Effects of Arm Width On The Performance Of Two Arm Archimedean Spiral Antenna

Abstract

This paper presents the parametric study effects on the performance of two arm Archimedean spiral antenna. The effects of arm width were investigated in order to obtain an improved return loss, high gain, good axial ratio, high radiation efficiency and good radiation pattern throughout the frequency band of 3.1-10.6 GHz. The investigation of the parametric effects was done through simulation in CST software. Unidirectional radiation pattern is achieved when the spiral antenna is placed over a conducting ground plane. The results revealed that antenna’s performance is directly proportional with the increment of the arm width. Also the study finds out that arm width mainly affects the gain and axial ratio compared to the other antenna characteristics while arm spacing affects the return loss and gain of the antenna, as the arm spacing is increased the return loss and the gain of the antenna improved.