带有扼流槽结构的共形波导缝隙阵列天线研究

设计了一款与圆柱面共形的宽边纵缝波导缝隙阵列天线,波导间采用扼流槽结构设计,抑制了表面波的影响、提高了天线增益。仿真结果表明:优化后的扼流槽结构可使共形阵列天线中间波导的互耦系数减小4.4 dB,两侧波导间的互耦系数减小3.6 dB;扼流槽结构参与了阵列天线微波辐射,提高了阵列天线的方向性;阵列天线的增益达23.3 dB,口径辐射效率达67.5%。实验结果表明,共形波导缝隙阵列天线实测增益达22.1 dB(含功分网络损耗1.1 dB),实测天线口径辐射效率达66.0%,功率容量达1.1 GW。实验结果与仿真结果基本吻合。

共形波导场近似解及缝隙天线

把矩形波导一个宽面外突成均匀曲面构成的新波导统称为共形波导．利用金属波导边界条件、变分法、边界元素法构造这种新波导中主模场的一种近似解表达式，包括曲面横截线为对称、非对称圆弧，抛物线弧，双曲线弧，椭圆弧等．然后根据等效原理，推导非对称圆弧－矩形波导曲面上窄的纵向半波长缝隙的等效谐振电导的近似计算公式，给出计算曲线．这种解虽然是近似的，但却能解决这类共形波导缝隙天线的工程设计．

A novel and simple coplanar waveguide-fed planar monopole antenna for ultra-wideband applications

In this paper, a novel and simple CPW-fed planar monopole antenna is presented for UWB application. The antenna is fabricated on inexpensive FR4 substrate and fed by 50Ω CPW on the same layer, Measured data show that the antenna provides an impedance bandwidth of about 8GHz for the return loss less than 10dB. It is also observed that the radiation pattems are nearly omni-directional over the entire frequency range. Details of the proposed antenna are presented, and simulated results are presented and discussed.