Patent ID: 6636131
Filing Date: 2003-10-21
Classification: H01P

Abstract:
A method for manufacturing a filter including a plurality of resonators arranged in series, comprising the steps of;determining a configuration of said resonators and a number of said resonators, so that an amount of additional coupling coefficients between said resonators except for two adjacent ones of said resonators is smaller than a predetermined value; calculating an initial coupling coefficient function with respect to a distance between two adjacent ones of said resonators, after the configuration and number of said resonators are determined; setting said initial coupling coefficient function in a coupling coefficient function; calculating coupling coefficients between said resonators for desired filter frequency responses; calculating distances between said resonators having said calculated coupling coefficients in accordance with said coupling coefficient function; designing a layout of said filter having said resonators with said calculated distances; manufacturing a tentative filter in accordance with said layout; determining whether or not filter frequency responses of said tentative filter satisfy said desired filter frequency responses; changing said coupling coefficient function when the filter frequency responses of said tentative filter do not satisfy said desired filter frequency responses, thus repeating said distance calculating step; and manufacturing actual filters in accordance with said layout when the filter frequency responses of said tentative filter satisfy said desired filter frequency responses.