Waveguide-microstrip transition arrangement

• US 4,550,296 A
• Filed: 05/12/1983
• Issued: 10/29/1985
• Est. Priority Date: 05/13/1982
• Status: Expired due to Term

• Current Assignee: Ant Nachrichtentechnik GmbH (Robert Bosch GmbH)
• Original Assignee: Ant Nachrichtentechnik GmbH (Robert Bosch GmbH)
• Inventors: Alberty, Michael, Ehrlinger, Wolfgang, Hirsch, Gerhard
• Primary Examiner(s): LaRoche, Eugene R.
• Assistant Examiner(s): Lee, Benny T.
• Application Number:
  US06/493,824
• Time in Patent Office: 901 Days
• Field of Search: 333/26, 333/21 R, 333/246, 333/33, 333/248
• US Class Current: 333/26
• CPC Class Codes: H01P 5/107 Hollow-waveguide/strip-line transitions

Abstract

A waveguide-microstrip transition arrangement including, a waveguide section and a microstrip portion, for coupling waveguide modes between the waveguide section and the microstrip portion. The waveguide section has waveguide walls defining waveguide wall surfaces including a short-circuited end wall surface and side wall surfaces. A channel passes through one of the side walls and presents an opening at the associated wall surface. The microstrip portion includes a substrate having opposite sides with a ground plane disposed on one side of the substrate and a microstrip conductor disposed on the other side of the substrate. The substrate passes through the waveguide section, entering the waveguide section at a location where the wall currents of the waveguide section flowing transversely to the substrate are at a miniumum. A portion of the microstrip conductor is disposed on the substrate to pass through the channel into the waveguide section free of contact with the waveguide walls. The substrate has no ground plane in the regions of the interior of the waveguide section and of the plane of separation of the waveguide wall where the substrate is disposed. The ground plane extends into and terminates within the channel.

Claims

1. In a waveguide-microstrip transition arrangement, including a waveguide section and a microstrip portion for coupling waveguide modes between the waveguide section and the microstrip portion, the waveguide section having waveguide walls defining waveguide wall surfaces including a short-circuited end wall surface and side wall surfaces with a channel passing through one of the side walls and presenting an opening at the associated wall surface and the microstrip portion including a substrate having opposite sides with a ground plane disposed on one side of the substrate and a microstrip conductor disposed on the other side of the substrate, the waveguide wall surfaces defining the interior of the waveguide section, the improvement wherein said waveguide section comprises two parts which join together at a plane of separation which passes through the walls of said waveguide section at a location where the wall currents of said waveguide section flowing transversely to said plane of separation are at a minimum, said substrate is disposed in said plane of separation, a portion of said microstrip conductor is disposed on said substrate to pass through said channel into said waveguide section free of contact with said waveguide walls, said substrate has no ground plane in the regions of the interior of said waveguide section and of the plane of separation of said waveguide walls where the substrate is disposed, except that said ground plane extends into and terminates within said channel so as to make contact with said one waveguide side wall only within the region of said channel.

2. A transition arrangement according to claim 1 and further including a housing having a front wall with a region shaped to define said waveguide section, said housing comprising two parts which join together at the plane of separation to form said waveguide section.

3. A transition arrangement according to claim 1, wherein said channel has a broad dimension which is less than one-half of the free space wavelength of the highest signal frequency transmitted by said arrangement.