Patent ID: 6504446
Filing Date: 2003-01-07
Classification: H01P

Abstract:
A method for adjusting the characteristics of a dielectric filter of the type which includes first and second resonators formed, at least in part, by a conductive film located on a dielectric material, the first and second resonators cooperating with one another to form a band pass filter having a central band pass, the degree of coupling between the first and second resonators being indicated by a coupling coefficient, wherein the dielectric filter is a first dielectric filter, the method comprising:determining the values of the central frequency and coupling characteristic; determining the amount that the conductive film and dielectric material should be trimmed to change the central frequency and coupling characteristic to target values as a function of both the determined values and stored data representing the relationship between amounts of the conductive film and dielectric material which are trimmed and the resulting changes in the values in the central frequency and coupling coefficient; and trimming the conductive film and dielectric material as a function of the so determined amount; testing a standard dielectric filter having the same nominal structure as the first dielectric filter to obtain data indicating the relationship between amounts of the conductive film and dielectric material of the standard dielectric filter which are trimmed and the resulting changes in the values in the central frequency and coupling coefficient of the standard dielectric filter; and storing the so obtained data as the stored data.