A Dual-Band Dual-Polarized Slot Antennas Using CCLL-Inspired Metamaterial

This paper presents a compact printed dual-band dual-polarized slot antenna. The antenna is comprised of three main sections: coupled-fed, two cells of complementary capacitively loaded loop-inspired metamaterial (CCLL-MTMs), and a slot with an overall size of 29.4×39.2 mm2. It is shown that the CCLL-MTM structure exhibits a magneto-dielectric behavior with an effective low-frequency epsilon-negative (ENG) medium. The effective ENG material leads to a miniature printed slot antenna and a low-frequency band of 1900 MHz has been achieved. At the higher frequencies, it behaves as a magnetic material, which helps to match the antenna through a broadband frequency range. An operating band of 4750 to 5730 MHz is observed. The electric field of resonating CCLL-MTM cells and the original slot are perpendiculars, thus each band supports only a single horizontal/vertical polarization. In order to validate the simulation results, a prototype of the antenna is fabricated and tested. Good agreement between the simulation and measurement results is obtained.