一种宽带水平全向平面天线设计

为提高水平全向天线的带宽，设计了一种宽带水平全向平面天线。该天线由4只弧形偶极子天线组阵构成一个圆环,每只偶极子天线振子交错印刷在印制板的上下表面。将4只弧形偶极子远场方向图叠加组合为水平全向辐射方向图；在每只偶极子振子上开缝并在印制板边缘加载寄生贴片，增加天线的带宽。设计和加工制作一只天线样品，测试结果表明，该天线能够在2~3.71 GHz实现|S11|<10 dB，相对带宽达到60%，水平全向平均增益约为1.36 dBi，不圆度小于±1.5 dB，测试与仿真结果吻合良好。

Design of a horizontally omnidirectional wide-band antenna

In order to increase the bandwidth of the horizontal omnidirectional antenna, a new type of wide-band horizontal polarization omnidirectional antenna is designed. The antenna consists of an array of four arc-shaped dipole antennas forming a ring, and each dipole antenna is printed on the upper and lower surfaces of the Printed Circuit Board(PCB). The radiation fields of the four arc-shaped dipole antennas add together and compose a horizontal omnidirectional pattern in the far field. By slitting each dipole element and loading parasitic patches on the edge of the printed board, the bandwidth of the antenna is increased. An antenna sample is designed and manufactured. The measured results show that the antenna can achieve |S11|<10 dB in 2-3.71 GHz, the relative bandwidth is 60%, the mean gain of its horizontal omnidirectional is about 1.36 dBi, and the non-roundness of its horizontal omnidirectional pattern is less than ±1.5 dB. The test results are in good agreement with the simulation results.