Passive EMI dissipation apparatus and method

• US 5,814,761 A
• Filed: 09/07/1995
• Issued: 09/29/1998
• Est. Priority Date: 09/07/1995
• Status: Expired due to Term

• Current Assignee: Shakti Audio Innovations Co.
• Original Assignee: Shakti Audio Innovations Co.
• Inventors: Piazza, Benjamin J.
• Primary Examiner(s): Ledynh, Bot L.
• Assistant Examiner(s): Ngo, Hung V.
• Application Number:
  US08/525,941
• Time in Patent Office: 1,118 Days
• Field of Search: 174/35 R, 174/35 MS, 361/816, 361/818, 336/84 M, 330/68, 330/170, 313/313, 313/356
• US Class Current: 174/377
• CPC Class Codes: H05K 9/0075 Magnetic shielding materials

Abstract

A passive Electromagnetic Interference (EMI) dissipation apparatus typically utilized with an active host component to reduce self-generated and externally-generated electromagnetic interference and to improve the performance of the host component is disclosed. The apparatus includes a housing and a circuit located within the housing. The circuit includes a plurality of pyramidal-shaped resonating chambers having internally conductive surfaces covered with a layer of electrically resistive material, a plurality of quartz resonators each mounted upon a damping compound, and a plurality of permanent magnets each including a magnetically permeable bar. The electromagnetic interference is dissipated in the circuit over a broad range of frequencies in the form of heat. In a preferred embodiment, the plurality of permanent magnets and the corresponding plurality of permeable bars are mounted within a common chamber located immediately below the base of each of the pyramidal-shaped resonating chambers. Each of the quartz resonators is placed upon a separate portion of viso-elastic damping compound arranged upon one of a pair of non-conductive plates. The pair of plates are then manipulated so as to sandwich the pyramidal-shaped resonating chambers and the permanent magnets and corresponding permeable bars. The sandwiched combination forms the circuit which dissipates the electromagnetic interference and is then positioned and sealed within the non-conductive housing.

Claims

1. A Passive apparatus for dissipating electromagnetic interference comprising:

a housing flexibly placed external to a host component;

a passive circuit located within said housing for passively absorbing and dissipating radiated electromagnetic interference over a broad range of frequencies, said passive circuit comprising a plurality of non-uniform, irregularly-shaped quartz resonators each mounted upon a rubberized viso-elastic damping compound, said electromagnetic interference being dissipated as heat within said passive circuit.

2. The apparatus of claim 1 wherein said housing is comprised of a poured stone concrete material.

3. The apparatus of claim 1 wherein said passive circuit for dissipating radiated electromagnetic interference further includes a plurality of pyramid-shaped resonating chambers positioned over a common chamber.

4. The apparatus of claim 1 wherein said quartz resonators passively dissipate radiated electromagnetic interference within the range of frequencies of from 500 Kilohertz to 50 Megahertz.

5. The apparatus of claim 3 wherein said resonating chambers have internally conductive surfaces covered with a layer of electrically resistive material.

6. The apparatus of claim 3 wherein said resonating chambers dissipate electromagnetic interference within the range of frequencies of from 1.5 GigaHertz to 100 GigaHertz.

7. The apparatus of claim 1 wherein said passive circuit for dissipating radiated electromagnetic interference further includes a plurality of permanent magnets mounted within a common chamber beneath a plurality of pyramid-shaped resonating chambers.

8. The apparatus of claim 7 wherein each of said permanent magnets being in physical communication with a magnetically permeable bar for extending the magnetic field of said permanent magnets.

9. The apparatus of claim 7 wherein said permanent magnets dissipate radiated electromagnetic interference within the range of frequencies of from 50 Hertz to 200 KiloHertz.

10. A passive apparatus for dissipating electromagnetic interference comprising:

a housing flexibly placed external to a host component;

a passive circuit located within said housing for passively absorbing and dissipating radiated electromagnetic interference, said passive circuit comprising

(a) a plurality of pyramid-shaped resonating chambers positioned over a common chamber, said resonating chambers having internally conductive surfaces covered with a layer of electrically resistive material,

(b) a plurality of irregularly-shaped quartz resonators each mounted upon a rubberized viso-elastic damping compound, and

(c) a plurality of permanent magnets each in physical communication with a magnetically permeable bar mounted in said common chamber, said electromagnetic interference being dissipated as heat within said passive circuit over a broad range of frequencies.

11. The apparatus of claim 10 wherein said rubberized viso-elastic damping compound damps the oscillations of said quartz resonators for lowering the efficiency of energy conversion in said quartz resonators.

12. A passive apparatus for dissipating electromagnetic interference comprising:

a housing flexibly placed external to a host component;

a passive circuit located within said housing for passively absorbing and dissipating radiated electromagnetic interference over a broad range of frequencies, said passive circuit comprising a plurality of pyramid-shaped resonating chambers positioned over a common chamber, a plurality of quartz resonators each mounted upon a rubberized viso-elastic damping compound, and a plurality of permanent magnets each in physical communication with a magnetically permeable bar, said electromagnetic interference being dissipated as heat within said passive circuit.