Circularly Polarized Slot Antenna Array with Sequentially Rotated Feed Network for Broadband Application

摘要

This article presents a novel circularly polarized sequentially rotated slotrnantenna array (CPSSAA) designed to operate at a frequency of 5.5 GHz. This antenna isrnsuitable for communication applications such as WLAN/WiMAX. Method of feeding isrnbased on sequential rotation with seven quarter-wavelength transformers. In this case, thernelements with 200 X impedance could be replaced by other elements with different inputrnimpedance. Reducing the elements input impedance, maximum power can be transferred tornthe elements. Because the lower losses in transmission line occur in presence of lowerrnimpedance, the 3 dB axial-ratio bandwidth of the CPSSAA extends to ~1.3 GHz. ThernCPSSAA was designed to operate over the frequency range between 4.5 and 6.4 GHz correspondingrnto an impedance bandwidth of 34.86% for VSWR< 2. Acceptable agreementrnbetween the simulation and measured results validates the proposed design.