US3611399A - Tilted element and tilted screen antenna - Google Patents

Tilted element and tilted screen antenna Download PDF

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Publication number
US3611399A
US3611399A US874743A US3611399DA US3611399A US 3611399 A US3611399 A US 3611399A US 874743 A US874743 A US 874743A US 3611399D A US3611399D A US 3611399DA US 3611399 A US3611399 A US 3611399A
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US
United States
Prior art keywords
antenna
radiator
ground plane
shaped
tilted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US874743A
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English (en)
Inventor
Arthur F Lyle Rocke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Micronas GmbH
ITT Inc
Original Assignee
Deutsche ITT Industries GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
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Publication of US3611399A publication Critical patent/US3611399A/en
Assigned to ITT CORPORATION reassignment ITT CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01Q19/10—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 reflecting surfaces
    • H01Q19/106—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 reflecting surfaces using two or more intersecting plane surfaces, e.g. corner reflector antennas

Definitions

  • a spade-shaped monopole radiator and a backscreen parallel to said radiator are mounted at an angle with respect to a ground plane. Said monopole is fed against ground by an RF source.
  • an array of spade-shaped monopoles are mounted parallel to a backscreen and at an angle with a ground plane to provide a steerable radiation pattern.
  • spade-shaped monopoles are mounted symmetrically about the plane of symmetry of a Vee-shaped reflector. In said embodiment, said monopoles are also substantially parallel to said reflector.
  • the subject invention relates to a screen-reflector-type antennas and more particularly to those of a type wherein the antenna elements are mounted at an angle with respect to a plane of symmetry defined by the antenna elements and their mirror images.
  • a broadband antenna comprising antenna means having an axis of substantial symmetry, reflector means substantially parallel to said axis of symmetry; and means for providing a mirror image of said antenna means such that said axis of symmetry forms an angle with a plane of symmetry formed between said antenna means and its minor image.
  • FIG. 1 is a perspective illustration of a reflector-type antenna according to the invention
  • FIG. 2 is a perspective illustration of a modified embodiment of the invention representing a reflector-type antenna having an array of radiators;
  • FIG. 3 is a perspective illustration of a dipole array reflector-type antenna according to the invention.
  • FIG. 4 is a perspective illustration of an antenna comprising a cone and a reflector according to the invention.
  • FIG. 5 is a perspective illustration of an antenna comprising a folded triangular monopole and a reflector according to the invention.
  • the axis of symmetry of the radiating element is maintained substantially parallel to the screen so that the element forms a transmission line with its image in said screen.
  • the screen therefore continues its function of reflecting the primary radiation but ceases to act as an efficient secondary radiator.
  • a flat radiator 3 and a backscreen 2 parallel thereto are supported at an angle with respect to ground plane 1 by nonconducting members 10, 11 and 12. Said radiator 3 is fed RF energy from a transmitter 4 via RF transmission line 5.
  • the spacing between the radiator and the backscreen is chosen, by using skills well known to those versed in the art, to provide desired radiation patterns and impedance characteristics.
  • the height of the screen relative to the height of the radiator determines how strongly the radiator is illuminated in an undesirable way by waves diffracted over the top of the screen. Therefore, this height is preferably chosen; so that the response to such diffracted waves is of the same order of magnitude as the response due to the diminished secondary radiation.
  • the width of the screen is preferably chosen so that the radiator lies in its shadow and, consequently, this is a function of the spacing of the radiator from the screen. In order to provide a radiator which is substantially parallel to the screen, the radiator should be of a symmetrical or flat nature.
  • a rectangular form and a triangular form adjacent to one side of said rectangular form define a spade shape having a longitudinal axis of symmetry B and anapex A, which is used to provide a flat broadband radiator.
  • Power is coupled to said radiator at the. apex by using coupling techniques well known in the art.
  • the radiator and/or its associated screen may be constructed from either solid sheet or openwork conducting material.
  • the above-mentioned ground plane should be constructed so that from a desired elevation angle one could, if the ground plane were considered to be a mirror, see the image of the complete radiator 3.
  • a typical example of the above-described antenna, having a 75 elevation with respect to the ground plane, may incorporate the following parameters:
  • A is the longest wavelength of interest.
  • the backscreen may be constructed from a grid of parallel vertically tilted wires.
  • a plurality of flat radiators are mounted parallel to a reflecting screen to provide a steerable array antenna.
  • Such an antenna array is shown in FIG. 2 wherein radiators 3, 6, and 8 are parallel to reflecting screen 2 and are supported at an angle with ground plane I by nonconducting members 10, ll, 12, 13 and 14.
  • the same design considerations as were discussed with respect to the first embodiment are applicable.
  • the width of radiators 3, 6 and 8 may be designed to be consistent with a desired array spacing and the length of said radiators may be designed consistent with the frequency range of operation desired.
  • an antenna assembly comprising reflectors 2 and 18 which have one common edge; radiators 3, 6, 8, and I5, 16, 17, respectively, mounted parallel to said reflectors 2 and I8; and. a nonconducting supporting member 19 which also serves as a conduit for RF signals.
  • Said supporting member is mechanically coupled to said reflecting surfaces and is used as a mechanical support for said antenna elements.
  • the radiators 3, 6, 8, I5, 16 and 17 are coupled to said supporting member 19 according to techniques well known in the art.
  • the third embodiment is, in effect, a dipole version of the second embodiment, i.e., the virtual image has been replaced by a physical image and the ground plane has been removed, the design considerations which determine significant antenna parameters are the same as in the first and second embodiment.
  • the antenna elements themselves be of a broadband nature.
  • folded triangular monopoles or dipoles, as well as cone monopoles or cone dipoles may be used in the place of the spade-shaped radiators previously described.
  • a cone antenna mounted'over a ground plane 1, wherein the reflector 2 and the cone 20 are tilted with respect to said ground plane.
  • the axis of symmetry of said cone 20a is substantially parallel with respect to said reflector 2.
  • the supporting structure. electrical feed and design considerations are the same as described with respect to the first embodiment.
  • a folded triangular monopole antenna mounted over a ground plane wherein the reflector 2 and the folded triangular monopole 21 are tilted with respect to the ground plane 1.
  • the axis of symmetry of said triangular monopole 21a is substantially parallel with respect to reflector 2.
  • a broadband antenna comprising:
  • antenna means having a shape substantially symmetrical along a longitudinal axis mounted at an acute angle with said ground plane;
  • a backscreen reflector electrically isolated from said ground plane mounted substantially parallel to said axis of symmetry.
  • a broadband antenna according to claim 1, wherein said antenna means includes at lease one plane-shaped conducting means.
  • a broadband antenna according to claim 2, wherein said plane-shaped conducting means is spade-shaped.
  • a broadband antenna according to claim 1, wherein said antenna means includes at least one cone antenna.
  • a broadband antenna according to claim 1, wherein said antenna means includes at least one folded triangular monopole.

