Dual‐polarized filtering antenna and its application for compact multi‐array

• Published in: Microwave and optical technology letters Vol. 65; no. 12; pp. 3289 - 3295
• Main Authors: Wu, Rui, Lin, Jian‐Hong, Chen, Fu‐Chang, Cao, Wei‐Ping, Yuan‐Liu, Cai, Shu‐Ting, Chu, Qing‐Xin, Xue, Quan
• Format: Journal Article
• Language: English
• Published: New York Wiley Subscription Services, Inc 01.12.2023
• Subjects: Antenna arrays; Antenna radiation patterns; Filtration; Parasitic elements (antennas); Patch antennas
• ISSN: 0895-2477; 1098-2760
• DOI: 10.1002/mop.33855

Abstract This article presents a ±45° dual‐band dual‐polarized filtering antenna. The filtering antenna element is a dual‐polarized patch antenna that loads a parasitic patch with two rectangle slots to achieve compact multi‐array. Multi‐array consists of three 1×2 subarrays arranged, which are designed for 1.8/2.1 GHz FDD band applications. Very close‐arranged antennas exhibit radiation pattern invariance as well as in‐band radiation property. Radiation patterns are conformal with a compact subarray distance of 45 mm (0.29λ 0 ), which is 56% smaller than that of the array using traditional filtering elements. Moreover, the total width is only 180 mm for three subarray‐composed antenna arrays. The average gain is 8.7 dBi with a low profile of 0.069λ 0 . The proposed array exhibits the filtering property of the subarrays with a very simple structure.