一种Ka波段高功率微带隔离器设计

Design of a kind of Ka-band high power microstrip isolator

设计了一种工作在Ka波段、带宽为4 GHz、功率容量为2 W的微带隔离器。此隔离器要求的工作频带宽,外形尺寸小,功率容量大。通过对微带隔离器工作模式分析,对环行器部分和负载部分进行设计,采用双Y结环行器电路设计和蛇形开路负载设计,以达到增大带宽和提高功率容量的目的。建立初步仿真模型,并通过HFSS软件进行全波仿真优化,最终设计的隔离器性能为:电压驻波比≤1.45,正向损耗≤1.2 dB,反向损耗≥15 dB,承受功率2 W,外形尺寸为5 mm×5 mm×4 mm,满足通信系统应用要求。

A Ka-band microstrip isolator with bandwidth of 4 GHz and power capacity of 2 W is designed.The isolator requires wide operating frequency band,small size and high power capacity.By analyzing the working mode of the isolator,the circulator part and the load part are designed,and the double Y-junction circulator circuit design and the serpentine open-circuit load design are used to achieve the purpose of increasing both the bandwidth and power capacity.The primary simulating model is established and the full-wave simulation and optimization is carried out by HFSS software.The designed isolator features a voltage standing wave ratio≤1.45,forward loss≤1.2 dB,reverse isolation≥15 dB,withstand power 2 W,and dimension of 5 mm×5 mm×4 mm,which meets the requirements of the communication system.