Q enhanced dielectric resonator circuit

• US 5,140,285 A
• Filed: 08/26/1991
• Issued: 08/18/1992
• Est. Priority Date: 08/26/1991
• Status: Expired due to Fees

• Current Assignee: AIL Systems, Inc. (ITT, Inc.)
• Original Assignee: AIL Systems, Inc. (ITT, Inc.)
• Inventors: Cohen, Leonard D.
• Primary Examiner(s): Pascal, Robert J.
• Application Number:
  US07/749,254
• Time in Patent Office: 358 Days
• Field of Search: 331/96, 331/107 R, 331/107 DP, 331/107 SL
• US Class Current: 331/96
• CPC Class Codes: H01P 1/20309 with dielectric resonator
• CPC Class Codes: H03B 2200/0022 characterised by the substrate, e.g. material
• CPC Class Codes: H03B 2200/0086 relating to the Q factor or damping of the resonant circuit
• CPC Class Codes: H03B 5/1852 the semiconductor device being a field-effect device
• CPC Class Codes: H03B 5/1864 the frequency-determining element being a dielectric resonator

Abstract

A Q enhanced dielectric resonator circuit includes a metal enclosure having interior walls defining a chamber. Secured to at least two interior walls is a dielectric substrate. Flatly mounted to at least one side of the dielectric substrate is a substrate stripline. A dielectric resonator is secured to the dielectric substrate at a selected distance from the substrate stripline. The dielectric substrate is positioned a sufficient distance from a ground plane such that the magnetic field lines of the dielectric resonator do not significantly interact with the ground plane. The dielectric resonator is also positioned such that there is substantial coupling of the magnetic field lines of the dielectric resonator with the magnetic field lines of the substrate stripline.

Claims

1. A Q enhanced dielectric resonator oscillator circuit comprising:

a metal enclosure having interior walls defining a chamber, at least one of the interior walls functioning as a ground plane;

a dielectric substrate being secured to at least two interior walls within the chamber of the metal enclosure, the dielectric substrate having a top surface and a bottom surface substantially parallel to the interior wall which functions as the ground plane, the top surface of the dielectric substrate and the proximate interior walls of the metal enclosure defining a first cavity, the bottom surface of the dielectric substrate and the proximate interior walls of the metal enclosure defining a second cavity;

at least one substrate stripline which when propagating energy generates a magnetic field defined by magnetic field lines, the substrate stripline being flatly mounted on one of the top and bottom surfaces of the dielectric substrate; and

a dielectric resonator generating a magnetic field defined by magnetic field lines, the dielectric resonator being secured to the dielectric substrate, the dielectric resonator being positioned a sufficient distance from the ground plane interior wall such that the magnetic field lines of the dielectric resonator are substantially isolated from the ground plane interior wall, the dielectric resonator also being positioned such that there is substantial coupling of the magnetic field of the dielectric resonator with the magnetic field of the substrate stripline.

2. A Q enhanced dielectric resonator circuit in accordance with claim 1 wherein the dielectric substrate has an aperture formed therethrough, the aperture passing entirely through the top surface and bottom surface of the dielectric substrate, the transverse width of the aperture being at least equal to the transverse width of the dielectric resonator, the aperture allowing the dielectric resonator to be adjusted in position within the aperture.

3. A Q enhanced dielectric resonator oscillator circuit in accordance with claim 2 wherein the Q enhanced dielectric resonator oscillator circuit has at least a first substrate stripline being mounted on the top surface of the dielectric substrate and the second substrate stripline being mounted on the bottom surface of the dielectric stripline, and wherein the first substrate stripline mounted on the top surface and the second substrate stripline mounted on the bottom surface have edges which are substantially aligned.

4. A Q enhanced dielectric resonator oscillator circuit in accordance with claim 1 wherein the dielectric resonator is mounted on one of the top surface and the bottom surface of the dielectric substrate, the dielectric resonator being positioned with respect to the substrate stripline such that the magnetic field of the dielectric resonator is substantially coupled with the magnetic field of the substrate stripline.

5. The Q enhanced dielectric resonator circuit in accordance with claim 1 which further comprises a low dielectric constant material, the low dielectric material being situated to substantially fill the first and second cavities.

6. A Q enhanced dielectric resonator circuit in accordance with claim 1 wherein each of the two interior walls to which the dielectric substrate is secured has formed therein a groove, the grooves being substantially equidistant from corresponding adjoining interior walls;

and wherein

the dielectric substrate is secured within the chamber of the metal enclosure by insertion of a portion of the dielectric substrate within the grooves of corresponding interior walls.