Wideband, Low Cross-polarization Offset Fed Parabolic Reflector Antenna Design And Research

Reflector antenna has a widely application in long distance communication system,high-resolution randar,because of its high-gain,low side lobe,high resolution characteristic.With the development of the modern military, electronic countermeasures system was given a high attention. The antenna which both have wideband and high-gain was an important part in the electronic counter measures system.Based on this system, in this paper,we launched the analysis,design and research work round a wideband off-fed parabolic reflector antenna which worked on 5-10GHz,the main research work was as follows:1. Analysis of the basic principle of the double ridged waveguide,its characteristics can be used for wideband feed,a 5-10GHz wideband double ridge horn was design by using HFSS software,than using FEKO software simulation the antenna again, the simulation results was consistent.antenna pattern was rotation symmetry,the gain was greater than 10dB,VSWR was less than 2 in the 5-10Gz band,and found the equivalents phase centre of this horn antenna based on the phase pattern.2. Studied on the physical optics algorithm,based on its formula to calculate the radiation field,self-developed software was use to calculated the radiation field of the reflector antenna,and the calculated result of self-developed software was consistent with the commercial software,but computational efficiency was greatly improved.3. Combined with the design principle of the off-fed reflector antenna and the double ridge horn which designed in this paper, a wideband,low cross-polarization off-fed reflector antenna was designed by using FEKO simulation software. The calculated result of self-developed software was consistent with the FEKO software. The gain of antenna was between 26-32dB, axial cross-polarization was lower than -50dB, antenna efficiency was about 60%.The simulation result show that the antenna was a wideband,low cross-polarization antenna.