Director effect on performance of faulty microstrip rectangular patch array antenna

This paper was prepared to be acquainted with the effect of parasitic elements on the faulty antenna performance with respect to the performance of healthy antenna without directors. This work interested in two models of microstip antennas, the first consists of four elements without directors and the second is an antenna with three directors as parasitic elements. The antenna was designed and simulated using HFSS to be suitable for the antenna parameters determination such as maximum radiation intensity, directivity, gain, radiation pattern, and return loss. Monitoring and analysis of the results was done comparatively between the two models, where the two models of antennas are working in normal conditions (healthy case) and faulty conditions as a discontinuity in the feeding line (On/Off fault) for one, two and three elements. The comparative study focuses on maximum radiation intensity, directivity, and gain values where model (1) gives ranges of 0.29 to 0.08 for maximum radiation intensity, 4.40 to 1.86 for directivity, 4.02 to 1.67 for gain; while model (2) gives ranges of 0.33 to 0.09 for maximum radiation intensity, 5.01 to 2.09 for directivity, 4.59 to 1.89 for gain. The results indicated that the presents of parasitic elements is beneficial for the performance of microstrip array antenna even it works in faulty conditions.