US3701161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four band slot antenna
Assignee: Smiths Interconnect Inc
•
Filing: 1970-05-11
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Granted: 1972-10-24
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Expires: 1990-05-11
Abstract
Abstract A multiple radiator microwave antenna comprising four separate discretely tuned cavity-backed slot antennas for providing a unidirectional radiated RF energy field in a narrow beam along a common axis at four discrete frequencies.
Inventors
- 👤 Benjamin F Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:17
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A multiple radiator microwave antenna comprising; a cylindrical body portion having front and rear members terminating said body portion; an electrically conductive member mounted within said body portion abutting said front member and spaced from said rear member; at least one substantially semicylindrical cavity formed within said conductive member; a radiating slot in said front member opening into said at least one cavity along the diameter of the cavity; a substantially cylindrical microwave cavity formed by the volume between said rear member and said electrically conductive member; another radiating slot in said front member opening into said cylindrical microwave cavity such that a portion of the electrically conductive body is removed in width equal to the width of said another radiating slot; and means for introducing RF electromagnetic energy into said cavities such that said cavities are resonant at particular frequencies and radiate energy from said slots in narrow beams normal to said front member.
Claim 2
Dependent Claim
155 words
A multiple radiator microwave antenna comprising; a cylindrical body portion having front and rear members terminating said body portion; an electrically conductive member mounted within said body portion abutting said front member and spaced from said rear member; at least one substantially semicylindrical cavity formed within said conductive member; a radiating slot in said front member opening into said at least one cavity along the diameter of the cavity; a substantially cylindrical microwave cavity formed by the volume between said rear member and said electrically conductive member; another radiating slot in said front member opening into said cylindrical microwave cavity such that a portion of the electrically conductive body is removed in width equal to the width of said another radiating slot; and means for introducing RF electromagnetic energy into said cavities such that said cavities are resonant at particular frequencies and radiate energy from said slots in narrow beams normal to said front member.
Claim 3
Dependent Claim
82 words
A multiple radiator microwave antenna as set forth in claim 1 and further including; a second substantially semicylindrical cavity formed within said conductive member; a second radiating slot in said front member opening into the second cavity along the diameter of the second cavity; and additional means for introducing electromagnetic energy into the second cavity such that the second cavity is resonant at a particular frequency and radiates energy from the second slot in a narrow beam normal to said front member.
Claim 4
Dependent Claim
83 words
A multiple radiator microwave antenna as set forth in claim 2 and further including; a third substantially semicylindrical cavity formed within said conductive member; a third radiating slot in said front member opening into the third cavity along the diameter of the third cavity; and further means for introducing RF electromagnetic energy into the third cavity such that the third cavity is resonant at a particular frequency and radiates energy from the third slot in a narrow beam normal to said front member.
Claim 5
Dependent Claim
36 words
A multiple radiator microwave antenna as set forth in claim 1 wherein; said another radiating slot in said fronT member opening into said cylindrical microwave cavity divides said electrically conductive member into two physically separate portions.
Claim 6
Dependent Claim
61 words
A multiple radiator microwave antenna as set forth in claim 1 wherein; said another radiating slot in said front member opening into said cylindrical microwave cavity is equal in length to the diameter of said front member and wherein said another radiating slot continues around a portion of said front member at either end of the diameter of the front member.
Claim 7
Dependent Claim
47 words
A multiple radiator microwave antenna as set forth in claim 5 wherein; each of the radiating slots is of the length substantially equal to one half wavelength at the frequency to be radiated and further including; adjustable loading means in said cylindrical cavity for loading said cavity.
References Cited (Backward Citations)
US3296616A
Cited
US3312976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |