Dielectric resonator having plural frequency-adjusting discs

• US 5,677,654 A
• Filed: 06/04/1996
• Issued: 10/14/1997
• Est. Priority Date: 10/05/1994
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Sarkka, Veli-Matti
• Primary Examiner(s): Lee, Benny
• Assistant Examiner(s): Summons, Barbara
• Application Number:
  US08/640,800
• Time in Patent Office: 497 Days
• Field of Search: 333/219.1, 333/231, 333/232, 333/233, 333/235
• US Class Current: 333/235
• CPC Class Codes: H01P 7/10 Dielectric resonators

Abstract

A dielectric resonator including a dielectric cylindrical resonator disc, and a resonance frequency controller. The frequency controller includes a dielectric cylindrical adjustment disc provided on the resonator disc so that the adjustment disc is movable in the radial direction for controlling the resonance frequency of the resonator. The frequency controller further includes a dielectric fine adjustment disc, provided on the adjustment disc so that the fine adjustment disc is movable by a movement of an adjustment mechanism with respect to the adjustment disc for fine adjustment of the resonance frequency. Thus, the frequency controller has two slopes of adjustment, whereby the adjustment is fast due to the movement of both adjustment discs, and also extremely accurate due to the fine adjustment function, which is achieved when the thinner adjustment disc alone is moved.

Claims

1. A dielectric resonator comprising:

a dielectric cylindrical resonator disc,

a frequency controller, comprising an adjustment mechanism and a dielectric cylindrical adjustment disc one of two opposite planar surfaces of the adjustment disc being arranged against a planar surface of the resonator disc so that the adjustment disc is movable by means of the adjustment mechanism in the radial direction with respect to the resonator disc for adjusting the resonance frequency of the resonator, and

an electrically conductive casing,

the frequency controller further comprising a dielectric fine adjustment disc, one planar surface of which is set against the other one of said two planar surfaces of the adjustment disc so that the fine adjustment disc is movable by a movement of the adjustment mechanism with respect to the adjustment disc for fine adjustment of the resonance frequency provided by said dielectric resonator.

2. The resonator as claimed in claim 1, wherein:

said resonator disc is thicker than said adjustment disc and said fine adjustment disc, and

said resonator disc is supported in a fixed position.

3. The resonator as claimed in claim 1, wherein:

said adjustment disc is thicker than said fine adjustment disc.

4. The resonator as claimed in claim 1, wherein:

said adjustment disc and said fine adjustment disc are provided with engagement means, which allow, due to the effect of said adjustment mechanism, a predetermined radial movement of said fine adjustment disc along said other one of said planar surfaces of said adjustment disc before causing engagement between said fine adjustment disc and said adjustment disc, said engagement enabling movement of said adjustment mechanism also to move said adjustment disc radially along said planar surface of said resonator disc.

5. The resonator as claimed in claim 4, wherein:

said fine adjustment disc comprises a radial elongated hole having two horizontally opposite ends, and on said other one of said two planar surfaces of said adjustment disc there is provided a projection, pin, which extends into said hole of said fine adjustment disc, said pin and said hole being dimensioned so that a predetermined radial movement of said fine adjustment disc on top of said adjustment disc is allowed before said pin in said hole of said fine adjustment disc engages with a respective one of said ends of said hole of said fine adjustment disc, and transfers movement of said adjustment mechanism also to move said adjustment disc.

6. The resonator as claimed in claim 1, wherein:

said adjustment disc and said fine adjustment disc are sized and shaped such that during common movement of said adjustment disc and said fine adjustment disc, said resonance frequency adjustment has a first slope of adjustment, and that upon said fine adjustment disc moving alone, said resonance frequency adjustment has a second slope of adjustment, which is remarkably lower as compared with said first slope of resonance frequency adjustment.

7. The resonator as claimed in claim 1, wherein:

said adjustment mechanism comprises a control rod connected with said fine adjustment disc.