DE537314C - Loop antenna with a frame-shaped, insulating housing - Google Patents

Description

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It is known that the windings of loop antennas with unprotected windings often damaged or changed in shape during shipping or use.

Attempts to eliminate this drawback have resulted in the use of a lot elastic wire that changes its shape little. The usually braided, silk-spun and not However, enameled wire is very expensive and not suitable for transmitting electrical power to recommend.

Since the beginning of radio transmission, attempts have been made to use the frame windings To protect substances such as stuff, paper, wood, metal, etc. These substances will on the frame of the wires either directly or with the interposition of

so insulating washers attached to the frame.

In general, all of these arrangements provide sufficient protection for the Wires, on the other hand, have the disadvantage that they are difficult to manufacture and are relatively expensive for a certain strength, because that is always the wires The supporting frame and the fabrics protecting it form two different parts as a result, can perform mutual movements. Because the two components Known frames cannot be completely firmly connected to one another, everyone must of them get a larger cross-section than if both parts form a block would.

The wood used in the construction of most loop antennas has the disadvantage that to shrink over time, causing a relaxation of the wires and a throwing of the Framework becomes inevitable.

The cast insulating material seems to be best for building loop antennas too However, its exclusive use for this purpose is, on the one hand, a Support frame, on the other hand, the encapsulation were required, both of the high weight as well as the high costs.

The invention now aims to obviate the various disadvantages mentioned above and to provide a loop antenna with a frame-shaped insulating housing, which is characterized in that this housing consists of cast insulating material and has the shape of a hollow body longitudinally slotted in the plane of the frame, the both halves are designed the same and in the cavity enclosed by them the Frame windings included.

The wire windings are made of insulating

the cross bars provided with guide grooves carried inside the two Housing parts are arranged.

In the drawings, the subject matter of the invention is shown, for example, and it demonstrate

Fig. Ι a view of a loop antenna according to the invention,

Fig. 2 and 3 cross-sections along line 2-2 and 3-3 of Fig. 1,

Fig. 4 is a view of an outer frame and

Fig. 5 is a view of an inner frame. The loop antenna shown consists of an outer frame 1 and an inner frame 2, one of which is intended, for example, to receive short waves, the other to receive long waves. According to the invention, these frames each consist of two housings i ¹ , i ² or 2 ¹ , 2 ² of U-shaped cross-section, which abut one another with their flanges. The frame having the shape of a regular octagon in the illustrated embodiment can instead also assume the usual shape of a circle, an oval or a regular or irregular polygon with any number of sides and sharp or rounded corners. They can of course be provided with open or closed viewing openings with a transparent material, or they can be made entirely of a translucent, cast insulating material.

The advantage of such a housing that represents both a frame and a protective encapsulation compared to known arrangements is obvious.

The material forming the frame in the usual encapsulated frame is located here at the circumference, and the moment of inertia of the frame cross-section is as a result large, so that the housing is particularly rigid and strong for a given weight. By this housing will further protect the wires. An encapsulated frame can do so are formed by two castings of low thickness, which with the help of a single Shape can be made.

The wires 3 and 4 are wound onto cross bars 5 with guide grooves 6. The cross bars lie in grooves y ¹ , y ^{2 of} each of the housings i \ i ² or 2 ¹ , 2 ² .

The two frames 1 and 2 are arranged to be rotatable relative to one another. For this purpose, the inner frame 2 has two pivot pins ι ο ¹ , ι o ² , which are mounted in corresponding bearings 11 ¹ , 11 ^{2 of} the frame 1. This arrangement enables the frame 2 to be rotated at right angles to the frame 1. It is known that only in the right-angled position of the planes of two concentric windings there is no mutual inductive influence. The rotatable arrangement of the frame 2 with respect to the frame 1 has the advantage of less space requirement in the position in which the planes of the two frames coincide. Electrically, this position enables the two windings to be connected in series at the same time, if desired.

Since only the two positions of the frame to one another, in which their planes coincide or form a right angle, are of importance, is a simple one, for example an adjustment device consisting of springs 12 is provided to as desired to hold frames 1 and 2 in one position or the other. The adjustment device is conveniently used to make any desired connection, either between the windings themselves or between the windings of the inner housing and the drain wires of the frame which cross through the housing of the outer frame.

