Resonator device including U-shaped coupling support element
First Claim
1. A resonator device suitable for use in a radio frequency filter comprising:
- a helical resonator coil mounted on a circuit board and an elongate inductive coupling element mounted in a positioning device at an adjustable distance from the helical resonator coil on the circuit board and in electromagnetically-coupled relation to the helical resonator coil, the coupling element having a short-circuited end and an end for providing a signal path to the resonator device,wherein the coupling element comprises a fork-like conductive strip comprising two branches between which the helical resonator coil is located, the coupling element being selectively fixedly connected to the positioning device at one of a plurality of predetermined positions.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a coupling element (21) by which the coupling of a resonator (24) is adjusted in a radio frequency filter. The coupling element of the invention is a strip made of flexible conductor material being shaped symmetrical relative to the normal, that is, the symmetry axis of the longitudinal axis extending via the centrepoint of the strip in the longitudinal direction. The strip (21) is fixed at least at two points of an edge in the longitudinal direction to the circuit board (25) either by surface mounting on pads (33, 35, 36) or by soldering into holes borred in the circuit board to be at appropriate space from the resonator coil (34) and from the surface of the circuit board (25). One (33) of the fixing points is grounded and another (36) is connected to the signal conductor in the filter. The coupling can easily be adjusted by bending the board relative to the symmetry axis either one-sidedly or on both sides.
56 Citations
13 Claims
-
1. A resonator device suitable for use in a radio frequency filter comprising:
-
a helical resonator coil mounted on a circuit board and an elongate inductive coupling element mounted in a positioning device at an adjustable distance from the helical resonator coil on the circuit board and in electromagnetically-coupled relation to the helical resonator coil, the coupling element having a short-circuited end and an end for providing a signal path to the resonator device, wherein the coupling element comprises a fork-like conductive strip comprising two branches between which the helical resonator coil is located, the coupling element being selectively fixedly connected to the positioning device at one of a plurality of predetermined positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A resonator device which comprises:
-
a circuit board having a helical resonator coil and a coupling element positioning device in proximity to the helical resonator; and an inductive coupling element adjustably mounted in the positioning device and at an adjustable distance and in electromagnetic coupled relationship to the helical resonator coil, wherein the coupling element is selectively fixedly connected to the positioning device at one of a plurality of predetermined positions. - View Dependent Claims (12, 13)
-
Specification