Design and analysis of wideband U‐slot patch antenna with U‐shaped parasitic elements |
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| Authors: | Hua‐Xiao Lu Fang Liu Ming Su Yuan‐An Liu |
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| Affiliation: | Beijing University of Posts and Telecommunications, School of Electronic Engineering, No. 10 Xitucheng Road, Haidian District, Beijing, China |
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| Abstract: | 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  GHz ( GHz), or  centered at  GHz, which covers WLAN  GHz (  GHz), WLAN  GHz (  GHz), and WIMAX  GHz (  GHz) bands. The measured peak gains at the three resonant frequencies are  dB,  dB, and  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. |
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| Keywords: | circuit model microstrip antennas U‐shaped U‐slot wideband |
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GHz (
GHz), or 
centered at 
GHz, which covers WLAN 
GHz ( 
GHz), WLAN 
GHz ( 
GHz), and WIMAX 
GHz ( 
GHz) bands. The measured peak gains at the three resonant frequencies are 
dB, 
dB, and 
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.