US3969691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Millimeter waveguide to microstrip transition
Assignee: United States Department of the Navy
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Filing: 1975-06-11
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Granted: 1976-07-13
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Expires: 1995-06-11
Abstract
Abstract A waveguide to microstrip transition apparatus in which a waveguide coupledo a microstrip circuit is provided with a mode filter for suppressing spurious modes of electromagnetic signal propagation. The mode filter is attached to the end of the waveguide that is coupled to the microstrip circuit and the mode filter extends over a portion of the microstrip circuit.
Inventors
- 👤 David L. Saul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:40
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16; H01P5/00; H01P5/08; H01P5/10; H01P5/107
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A waveguide to microstrip transition apparatus comprising: a waveguide; a section of microstrip circuit coupled to said waveguide; and mode filter means connected to said waveguide and extending over a portion of said section of microstrip circuit for preventing spurious modes of propagation beyond said waveguide, said mode filter means comprising a partially enclosed conductive cavity having an opening facing said portion of said section of microstrip circuit, said opening extending over said section of microstrip circuit.
Claim 2
Dependent Claim
77 words
A waveguide to microstrip transition apparatus comprising: a waveguide; a section of microstrip circuit coupled to said waveguide; and mode filter means connected to said waveguide and extending over a portion of said section of microstrip circuit for preventing spurious modes of propagation beyond said waveguide, said mode filter means comprising a partially enclosed conductive cavity having an opening facing said portion of said section of microstrip circuit, said opening extending over said section of microstrip circuit.
Claim 3
Dependent Claim
56 words
The apparatus of claim 1 wherein: said waveguide is a rectangular waveguide including a ridgeline transformer section; said ridgeline transformer section being chamfered at one end; a tab connected to said chamfered end; said section of microstrip circuit being coupled to said waveguide by said tab; and said partially enclosed conductive cavity extending over said tab.
Claim 4
Dependent Claim
36 words
The apparatus of claim 2 wherein said conductive cavity is sufficiently large to permit the radiation of energy from said tab without interference and sufficiently small to prevent resonance of the energy radiating from said tab.
Claim 5
Dependent Claim
21 words
The apparatus of claim 3 wherein a space is provided between said mode filter means and said section of microstrip circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |