US4801944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna
Assignee: DTG PATENT PARTNERSHIP
•
Filing: 1987-10-13
•
Granted: 1989-01-31
•
Expires: 2007-10-13
Abstract
Abstract An antenna which utilizes a conductive loop shaped element and a conductive tap element. The tap element is located directly adjacent the loop element and is precisely tapped to the loop element at one-half the length of the loop element. Connecting between the output terminal of the antenna and terminals of the loop element and the tap element are a plurality of tuning capacitors. The resulting antenna is small in size and is sensitive to a wide band of frequencies with respect to the center frequency of the antenna.
Inventors
- 👤 Peter A. Madnick
- 👤 Russell W. Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:08
CPC Classifications
H; H01; H01Q; H01Q7/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
An antenna comprising: an electrically conducted loop element terminating in a first terminal and a second terminal, said first terminal being electrically grounded; a first capacitor connected between said first terminal and said second terminal; an electrically conductive tap element mounted directly adjacent to said loop element but spaced therefrom, said tap element being substantially of a length equal to one half the length of said loop element, one end of said tap element connecting directly to said loop element with the other end of said tap element connecting to a third terminal; a second capacitor connected between said second terminal and said third terminal; and a fourth terminal functioning as the output terminal for said antenna, a third capacitor connected between said third terminal and said fourth terminal.
Claim 2
Dependent Claim
129 words
An antenna comprising: an electrically conducted loop element terminating in a first terminal and a second terminal, said first terminal being electrically grounded; a first capacitor connected between said first terminal and said second terminal; an electrically conductive tap element mounted directly adjacent to said loop element but spaced therefrom, said tap element being substantially of a length equal to one half the length of said loop element, one end of said tap element connecting directly to said loop element with the other end of said tap element connecting to a third terminal; a second capacitor connected between said second terminal and said third terminal; and a fourth terminal functioning as the output terminal for said antenna, a third capacitor connected between said third terminal and said fourth terminal.
Claim 3
Dependent Claim
24 words
The antenna as defined in claim 1 wherein: said ends of said tap element being precisely located diametrically opposite relative to said loop element.
Claim 4
Dependent Claim
18 words
The antenna as defined in claim 1 wherein: said tap element being located exteriorly of said loop element.
Claim 5
Dependent Claim
25 words
The antenna as defined in claim 1 wherein: the entire length of said tap element being precisely spaced the same distance from said loop element.
Claim 6
Dependent Claim
18 words
The antenna as defined in claim 1 wherein: said loop element being circular, said tap element being semi-circular.
Claim 7
Dependent Claim
167 words
An antenna comprising: an electrically conducted loop element terminating in a first terminal and a second terminal, said first terminal being electrically grounded; a first capacitor connected between said first terminal and said second terminal; an electrically conductive tap element mounted directly adjacent to said loop element but spaced therefrom, said tap element being substantially of a length equal to one half the length of said loop element, one end of said tap element connecting directly to said loop element with the other end of said tap element connecting to a third terminal; a second capacitor connected between said second terminal and said third terminal; a fourth terminal functioning as the output terminal for said antenna, a third capacitor connected between said third terminal and said fourth terminal; and said loop element being approximately four and one-half inches in diameter, said first capacitor having a value of 2.5 picofarads, said second capacitor having a value of 27 picofarads, said third capacitor having a value of 47 picofarads.
Claim 8
Dependent Claim
167 words
An antenna comprising: an electrically conducted loop element terminating in a first terminal and a second terminal, said first terminal being electrically grounded; a first capacitor connected between said first terminal and said second terminal; an electrically conductive tap element mounted directly adjacent to said loop element but spaced therefrom, said tap element being substantially of a length equal to one half the length of said loop element, one end of said tap element connecting directly to said loop element with the other end of said tap element connecting to a third terminal; a second capacitor connected between said second terminal and said third terminal; a fourth terminal functioning as the output terminal for said antenna, a third capacitor connected between said third terminal and said fourth terminal; and said loop element being approximately four and one-half inches in diameter, said first capacitor having a value of 2.5 picofarads, said second capacitor having a value of 27 picofarads, said third capacitor having a value of 47 picofarads.
References Cited (Backward Citations)
US2474238A
Cited
US2469209A
Cited
US2610296A
Cited
US2657312A
Cited
US2751590A
Cited
US2960693A
Cited
US3281847A
Cited
US3573830A
Cited
US3582951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |