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2020-10-13

Decoupling of Dual-Band Microstrip Antenna Array with Hybrid Resonant Structure

By Xin-Hong Li
Progress In Electromagnetics Research Letters, Vol. 94, 9-17, 2020
doi:10.2528/PIERL20073002

Abstract

A novel hybrid resonant structure is proposed to decouple a dual-band microstrip antenna array. The decoupling structure is composed of two H-shaped strips, and the lower and upper ones respectively collaborate with an X-shaped slot to reduce mutual coupling at 4.5 GHz and 5.5 GHz. Two sub-patches of different sizes share a connection feeding line to construct the dual-band array element, which is arranged along H-plane with the edge-to-edge spacing 0.15 λl and 0.24λhl and λh are the free-space wavelengths of 4.5 GHz and 5.5 GHz, respectively). Simulated and measured results indicate that through loading the hybrid resonant structure, 31.6dB and 24.0dB reductions of mutual coupling at two frequencies are obtained, while the levels of coupling coefficients are both below -30 dB in two operating bands. Moreover, the modified radiation patterns, improved diversity metrics and weakened coupled current distributions further verify its superior decoupling capability. The proposed decoupling structure reveals its promise in being employed in communication system and multielement linearly antenna arrays.

Citation


Xin-Hong Li, "Decoupling of Dual-Band Microstrip Antenna Array with Hybrid Resonant Structure," Progress In Electromagnetics Research Letters, Vol. 94, 9-17, 2020.
doi:10.2528/PIERL20073002
http://www.jpier.org/PIERL/pier.php?paper=20073002

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