Bandwidth and gain enhancement of composite right left handed metamaterial transmission line planar antenna employing a non foster impedance matching circuit board

Alibakhshikenari, Mohammad, Virdee, Bal Singh, Althuwayb, Ayman Abdulhadi, Azpilicueta, Leyre, Parchin, Naser Ojaroudi, See, Chan, Abd-Alhameed, Raed, Falcone, Francisco, Huynen, Isabelle, Denidni, Tayeb A. and Limiti, Ernesto (2021) Bandwidth and gain enhancement of composite right left handed metamaterial transmission line planar antenna employing a non foster impedance matching circuit board. Scientific Reports, 11 (7472). pp. 1-11. ISSN 2045-2322

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Abstract / Description

The paper demonstrates an effective technique to significantly enhance the bandwidth and radiation gain of an otherwise narrowband composite right/left-handed transmission-line (CRLH-TL) antenna using a non-Foster impedance matching circuit (NF-IMC) without affecting the antenna’s stability. This is achieved by using the negative reactance of the NF-IMC to counteract the input capacitance of the antenna. Series capacitance of the CRLH-TL unit-cell is created by etching a dielectric spiral slot inside a rectangular microstrip patch that is grounded through a spiraled microstrip inductance. The overall size of the antenna, including the NF-IMC at its lowest operating frequency is 0.335λo × 0.137λo × 0.003λo, where λo is the free-space wavelength at 1.4 GHz. The performance of the antenna was verified through actual measurements. The stable bandwidth of the antenna for |S11|≤ − 18 dB is greater than 1 GHz (1.4–2.45 GHz), which is significantly wider than the CRLH-TL antenna without the proposed impedance matching circuit. In addition, with the proposed technique the measured radiation gain and efficiency of the antenna are increased on average by 3.2 dBi and 31.5% over the operating frequency band.

Item Type: Article
Uncontrolled Keywords: bandwidth; radiation gain; metamaterial transmission line planar antenna; narrowband composite right/left-handed transmission-line (CRLH-TL) antenna; non-Foster impedance matching circuit (NF-IMC)
Subjects: 600 Technology > 620 Engineering & allied operations
Department: School of Computing and Digital Media
Depositing User: Bal Virdee
Date Deposited: 07 Apr 2021 10:07
Last Modified: 07 Apr 2021 10:07
URI: http://repository.londonmet.ac.uk/id/eprint/6493

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