US4901040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced-height waveguide-to-microstrip transition
Assignee: Nokia Bell Labs
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Filing: 1989-04-03
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Granted: 1990-02-13
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Expires: 2009-04-03
Abstract
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.
Inventors
- 👤 William G. Ahlborn
- 👤 Harry F. Lenzing
- 👤 You-Sun Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:56
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08; H01P5/10; H01P5/107
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
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.
Claim 2
Dependent Claim
194 words
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.
Claim 3
Dependent Claim
67 words
A waveguide transition according to claim 1 wherein the T-bar configuration includes a width and a height that approximates a one-quarter wavelength of a signal to be transmitted to or received from the reduced-height waveguide section by the transition, where the width and height are defined as a distance along an extended arm and the body, respectively, of the T-bar when inserted in the reduced-height waveguide section.
Claim 4
Dependent Claim
36 words
A waveguide transition according to claim 2 wherein the width and height are adjusted to provide a predetermined radiation resistance relative to a predetermined frequency band when the T-bar configuration is disposed within the waveguide section.
Claim 5
Dependent Claim
90 words
A waveguide transition according to claim 1, 2 or 3 wherein the T-bar configuration is disposed on the first major surface of the substrate to not make contact with a wall of the reduced-height waveguide section when the T-bar configuration is disposed through the aperture and within the reduced-height waveguide section; and the conductive ground plane is disposed on the second major surface of the substrate to make contact with at least one waveguide wall when the T-bar configuration is disposed through the aperture and within the reduced-height waveguide section.
Claim 6
Dependent Claim
115 words
A waveguide transition according to claim 1, 2 or 3 whrein the waveguide transition comprises a second reduced-height waveguide section disposed near the first reduced-height waveguide section, and the conductive layer formed on the first major surface of the substrate comprises a second T-bar configuration which is disposed near, but not in contact with, a second end of the substrate opposite the first end of the first major surface for forming a second waveguide-to-microstrip transition when the second T-bar configuration is disposed through an aperture in, and in a transverse plane of, the second reduced-height waveguide section, the bodies of the first and second T-bar configurations being coupled together either directly or through a circuit.
Claim 7
Dependent Claim
73 words
A waveguide transition according to claim 5 wherein the height and/or width of the first and the second configurations are different and each transition includes a width and height that approximates a one-quarter wavelength of a signal propagating in the associated reduced-height waveguide section, where the width and height are defined as a distance along an arm and a body, respectively, of the T-bar configuration when inserted in the associated reduced-height waveguide section.
Claim 8
Dependent Claim
51 words
A waveguide transition accoding to claim 6 wherein each of the first and second T-bar configurations has a width and a height to provide a predetermined radiation resistance in a predetermined frequency band when the first and second T-bar configurations are inserted into the first and second reduced-height waveguide sections, respectively.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |