نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی خواجه نصیر
2 پژوهشگاه فضایی ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
Bandwidth of patch antennas has always been a challenge for designers. One of the simplest methods of increasing its bandwidth and gain is to use a thicker patch antenna substrate. Using this method in a truncated circular polarized patch antenna causes a frequency shift between impedance bandwidth and axial ratio bandwidth. In this paper, we were able to compensate this frequency shift by transforming the square truncated patch antenna into a rectangle truncated patch antenna. Using analytical analysis, the factor the main cause of this frequency shift is shown and then its effect compensated. The performance of the proposed method is successfully verfied by applying it to a truncated patch antenna in UHF frequency band designed with air and FR4 substrate. Before applying this method, the total antenna bandwidth namely the common band between the impedance and the axial ratio bandwidth of the antenna is less than 1% while by applying the proposed method, the bandwidth of the antenna is enhanced by about 5%. The manufacture antenna’s measurement results are in good agreement with the simulation results.
کلیدواژهها [English]