US1688875A - Loop aerial - Google Patents

Description

P. D. MORRIS LOOP AERIAL Filed Dec. 5, 1927 m M m N I 79904. D. MafiR/s A TTORNE Y.

Patented Oct. 23, 1928.

UNITED STATES PAUL D. MORRIS, OF BERLIN, MARYLAND.

LOO]? AERIAL.

Application filed December 3, 192 7. Serial No. 237,545.

This invention relates generally to radio aerials, but more particularly to those of the coil or loop type.

One object of this invention is to provide an efficient non-directional aerial which is of sturdy construction and compact form, and which'may be used out of doors and not be affected by, a variance in climatic conditions or storms.

Another object concerns the provision of an aerial which is of simple construction and which may be easily and cheaply manufactured and assembled and readily restrung.

With these and other objects in view. this invention consists in certain novel details of construction, combination and arrangement of parts to be more particularly hereinafter set forth and claimed. I Briefly stated this invention comprises an aerial composed of continuous coils of wire suitably spaced and wound on insulators projecting from a frame, the frame being composed of bowed members rigidly braced by said insulators.

Referring more particularly to the accompanying drawings in which corresponding parts are indicated by similar reference characters: I

Figure 1 represents a front elevation showing the assembled aerial.

Figure 2 is a left side elevation of the assembled aerial showing only that portion of the conductors seen on the left side of the frame in Fig. 1.

Figure 3 is a right side elevation of the a sembled aerial showing only that portion of the conductors shown on the right side of the frame in Fig. 1.

Figure 4 shows a fragmentary portion of one of the insulators.

Familiar types of loop or coil aerials are usually of extremely delicate construction since they are designed principally for indoor use. Many of the folding type having exceedingly light frames on which the conductor coils are wound. Those which are built for outdoor use are usually of awkward con struction and inefficiently wound for non directionalreception.

It is thereforethe aim and purpose of this invention to provide a coil aerial designed primarily for outdoor use and which is of entremely sturdy construction, yet compact 1n form, and strung or wound in a manner to adapt it for the most efficient reception of terminals 22 similar to radio frequency oscillations regardless of the direction of their point of emanation.

In describing the details of construction which have been adapted for the purpose of lllustration the frame will be first considered. Referring to Figure 1, the numeral 10 designates a stanchion which is split and bowed in- Wardly at its upper portion, as shown more clearly at 11 and 12 in Figures 2 and 3.

The lower or undivided portion 10 of this stanchion 10 is of sufficient length to permit the same to be fastened to any available gable, chimney, or roof cornice. The bowed members 11 and 12 of the stanchion 10 are connected and rigidly braced by the rods 13 F lgure i), composed of insulating material, and which are fitted into holes drilled oppo site to each other in the concaved bows.

The tie rods 13 are formed with a shoulder i l at each end, the purposes of which is to abut the opposite bows to assure their proper separation. The portion of the tie rod which is of smallerdiameter, as shown at 15 is preferably threaded for the reception of internally threaded insulator terminals 16 which are screwed thereon and which serve to prevent the bowed members from spreading as well as to serve as guides for the conductor windings.

The insulator terminals 16 are preferably cylindrical in form having a central annular groove therein, as shown at 17. and which is of sufficient width and depth to accommodate the conductor.

Centrally located between the bowed support members 11 and 12 are another pair of support members 19 and 20 which are also bowed inwardly toward each other and braced by the tie rods similar to 13, having screwed terminals 16 described above.

The inner pair of support members 19 and 20 are located concentrically with and at right angles to the outer support members 11 and The construction described gives a cross frame having projecting terminals for the support of the conductor windings which for convenience of illustration will be started on the rear of the frame as shown in Figure 1, altho either side would be suitable. Starting from the rear side at the terminal 30 diagonally to the opposite side of the frame and then makes a complete revolution on the terminals 31, 32, 33 and 30, which are directly opposite terminals 31, 32, 33 and. 30 being connected at opposite ends of the tie rods 13. On reaching the terminal 30 the conductor is strung diagonally across the frame to terminal 41 which is one of the next group of four terminals, namely 41,42,43 and 40, adjacent tothose on which the conductor has already been wrapped. From the terminal 41 the conductor is brought to terminals 42, 43 and 40 whence it again crosses the frame diagonally to terminals All and from there it is looped about 42, 43 and 40. On reaching terminal 40 the conductor is again strung diagonally across the frame to terminal 51, and so on the conductor is wound about groups of terminals first on one side of the frame and then on the other until the desired number of coils for proper reception is reached. The unwrapped end 56 of the conductor is connected to the aerial terminal of a receiving set.

