What is it about?
A 3 dB axial-ratio (AR) bandwidth improvement of a circularly polarised printed monopole antenna using a lumped capacitor is presented. To demonstrate the effectiveness of this approach, a lumped capacitor is attached in the gap of an inverted-U-shaped patch antenna having a narrow 3 dB AR bandwidth. Simulation shows that the AR bandwidth improves from 4.1% (5.68–5.92 GHz) to 30.7% (4.33–5.9 GHz) with the use of a 0.5 pF capacitor. The measured results show a -10 dB impedance bandwidth of 60.5% (3.75–7 GHz), and a 3 dB AR bandwidth of 33.3% (4.25–5.95 GHz). The advantage of the proposed design is that the 3 dB AR bandwidth of an antenna can be easily tuned and extended with the use of only one lumped capacitor.
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Why is it important?
Due to the broadband CP operation in the entire 5 GHz WLAN bands, along with its extremely simple structure, the proposed antenna can be a key component for WLAN wireless systems.
Perspectives
A simple and effective method of using a single lumped capacitor to improve the CP bandwidth of a printed monopole antenna has been demonstrated on a patch antenna with a narrow CP band. The advantage of the proposed design is that by attaching a single lumped capacitor in the gap of the inverted-U-shaped patch, the 3 dB AR bandwidth of the antenna can be easily and significantly improved. The demonstrated antenna with a 0.5 pF capacitor showed a measured 3 dB AR bandwidth of 33.3% (4.25–5.95 GHz), an 8-fold improvement over the antenna without the lumped capacitor. Moreover, the overall antenna structure is extremely simple, making it easy to be integrated in various application systems.
Mr The Viet Hoang
Dongguk University
Read the Original
This page is a summary of: Bandwidth improvement of a circularly polarised printed monopole antenna using a lumped capacitor, Electronics Letters, June 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2016.1277.
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