US2429653A - Antenna mounting system - Google Patents

Description

oppzs, 1947. E. R. TOURATON 2,429,653

. ANTENNA MOUNTING SYSTEM Filed June 6, 1941 I INVENTOR.-

lemwawranr ATTORNE:

Patented Oct. 28, 1947 ANTENNA MOUNTING SYSTEM Emile R. Touraton, Lyon,

Standard Electric Corporation, Y., a corporation of Delaware International New York, N.

France, assignor to Application June 6, 1941, Serial No. 396,949 In France March 1, 1940 Claims.

The present invention relates to antenna supporting systems and has for its principal object the avoiding of harmful effects in radiating systems and their supports.

It has been found that, in the case of powerful transmitting stations, harmful effects may be encountered in the antenna supports, even in supports of insulating material, and that, in particular, wood members disposed in the immediate vicinity of the radiating elements may be scorched, particularly in their central portion, and even sometimes catch fire.

The present invention contemplates principally antenna support means or antennas disposed substantially in a plane in which the harmful effect of the radiating field on the support is substantially reduced.

The intersection of this plane with that of the antenna is made to occur in a vicinity of the antenna in which voltage is a minimum. Excitation of the cable supported insulators carrying the antenna elements is made practically negligible by interposing insulators dividing the supporting cables into sections, the lengths of which are anti-resonant to the operating frequency.

In an application of the invention to an antena comprising elements regularly spaced along a central feeding line, the elements comprising the antennas are stretched between two supporting wires carried by a frame, the location of which is adjustable on the pylon carrying the antenna, the antenna elements being secured to these supporting wires at points where the potential is practically zero.

An embodiment of the invention will be disclOsed with reference to the drawings included herewith in which Fig. 1 represents a front elevation of a pylon carrying an antenna system at its mid-section;

Fig. 2 represents a side elevation of apparatus of Fig. 1;

Fig. 3 represents a cross-sectional view of Fig. 1.

Fig. 4 represents a detail of the embodiment.

Referring to Figs. 1 and 3, numeral 30 represents a pylon or tower of wood, for example. The antenna system comprises three sets of elements formed by the members l-l', 3-3, 55' and three sets of reflectors 2-2, 4-4 and B6'.

The antenna elements for example, are supported at points 1'| by an arrangement of insulators and members or cables, a possible embodiment of which is shown in the drawings. These points 1'l are chosen to be those at which the potential is a, minimum. In that way, the

cable supporting system and the insulators carried thereby are located in a plane in which the electric field is practically zero. Similarly, it may be seen from Fig. 1 that the legs of the wooden tower may be kept protected in regions where the electric field is great.

The disclosed apparatus comprises insulators 10- and members or wires l2-I3 fixed to a cable l4 atone end and to a cable l5 at the other. This arrangement constitutes a catenary-type system. The cables l4 and t5 are fixed at their ends |8-20 and I 92| to the frames 22 and 23.

The above-described method of support allows the antenna elements to be disposed for easy adjustment as to length without requiring the catenary system to be taken down or changed. Grooved tubes may, for example, easily be used for antennas.

The reflector systems are held in place by similar arrangements fastened to the same frames 22 and 23 and they are held appropriately spaced by members or cables 21 of adjustable length.

The frames 22 and 23 are provided with displaceable means so as to compensate if need be for deformation of the support 30, shown in the drawing in the form of a wooden tower.

The cables l4, l5, etc, are sectioned from point to point by means of insulators 25 in order to avoid formation of circuits that may resonate electrically.

To this end, they are divided into lengths substantially equal to a quarter wavelength. These sections have a slight impedance and the reactance of the insulator to high-frequency currents is very great; because of its slight capacity, a capacitative excitation of the support sections is reduced to a. minimum, and even more so since the applied potential is very weak due to the choice of the connection point.

The feeding line is represented at 26 and its connection to the radiating system is made in accordance with the antenna arrangement to be employed.

Resilient spring means 24 are provided to keep the cables l4, l5, taut. Fig. 4 represents a possible embodiment of such spring means, which may be of any convenient type.

The described apparatus exhibits electrical, as well as mechanical advantages, as have been indicated above. In particular, the fact that no portion of the supporting apparatus is excited either by capacity coupling or radiation will assure that the radiation diagram of the antenna is not affected and that, moreover, no vertical polarization is set up by the apparatus.

plane in which it is least The supporting unit has geometrical dimension other than the support deformations absorbed by the spring system.

Operation is thus as stable as the radiation diagram. Moreover, the effect of wind on the antenna system is a maximum in the plane of the catenary arrangement, that is to say, in the subject to deformation.

Although the invention has been described with respect to the embodiments shown, it is clear that it is not limited only thereto but that it is susceptible to numerous modifications and uses without departing from its scope.

What is claimed:

1. An antenna mounting system for mounting a vertical array of antenna elements and refiector elements comprising an insulating supporting structure, antenna supporting cables fastened at their opposite ends to the top and bottom of said structure, antenna elements vertically spaced one above the other and fastened to certain of said supporting cables at the voltage nodal points of said antenna elements, reflector elements spaced vertically the same distance as said antenna elements supported at their voltage nodal points by others of said cables, and tied means equal in length to the desired spacing between the antenna elements and corresponding reflector elements fastened to the respective antenna elements and reflector elements to maintain proper spaced relation thereof.

2. An antenna mounting system according to claim 1, further comprising spaced insulating means in said cables for reducing radiation effects of said cables.

3. Antenna supporting structure according to claim 1, further comprising resilient means in each of said cables for maintaining the tension thereof.

4. An .antenna supporting structure comprising a supporting tower, antenna units comprising aligned radiant acting sections, a first pair of supporting cables fastened to said tower and spaced apart a distance to coincide With the voltage nodal points of said aligned sections, a second pair of supporting cables spaced apart the same distance as said first pair of cables, a plurality of refllector units comprising aligned radiant acting sections, means for mounting said antenna units and reflector units at corresponding spaced points to said first pair and said second pair, respectively, of said cables to provide vertical antenna and reflectory array, and tie means of fixed lengths for holding said corresponding antenna and reflector units in the desired spaced relationship.

5. An antenna supporting structure according to claim 4, further comprising spaced insulating means in each of said cables to break them electrically into short lengths, and resilient means in each said cable to maintain the proper tension of said cables.

E. R. TOURATON.

EEFEEENCES CETED The following references are of record in the file of this patent:

UNITED STATEE PATEWTS Number Name Date 2,210,491 Lewis Aug. 6, 1940 2,197,051 Lindenblad Apr. 16, 1940 2,183,784 Carter Dec. 19, 1939 2,149,333 Brown Mar. 7, 1939 1,869,192 Franklin July 26, 1932 2,229,733 Goldmann Jan. 28, 1941 2,014,785 schuler Sept. 17, 1935 1,963,014 Brown June 12, 1934 FOREIGN PATENTS Number Country Date 457,930 Great Britain Dec. 8, 1936

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