Dual Polarized Cylindrical Loop Slot Antenna for Omni Cell Application

Abstract

Urban area suffers severe multipath effects due to its complex infrastructure environment and sector antenna is a popular choice as a base station antenna in those areas. Within sector antennas, omni cell antenna is utilized as supporting antenna to cover low reception areas between them. This paper proposes a slant ±45° dual polarized omnidirectional antenna to operate as the omni cell antenna in those environments. The frequency band covers the IMT band, ranging from 1920 MHz to 2170 MHz with directivity focusing in horizontal plane. The antenna structure consists of a loop slot antenna array as excitation element which is placed inside a cylindrical slot antenna as parasitic element. Good performance is achieved in both Sparameter and directivity results, with a gain of more than 4 dBi and a gain difference of less than 1.5 dB. The measurement results also agree well with the simulation results and the final design confirms that the proposed antenna works effectively as a slant ±45° dual polarized omnidirectional antenna. key words: Cylindrical slot antenna, dual polarization, loop slot antenna, omni cell antenna, omnidirectional antenna, parasitic element. † The authors are with