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A new method for hybrid diagnosis and tuning of coaxial cavity filter

Shengbiao Wu  Can Liu  Weihua Cao  Min Wu  
【摘要】:This paper presents a hybrid diagnosis and tuning method of coaxial cavity filter based on experience and data.The method is based on the experience of skilled staff at the initial stage of tuning,and put the bandpass and echo curve of the filter to the frequency range.In the second stages of the tuning,the phase shift is removed,which is caused by the transmission line and the higher order mode at first,then the loss factor of the filter is processed.Secondly,we use the improved Cauchy method and filter synthesis knowledge to realize the coupling matrix extraction.Finally,the implicit space mapping algorithm is used to establish the mapping relationship between the coupling matrix variation and the screw variation,in order to guide the tuning amplitude and direction by the coupling matrix.Experiments show that this method has better effects on saving tuning time and reducing tuning difficulties,and it has certain popularization value for the batch production of the filter.

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