A 1×8 linear ultra-wideband phased array with connected dipoles and hyperbolic microstrip baluns

He, Ruoyu, Zhang, Hongbo, See, Chan ORCID: 0000-0001-8439-7321, Su, Yan, Ma, Yue, Kong, Deqing, Zhu, Xinying and Abd-Alhameed, R.A. (2018) A 1×8 linear ultra-wideband phased array with connected dipoles and hyperbolic microstrip baluns. IEEE Access, 6. pp. 52953-52968. ISSN 2169-3536

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Abstract

A 1×8 linear single polarized ultra-wideband connected dipole phased array with wide angle scan range is proposed. The dipoles in the array are connected with each other in E-plane to improve the impedance matching on the low end of the frequency band. The frequency band and the scan range in E-plane is 2~9 GHz for broadside radiation, 2~8 GHz for 30° scan, 2~7 GHz for 45° scan, and 2~6.5GHz for 60° scan. The VSWR is better than 2.0 across the frequency band from 2 to9 GHz for broadside radiation and the cross-polarization level is below -10dB. A hyperbolic microstrip balun is used as an impedance transformer to connect the 50Ω SMA connector to a 150 Ω broadband dipole in an array. The structure of this antenna is totally planar and low profile, thus it is made easy to integrate with the PCB boards. To eliminate the surface wave blindness, no other dielectric layer is used in the array. The proposed balun supports Common Mode (CM) current and the radiation of this CM current cancels the radiation of the dipole in some frequency for a certain scan angle, this results in Feed Blindness. Adding H-Plane PEC walls decreases the Feed Blindness frequency in the design.

Item Type: Article
Additional Information: This article is the authors accepted version, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/ACCESS.2018.2868779, IEEE Access
Uncontrolled Keywords: Connected dipole, feed blindness, hyperbolic microstrip balun, H-plane PEC walls, low profile array, ultra-wideband array, wide-angle scanning array
Divisions: School of Engineering > Engineering
Depositing User: Tracey Gill
Date Deposited: 12 Sep 2018 14:55
Last Modified: 02 Nov 2018 15:09
Identification Number: 10.1109/ACCESS.2018.2868779
Funders: National Natural Science Foundation of China (NSFC) under Grant 11303058 and Grant 11503049, Joint Research Fund in Astronomy under Grant U1431104
URI: http://ubir.bolton.ac.uk/id/eprint/1932

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