4.7 Article

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

期刊

SCIENTIFIC REPORTS
卷 11, 期 1, 页码 -

出版社

NATURE RESEARCH
DOI: 10.1038/s41598-021-86973-x

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资金

  1. Ministerio de Ciencia, Innovacion y Universidades, Gobierno de Espana (MCIU/AEI/FEDER,UE) [RTI2018-095499-B-C31]
  2. UK Engineering and Physical Sciences Research Council (EPSRC) [EP/E022936/1]
  3. [H2020-MSCA-ITN-2016 SECRET-722424]

向作者/读者索取更多资源

By using a non-Foster impedance matching circuit (NF-IMC), the paper demonstrates an effective technique to enhance both the bandwidth and radiation gain of a narrowband composite right/left-handed transmission-line (CRLH-TL) antenna, without compromising the antenna's stability. The proposed technique significantly increases the measured radiation gain and efficiency of the antenna over the operating frequency band, showing a notable improvement compared to a CRLH-TL antenna without the impedance matching circuit.
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 0.335 lambda (0)x0.137 lambda (0)x0.003 lambda (0), where lambda (0) 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 |S-11|<= -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.

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