Search International and National Patent Collections

1. (WO2015113844) METHOD FOR COMPENSATING A TEMPERATURE DRIFT OF A MICROWAVE FILTER

Pub. No.:    WO/2015/113844    International Application No.:    PCT/EP2015/050861
Publication Date: Fri Aug 07 01:59:59 CEST 2015 International Filing Date: Tue Jan 20 00:59:59 CET 2015
IPC: H01P 1/205
H01P 1/30
Applicants: ANDREW WIRELESS SYSTEMS GMBH
Inventors: TKADLEC, Roman
HRNICKO, Frantisek
TOTH, Gabriel
Title: METHOD FOR COMPENSATING A TEMPERATURE DRIFT OF A MICROWAVE FILTER
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 (F1-F6) 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 (F1-F6) 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 (F1-F6) to adjust the temperature drifts of the resonant filter elements (F1-F6).