US3823403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiturn loop antenna
Assignee: Ohio State University Research Foundation
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Filing: 1971-06-09
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Granted: 1974-07-09
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Expires: 1991-06-09
Abstract
Abstract The invention is a multiturn loop antenna of an efficient design suitable for use singly, in arrays, or for inductively exciting radiating currents on a structure - the surface and the elements radiating to achieve optimum system performance. The antenna may be fed balanced or unbalanced and its input impedance may be either capacitive or inductive. In a preferred embodiment for omnidirectional coverage the antenna is positioned in a dielectric or ferrite filled cavity; the antenna may be a single element for linear polarization or a pair of multiturn loops at right angles to each other and with 90* phasing to effect circular polarization.
Inventors
- 👤 C Walter
- 👤 B Munk
- 👤 G Thiele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:27
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/286; H01Q19/00; H01Q19/06; H01Q19/09; H01Q7/00; H01Q1/273
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
45 words
An antenna comprising an electrically conducting surface, and a multiturn element having an overall length substantially at 1/4 wavelength or odd multiples thereof; a capacitance means terminating one end of said multiturn element to said surface, and an unbalanced feed further comprising a matching capacitance.
Claim 2
Dependent Claim
45 words
An antenna comprising an electrically conducting surface, and a multiturn element having an overall length substantially at 1/4 wavelength or odd multiples thereof; a capacitance means terminating one end of said multiturn element to said surface, and an unbalanced feed further comprising a matching capacitance.
Claim 3
Dependent Claim
35 words
An antenna system as set forth in claim 1 wherein said capacitor further comprises a capacitor in series with said multiturn element and said surface to finely adjust the apparent electrical length of said loops.
Claim 4
Dependent Claim
35 words
An antenna system as set forth in claim 1 wherein said capacitor further comprises a capacitor in parallel with said multiturn element and said surface to finely adjust the apparent electrical length of said loops.
Claim 5
Dependent Claim
31 words
An antenna system as set forth in claim 1 further comprises dielectric loading means of said multiturn element to lower the frequencies at which the resistance peaks of said elements occur.
Claim 6
Dependent Claim
15 words
The antenna of claim 1 wherein said multiturn loop is embedded in a ferrite material.
Claim 7
Dependent Claim
29 words
An antenna as set forth in claim 1 wherein said loop further comprises a discontinuity which varies the length of said loop as a function of said operating frequency.
Claim 8
Dependent Claim
15 words
An antenna of claim 1 wherein said multiturn loop is embedded in a dielectric material.
Claim 9
Dependent Claim
25 words
The antenna of claim 1 wherein said multiturn element comprises a first multiturn loop and a second multiturn loop to provide an omnidirectional radiation pattern.
Claim 10
Dependent Claim
20 words
The antenna of claim 1 wherein said first and second loops are positioned at right angles relative to one another.
Claim 11
Dependent Claim
18 words
An omnidirectional antenna of claim 8 wherein each of said multiturn loops is tuned to the same frequency.
Claim 12
Dependent Claim
29 words
An omnidirectional antenna of claim 8 wherein said first multiturn loop is tuned slightly lower and second multiturn loop tuned slightly higher than the operating frequency of said antenna.
Claim 13
Dependent Claim
20 words
An omnidirectional antenna of claim 9 wherein said right angle position comprises positioning said multiturn loops in a common plane.
Claim 14
Dependent Claim
20 words
An omnidirectional antenna of claim 9 wherein said right angle position comprises positioning said multiturn loops one above the other.
Claim 15
Dependent Claim
16 words
An omnidirectional antenna of claim 9 wherein said multiturn loops are intertwined one within the other.
Claim 16
Dependent Claim
28 words
An omnidirectional antenna of claim 9 wherein said conductive surface is a cavity and wherein said first and second right angle multiturn loops are positioned in said cavity.
Claim 17
Dependent Claim
22 words
An omnidirecTional antenna of claim 15 wherein said cavity is a single cavity and said loops are positioned in said single cavity.
Claim 18
Dependent Claim
36 words
An omnidirectional antenna of claim 15 wherein said cavity is a pair of cavities and said first multiturn loop is positioned in said first cavity and said second multiturn loop is positioned in said second cavity.
Claim 19
Dependent Claim
25 words
An omnidirectional antenna of claim 13 wherein said cavity further comprises material loading means for said loops to vary the resonant frequency of said loops.
Claim 20
Dependent Claim
14 words
An omnidirectional antenna of claim 16 wherein said material loading means is a dielectric.
Claim 21
Dependent Claim
14 words
An omnidirectional antenna of claim 16 wherein said material loading means is a ferrite.
Claim 22
Dependent Claim
30 words
An antenna system as set forth in claim 16 further comprises ferrite loading means of said loops to lower the frequencies at which the resistance peaks of said elements occur.
References Cited (Backward Citations)
US3235805A
Cited
US3012246A
Cited
US3365721A
Cited
US3440542A
Cited
US3569979A
Cited
US3641580A
Cited
US3646562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |