Compact coplanar waveguide (CPW)-fed resonant antennas for dual-frequency operation using epsilon negative transmission line

This paper presents the design and analysis of compact coplanar waveguide (CPW)-fed dual-frequency resonant antenna. It can be analyzed and designed on the concept of the epsilon negative (ENG) meta-structured transmission line (MTL) and on a CPW single layer where vias are not required. The resonant phenomenon is employed to reduce the antenna size. To design and analyze the proposed antenna, the circuit simulation of the ENG MTL unit resonator is executed by the equivalent circuit and the results are compared with those of full wave simulation and experiment. The results show that the presented antenna has such a reasonable radiation characteristics of bandwidth and size which are verified by commercial EM simulation software HFSS11 and is suitable for compact dual-frequency antenna. Then the antenna is fabricated and measured. The realized antenna has a compact size of 22 mm×26.6 mm . Experimental results show that the proposed antenna can operate at 2.5 (2.485 to 2.515) GHz and 4.20 (4.075 to 4.327)GHz bands. Good agreement between the simulated and measured results is obtained.