Broadband Circularly Polarized Helical Array Antenna Design for Ground to Air Data Link

摘要

This paper presents design of broadband 4 element circularly polarised helical antenna array in L-band to achieve asymmetric beam coverage in two planes. The 4x1 corporate feed network is designed using Wilkinson power divider to feed four helical antennas in equal amplitude and phase to achieve beam coverage in end-fire direction. The antenna array is covered with fiber glass radome to protect from environment. 4x1 helical antenna array is fabricated and its performance is measured. The 4 element array achieves maximum gain of 14.7 dBic at and half power beam width of 19 degree in azimuth plane and 47 degree in elevation plane at center frequency.