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1. (WO2015113845) MICROWAVE FILTER HAVING A FINE TEMPERATURE DRIFT TUNING MECHANISM

Pub. No.:    WO/2015/113845    International Application No.:    PCT/EP2015/050863
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 1/208
H01P 1/30
H01Q 3/20
Applicants: ANDREW WIRELESS SYSTEMS GMBH
Inventors: TKADLEC, Roman
HRNICKO, Frantisek
TOTH, Gabriel
Title: MICROWAVE FILTER HAVING A FINE TEMPERATURE DRIFT TUNING MECHANISM
Abstract:
Microwave filter having a temperature drift tuning mechanism A microwave filter (1) comprises at least one resonant filter element (F, F1-F6) resonating at a resonant frequency (F0) and having a housing (11), a resonant filter cavity (C, C1-C6) arranged in the housing (11) and a resonator element (12) arranged in the housing. At least two tuning elements (13, 14) are arranged on the housing (11) of the resonant filter element (F, F1-F6) and each extend into the cavity (C, C1-C6) with a shaft portion (132, 142), wherein the two tuning elements (13, 14) are movable with respect to the housing (11) to adjust the length (L1, L2) of the shaft portion (132, 142) extending into the housing (11) and wherein the at least two tuning elements (13, 14) are constituted and designed such that by adjusting the length (L1, L2) of the shaft portion (132, 142) of each tuning element (13, 14) extending into the housing (11) a temperature drift of the resonant frequency (F0) is adjustable.