High efficiency and dual polarized array antenna for satellite-communication application

摘要

In this paper, we describe a flat plate array for the satellite communication receiver,with small aperture, high efficiency and low cross polarization levels.The radiating element used is circular waveguide which is probe-fed using a stripline distribution networks providing uniform excitations to the 4×4 array. The networks are placed one behind the other for dual polarized purposes. The array is composed of 2×1 subarrays. The overall array thickness is about 1λ (λ is the wavelength of the center frequency), and the array aperture is about 3.2λ.Simulated results on a Ku-band prototype are discussed. The bandwidth (VSWR below 2.0)is about 500MHz, cross-polarized radiation from both ports is below -35dB, the isolation between the ports is below -25dB, and the gain of the 4×4 array is about 20dBi. Simulated efficiency is about 75%(including the stripline feed networks).