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Abstract
A novel microwave slot array antenna with omni-directional radiation pattern in horizontal plane is proposed. It is fed by a microstrip transmission line and uses rectangular shaped loop slots as radiators, which are etched on the metal ground and placed along the microstrip line. A proposed antenna with 8 radiators and working at the frequency of 5.75 GHz is studied. Its structural parameters were optimized by the parallel Genetic Algorithm (GA) on a cluster system. A prototype antenna was fabricated and measured. Experimental results agree well with the simulated ones and show this antenna possesses some encouraging properties. At the working frequency of 5.75 GHz, it provides a return loss of −20.5 dB, a peak gain of 11.6 dBi and gain variations within ±1.4 dB. Moreover, its radiation tilt angle can be precisely adjusted, and it exhibits good 50 Ω impedance match (−10 dB) and well-formed omni-directional patterns over a frequency band from 5.54 GHz to 5.91 GHz.