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US 4,901,040 AGranted
Reduced-height waveguide-to-microstrip transition
AssigneesAmerican Telephone and Telegraph Company, AT&T Bell Laboratories
InventorsWilliam G. Ahlborn, Harry F. Lenzing, You-Sun Wu
Life of this patent
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Abstract
The present invention relates to a transition wherein a microstrip line, formed on one major surface of a substrate, is capacitively coupled to a reduced-height waveguide, comprising a predetermined width-to-height ratio, by means of a T-bar conductive pattern formed on a substrate at the end of the microstrip line. Such T-bar transitions can also be connected on opposite end of the microstrip line to provide connections between two waveguide sections.
Claims7
A waveguide transition comprising:
- a reduced-height waveguide section for propagating electromagnetic signals in at least one predetermined frequency band;
- and
- a microstrip transition for insertion through an aperture in the reduced-height waveguide section in a transverse plane of the reduced-height waveguide section, and for transmitting or receiving the electromagnetic signals propagating in the reduced-height waveguide section, the microstrip transition comprising,
- a substrate formed from a non-conductive material comprising a first and a second opposing major surface,
- a conductive layer formed on the first major surface of the substrate comprising a T-bar configuration, where the arms of the T-bar configuration are disposed parallel to and near a first end of the substrate that is inserted into the reduced-height waveguide section to provide a predetermined capacitance component with the nearest wall of the reduced-height waveguide section, and the body of the T-bar configuration emanating from only one side of the arms extends a predetermined distance within the reduced-height waveguide section to provide a predetermined inductance component, and
- a ground plane conductive layer formed on the second major surface of the substrate, the ground plane layer being excluded from at least the area opposite the T-bar configuration.
3 more elements
Dependencies are inferred from the claim text.