复合基底圆极化微带贴片天线建模与仿真

Modeling and Simulation of Composite Substrate Based Circularly Polarized Microstrip Patch Antenna

摘要:

设计了一种用于无源射频识标签,中心谐振频率为2.45GHz的圆极化微带贴片天线。设计中引入了Rogers RO4232 (tm),Rogers RO4003 (tm)以及玻璃短纤维增强聚四氟乙稀三种材质的复合基底,利用Ansoft HFSS 10.0进行建模,并对设计模块进行仿真和优化处理,仿真结果表明天线的方向性良好,有效增益为5.534dB, 带宽>50MHz(S11<-15dB),阻抗匹配良好。驻波比、辐射效率均与理论期望吻合,各项指标达到了航空配件管理及维修记录的实际需求且易于实现,价格低廉,可靠性好。

Abstract:

a novel design of patch antenna for 2.45GHz passive RFID tag is proposed. Rogers RO4232 (tm),Rogers RO4003 (tm) and short glass fiber reinforced PTFE are introduced as composite substrate. Ansoft HFSS 10.0 is employed for the building of antenna model. Simulation results match the theory-expectation. Through optimization, the system performance meets the requirements, such as good directivity, effective gain 5.534Db, bandwidth>30MHz(S₁₁<-14dB),well impedance matching. Standingwave ratio and radiation efficiency agree with the prediction. The proposed antenna model well satisfies actual application needs for aeroquip fittings and maintenance record. Meanwhile it is easily realized, cheaper and more reliable.