Three Optimized Omnidirectional Microstrip Antennas (Oma) for Wlan Applications

Abstract

Abstract-In this paper, three omnidirectional microstrip array antennas are optimized, fabricated and measured. The proposed planar antennas are composed from series of microstrip line sections with inverted top and bottom conductors at each section. The antenna design parameters are optimized to design three different antennas: wide bandwidth, high-gain and dual-band antennas. In the wideband antenna, a good impedance matching is obtained for relative bandwidth of 31% that covers the frequency range of WLAN. The dual-band omnidirectional antenna operates at 2.45 GHz and 5.25 GHz with gains of 6.69 dBi and 7.71 dBi, respectively. Also, the optimized high-gain antenna achieves 9.3 dBi gain. The three optimized antennas are fabricated and tested. The measurement results show a very good agreement with the simulation ones. The optimization results verify the ability and capability of the antenna to achieve the desired specifications.

An Omnidirectional Printed Collinear Microstrip Antenna Array

“…The coaxial collinear antenna, introduced by Judasz and Balsley firstly [1], and it has been widely used due to its compact, simple and cheap structure. Several researches further implemented this principle in either coaxial or microstrip antenna technology [2][3][4][5][6][7][8][9][10][11]. In applications where the sidelobe level and bandwidth of omnidirectional pattern are critical, some collinear arrays have been presented [12].…”