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Design and analysis of wideband U‐slot patch antenna with U‐shaped parasitic elements
Author(s) -
Lu HuaXiao,
Liu Fang,
Su Ming,
Liu YuanAn
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21202
Subject(s) - wideband , patch antenna , microstrip , equivalent circuit , microstrip antenna , physics , acoustics , antenna (radio) , bandwidth (computing) , transmission line , electrical impedance , electronic engineering , electrical engineering , telecommunications , optics , engineering , voltage
A single layer single probe‐fed wideband microstrip antenna is presented and investigated. By cutting a U‐slot in the rectangular patch, and by incorporating two identical U‐shaped parasitic patches around both the radiating edges and the nonradiating edges of the rectangular patch, three resonant frequencies are excited to form the wideband performance. Details of the antenna design is presented. The measured and simulated results are in good agreement, the measured impedance bandwidth is 1.44 GHz ( 4.82 ‐ 6.26 GHz), or 26.2 % centered at 5.5 GHz, which covers WLAN 5.2 GHz ( 5.15 ‐ 5.35 GHz), WLAN 5.8 GHz ( 5.725 ‐ 5.825 GHz), and WIMAX 5.5 GHz ( 5.25 ‐ 5.85 GHz) bands. The measured peak gains at the three resonant frequencies are 7 . 73 dB, 7 . 01 dB, and 4 . 55 dB, respectively. An equivalent circuit model which is based on the transmission line theory, the asymmetric coupled microstrip lines theory, and the π‐network theory is established. This equivalent circuit model is used to give an insight into the wideband mechanism of the proposed antenna, and is also used to explain why the three resonant frequencies shift at the variations of different parameters from a physical point of view. The error analysis is given to demonstrate the validity of the equivalent circuit model.