US3631499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically small double-loop antenna with distributed loading and impedance matching
Assignee: Individual
•
Filing: 1970-08-17
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Granted: 1971-12-28
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Expires: 1990-08-17
Abstract
Abstract Relatively uniform impedance and broad bandwidth is obtained in a double-loop electrically small antenna by transformer coupling in phase opposition the ends of the loops. For receiving, amplification may be added within the loops to increase the effective electrical output of the antenna. The electrical output of the antenna may be remotely controlled at the receiver, to preclude overloading the receiver, by changing the potential supplied the amplifier over the conventional signal transmission line connecting the receiver to the antenna.
Inventors
- 👤 Edwin M Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
An electrically small broadband antenna having output connections of a nominal high output impedance of 300 ohms and of a nominal low output impedance of 70 ohms for connecting to respective impedance transmission lines comprising: a. a right-hand open-loop conductive element having an upper terminating end and a lower terminating end; b. A left-hand open-loop conductive element having an upper terminating end and a lower terminating end; c. a radiofrequency transformer having a high-impedance winding and a low-impedance winding with a turns ratio between the said winding of approximately 2.1 to 1; d. means for connecting the high-impedance winding between the said lower terminating ends of the said right- and left-hand open loops and the low-impedance winding between the said upper terminating ends of the said right- and left-hand open loops; e. means cooperating with the said high-impedance transformer winding for connecting a high-impedance transmission line; and f. means cooperating with the said low-impedance transformer winding for connecting a low-impedance transmission line.
Claim 2
Dependent Claim
162 words
An electrically small broadband antenna having output connections of a nominal high output impedance of 300 ohms and of a nominal low output impedance of 70 ohms for connecting to respective impedance transmission lines comprising: a. a right-hand open-loop conductive element having an upper terminating end and a lower terminating end; b. A left-hand open-loop conductive element having an upper terminating end and a lower terminating end; c. a radiofrequency transformer having a high-impedance winding and a low-impedance winding with a turns ratio between the said winding of approximately 2.1 to 1; d. means for connecting the high-impedance winding between the said lower terminating ends of the said right- and left-hand open loops and the low-impedance winding between the said upper terminating ends of the said right- and left-hand open loops; e. means cooperating with the said high-impedance transformer winding for connecting a high-impedance transmission line; and f. means cooperating with the said low-impedance transformer winding for connecting a low-impedance transmission line.
Claim 3
Dependent Claim
38 words
An electrically small antenna for operation over the frequency band of approximately 50 MegaHertz to approximately 225 MegaHertz having a nominal 300-ohm output impedance and a nominal 70-ohm output impedance comprising: a. a dielectric printed circuit board having:
Claim 4
Dependent Claim
38 words
An electrically small antenna for operation over the frequency band of approximately 50 MegaHertz to approximately 225 MegaHertz having a nominal 300-ohm output impedance and a nominal 70-ohm output impedance comprising: a. a dielectric printed circuit board having:
Claim 5
Dependent Claim
161 words
an approximately 5/8 -inch-wide copper strip forming a left-hand open-loop conductive element having a height of approximately 13 1/2 inches and a width of approximately 7 inches, and an upper terminating end and a lower terminating end, the upper and lower terminating ends being juxtapositioned the respective said upper and lower terminating ends of the said right-hand open loop; b. a radiofrequency transformer suitable for operation over the frequency from approximately 50 MegaHertz to approximately 225 MegaHertz, having a first winding and a secondary winding with a turns ratio between the windings of approximately 2.1 to 1; c. means for connecting the said first winding of the transformer between the said upper terminating ends of the said loops and the said second winding of the transformer between the said lower terminating ends of the said loops; d. means connecting with the said first windings for providing an output; and e. means connecting with the said second winding for providing an output.
Claim 6
Dependent Claim
161 words
an approximately 5/8 -inch-wide copper strip forming a left-hand open-loop conductive element having a height of approximately 13 1/2 inches and a width of approximately 7 inches, and an upper terminating end and a lower terminating end, the upper and lower terminating ends being juxtapositioned the respective said upper and lower terminating ends of the said right-hand open loop; b. a radiofrequency transformer suitable for operation over the frequency from approximately 50 MegaHertz to approximately 225 MegaHertz, having a first winding and a secondary winding with a turns ratio between the windings of approximately 2.1 to 1; c. means for connecting the said first winding of the transformer between the said upper terminating ends of the said loops and the said second winding of the transformer between the said lower terminating ends of the said loops; d. means connecting with the said first windings for providing an output; and e. means connecting with the said second winding for providing an output.
Claim 7
Dependent Claim
150 words
a left-hand open-loop conductive element having an upper terminating end and a lower terminating end; b. a radiofrequency transformer suitable for operation over the frequency from 50 MegaHertz to 225 MegaHertz, having a first winding and a second winding; c. means for connecting the first winding of the said transformer between the upper terminating ends of the said right- and left-hand open-loop elements; d. a radiofrequency amplifier having an input and an output and suitable for operation over at least the frequency range from 50 MegaHertz to 225 MegaHertz; e. means for connecting the input of the said radiofrequency amplifier with the said lower terminating ends of the said right- and left-hand open-loop elements; f. means for connecting the output of the said radiofrequency amplifier to the second winding of the said transformer; and g. means cooperating with the said amplifier for providing an output to the said transmission line.
Claim 8
Dependent Claim
150 words
a left-hand open-loop conductive element having an upper terminating end and a lower terminating end; b. a radiofrequency transformer suitable for operation over the frequency from 50 MegaHertz to 225 MegaHertz, having a first winding and a second winding; c. means for connecting the first winding of the said transformer between the upper terminating ends of the said right- and left-hand open-loop elements; d. a radiofrequency amplifier having an input and an output and suitable for operation over at least the frequency range from 50 MegaHertz to 225 MegaHertz; e. means for connecting the input of the said radiofrequency amplifier with the said lower terminating ends of the said right- and left-hand open-loop elements; f. means for connecting the output of the said radiofrequency amplifier to the second winding of the said transformer; and g. means cooperating with the said amplifier for providing an output to the said transmission line.
Claim 9
Dependent Claim
35 words
An electrically small receiving antenna for operation over the frequency band of approximately 50 MegaHertz to approximately 225 MegaHertz and providing an output to a transmission line comprising: a. a dielectric printed circuit board having,
Claim 10
Dependent Claim
35 words
An electrically small receiving antenna for operation over the frequency band of approximately 50 MegaHertz to approximately 225 MegaHertz and providing an output to a transmission line comprising: a. a dielectric printed circuit board having,
Claim 11
Dependent Claim
22 words
The antenna as claimed in claim 3 wherein the said right-hand open-loop element and the said left-hand open-loop element contain lumped loading.
Claim 12
Dependent Claim
22 words
The antenna as claimed in claim 3 wherein the said right-hand open-loop element and the said left-hand open-loop element contain distributed loading.
Claim 13
Dependent Claim
63 words
The antenna as claimed in claim 3 wherein the said right-hand open-loop element is approximately a 5/8 -inch-wide copper strip having a height of approximately 13 1/2 inches and a width of approximately 7 inches and the said left-hand open-loop element is approximately a 5/8 -inch-wide copper strip having a height of approximately 13 1/2 inches and a width of approximately 7 inches.
Claim 14
Dependent Claim
20 words
The antenna as claimed in claim 6 wherein the said transformer has a turns ratio of approximately 2.1 to 1.
Claim 15
Dependent Claim
19 words
The antenna as claimed in claim 7 wherein the said amplifier has a gain of less than 25 db.
References Cited (Backward Citations)
US3172111A
Cited
US3484697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |