一种Ku频段全向高增益天线设计

提出了一种工作于Ku频段的宽频带、高增益和H面全向的新型共面波导（CPW）的中心导体和左右地板交叉连接耦合馈电天线结构设计。csTMws。软件仿真结果表明，该结构在具有较小尺寸的同时，能够有效展宽工作频带和提高增益，并保持天线的全向性。利用CSTMWS。软件对天线表面电流的仿真，解释了天线具有宽带和全向高增益辐射的原因：终端加载的三角形单极天线引起CPW中心带条的电流为行驻波电流，使天线获得了较宽的阻抗带宽；10个天线辐射单元的表面电流近似等幅同相，使天线获得了全向高增益的性能。研制出了工作在Ku频段的CPW交叉连接耦合馈电天线并进行了测试。天线印刷于厚度为0．5mm的FR-4环氧树脂板上，其反射系数低于-10dB时的频带为12．4～13．5GHz，相对带宽达8．5％，H面全向最大增益为6．6dBi，表明测试结果与仿真结果吻合较好。整个天线的尺寸仅为81mm×6．1mm，可应用于Ku频段的通信系统中。

Design of Omni-directional High-gain Antenna for Ku-band

A novel coplanar waveguide （CPW） center conductor and floors on the left and right sides cross-connected fed antenna is proposed,which has wideband and high-gain, and is H-plane omni-directional and suitable in Ku-band. After the antenna model is simulated by CST MWS , the results show that this antenna not only has compact size, but also can effectively broaden op- erating band, improve gain and remain omni-directional. The simulated results of antenna surface currents by CST MWS~ can be used to explain the reasons of antenna possessing broadband and omni-directional high-gain characteristics. The reasons are that the triangle monopole antenna loaded on the terminal makes the current on the CPW center conductor traveling wave current, so the antenna achieves a wide impedance bandwidth. The amplitude and phase of the current on the ten antenna radiation elements are approximately the same, which makes the antenna have omni- direction and high-gain characteristics. A CPW cross-connected fed antenna operating in Ku-band is designed, manufactured and tested. The prototype is printed on a FR-4 epoxy resin board with 0.5mm thickness. The experimental results indicate that the operating band is 12.4-13.5GHz with reflection coefficient less than --10dB （relative bandwidth 8.5 %）, and maximum can achieve 6.6dBi. The measured results well match the simulated tenna size is only 81mm× 6. lmm, which make it suitable to work