Microwave components

• US 4,200,870 A
• Filed: 10/10/1978
• Issued: 04/29/1980
• Est. Priority Date: 10/10/1978
• Status: Expired due to Term

• Current Assignee: Bridgend Processes Limited
• Original Assignee: Bridgend Processes Limited
• Inventors: Gabbitas, Colin
• Primary Examiner(s): Tubbesing, T. H.
• Application Number:
  US05/950,163
• Time in Patent Office: 567 Days
• Field of Search: 343/5 PD, 343/8, 343/12 A, 343/786
• US Class Current: 342/175
• CPC Class Codes: G01S 7/032 Constructional details for solid-state radar subsystems

Abstract

A microwave transmitter/receiver unit consisting of a hollow waveguide member closed at one end and open at the other is divided longitudinally by an internal dividing plate into two waveguides, one for transmitting microwave radiation to the open end and the other for receiving such radiation from the open end. A Gunn diode is mounted in a cavity in the transmitting waveguide and at least one detector diode is mounted in the receiving waveguide. The unit is of an inherently compact nature and has particular application to doppler radars, two way communication links and distance measuring radars.

Claims

1. A microwave transmitting and receiving device, comprising

(a) an elongated hollow waveguide shell member open at one end and containing a chamber, said shell member having in vertical transverse cross section a rectangular configuration including opposed pairs of major and minor walls, respectively;

(b) planar plate means arranged within said chamber between, parallel with, and spaced from said major walls, said plate means bisecting said chamber to define a pair of waveguides having the same dimensions, respectively;

(c) microwave oscillator diode means arranged within one of said waveguides for transmitting radiation to said open end;

(d) microwave detector diode means arranged within the other of said waveguides for receiving radiation from said open end; and

(e) means for mounting said diode means within said pair of waveguides, respectively, said mounting means being connected with said plate means and said opposed major wall of said shell member, respectively, whereby radiation from said oscillator diode means is transmitted from said transmitting waveguide to said open end, and radiation is received by said detector diode means via said receiving waveguide.

2. Apparatus as defined in claim 1, wherein said plate means contains an aperture for transmitting microwave radiation from said transmitting waveguide to said receiving waveguide for heterodyning the device.

3. Apparatus as defined in claim 2, and further comprising post means connected with said shell member and extending transversely through said plate aperture.

4. Apparatus as defined in claim 3, wherein said post means is threadably connected with said shell member for selectively adjusting the position of said post means relative to said aperture, thereby to control the transmission of radiation from said transmitting waveguide to said receiving waveguide.

5. Apparatus as defined in claim 2, and further comprising second detector diode means arranged in said receiving waveguide and mounted on said plate means and said opposed major wall of said shell member, said first and second detector diode means being symmetrically arranged relative to said plate aperture.

6. Apparatus as defined in claim 1, and further comprising first divider means arranged within said transmitting waveguide normal to said plate means, said first divider means defining an oscillator resonant cavity for said microwave oscillator diode means, said first divider means further containing an aperture defining a radiation passage from said oscillator cavity to said shell member open end.

7. Apparatus as defined in claim 6, and further comprising first varactor diode means arranged within said oscillator resonant cavity and mounted on said plate means and said opposed major wall of said shell member.

8. Apparatus as defined in claim 7, and further comprising second divider means arranged within said receiving waveguide normal to said plate means, said second divider means defining a detector resonant cavity for each first microwave detector diode means, said second divider means further containing an aperture defining a radiation passage from said shell member open end to said detector cavity.

9. Apparatus as defined in claim 8, and further comprising second varactor diode means arranged within said detector resonant cavity and mounted on said plate means and said opposed major wall of said shell member.

10. Apparatus as defined in claim 6, and further comprising adjustable tuning post means arranged partially within said oscillator resonant cavity, said tuning post means being threadably connected with said shell member for selective vertical displacement within said oscillator resonant cavity.

11. Apparatus as defined in claim 1, and further comprising a horn antenna arranged adjacent said shell member open end.

12. Apparatus as defined in claim 1, and further including an antenna comprising a wedge-shaped block of dielectric material arranged adjacent said shell member open end.

13. Apparatus as defined in claim 1, wherein said shell member and said plate means are integrally extruded from a metallic material.

14. Apparatus as defined in claim 1, wherein said mounting means comprises

(1) bush means mounted on said plate means;

and

(2) threaded cap and collar means mounted on said opposed major wall of said shell member.

15. A microwave transmitting and receiving device, comprising

(a) an elongated hollow waveguide shell member open at one end and containing a chamber, said shell member having in vertical transverse cross section a rectangular configuration including opposed pairs of major and minor walls, respectively;

(b) planar plate means arranged within said chamber between, parallel with, and spaced from said major walls, said plate means bisecting said chamber to define a pair of waveguides having the same dimensions, respectively;

(c) microwave oscillator diode means arranged within one of said waveguides for transmitting radiation to said open end;

(d) first microwave detector diode means arranged within the other of said waveguides for receiving radiation from said open end;

(e) means for mounting said diode means within said pair of waveguides, respectively, said mounting means being connected with said plate means and said opposed major wall of said shell member, respectively;

(f) divider means arranged within said transmitting waveguide normal to said plate means, said divider means defining a resonant cavity for said microwave oscillator diode means, said divider means further containing an aperture defining a radiation passage from said cavity to said shell member open end; and

(g) PIN diode means mounted in said transmitting waveguide on the opposite side of said divider from said oscillator diode means, whereby radiation from said oscillator diode means is transmitted from said resonant cavity of said transmitting waveguide to said open end, and radiation is received by said detector diode means via said receiving waveguide.