Dielectric loaded cavity for high frequency filters
AssigneeTelecom Italia Lab S.p.A.
InventorsLuciano Accatino, Giorgio Bertin, Mauro Mongiardo
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Abstract
The dielectric loaded cavity for high frequency filters consists of a metal container housing a dielectric block held in position by supporting plates, that also sustains coupling and tuning elements. This invention provides broadband filters, small in size and with low losses. Its high symmetry structure considerably reduces the energising of spurious modes and furthermore facilitates the design using automatic calculation procedures, on the basis of accurate electromagnetic models.
Claims11
Dielectric loaded cavity for high frequency filters, consisting of:
- a metal container, divided transversally into two parts (CE, CS), mutually secured,
- a dielectric block (RS), of a high permittivity material, able to load the cavity reducing the operating frequency,
- supporting plates (SU1, SU2, SU3) to hold the dielectric block (RS) in place inside the metal container,
- coupling and tuning elements (SO, VT1, VT2, VT3) fastened to the metal container and intersected by a transverse plane (p-p), characterised in that said dielectric block (RS) includes a groove (GR) extending over the entire perimeter of the block and lying in said transverse plane (p-p) which intersects said coupling and tuning elements (SO, VT1, VT2, VT3).
Dielectric loaded cavity as in any of the previous claims, characterised in that said supporting plates (SU1, SU2, SU3) are of a plastic or ceramic low permittivity, low loss dielectric material.
Dielectric loaded cavity as in any of the previous claims, characterised in that said dielectric block (RS) is cylindrical in shape.
Dielectric loaded cavity as in any of the previous claims, characterised in that said metal container, transversally divided into two parts (CE, CS), is cylindrical in shape.
Dielectric loaded cavity as in any of the previous claims, characterised in that a first screw (VT1) is placed at 180° to a probe (SO) to tune a first resonant mode, a second screw (VT2) is placed at a right angle to the first screw to tune a second resonant mode and a third screw (VT3) is placed at 45° to the first and the second screw to couple the first and second resonant modes.
Dielectric loaded cavity as in any of the previous claims, characterised in that it is fitted with an iris (IR), in a base of the metal container, for coupling to other cavities.
Dielectric loaded cavity as in any of the previous claims, characterised in that it has an opening (AP), in the side part of the metal container, for coupling to other cavities.
Dielectric loaded cavity as in any of the previous claims, characterised in that it has a probe (SA) that is fastened to the side wall of the metal container, for coupling to other cavities.
Dependencies are inferred from the claim text.