US3017632A - Aerials for receiving television and modulated frequency broadcast signals - Google Patents

Aerials for receiving television and modulated frequency broadcast signals Download PDF

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Publication number
US3017632A
US3017632A US707570A US70757058A US3017632A US 3017632 A US3017632 A US 3017632A US 707570 A US707570 A US 707570A US 70757058 A US70757058 A US 70757058A US 3017632 A US3017632 A US 3017632A
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Prior art keywords
stay
aerial
dipole
aerials
elements
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US707570A
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English (en)
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Josep Gustave Jean Henri
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
    • H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

Definitions

  • Jib- 11- 2 4* United States Patent 3,017,632 AERIALS FOR RECEIVING TELEVISION AND 1lzlolOsULATED FREQUENCY BROADCAST SIG- My invention has for its object improvements in aerials for receiving television and modulated frequency broadcast signals, said improvements providing: the cutting out of certain losses and consequently a larger gain; a modification in the radiating diagram, in particular so as to provide a large improvement in the front to back ratio; an increase in the breadth of the range of frequencies for which the aerials may operate satisfactorily; a shortening of the aerials; the possibility of operating the aerials so as to receive broadcast signals.
  • a three-element television aerial includes chiefly a mast at the upper end of which is secured the medial portion of a stay, one of which carries a reflector and the other a dipole and a director.
  • the electrical middle point is not necessarily coincident with the 3,017,632 Patented Jan. 16, 1962 "ice mechanical middle point, the latter being grounded.
  • the different losses of power are not the sole drawbacks produced by a lack of electrical equilibrium and there should also be mentioned an important modification in the radiation diagram which modification is easily checked through a reversal of the input connections for the receiver, so that the diagram is deformed either in one direction or in the other, according to the direction of the connection of the twin cable.
  • insulating stays provided according to my invention, said insulating stays having a leakage line which is sufiiciently long so that it may retain excellent insulating properties even for very inclement weather conditions.
  • Materials which have provided good results upon testing i.e. elements which are not wettable are constituted for instance by polystyrene, Teflon and vitrified polyester resins.
  • a further feature of the insulated stay consists in the shortening of said stay, this being due to the fact that the coupling of the difierent elements of a television aerial, to wit the dipoles, the reflectors, and the directors is obtained chiefly through induction and also, for a fraction of the energy, through capacity.
  • the insulating stay reduces considerably the capacity and this may be compared with a spacing of the elements. In order to restore the original coupling, it is therefore necessary to bring the elements of the aerial nearer one another and this is important in practice since the elements are fitted laterally of the axis of the mast and are subjected to the action of the wind.
  • An unexpected and important feature of the invention provided through the proposed modification of the stay resides in the possibility of operating the television aerial as an excellent broadcast aerial having a terminal capacity.
  • the mast Since the mast is brought through its actual arrangement to ground potential either through a direct cable connection provided for this purpose or through the unavoidable losses, said capacity between the dipole and the ground forms a direct channel for the losses of the signal energy collected by the dipole.
  • I may just suggest some physical hypotheses which may explain to some extent the phenomenon in a qualitative manner.
  • a fraction of the useful incoming waves is reflected by some section of the metal stay instead of being absorbed by the dipoles, directors or reflectors and this leads to a loss.
  • Another loss could be due to the fact that a fraction of the reflected energy is sent back towards the operative elements of the aerial with a phase-difference with the direct incoming waves, so that the said fraction of the reflected energy is subtracted from the latter instead of reinforcing same.
  • the aerial is provided with an insulating stay, this allows selecting without any difficulty the direct waves and this is all the easier since the waves reflected on any structure, waves which it is desired to cut out, assume generally speaking, vertical polarisation which distinguishes them in all cases from the original horizontal polarisation with which they have been transmitted.
  • the stay 1 is made of insulating material and its leakage line is sufficiently long for retaining excellent insulating properties even for very inclement weather conditions.
  • Said stay is secured to the upper end of the mast 2 and carries the dipole 3 together with the directors 4 and reflector 5; obviously any other arrangement of these or similar parts may be provided on the stay 1.
  • A incorporated an insulated dipole and a metal stay of the three-element category for channels 8, 9, 10 and a further aerial designated by B with an insulating stay according to my invention wherein the distance from the dipole to the reflector is equal to 38.7 cm., that from the dipole to the director is 13.5 cm. while the reflector has a length of 72.6 cm., the director a length of 63.8 cm. and the dipole a length of 68.5 cm.
  • the calculation of the average gain of the aerial B with reference to A can be obtained as follows: Average voltage received by the aerial A:
  • the absolute average gain of the aerial B is thus equal to whereas for the aerial A, it is equal to i.e. +5.3 db.
  • the gain is equal to about an average of 2 db over the result obtained with the aerials presently sold in trade.
  • An aerial chiefly for television and frequency modulated broadcast waves comprising, a mast; a transverse stay carried by said mast and consisting of polyester material; and a plurality of aerial elements mounted on said stay and comprising at least one dipole, at least one reflector and at least one director, all said elements extending transversely of said stay, said reflector and said director being spaced in opposite directions from said dipole distances related to the wave length to be received, whereby said stay is effective to prevent leakage between the antenna elements, and to prevent reflection of said waves from said stay toward said aerial elements, for providing a relative optimum in directional gain, in front to back ratio, and in band width.
  • An aerial chiefly for television and frequency modulated broadcast waves comprising, a mast; a transverse stay carried by said mast and consisting of polyester material and said material having water repellent surface characteristics; and a plurality of aerial elements mounted on said stay, comprising at least one dipole, at least one reflector and at least one director, all said elements extending transversely of said stay, said reflector and said director being spaced in opposite directions from said dipole distances related to the wave length to be reoeived, whereby said stay is effective to prevent leakage between the antenna elements, and to prevent reflection of said waves from said stay toward said aerial elements, for providing a relative optimum in directional gain, in front to back ratio, and in band width.
  • An aerial chiefly for television and frequency modulated broadcast waves comprising, a mast; a transverse stay carried by said mast and consisting of polyester material; a plurality of aerial elements mounted on said stay, comprising at least one dipole, at least one reflector and at least one director, all said elements extending transversely of said stay, said reflector and said director being spaced in opposite directions from said dipole distances related to the wave length to be received, whereby said stay is effective to prevent leakage between the antenna elements, and to prevent reflection of said waves from said stay toward said aerial elements, for providing a relative optimum in directional gain, in front to back ratio, and in band width; and means attaching said stay to said mast at a point of zero ground potential located in spaced relation between two of said aerial elements.
  • An aerial chiefly for television and frequency modulated broadcast waves comprising, a mast; a transverse stay carried by said mast and consisting of polyester material; a plurality of aerial elements mounted on said stay, comprising at least one dipole and at least one reflector, all said elements extending transversely of said stay, said reflector being spaced from said dipole a distance related to the wave length, whereby said stay is effective to prevent leakage between the antenna elements, and to prevent reflection of said waves from said stay toward said aerial elements, for providing a relative optimum in directional gain, in front to back ratio, and in band width.
  • An aerial chiefly for television and frequency modulated broadcast waves comprising, a mast; a transverse stay carried by said mast and consisting of polyester material; a plurality of aerial elements mounted on said stay, comprising at least one dipole and at least one reflector, all said elements extending transversely of said stay, said reflector being spaced from said dipole a distance related to the wave length, whereby said stay is effective to prevent leakage between the antenna elements, and to prevent reflection of said waves from said stay toward said aerial elements, for providing a relative optimum in directional gain, in front to back ratio, and in band width; and means attaching said stay to said mast at a point of zero ground potential located in spaced relation between two of said aerial elements.

