构架式可展天线电性能研究

Electro-magnetic Performance Research on Tetrahedron Truss Antenna

提出了一种构架单元式的展开桁架天线,对构架式可展天线的电性能进行了研究,以确定较优的设计参数和结构方案,针对可展反射面形态的具体特点,基于几何光学原理,推导了可展天线远场的电场强度公式,将口径面划分成矩形网格,用数值方法对远场场强进行积分,得到天线反射面的方向图.进而编制相应程序,用于分析不同设计参数的构架式天线反射面的电性能.该方法直接将结构变形与天线电性能相联系,避免了通过均方根换算带来的额外误差,使得设计更准确.此方法同样适用于标准抛物面或者任何已知缺陷反射面的辐射场计算.

Large deployable truss antennas have extensive applications in communication satellites and space stations. This paper deals with a kind of deployable truss antenna that consists of tetrahedral niodules. Electro-magnetic performance of tetrahedron truss deployable antenna is researched, to optinfize design parameter and structure precept. According to the features of the deployable reflector configuration and the geometry optical theory, the computing arithmetic of the electro-field intensity of the tetrahedron truss antenna is formulized. Then the paraboloid reflector is separated to form rectangular grid on the aperture plane and the integral of the far-field is conducted with the analytical method. Finally far-field pattern of antenna reflector is obtained. The corresponding program is designed and used to analyze far-field pattern of truss antenna with different design parameter. This method directly related the structure with the electro-magnetic field, which improves the design by leaving out the RMS value. So the design process is more accurate. This program can be applied to analyze the reflector radiation field of standard reflector or any reflector which distortion is already described.