摘要：The purpose of this work is to design and analyze an s-shaped printed circuit board (PCB) monopole antenna. The antenna was analyzed to operate at a resonance frequency band of 868 MHz;acceptable in 915 MHz as well. The s-shape is selected due to the need of reducing the overall size of the normal monopole antenna. The printed antenna was designed with an approximate overall size of 39 × 56 mm2 of which the antenna’s upper side is 26 × 39 mm2 while its reference ground board was sized at 39 × 30 mm2. The antenna is fed by a strip line of 3 × 1.5 mm2, in series with a 4.4 pF capacitance and shunt with an 8.7 nH inductance for purpose of antenna’s impedance matching with the input. A couple of existing publications showed that PCB antenna is not a new technology;however not an old technology for telecommunication industry. The raised problem by this work was duly solved with HFSS as a tool;excellent results are presented. After duly matching the antenna’s impedance with 50 Ω microstrip feed-line, solutions for overall performance were analyzed and demonstrated optimal: radiation patterns were proven omnidirectional, antenna gain optimized. The present antenna prototype’s overall dimensions can be readjusted according to any industrial and manufacturing requests.

摘要：为解决采用315 MHz或433 MHz频段无线接收模块的系统,干扰源多,接收灵敏度低,设计调试复杂等问题,提出了一种868 MHz无线接收模块的设计方案。方案中采用英飞凌低功耗单芯片FSK/ASK超外差无线接收器TDA5210,以及少量的外围分立器件。通过改善接收模块PCB中铜箔天线走向,提高接收灵敏度;在接收模块的电源和地的输入端串入磁珠,以减少来自应用系统中晶振等高频器件的噪声干扰。实验结果表明,基于TDA5210的无线接收模块,设计调试简单,干扰源少,抑制噪声能力强,接收灵敏度高,工作稳定。