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  • Aerials With Secondary Devices (AREA)
US707570A 1957-06-07 1958-01-07 Aerials for receiving television and modulated frequency broadcast signals Expired - Lifetime US3017632A (en)

Applications Claiming Priority (1)

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BE3017632X 1957-06-07

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US3017632A true US3017632A (en) 1962-01-16

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US707570A Expired - Lifetime US3017632A (en) 1957-06-07 1958-01-07 Aerials for receiving television and modulated frequency broadcast signals

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BE (1) BE558206A (da)
LU (1) LU35213A1 (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3308471A (en) * 1963-03-18 1967-03-07 David C Weston Indoor aerial mounted on floor-toceiling standard
US6348899B1 (en) 2000-05-24 2002-02-19 David M. Bergstein Antenna mast adapter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2213276A (en) * 1938-05-25 1940-09-03 Lorenz C Ag Directional antenna system
US2486872A (en) * 1946-03-04 1949-11-01 Paul H Parker Receiving antenna
US2523531A (en) * 1949-08-08 1950-09-26 James A Flippen Antenna
US2582634A (en) * 1950-01-03 1952-01-15 Philco Corp Television antenna assembly
US2589174A (en) * 1948-11-01 1952-03-11 John J Wargo Television antenna
US2619596A (en) * 1948-11-12 1952-11-25 Kolster Muriel Multiband antenna system
US2661423A (en) * 1953-04-27 1953-12-01 Marvin P Middlemark Multidirectional antenna with included reflector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2213276A (en) * 1938-05-25 1940-09-03 Lorenz C Ag Directional antenna system
US2486872A (en) * 1946-03-04 1949-11-01 Paul H Parker Receiving antenna
US2589174A (en) * 1948-11-01 1952-03-11 John J Wargo Television antenna
US2619596A (en) * 1948-11-12 1952-11-25 Kolster Muriel Multiband antenna system
US2523531A (en) * 1949-08-08 1950-09-26 James A Flippen Antenna
US2582634A (en) * 1950-01-03 1952-01-15 Philco Corp Television antenna assembly
US2661423A (en) * 1953-04-27 1953-12-01 Marvin P Middlemark Multidirectional antenna with included reflector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3308471A (en) * 1963-03-18 1967-03-07 David C Weston Indoor aerial mounted on floor-toceiling standard
US6348899B1 (en) 2000-05-24 2002-02-19 David M. Bergstein Antenna mast adapter

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BE558206A (da)
LU35213A1 (da)

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