US3852756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically small resonant antenna with capacitively coupled load
Assignee: United States Department of the Navy
•
Filing: 1974-02-15
•
Granted: 1974-12-03
•
Expires: 1994-02-15
Abstract
Abstract An antenna having dimensions as small as 0.03 wavelength of the wavelength to be received comprising a helix wire having a loading disc attached to one end and an RF connector attached to the other. The connector shield is mounted on a grounded disc and a conductive member is electrically associated with, but spaced from the loading disc.
Inventors
- 👤 J Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:19
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/32; H01Q9/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
198 words
A physically small resonant antenna designed for utilization in applications having a relatively small volume in which to position an antenna for the wavelength to be transmitted or received, comprising: an electRically conductive helical member having first and second opposite ends; means for reducing the capacitive reactance of said antenna, including first and second electrically conductive members wherein said members are physically spaced apart and the first member is coupled near the first end of said helical member; circuit means for processing an electrical signal, having at least first and second terminals; a coaxial member having a plurality of electrically conductive elements wherein the first element couples said circuit means to the second end of said helical member; and an electrically conductive enclosure containing said circuit means and said coaxial member, wherein the second terminal of said circuit means is coupled by the second element of said coaxial member to said enclosure; such that said antenna is a dipole antenna having first and second arms wherein the apparent electrical length of the first arm sufficiently approximates the electrical length of the second arm so that said antenna operates as a dipole antenna for the chosen frequency of interest.
Claim 2
Dependent Claim
198 words
A physically small resonant antenna designed for utilization in applications having a relatively small volume in which to position an antenna for the wavelength to be transmitted or received, comprising: an electRically conductive helical member having first and second opposite ends; means for reducing the capacitive reactance of said antenna, including first and second electrically conductive members wherein said members are physically spaced apart and the first member is coupled near the first end of said helical member; circuit means for processing an electrical signal, having at least first and second terminals; a coaxial member having a plurality of electrically conductive elements wherein the first element couples said circuit means to the second end of said helical member; and an electrically conductive enclosure containing said circuit means and said coaxial member, wherein the second terminal of said circuit means is coupled by the second element of said coaxial member to said enclosure; such that said antenna is a dipole antenna having first and second arms wherein the apparent electrical length of the first arm sufficiently approximates the electrical length of the second arm so that said antenna operates as a dipole antenna for the chosen frequency of interest.
Claim 3
Dependent Claim
31 words
The antenna of claim 1 wherein the first member of said reactance reducing means is an element having a circular profile which is attached at its center to said helical member.
Claim 4
Dependent Claim
75 words
The antenna of claim 2 wherein said enclosure is a missile body including a ground plate to which said coaxial member is attached and said second element of said coaxial member is electrically connected, and through which said first element of said coaxial member passes to said helical member, wherein said missile body also includes an electrically non-conductive shroud in covering relationship to said helical member and the first member of said reactance reducing means.
Claim 5
Dependent Claim
32 words
The antenna of claim 3 wherein the second member of said reactance reducing means is on the outer surface of said shroud with respect to the first member of said reducing means.
Claim 6
Dependent Claim
31 words
The antenna of claim 4 wherein said coaxial member is a coaxial cable having its inner conductor connected to said helical member and its outer conductor connected to said ground plate.
Claim 7
Dependent Claim
18 words
The antenna of claim 5 including an annual member having a high dielectric constant surrounding said helical member.
Claim 8
Dependent Claim
16 words
The antenna of claim 6 wherein the first member of said reducing means is a cone.
Claim 9
Dependent Claim
16 words
The antenna of claim 6 wherein the first member of said reducing means is a disc.
Claim 10
Dependent Claim
38 words
The antenna of claim 6 wherein the first member of said reducing means is a plurality of arms radiating at right angles to the helical member, connected to one another at their outermost extremity by a circular ring.
Claim 11
Dependent Claim
30 words
The antenna of claim 6 wherein the length of said antenna is less than one-tenth the wavelength of the electrical signal, and the antenna and circuit means form a radar.
References Cited (Backward Citations)
US3573840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |