Design of compact patch antenna based on zeroth-order resonator for wireless and GSM applications with dual polarization

Abstract One of the main goals to design printed circuit antennas is reducing their size for compact applications, while improving their electromagnetic properties. Using metamaterials with negative permittivity and permeability improve the antenna parameters. Our purpose is antenna miniaturization while other characteristics such as pattern, VSWR and bandwidth are maintained for wireless applications. Composite right/left-handed (CRLH) structures are typical technique to design the compact antenna. A compact and miniaturized antenna is presented in this article for wireless and GSM applications. The final antenna has directional pattern and triple-band at 1760, 2550 and 3850 MHz with gain 2.1, −3.9 and 2.5 dBi, respectively; and it is also dual polarized. The size of prototype patch antenna is 20 mm × 20 mm. In fact, the patch dimensions are reduced about 47% in comparison to conventional patch antenna at 2.5 GHz. It is designed and fabricated on FR4 low cost substrate with ɛ r  = 4.4 and thickness of 1.6 mm, and it is simulated by HFSS. Also, equivalent circuit and experimental results are presented and compared here.