Besides use as the ordinary antenna which acts primarily as an electrical condenser, the absorptive power of which depends on its capacity,the improved aerial may be also used as a loop antenna which acts primarily as an electrical inductance. The preference in use being accomplished by connecting either one end or both of the coil windings to the antenna terminal or to the loop terminals of the receiver, depending on whether said receiver be the type adapted for antenna or loop reception.

In the aerial just described it will be noted that successive coils are placed in planes parallel to but spaced at increasing distances from the central axis, and that after each revolution of the conductor it passes from one side of the loop to the other thus arranging a series of cross wires in planes diagonal to those of the loops, distributing the conductor leads in several places, and thus increasing the ability of the aerial to pick up the oncoming waves.

This improved aerial not only provides a frame of exceedingly sturdy construction, but one in which the distribution of the leads provides a more etlicient detector.

Altho in the foregoing, certain elements have been described as best adapted to perform the functions allotted them, nevertheless it is to be understood that various minor changes may be resorted to within the scope of the appended claims without departing from or sacrificing any of the principles of the invention.

Having described this invention, what is claimed as new and is desired to secure by Letters Patent is 1. In an aerial, a frame comprising adjacent inwardly bowed cross members, insulatorsv carried by said cross members and projecting from either side thereof, and a conductor supported by said insulators and arranged in a plurality of continuous loops wound alternately on either side of said cross members.

2. In an aerial, a frame, comprising adjacent inwardly bowed cross members arranged concentrically and at right angles to each other, and a conductor supported by said cross members and arranged in a plurality of continuous loops wound alternately on either side thereof.

3. In an aerial, a frame comprising adjacent inwardly bowed cross members, arranged coneentrically at right angles to each other, means comprising insulated tie rods for bracing said cross members, and additional means comprising insulated terminals attached to the ends of said tie rods for sup porting a conductor wound on said terminals in a series of continuous coils alternately on either side of said frame.

t. In an aerial, a frame comprising a stanchion inwardly bowed at its upper end, and a second inwardly bowed supporting member .iounted at right angles within the bowed portion of said stanchion, and concentric with the bowed portion thereof, and a conductor supported by said inwardly bowed members and arranged in a plurality of continuous coils wound alternately on either side thereof.

5. In an aerial, a frame comprising a stanchion inwardly bowed at its upper end, and a second inwardly bowed supporting member mounted at right angles within the bowed portion of said stanchion, and concentric with the bowed portion thereof, tie rods bracing said bowed members and a conductor sup ported by said inwardly bowed members and arranged in a plurality of continuous coils wound alternately on either side thereof.

6. In an aerial, a frame comprising a stanchion inwardly bowed at its upper end, and a second inwardly bowed supporting member mounted at rightangles within the bowed portion of said stanchion, and concentric therewith, tie rot s bracing said bowed members, insulator terminals mounted at either end of said tie rods, and a conductor supported on said insulator terminals and arranged in a plurality of continuous coils wound alternately on either side thereof.

7. In an aerial, a frame comprising a stanchion inwardly bowed at its upper end, and a second inwardly bowed supporting member mounted at right angles within the bowed portion of said stanchion and concentric therewith, insulated tie rods bracing said bowed members, insulator terminals mounted at each end of said tie rods, and projecting outwardly from said bowed members, and a conductor supported on said insulator ter minals and a ranged in a plurality of continuous coils wound alternately on either side of said frame.

8. In an aerial, a frame comprising a stanand arranged in a series of continuously 10 wound loops of increasing circumference, the conductor passing alternately from one side of the frame to the other at the completion of each loop.

In testimony whereof I have aflixed my 15 signature.

PAUL D. MORRIS.

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