Thermal stress resistant resonator, and a method for fabricating same

• US 8,912,711 B1
• Filed: 06/22/2010
• Issued: 12/16/2014
• Est. Priority Date: 06/22/2010
• Status: Active Grant

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: Chang, David T., Hsu, Tsung-Yuan
• Primary Examiner(s): ROSENAU, DEREK JOHN
• Application Number:
  US12/820,761
• Time in Patent Office: 1,638 Days
• Field of Search: 310/320, 310/348, 310365-367
• US Class Current: 310/367
• CPC Class Codes: H01P 1/127 Strip line switches
• CPC Class Codes: H01P 7/082 Microstripline resonators H01P7/088 takes precedence
• CPC Class Codes: H03H 9/02102 of temperature influence cutting angles H03H9/02015
• CPC Class Codes: H03H 9/02377 Symmetric folded-flexure
• CPC Class Codes: H03H 9/19 consisting of quartz

Abstract

In an embodiment, a thermal stress resistant resonator is disclosed. The thermal stress resistant resonator may include or comprise a piezoelectric member having one or more non-linear piezoelectric support members extending there from.

Claims

1. A thermal stress resistant resonator comprising:

a monolithic piezoelectric member having at least two separate folded spring piezoelectric support members integrally extending therefrom, wherein the monolithic piezoelectric member and the folded spring piezoelectric support members are part of a single piece of shear mode resonating AT- or SC-cut quartz; and

wherein

each of the at least two folded spring piezoelectric support members comprises at least two arms extending generally along a first direction, connected by a third arm extending generally along a second direction perpendicular to the first direction.

2. The thermal stress resistant resonator of claim 1, wherein at least one of said one or more folded spring piezoelectric support members are generally “

J”

, “

G”

, spiral or zigzag shaped.

3. A thermal stress resistant resonator comprising:

a monolithic piezoelectric member disposed between first and second electrodes; and

a first folded spring support member including;

a first non-linear signal line extending from said first electrode; and

a first piezoelectric support member integrally extending from said monolithic piezoelectric member, said first non-linear signal line being disposed on or adjacent to said first piezoelectric support member; and

a second folded spring support member including;

a second non-linear signal line extending from said second electrode; and

a second piezoelectric support member integrally extending from said monolithic piezoelectric member separately from said first piezoelectric support member, said second non-linear signal line being disposed on or adjacent to said second piezoelectric support member;

wherein the monolithic piezoelectric member and the first and second support members comprise a single piece of shear mode resonating AT- or SC-cut quartz and wherein each of the first and second support members comprises at least two arms extending generally along a first direction, connected by a third arm extending generally along a second direction perpendicular to the first direction.

4. A thermal stress resistant resonator comprising:

a monolithic quartz member disposed between first and second electrodes; and

a first folded spring support member including;

a first non-linear signal line extending from said first electrode; and

a first quartz support member integrally extending from said monolithic quartz member, said first non-linear signal line being disposed on or adjacent to said first non-linear quartz support member;

a second non-linear signal line extending from said second electrode; and

a second quartz support member integrally extending from said monolithic quartz member separately from the first quartz support member, said second non-linear signal line being disposed on or adjacent to said second non-linear quartz support member;

wherein the monolithic quartz member and the first and second quartz support member comprise each a single piece of shear mode resonating AT- or SC-cut quartz; and

wherein each of the first and second support members comprises at least two arms extending generally along a first direction, connected by a third arm extending generally along a second direction perpendicular to the first direction.

5. The thermal stress resistant resonator of claim 4, wherein one or more of said first and second spring support members are generally “

J”

, “

G”

, spiral or zigzag shaped.

6. The thermal stress resistant resonator of claim 4, wherein each of said first and second spring support members are sized and positioned to absorb an amount of mechanical stress and isolate said quartz member from said mechanical stress.

7. The thermal stress resistant resonator of claim 4, wherein said first and

second nonlinear signal lines are sized and positioned to be coupled or soldered to bond pads of a support substrate at respective ends of said first and second non-linear quartz support members.

8. A method of fabricating a thermal stress resistant resonator, said method comprising:

providing first and second electrodes;

disposing a quartz member between said first and second electrodes; and

providing a first spring support member including;

a first non-linear signal line extending from said first electrode; and

a first non-linear quartz support member extending from said quartz member, said first non-linear signal line being disposed on or adjacent to said first non-linear quartz support member;

the method further comprising;

providing a second spring support member including;

a second non-linear signal line extending from said second electrode; and

a second non-linear quartz support member extending separately from said first non-linear quartz support member from said quartz member, said second non-linear signal line being disposed on or adjacent to said second nonlinear quartz support member;

wherein the quartz member and the first and second quartz support member form part of a single piece of shear mode resonating AT- or SC-cut quartz; and

wherein each of the first and second support members comprises at least two arms extending generally along a first direction, connected by a third arm extending generally along a second direction perpendicular to the first direction.

9. The method of claim 8, further comprising:

shaping said first and second spring support members to be generally “

J”

, “

G”

, spiral or zigzag shaped.

10. The method of claim 8, further comprising:

selecting a piezoelectric member; and

shaping said piezoelectric member to fabricate said quartz member and said first and second non-linear quartz support members.

11. The method of claim 8, further comprising:

selecting respective shapes for said first and second spring support members to configure said first and second spring support members to absorb an amount of mechanical stress and isolate said quartz member from said mechanical stress.

12. The method of claim 8, further comprising:

selecting respective shapes for said first and second non-linear signal lines to configure said first and second non-linear signal lines to be coupled or soldered to bond pads of a support substrate at respective ends of said first and second non-linear quartz support members.