Compact Metamaterial-Based Tunable Zeroth-Order Resonant Antenna with Chip Variable Capacitor

Youn-Kwon Jung, Bomson Lee
2013 Journal of the Korean Institute of Electromagnetic Engineering and Science  
This letter presents a compact metamaterial-based tunable zeroth-order resonant antenna. It is based on the double-negative unit cell with a function of tunable inductance realized by a varactor and impedance convertor in the shunt branch. The resonant frequency of the designed antenna ranges from 2.31 to 3.08 GHz, depending on the capacitance of the used varactor. Its size is very compact (0.05 λ 0 ×0.2 λ 0 ) with a relatively wide tunable range of 29.1%. The impedance bandwidth of the antenna
more » ... idth of the antenna is from 20 to 50 MHz for the resonant center frequency. The measured maximum total realized gain is from -0.68 dBi (2.43 GHz) to 1.69 dBi (2.97 GHz). The EM-simulated and measured results are in good agreement. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
doi:10.5515/jkiees.2013.13.3.189 fatcat:enoyhcnpe5e6nptd5lizbuqmje