For the purpose of drawing current from the frame, 14 rings 13 ¹ , 13 ² , 13 ³ ... are provided on an insulating cylinder, of which the rings 13 ¹ , 13 ^{4 are connected} directly to the windings of the outer frame and the rings 13 ² , 13 ³ are electrically connected to the windings of the inner frame by the two spring blades 12. The spring lamellae 12 rest against square brass clamps 15 and thereby hold the two frames 1 and 2 in one or the other working position specified above, as desired.

In the working position, the planes of the frames form a right angle, and any change in the wavelength range is intentional outside of the real one Framework and preferably at the receiving point, where they are easily done at the same time as another can.

The wires 3 and 4 can be attached by ^{temporarily bringing two housing halves i 1} , i ² and 2 ¹ , 2 ² opposite one another by means of a rotating device and approaching them so far that the ends of each transverse rod 5 are in the front part of the grooves 7 ¹ , 7 ² rest, while the distance between the two housing halves i ¹ , i ² and 2 ¹ , 2 ^{2 is} so great that, when the whole thing is rotated, the wire winds up on the cross bars 5 at the bottom of the grooves 6 through which the position of the wire is secured 3 or 4 turn by turn.

If several layers of wire are required, a different crossbar is used before each new layer placed with grooves on each of the first and temporarily held in a suitable manner. The necessary connections

Claims (6)

are then made at each end of the winding, and the two housing halves i ¹ , i ² and 2 ¹ , 2 ² are brought together such that each insulating crossbar S assumes its final position in its bearing y ¹ , 7 ² . The two housing halves are expediently pressed together and finally fastened by screws screwed into the insulating rods 5, which also serve as cross braces. The use of such a housing over the known, possibly as has weak receiving frames serving induction coil housings, induction coils following advantages. With the induction coils enclosed in housings, the wires become reality not held by the housing. The wires are either messed up or in the form of honeycomb coils, basket bottom coils, Wound like a bulwark (gabions), etc., with the windings repeatedly touching points, either with each other or with little insulating materials, so that a heavily insulated wire can be used got to. Furthermore, the poorly held windings tend to move back and forth fluctuate and change their shape inside the housing. This increases with the increase in the dimensions of the housing Dimensions occurring disadvantages have hitherto prevented housing of such dimensions build loop antennas that are satisfactory in all respects. In contrast, the wires 3 and 4 are in the housings according to the invention aligned in the manner described and stretched over cross bars provided with grooves 6, so that they can never mess with each other. This results in the possibility to use bare or very lightly enamelled wire and to achieve windings, which are more constant and have a smaller capacity, with a diameter can be achieved in the desired and sufficient size for a good loop antenna can., The connection and use of the wire windings can be of various types. Some of the windings can be used to receive a certain wavelength range another part for another area. One provided in a simple manner on the frame or inside it Switch can be used to switch all or part of the windings in series, in parallel or in series in parallel, to short-circuit a certain number of turns or remove them from the circuit or to switch on one or more fixed or variable capacitors located outside or inside the housing for the purpose of encompassing the desired wavelength ranges. This switch can operated by rotating one frame relative to the other. Pa τ ε ν τ λ ν s ι · R ν c li ίο: ι. Loop antenna with a frame-shaped, insulating housing, characterized in that this housing (i ¹ , i ² ) consists of cast insulating material and has the shape of a hollow body longitudinally slotted in the plane of the frame, the two halves of which are identical and in the cavity enclosed by them contain the frame turns (3, 4). 2. Loop antenna according to claim 1, characterized in that with guide grooves (6) provided cross bars (5) in the interior of the housing (i ¹ , i ² ) are arranged, which carry and guide the wire windings (3, 4). 3. Loop antenna according to claim 2, characterized in that the transverse rods (5) are inserted into each of the two housing parts (i ¹ , i ² ) arranged grooves (7 ¹ , γ ") and form transverse struts. 4. loop antenna according to claim 1 to 3, characterized in that the antenna zw ^r ei frame passes, of which one lies inside the other, and the planes of the two frames are arranged perpendicular to each other '. 5. loop antenna according to claim 4, characterized in that the two Frame (1, 2) are provided with a rotating and adjusting device through which the inner frame (2) perpendicular to the outer frame (1) or in the same Level how this can be set and held in this position. 6. Loop antenna according to claim 5, characterized in that the rotating and locking ^{device (io 1} , io ² ) is provided with organs for the positive control of the electrical connections required for the respective frame position. no 1 sheet of drawings