Impedance Bandwidth Improvement of a Planar Antenna Based on Metamaterial-Inspired T-Matching Network

Mohammad Alibakhshikenari*, Bal S. Virdee, Pancham Shukla, Yan Wang, Leyre Azpilicueta, Mohammad Naser-Moghadasi, Chan Hwang See, Issa Elfergani, Chemseddine Zebiri, Raed A. Abd-Alhameed, Isabelle Huynen, Jonathan Rodriguez, Tayeb A. Denidni, Francisco Falcone, Ernesto Limiti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
31 Downloads (Pure)


In this paper a metamaterial-inspired T-matching network is directly imbedded inside the feedline of a microstrip antenna to realize optimum power transfer between the front-end of an RF wireless transceiver and the antenna. The proposed T-matching network, which is composed of an arrangement of series capacitor, shunt inductor, series capacitor, exhibits left-handed metamaterial characteristics. The matching network is first theoretically modelled to gain insight of its limitations. It was then implemented directly in the 50- $\Omega $ feedline to a standard circular patch antenna, which is an unconventional methodology. The antenna's performance was verified through measurements. With the proposed technique there is 2.7 dBi improvement in the antenna's radiation gain and 12% increase in the efficiency at the center frequency, and this is achieved over a significantly wider frequency range by a factor of approximately twenty. Moreover, there is good correlation between the theoretical model, method of moments simulation, and the measurement results.

Original languageEnglish
Article number9420735
Pages (from-to)67916-67927
Number of pages12
JournalIEEE Access
Early online date3 May 2021
Publication statusPublished - 13 May 2021
Externally publishedYes


  • impedance matching
  • metamaterial
  • microstrip antenna
  • T-matching circuit
  • transmission-line


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