High Gain Low Loss Antenna Array

Antenna Gain is a key point of measuring the property of antenna array.For the given antenna Directivity,when the impedance matching of the input port are perfect,reducing the insertion loss of antenna structure can increase the Gain of antenna array to some degree.Ways to minimize the insertion loss of antenna structure are:substitute the antenna structure with low-loss material,reduce the transmission line length in the array,simplify the topological structure of the feeding network and increase the Gain of array unit.In this thesis,Fabry-Perot Resonator antenna is introduced as array unit and substrate integrated waveguide,SIW,is applied for the antenna array feeding network to cut the insertion loss of the whole antenna structure and increase antenna array Gain.Based on that method,two sets of Fabry-Perot Resonator antenna array with SIW feeding networks are designed and evaluated.Main works accomplished in this article are:1.New antenna array with high Gain is designed using high Gain Fabry-Perot Resonator antenna unit and SIW feeding networks.2.By employing artificial magnetic conductors on the antenna ground,the height of antenna array is condensed from a half wavelength to a quarter wavelength when the reflection factor phase of the artificial magnetic conductors is tuned to 0 degree.3.By applying sequentially-rotated feeding method into antenna array feeding network,the cross polarization discrimination of the circularly polarized antenna array exceeds 30dB,perfect circularly polarization purity of antenna array is displayed.4.Based on equivalent model analysis method,a broadband partially reflective surface is constructed by circular complementary frequency-selective surface.The broadband circularly polarized Fabry-Perot Resonator antenna array design has been completed by using a broadband feed source and a broadband feeding network with a relative working bandwidth of 22.6%?...