A Dual-Band Dual-Polarized Slot Antennas Using CCLLInspired Metamaterial

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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 lowfrequency 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 CCLLMTM 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.