一种新型宽带方向图可重构天线

A Novel Broadband Antenna with Pattern Reconfigurability

设计了一种具有两个辐射模式的宽带方向图可重构天线。该天线由两个准八木天线单元组成，两个单元的辐射体分别指向相反的方向。两个单元使用同一根同轴线从背面馈电，在每个单元的馈线与同轴线馈点之间安装一个PIN二极管以控制辐射模式。在天线振子的下方安装反射板用以调节天线的辐射方向，避免了天线对射频组件的干扰。仿真结果显示，天线的工作频段为5．00～5．65GHz，两种模式的主瓣分别指向θ=±55°，3dB波瓣宽度均为110°，工作频段内增益为7.3～7．7dB，

A novel wideband antenna with two reconfigurable radiating patterns is presented. The proposed antenna is made of two quasi-Yagi antennas, with their radiations directing to opposite directions, respectively. The two elements are fed with one coaxial cable from the back of the dielectric substrate. A PIN diode is embedded between the feeding line of each element and coaxial cable to regulate the radiating pattern. Besides, reflectors are set under the arms of the driver dipole to regulate the radiating direction and avoid interference with radio components. Simulated results show that the proposed antenna can work at 5.00 GHz to 5.65 GHz, the main beams of the two modes direct toθ=±55° respectively, and the 3dB beam-widths of main beams are all 110°. The gain within the operating bandwidth is 7.3 dB to 7.7 dB. The main beam direction of the proposed antenna can be regulated by the size of reflectors. The antenna was fabricated and measured. The measurement results are good with the simulation results. The antenna presented can be used in intelligent communication systems.