US3412403A

US3412403A - Radiating tuned inductance coil antenna

Info

Publication number: US3412403A
Application number: US420373A
Authority: US
Inventors: Jr Carl I Peters
Original assignee: Carl I. Peters Jr.
Current assignee: CARL I PETERS JR
Priority date: 1964-12-22
Filing date: 1964-12-22
Publication date: 1968-11-19
Anticipated expiration: 1985-11-19

Description

1968 c. l. PETERS, JR 3,412,403

RADIAIING TUNED INDUCTANCE COIL ANTENNA Filed Dec. 22, 1964 INVENTOR. CAR! I. PETERS Ja.

ATTORNEY.

United States Patent 0 3,412,403 RADIATING TUNED INDUCTANCE COIL ANTENNA Carl I. Peters, Ira, 307-A Fowler Ave., China Lake, Calif. 93555 Filed Dec. 22, 1964, Ser. No. 420,373 1 Claim. (Cl. 343748) ABSTRACT OF THE DISCLOSURE This invention defines a novel antenna utilizing an inductor of a predetermined number of turns in which one or a group of more than one of these turns are shunted by a capacitor which may be variable and an R-F meter being in series with the capacitor in one embodiment thereof.

The main purpose of this invention is to radiate radio frequency energy using a transformation technique by which a few turns of an inductance becomes the radiation element. Heretofore the usual method has been the construction of a wire or steel array having mechanical dimensions directly related to the desired operating frequency. This method has the disadvantage that when once constructed the array responds to only one frequency unless mechanical modifications or adjustments are made. In the broadcast band such towers are very tall and constitute a hazard to air navigation. In military use it is often desirable to have one antenna perform on more than one frequency. In order to do this it is necessary to use matching systems.

It is, therefore, the general purpose and objective of this invention to provide a novel antenna for the propagation of the radiant energy having but two major components and capable of operating at high efficiency.

A more specific object of the invention is to provide an antenna of the character described that can be readily tuned for operation at different frequencies.

Another object of the invention is to provide a novel circuit for matching the transmission line characteristic output impedance into a value of one ohm or less, whereby in the transformation the circuit will radiate and act as an antenna.

Other objects and advantages will appear and be brought out more fully in the following specification, reference being had to the accompanying drawing.

In the drawing the figure shows in diagrammatic form a preferred embodiment of this invention.

In the drawing the numeral 1 indicates generally a coaxial cable or other transmission line, the terminals of which are connected to the ends of an inductance coil 2. This coil has a pair of variable taps which are connected through an ammeter 3 to a variable condenser 4. The assembly is mounted on a non-conductive material, and when finally adjusted, covered with a non-magnetic weather cover. It will be observed that the connections of the condenser to the coil are held at above ground potential.

In the operation of the invention the radio frequency energy impressed across the inductance, and the two taps 3,412,403 Patented Nov. 19, 1968 to the condenser will couple some of this energy into the condenser. In this circuit it will be noted that the inductance 2 comprises only a portion of the load that the source energy sees, by the transformation as to where the taps 5 are positioned and the resonant condition represented by the L of the coil and the C of the condenser. Along this this the reflection of the load back into the primary will add to the combination that makes up the efiective load for the exciting source. The radiation takes place in the area between the variable taps 5. Because the radiation is generated by the inductance, the radiated field is primarily of the H component. This is of great value in the RAD-HAZ problem because of the great reduction in generating an electric E field. The circuit is not limited to a 50 ohm impedence source but will work well with almost any output termination. The RF ammeter is used only to indicate when the circuit is operating at its peak efiiciency. By dipping a VSWR meter and maximizing the LC RF ammeter, it will be easy to adjust for proper frequency and maximum current. If the system were matching a one ohm load the ratio of current would be 7. Thus for every ampere in the feed line 7 amperes would appear in the circuit ammeter. It is in this manner that the circuit is adjusted and by direct comparison will perform as any antenna of the conventional style.

The wave propagated from the antenna of this invention is predominantly one containing the H component. This is due by generating large secondary currents through transformer action. The antenna circuitry matches the feed line impedance to a very low secondary resistance, accounting for the large currents. The antenna can be constructed to radiate on all frequencies by proper selection of the antenna components for the desired frequency range.

What is claimed is:

1. An antenna structure adapted for connection to an input circuit comprising:

an inductance having a predetermined number of turns connected across said input circuit;

a pair of adjustable output taps in electrically adjustable relationship with said inductance;

a variable capacitor electrically connected across said pair of adjustable taps;

said inductor and capacitor solely comprising the active radiating antenna element.

References Cited UNITED STATES PATENTS 1,092,294 4/1914 Schiessler 343-850 X 2,650,304 8/1953 Schlesinger 343--743 2,855,599 10/1958 Kandoian 343861 2,860,340 11/1958 Barret et a1. 343850 X 1,868,795 7/1932 Hansel] 343--865 3,078,348 2/1963 McIntosh 179-82 3,179,941 4/ 1965 Harris et a1. 343-895 FOREIGN PATENTS 676,743 12/ 1963 Canada.

ELI LIEBERMAN, Primary Examiner.