US3973263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitivity improvement of spaced-loop antenna by capacitive gap loading
Assignee: United States Department of the Navy
•
Filing: 1973-04-20
•
Granted: 1976-08-03
•
Expires: 1993-04-20
Abstract
Abstract An improved antenna system having a plurality of loop antennas surrounded coaxial shields which have dual electrostatic shield gaps therein. A shunt capacitance is placed across each of the shield gaps. The shunt capacitances are matched and variable among discrete values. Variation of the capacitances provides increased antenna sensitivity without a change in physical dimensions of the antenna.
Inventors
- 👤 Terence C. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:14
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q7/04; H01Q21/00; H01Q21/06; H01Q21/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
In a shielded, coaxial, spaced-loop antenna having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, all networks having an equal number of corresponding capacitor elements, corresponding elements of different networks having substantially the same value; and means associated with each network for selectively connecting each element individually and across each of said shield gaps.
Claim 2
Dependent Claim
82 words
In a shielded, coaxial, spaced-loop antenna having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, all networks having an equal number of corresponding capacitor elements, corresponding elements of different networks having substantially the same value; and means associated with each network for selectively connecting each element individually and across each of said shield gaps.
Claim 3
Dependent Claim
83 words
In a shielded, eight-loop, crossed, spaced-loop antenna having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, all networks having an equal number of corresponding capacitor elements, corresponding elements of different networks having substantially the same value; and means associated with each network for selectively connecting each element individually and across each of said shield gaps.
Claim 4
Dependent Claim
83 words
In a shielded, eight-loop, crossed, spaced-loop antenna having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, all networks having an equal number of corresponding capacitor elements, corresponding elements of different networks having substantially the same value; and means associated with each network for selectively connecting each element individually and across each of said shield gaps.
Claim 5
Dependent Claim
70 words
In a shielded, coaxial, spaced-loop antenna, having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, said value of said capacitance being at or near the value which causes resonance of the shield of each shield loop to occur at said predetermined frequency.
Claim 6
Dependent Claim
70 words
In a shielded, coaxial, spaced-loop antenna, having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, said value of said capacitance being at or near the value which causes resonance of the shield of each shield loop to occur at said predetermined frequency.
Claim 7
Dependent Claim
108 words
In a shielded, coaxial, spaced-loop antenna having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, all networks having an equal number of corresponding capacitor elements, corresponding elements of different networks having substantially the same value; and means associated with each network for selectively connecting each element individually and across each of said shield gaps, said value of each said capacitance network being at or near the value which causes resonance of each shield loop to occur at said predetermined frequency.
Claim 8
Dependent Claim
108 words
In a shielded, coaxial, spaced-loop antenna having a plurality of gaps in its shield, the improvement comprising: a capacitance network individual to and across each gap, each said network having substantially the same value, whereby increased sensitivity is achieved at a predetermined frequency, all networks having an equal number of corresponding capacitor elements, corresponding elements of different networks having substantially the same value; and means associated with each network for selectively connecting each element individually and across each of said shield gaps, said value of each said capacitance network being at or near the value which causes resonance of each shield loop to occur at said predetermined frequency.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |