有源集成背馈式接收天线设计

为了提高接收天线系统的增益以及灵敏度,对于天线与射频前端组成的接收系统采用了一种有源集成接收天线的设计方案,从而省略了传统设计中的有源电路与微带天线之间的匹配网络.依照此方案,设计并实现了一个背馈结构的矩形微带天线与前级低噪声放大器电路的有源集成.矩形微带天线的馈电点与低噪声放大器的输入端通过金属探针相连,当天线在2.48?GHz谐振时,通过选择合适的馈电点位置,天线产生放大器设计所需的输入阻抗.有源集成背馈式接收天线工作于S波段,最终的测试结果显示了其优良的特性.

Design of active integrated probe-fed receiving antenna

In order to improve the gain and sensitivity of the receiving antenna system, one scheme on how to design active integrated receiving antenna was adopted in the receiving antenna and radio frequency front end system, which can bypass the traditional impedance matching network between the active circuit and the microstrip antenna. Depending on this scheme, the design of active integration between the rectangle microstrip probe-fed antenna and the front end low noise amplifier was performed. The feed of the rectangle microstrip antenna was connected with the input port of the low noise amplifier by one metal probe. When the antenna is resonant at 2.48?GHz, by selecting the proper feed position, the antenna can produce the input impendence needed by the low noise amplifier design. The active integrated probe-fed receiving antenna operates on the S band. The final measurement results show good characteristic.