Wideband High-Gain Circularly Polarized Planar Antenna Array for L Band Radar

摘要

This paper presents a simple compact circular polarization passive patch antenna array with low profile and good axial ratio, which operate for the L-band frequency of 1.35 GHz. The array contains 16 truncated rectangular patch antenna elements and these elements are aligned to form a 4×4 array in which each antenna element is fed by independent coaxial feed. Proposed design reduces the effect of the complex feeding network on axial ratio. The size of antenna array is reduced significantly by placing each antenna array element at a distance of around half of free space wavelength. Bigger antenna array with more elements can be formed by combining this antenna element and make the miniaturization of the array more obvious.