TUNABLE FILTER, COMBINER AND METHODS OF CHARACTERIZING AND TUNING SAID FILTER

摘要

A method for characterizing a frequency response of a tunable filter (11) includes the steps of adjusting a tuning means (12) to a first predetermined position; measuring the resonance frequency of the filter (10); temporary storing the measured resonance frequency and the position; and repeating these steps for a number of different predetermined positions of the tuning means. A mathematical function representing tuning means position as a function of resonance frequency is then determined, whereby several advantages are achieved. Little memory is required and the function provides for rapid and accurate tuning of the filter. The invention is also directed to a tunable filter, a combiner and a method for tuning a filter.