US1823794A - Wireless transmission system - Google Patents

Wireless transmission system Download PDF

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Publication number
US1823794A
US1823794A US228528A US22852827A US1823794A US 1823794 A US1823794 A US 1823794A US 228528 A US228528 A US 228528A US 22852827 A US22852827 A US 22852827A US 1823794 A US1823794 A US 1823794A
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Prior art keywords
waves
polarization
horizontal
transmitting
transmission system
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US228528A
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English (en)
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Esau Abraham
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • the present invention relates to radio transmission systems and has for its object the elimination of disturbances which operate between the transmitting and receiving 5 stations to affect the energy radiated and is especially intended for the use of short waves.
  • the reception of wireless waves is exposed to more or less pronounced disturbances such as atmospheric disturbances, as well as to fluctuations of intensity which are generally referred to as fading, and also todisturbances produced by other transmitters etc.
  • Mean-s has already been suggested for the elimination of such disturbances, for instance the use of directional aerials, or of special reception connections employing trap or rejector circuits, etc.
  • the object of the present invention is to render the reception of wireless signals independent to the greatest possible extent of the influence of the above mentioned disturbances which may sometimes completely stop practical working, and the invention utilizes for the purpose a special property of wire less waves, namely, that their plane of polar ization may change naturally or may be changed artificially, and that it is possible to construct transmitting or receiving apparatus adapted to radiate or to receive predominantly waves of a given polarization.
  • the invention consists in the reception of the Waves, which always have a definite polarization whether intentionally given to them at the transmitting station or assumed during transmission through the intervening medium, by a receiving apparatus which responds chiefly to the same polarization as that of the incoming waves to be received, so that all waves otherwise polarized are for the most part eliminated, and only waves with the desired polarization, ensuring freedom from disturbances, become operative in the receiver.
  • such a disturbance may be overcome by the use of receiving apparatus adapted to receive chiefly horizontally polarized waves, such as, for instance, a horizontal di-pole orv a horizontal frame, which accordingly presupposes that the working waves radiated by the transmitting station, arrive at the receiving station with horizontal polarization; this can be attained by the use of a transmitterradiating horizontally polarized waves, or in the event of rotation of the plane of polarization taking place during the transmission, by giving the waves at the transmitting stat'ion, bythe use for instance, of a dipole arranged at an angle, such a polarization that at the receiving station they impinge against the receiver with the desired horizontal polarization, so exercising the maximum efiect on the receiver; 7
  • a further possibility of the invention lies the provision of a new means of selective transmission.
  • two or more waves o-fthe same wave length, but ofdiflerent polarization for instance one horizontally and the other vertically polarized or both horizontally polarized to different degrees, i. e., one strictly horizontal and the other at a. small angle to the horizontal, or both at different small angles to the horizontal, might be used for the transmission of two difi'erent signals which are then received at the receiving station by apparatus which are particularly adapted respectively to receive waves of the corresponding polarization and to coordinate such waves;
  • the horizontal plane of polarization at the transmitter or also at the receiver or at both may bevariable, for instance by the use ota rotatable dipole, frame or the like in order that constant adaptation tothe most favourable adjustment or setting may be possible and waves produced and coordinately received which by horizontal polarization and separately retheir changing character will be difficult if not impossible of reception by third parties unfamiliar with the key or polarization changes.
  • apparatus well known in itself and suitable for the selective radiation or reception of waves of given polarization may be employed such as open aerials (di-poles) and loops or any other aerial combination suitable for the purpose. 7
  • the accompanying drawing shows diagrammatically an example of co -operating aerials suitable for carrying out the invention.
  • a transmitting aerial for example a dipole a1, a2 is arranged for the radiation of horizontally polarized waves,being preferably rotatably mounted whilst at the receiving station E a horizontal frame 1', chiefly responding to horizontally polarized waves and rejecting to the greatest possible extent the normally vertically polarized atmospheric disturbances, is used.
  • the terminals Z) are intended for connection of the transmitting apparatus and the terminals 0 for connection to the receiver.
  • a loop could be used, or at E a di-pole or a loop, or a di-pole at each of the stations, or, as already stated, any aerial arrangement well known in itself and suitable for the radiation or the reception of waves of given polarization.
  • the waves radiated from S can be initially given, by turning the di-pole a1, a2, such a polarization that the change produced by the intervening medium will be balanced, and the waves will arrive at the receiving station E with the desired horizontal polarization producing the maximum excitation of the receiver.
  • waves of variable horizontal polarization or waves of different angles of horizontal polarization
  • I mean waves which are strictly horizontal or waves which are substantially horizontal, i. e., waves which may vary within certain degrees from or lie at small angles to the horizontal, ordinarily from five degrees to ten degrees, or even more under some conditions; as an example, in a two-degree polarization change and reception action one of the waves may be strictly horizontal or vary but a fewdegrees therefrom, while the other may vary ten degrees or more from the horizontal, so long as a. substantially? horizontal wave polarization is preserved.
  • the method of transmitting and receiving radio signals which consists in separately and simultaneously transmitting a plurality of signals of the same wave length by differently polarized waves of predetermined known substantially horizontal polarization and separately receiving and coordinating such waves.
  • the method of transmitting and receiving radio signals which consists in transmitting waves of substantially horizontal polarization and shifting the polarization according to a definite prearranged schedule and correspondingly shifting the receptive antenna to receivesuch waves.
  • the method of transmitting and receiving radio waves which consists in separately and simultaneously transmitting a plurality of signals on the same wave length by differently polarized waves of predetermined known polarization and shifting the polarization of any or all of said waves according to a previously arranged schedule and correspondingly shifting the receptive antennae to receive and coordinate such waves.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US228528A 1926-10-29 1927-10-25 Wireless transmission system Expired - Lifetime US1823794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1823794X 1926-10-29

Publications (1)

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US1823794A true US1823794A (en) 1931-09-15

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US228528A Expired - Lifetime US1823794A (en) 1926-10-29 1927-10-25 Wireless transmission system

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US (1) US1823794A (fr)
FR (1) FR643193A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460326A (en) * 1945-02-17 1949-02-01 Clarence M Woodruff Transmitter
US2483790A (en) * 1945-11-27 1949-10-04 Rca Corp Radio beacon
US4313208A (en) * 1979-10-09 1982-01-26 Bell & Howell Company Methods and apparatus for transmitting electromagnetic radiation for illumination and communication
US6553239B1 (en) 1995-06-07 2003-04-22 Cisco Technology, Inc. Low power, short range point-to-multipoint communications system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460326A (en) * 1945-02-17 1949-02-01 Clarence M Woodruff Transmitter
US2483790A (en) * 1945-11-27 1949-10-04 Rca Corp Radio beacon
US4313208A (en) * 1979-10-09 1982-01-26 Bell & Howell Company Methods and apparatus for transmitting electromagnetic radiation for illumination and communication
US6553239B1 (en) 1995-06-07 2003-04-22 Cisco Technology, Inc. Low power, short range point-to-multipoint communications system

Also Published As

Publication number Publication date
FR643193A (fr) 1928-09-11

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