Waveguide transition circuit

• US 5,198,786 A
• Filed: 12/04/1991
• Issued: 03/30/1993
• Est. Priority Date: 12/04/1991
• Status: Expired due to Fees

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Restagno, Dominic V., Russell, Mark E.
• Primary Examiner(s): GENSLER, PAUL L
• Application Number:
  US07/803,317
• Time in Patent Office: 482 Days
• Field of Search: 333/26, 333/33, 333/206, 333/243-245
• US Class Current: 333/26
• CPC Class Codes: H01P 5/103 Hollow-waveguide/coaxial-line transitions
• CPC Class Codes: H03D 2200/0017 Intermediate frequency filter
• CPC Class Codes: H03D 9/02 Demodulation using distributed inductance and capacitance, e.g. in feeder lines
• CPC Class Codes: H03D 9/0616 mounted in a hollow waveguide H03D9/0641 takes precedence
• CPC Class Codes: H03D 9/0633 mounted on a stripline circuit
• CPC Class Codes: H03D 9/0641 located in a hollow waveguide

Abstract

A transition circuit includes a conductive pin; a first dielectric member disposed about a first portion of the conductive pin; and a second dielectric member disposed about a second, different portion of the conductive pin and having a first surface disposed adjacent to a first surface of the first dielectric member. A conductive wall is disposed about and contiguous to a second surface of the first dielectric member and a second surface of the second dielectric member. A strip conductor is disposed on a third surface of said second dielectric member and coupled between said conductive pin and said conductive wall.

Claims

1. A transition circuit comprising:

a section of waveguide transmission line having an inner cavity with a conductive wall, the section of waveguide further having an end wall with a cylindrical void;

a conductive pin;

a first dielectric member disposed about a first portion of said conductive pin and extending within the cylindrical void of the end wall;

a second dielectric member disposed within the inner cavity and disposed about a second, different portion of said conductive pin and having a first surface disposed adjacent to a first surface of said first dielectric member;

and

a strip conductor disposed on a second surface of said second dielectric member and coupled between said conductive pin and said conductive wall.

2. The circuit of claim 1 wherein said first dielectric member comprises a glass cylinder.

3. The circuit of claim 2 wherein said waveguide transmission line is a rectangular waveguide transmission line.

4. The circuit of claim 2 wherein said waveguide transmission line is a circular waveguide transmission line.

5. A radio frequency circuit comprising:

a waveguide transmission line having a first port and a second port;

a conductive wall disposed across the second port of the waveguide and having an aperture therethrough;

a conductive pin having a first end and a second end;

a first dielectric member disposed about a first portion of said conductive pin and disposed in the aperture of said conductive wall;

a second dielectric member disposed about a second, different portion of said conductive pin and having a first surface disposed adjacent to a first surface of said first dielectric member; and

a strip conductor disposed on a second surface of said second dielectric member and electrically coupled between said conductive pin and said waveguide transmission line.

6. The radio frequency circuit of claim 5 wherein said second dielectric member comprises a shape substantially the same cross-sectional shape as the waveguide transmission line.

7. The radio frequency circuit of claim 6 wherein said waveguide has a rectangular cross-sectional shape.

8. The radio frequency circuit of claim 6 wherein said waveguide has a circular cross-sectional shape.

9. The radio frequency circuit of claim 6 wherein said first end of said conductive pin is coupled to a microstrip transmission line.

10. A transducer for coupling radio frequency energy comprising:

a section of waveguide having an inner cavity with a wall surface, the section of waveguide further having an end wall with a cylindrical void;

a conductive pin having a first portion longitudinally disposed within the inner cavity of the section of waveguide and a second portion extending through the cylindrical void of the end wall;

a first dielectric member extending within the cylindrical void of the end wall about a first portion of the conductive pin;

a second dielectric member disposed within the inner cavity of the section of waveguide about a second portion of the conductive pin and disposed adjacent to the first dielectric member;

a strip conductor disposed adjacent the second dielectric member and electrically connecting the conductive pin to the wall surface of the inner cavity of the section of waveguide.

11. A transducer for coupling radio frequency energy as recited in claim 10 further comprising means for coupling radio frequency energy from the conductive pin to stripline circuitry.