Helical resonator filter including short circuit stub tuning

Details Helical resonator filter including short circuit stub tuning Helical resonator filter including short circuit stub tuning

1994-12-23

1996-12-17

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, 333235, 333206, H01P 120

Patent

active

055857710

ABSTRACT:
The present invention relates to a radio frequency filter the resonators (6,7) of which are made up of a wire wound into a cylindrical coil comprising a number of turns and of a surrounding casing (41). Finger-like projections (3) of an insulating plate (1) support the conical coils from the inside, and the coupling to the resonator is from a microstrip line (8), at a tap point (21), on the insulating plate. Each cylindrical coil has, adjoining the first turn, a straight portion (2) which is parallel to the axis of the cylindrical coil and extends towards the bottom plate (44) of the filter. On the inside surface of the bottom plate (44) there is a lead (51) one end (E) of which is short-circuited and the other end open, and the tip (12) of the straight portion (2) adjoining the cylindrical coil (6) is in contact with this lead (51). In this case, in spite of any rotation of the cylindrical coil relative to its own axis at the assembling stage of the filter, the distance of the tap point from the short-circuited end (E) of the lead (51) will remain unchanged, in which case the tap impedance will not change. The lead (51) is preferably a microstrip line on the surface of the insulating plate.

REFERENCES:
patent: 4342969 (1982-08-01), Myers et al.
patent: 4682131 (1987-07-01), May
patent: 4977383 (1990-12-01), Niiranen
patent: 5047739 (1991-09-01), Kuokkanen
patent: 5432489 (1995-07-01), Yrojola 333202

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