工作频率比可控的微带-缝隙双频耦合器设计

    Design of Microstrip-Slot Dual-Frequency Coupler with Controllable Frequency Ratio

    • 摘要: 针对单一工作频段的微带-缝隙耦合器,提出了一种级联两段微带-槽线传输线的微带-缝隙双频耦合器。通过槽线补偿线对耦合器奇模相速度进行补偿,使奇模相速度近似于偶模相速度,从而改善器件的工作带宽。为指导设计,将对称四端口网络奇偶模的分析拓展到微带-缝隙双频耦合器的设计中,并给出了详细的计算公式。与其他双频定向耦合器相比,该结构实现了工作频率可控的双频等分设计,且每个工作频段带宽更宽。为验证设计方法,设计了一个工作频率在2.4 GHz/5.8 GHz 的微带-缝隙双频耦合器。实测结果与仿真数据相吻合,证明了该设计方法的有效性。

       

      Abstract: In this paper, a dual-band microstrip-slot coupler cascaded two microstrip-slot transmission lines is proposed for single frequency band microstrip-slot coupler. The odd-mode phase velocity of the coupler is compensated by a slotline compensation line, which makes the odd-mode phase velocity approximate to that of the even-mode phase velocity. To guide the design, this paper extends the analysis of symmetrical four-port network odd-even mode to the design of microstripslot dual-frequency couplers, and gives the detailed calculation formula. Compared with other dual-band power dividers and directional couplers, this architecture realizes the design of dual-band equipartition with controllable working frequency, and the bandwidth of each working frequency band is wider. In order to verify the design method, a microstrip-slot dual-frequency coupler operating at 2. 4/5. 8 GHz is designed. The experimental results are in a good agreement with the simulation data, which proves the effectiveness of the design method.

       

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