/LAWP.2019.2917087
Last Modified:	23 Oct 2019 10:55
URI:	https://eprintspublications.npl.co.uk/id/eprint/8532