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为了简化双频Wilkinson功分器的总体结构,并减小功分器的整体尺寸,在对奇模-偶模理论深入研究的基础上,利用传输线的双频阻抗变换特性,并在输入端口并联开路微带线,设计出了一个尺寸小,工作在900和2 450 MHz两个RFID频段的功分器。对功分器进行ADS仿真与实际测试,测试结果显示:当其在两个中心频率点时,传输损耗分别为3.20和3.23 dB,隔离度小于-28 dB,各个端口的回波损耗小于-30 dB,测试与仿真结果吻合良好。同时,该实测结果也显示出了功分器在两个RFID频率上具有良好的性能指标,验证了设计方案是可行的,也保证了能够很好地应用于双频RFID系统中。
In order to simplify the overall structure of the dual-frequency Wilkinson power splitter and reduce the overall size of the power divider, based on the in-depth study of the odd-mode-even mode theory, the dual-frequency impedance transformation of the transmission line is utilized and the input ports are connected in parallel Open microstrip line, designed a small size, working in the 900 and 2 450 MHz two RFID band power divider. The ADS simulation and actual test of the power splitter show that the transmission losses are 3.20 and 3.23 dB respectively at two center frequency points, the isolation is less than -28 dB, and the return loss of each port is less than -30 dB, test and simulation results agree well. At the same time, the measured results also show that the power divider has good performance index on two RFID frequencies, which verifies that the design scheme is feasible and ensures that the splitter can be well applied in the dual-frequency RFID system.