Decade Bandwidth Circularly Polarized Antenna Array
Kevin Khee-Meng Chan, Adrian Eng-Choon Tan, Karumudi Rambabu
IEEE Transactions on Antennas and Propagation
Volume: 61, Issue: 11, November 2013
5435 - 5443
Circular polarized antenna array, decade bandwidth, feed network design, sequential rotation, ultra-wideband antenna
A circularly polarized antenna array design comprising of a feed network that splits an input signal into four orthogonal (0 , 90 , 180 , and 270 ) phased signals with equal magnitudes and connected to four anti-podal Vivaldi antennas sequentially rotated by 90 is presented. The proposed antenna array yields 10-dB return loss and 3-dB axial ratio bandwidths from 1–10 GHz. The symmetrical structure gives the antenna array almost identical azimuth and elevation radiation patterns. Pulse reception from various angles show equi-amplitude outputs and very little distortion. The proposed design is suited for high-resolution microwave imaging systems.
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