Theoretical and Experimental Study of an E-band Wide Range Adjustable Attenuator
In order to meet the requirement of E-band high-precision power modulation in E-band traveling wave tube(TWT)development,E-band microwave mass spectrometry analysis,E-band semiconductor compo-nent development and other fields,a wide range high-precision adjustable attenuator operating in the frequency range of 60～90 GHz is designed.Based on the operation principle of precision rotary polarization attenuator,the size of the attenuator is simulated and optimized by HFSS.Firstly,the dimension parameters of the transform structures are optimized to ensure that the overall voltage standing wave ratio of the microwave channel is less than 1.2.Secondly,the parameters such as the shape,thickness and the surface impedance of the attenuator are optimized to ensure that the insertion loss of the attenuator is less than 1 dB,and the attenuation range is up to 60 dB.Finally,test verification of the attenuator is carried out through processing,assembling,and debugging.The experimental results show that the developed attenuator specifications are in good agreement with the design specifications,indicating that the theoretical design is feasible and it achieve the technical requirements of wide range,high-precision adjustable attenuator.
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