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  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US874743A 1969-11-07 1969-11-07 Tilted element and tilted screen antenna Expired - Lifetime US3611399A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87474369A 1969-11-07 1969-11-07

Publications (1)

Publication Number Publication Date
US3611399A true US3611399A (en) 1971-10-05

Family

ID=25364468

Family Applications (1)

Application Number Title Priority Date Filing Date
US874743A Expired - Lifetime US3611399A (en) 1969-11-07 1969-11-07 Tilted element and tilted screen antenna

Country Status (3)

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US (1) US3611399A (de)
DE (1) DE2052171A1 (de)
FR (1) FR2067032B3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017866A (en) * 1975-06-19 1977-04-12 Continental Electronics Manufacturing Co. Log sequential antennas
US6140974A (en) * 1998-10-20 2000-10-31 Nortel Networks Limited Antenna arrangement
WO2003063298A1 (en) * 2002-01-22 2003-07-31 Itron, Inc. Rf antenna with unitary ground pland and surface mounting structure
US6650301B1 (en) 2002-06-19 2003-11-18 Andrew Corp. Single piece twin folded dipole antenna
US20040233118A1 (en) * 2003-05-23 2004-11-25 Jocher Ronald William Antenna with reflector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803623A (en) * 1972-10-11 1974-04-09 Minnesota Mining & Mfg Microstrip antenna

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017866A (en) * 1975-06-19 1977-04-12 Continental Electronics Manufacturing Co. Log sequential antennas
US6140974A (en) * 1998-10-20 2000-10-31 Nortel Networks Limited Antenna arrangement
WO2003063298A1 (en) * 2002-01-22 2003-07-31 Itron, Inc. Rf antenna with unitary ground pland and surface mounting structure
US6606065B1 (en) * 2002-01-22 2003-08-12 Itron, Inc. RF antenna with unitary ground plane and surface mounting structure
US6650301B1 (en) 2002-06-19 2003-11-18 Andrew Corp. Single piece twin folded dipole antenna
US20040233118A1 (en) * 2003-05-23 2004-11-25 Jocher Ronald William Antenna with reflector
US7215294B2 (en) * 2003-05-23 2007-05-08 Lucent Technologies Inc. Antenna with reflector

Also Published As

Publication number Publication date
DE2052171A1 (de) 1971-05-13
FR2067032A7 (de) 1971-08-13
FR2067032B3 (de) 1973-08-10

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AS Assignment

Owner name: ITT CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION;REEL/FRAME:004389/0606

Effective date: 19831122