Abstract: 
A method for compensating a temperature drift of a microwave filter (1) comprises the following steps: measuring a first frequency response of a microwave filter (1) comprising multiple resonant filter elements (F1F6) at a first temperature to obtain a first measured frequency response; determining values of elements (Y1, Y2, Y3) of an equivalent circuit (E) corresponding to the microwave filter (1) such that a first modelled frequency response computed using the equivalent circuit (E) matches the first measured frequency response to obtain a first model modelling the microwave filter (1) at the first temperature: measuring a second frequency response of the microwave filter (1) at a second temperature to obtain a second measured frequency response; determining values of elements (Y1, Y2, Y3) of the equivalent circuit (E) corresponding to the microwave filter (1) anew such that a second modelled frequency response computed using the equivalent circuit (E) matches the second measured frequency response to obtain a second model modelling the microwave filter (1) at the second temperature; determining a temperature drift of a resonant frequency for each of the multiple resonant filter elements (F1F6) using the first model and the second model; and adjusting an overall temperature drift of the microwave filter (1) by using tuning mechanisms (13, 14) on at least some of the multiple resonant filter elements (F1F6) to adjust the temperature drifts of the resonant filter elements (F1F6).
