US1708515A - Antenna - Google Patents

Description

April 9, 1929. A. MEISSNER ANTENNA Filed May l2, 1927 Pl/,455 IWI/57M@ Ali/M3 INVENTOR RM E.

Apr.. 9, i929,

@Nit-TEE STTS FTNT L'EXANEER MESSNER, OF ERLIN, GERMANY, SSGNOB, T0 TELEFUNKEN GESELL- SCHAF'J FR DRAHTLOSE TELEGRAPHLE M. B. H., BERLIN, GERMANY.

ANTENNA.

.application iledufayl 1 2, 192'?, Serial No.

The present invention relates to an antenna arrangement Which is particularly suited for short-Wave transmission and reception.

The invention consists in the employment of a long horizontal antenna, Whose length must he at least equal to one Wave-length, though it is preferable to choose the same substantially longer so that a relatively great number of half-Waves of the Working :trequency Will have a chance to arise along it. Now, according to the present invention, coils are inserted at intervals of a half-Wave length along the said antenna Wire, said coils being so dimensioned that the distribution ot current along them will also correspond to a half-Wave length. ln this Way, the different horizontal Wires Will be in phase compared With one another7 whereby in creased distant action of the Whole arrangement is insured.

rlhe specification is accompanied by a drawing in which Figure 1 represents an antenna embodying my invention; and

Figure 2 represents an antenna array according to my invention.

The coils inserted in the aerial Wire, as shown in the drawing, serve for phase re versal, and the entireantenna acts in the same way as a number of individual horizontal antennae excited in phase would act teiten together. Energy supply :may be effected, tor instance, at the central antenna Wire, as indicated. g

For the purpose of energy supply, desired, a distinct coil may additionally be connected in each of the respective portions of the horizontal antenna.

Under certain circumstances, it may he recommendable to combine a plurality ot such antenn to form an antenna system or array, as shown in Figure 2, in order to thus insure good directional characteristics tor space radiation. ln this case, it is necessary to excite all ot these antennae at the proper relative phase angles, in dependence upon the desired directive action.

The different horizontal antenna cornprised in such a system or antenna array as already described may also he harranged at dierent heights above ground, for this also exercises an influence upon the directive action.

ln accordance with the invention l may also provide the antenn with redection 190,697, and in Germany .Tune 28, 1926.

means. rihe reflector may have the lform of a parabolic mirror in Whose focal line the antenn are mounted. For the reflector any ot the different and lWell-known forms of construction may be used; for instance, it may consist of a continuous metallic mirror or else 1t may he formed of individual suitahly tuned Wires.

l An antenna arrangement of the hind herelnbetore described may also be employed t'or the reception as Well as transmission of electrical oscillations. i

l. claim:

l. horizontal antenna comprising a plurality of horizontal radiating and a plurality of substantially non-radiating reactances connected alternately in series, each having an electrical length of a half Wave.

2. A horizontal antenna comprising a plurality ot horizontal halt Wave length radiating wires located end to' end, 'and phase changing means connecting said Wires in series vvith a change in phase suiiicient to malte the radiation from said Wires co-phasal.

3. fr horizontal antenna comprising a plurality ot horizontal radiating Wires, each a half Wave in electrical length, located end to end, and an inductance a halt Wave in electrical length for connecting two of said radiating wires in series.

e. An antenna comprising lorg hori zontal Wire and a plurality ot poorly rad'ef ing reactors each a halt Wave in electr al length inserted in series with the Wire. and spaced an electrical half wave apart along the Wire.

n 'iorizontal antenna array including a urality of antennae each comprising a plul' of horizontal radiating Wires a half in electrical length connected in series nductances a half Wave in electrical l/ngth, and a feed circuit including nh e t' s l us ing means for interconnecting 6. n antenna array 'for obtaining directional transmission and reception ot short Waves including a plurality of spaced horizental antennae arranged physically in parallel, and connected electrically in parallel by feed circuits including phase changing means adjustable to obtain the desired directivity, each antenna comprising a plurality of hori zontal radiating Wires a halt Wave in electrical length, located end te' end, and con nected in series by inductances a halt wave in electrical length, whereby the radiators in each antenna radiate in phase, and the antenn radiate in a phase relation dependent on the dircctivity desired. r 7. An antenna array for obtaining directional transmission and rece ion of short Waves including a plurality of lhorizontally spaced antennae arranged physically in parallel and at'progressively increasing heights above ground, and connected electrically in v parallel by feed circuit-s including phase changing means adjusted to obtain the desired directivity, each antenna comprising a plurality of horizontal radiating Wires a half wave in electrical length, located end to end7 and connefgted in series by inductanccs a half Wave in electrical length, whereby lthe radiators in each antenna radiate in phase, and the antennae radiate in a phase relation dependent on the dir-ectivity desired.

ALEXANDER MEISSNFR.

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