US2201807A - Direction finder loop - Google Patents

Direction finder loop Download PDF

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Publication number
US2201807A
US2201807A US118458A US11845836A US2201807A US 2201807 A US2201807 A US 2201807A US 118458 A US118458 A US 118458A US 11845836 A US11845836 A US 11845836A US 2201807 A US2201807 A US 2201807A
Authority
US
United States
Prior art keywords
loop
conductor
frame
antenna
leads
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
US118458A
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English (en)
Inventor
Berndt Walter
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2201807A publication Critical patent/US2201807A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/04—Details
    • G01S3/06—Means for increasing effective directivity, e.g. by combining signals having differently oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna
    • G01S3/065—Means for increasing effective directivity, e.g. by combining signals having differently oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna by using non-directional aerial

Definitions

  • This invention relates to an improved direction finder loop or frame antenna for. transmitting and receiving radio frequency waves.
  • the present invention concerns a loop or frame antenna arrangement with no, or only very small antenna eifect.
  • the directional diagrams of frame antenna correspond to the calculated ones only if the antenna effect of frame can be successfully eliminated.
  • Variousmeans are known in the art for accomplishing this purpose.
  • Frame and input circuit may be developed symmetrically; the frame or loop conductor may be screened electrically; the lead lines to the frame may be grounded over differential condensers or the antenna efiect may finally be compensated by an auxiliary antenna.
  • the antennaeffect still exists to a considerable extent and is always compensated by the means cited last, that is, by an auxiliary antenna.
  • the antenna required must have a definite effective minimum height. But it is in many cases inconvenient to employ a large! auxiliary antenna. It is desirable for this reason to construct frame antennas with as small as possible antenna effect.
  • a loop or frame is constructed in the manner that the leads to the frame or loop conductor ends pass through the perpendicular loop diameter to divide symmetrically the plane enclosed by frame.
  • the lead line is suitably shielded metallically and the midpoint of the conductor connected with the shielding member.
  • R therein is a frame or loop conductor with one coil.
  • a pair of loop leads Z are twisted and connect at top points P1 and P2 of conductor R and are shielded by a metallic pipe S which passes through the diameter of the loop in the axis of rotation thereof and is connected with a mass or the earth.
  • the midpoint of the frame coil or conductor R. is connected with the shielding of the leads at a central point M.
  • a frame arrangement of this type has a very small antenna effect even when the frame is disposed asymmetrically to the apparatus or earth. Measurements with a rotatable shortwave receiving frame resulted for the frame minimum in a receiver input potential of 1% of maximum while the usual frames showed about 10 to on the same wave range. At the same time, both minima. of the arrangement according to invention are always of equal sharpness, while in the frames used in the prior art that sharpness is mostly different at the two sides.
  • auxiliary antenna-need is substantially smaller than in the usual frames-due to the small antenna effect.
  • Auxiliary antennas are usually sufficient whose limiting dimensions are considerably smaller than the one of the frame.
  • a particular advantage or object of invention lies in the fact that the length of the frame leads have no influence on the sharpness of the minimum.
  • the described principle may likewise be utilized for frames with several coils or conductor turns.
  • the frame windings may further be electrically screened in known manner.
  • the loop may have the form of a circle or a polygon; yet it may deviate therefrom, in particular the proportion: height to width.
  • rotatable frames it suits the purpose best to arrange the leads in axis of rotation. It is evident that all observations made hold true for transmitter, as well as for receiver nected to a point of the frame located opposite the earthing point.
  • a rotatable loop aerial comprising at least substantially one conducting turn with two open terminal ends, said loop being adapted to be energized by radiant wave energy and positioned with its open terminal ends at the highest mechanical point on said loop to electrically maintain a point of relatively low radio frequency potential, a connection at a central point on said conductor intermediate its terminal ends forming a point of relatively low potential, leads connecting said terminals to high frequency apparatus, and a metallic shield having its axis located in the central plane of said loop and extending within the confines of the loop aerial for enclosing and electrically shielding said leads.
  • a directional antenna comprising a rotatable loop having at least one conductor turn with two open terminal ends located at the extreme upper portion of said loop, a pair of leads each one of which is connected to one of the terminal ends of said rotatable loop, a metallic tube arranged to pass through the central portion of said loop and Within the confines of said conductor turn, said pair of leads passing through said metallic tube to electrically divide said loop symmetrically with respect to said conductor turn to reduce the antenna effect thereon, and a conductive connection from the midpoint of said conductor turn to said metallic tube.
  • a directional antenna comprising a rotatable conductive loop having a plurality of conductor turns with two open terminal ends located at the upper portion of said loop, a pair of conductive leads arranged to pass substantially through the axis of rotation and within the confines of said conductor turns, each one of said leads connected to one of the open terminal ends of said conductor turns, and forming means for electrically subdividing said loop symmetrically with respect to said conductor turns to reduce the antenna effect on said loop.
  • a directional antenna comprising a rotatable circular loop having at least one conductor turn with two open terminal ends located at the extreme upper portion of said rotatable loop, a pair of twisted conductive leads each one of which is connected to one of the terminal ends and arranged to pass through the diameter of said loop, a metallic shielding pipe disposed within the diameter and axis of rotation of said loop, said conductive leads passing through said shielding pipe to electrically divide the conductor turn symmetrically to reduce the antenna eifect on said loop.
  • a directional antenna comprising a rotatable loop having at least one circular conductor turn with two open terminal ends located at the extreme upper portion of said rotatable loop, a pair of conductive leads each one of which is connected to one of the terminal ends of said rotatable loop, a metallic shielding pipe disposed within the diameter of said conductor turn for shielding said leads, and a midpoint conductive connection from the lower midpoint of said conductor turn and the outside of said metallic shielding pipe, said midpoint conductive connection being connected to ground.
  • a directional antenna comprising a rotatable loop having a plurality of circular conductor turns with two open terminal ends located at the extreme upper portion of said rotatable loop, a pair of conductive leads each one of which is connected to one of the terminal ends of said rotatable loop, a metallic shielding pipe located at the diameter of said conductor turns for shielding said leads, and a midpoint conductive connection from the lower midpoint of said conductor turns and the outside of said metallic shielding pipe, said midpoint conductive connection being connected to ground.
  • a directive aerial comprising at least one turn of conductive material arranged substantially in a plane with the terminals of said conductive material adjacent to each other to form a substantially closed loop, means connecting a point on said conductor substantially symmetrically spaced from the terminals thereof to ground or equivalent potential, leads connected to the terminals of said conductor passing across said loop substantially in said plane, a shield member enclosing said leads substantially throughout their entire length across said loop, and a connection between said shield member and said point of contact or equivalent potential.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
US118458A 1935-11-09 1936-12-31 Direction finder loop Expired - Lifetime US2201807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2201807X 1935-11-09

Publications (1)

Publication Number Publication Date
US2201807A true US2201807A (en) 1940-05-21

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ID=7989803

Family Applications (1)

Application Number Title Priority Date Filing Date
US118458A Expired - Lifetime US2201807A (en) 1935-11-09 1936-12-31 Direction finder loop

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US (1) US2201807A (en(2012))
NL (1) NL45513C (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490815A (en) * 1945-01-27 1949-12-13 Standard Telephones Cables Ltd Loop antenna
US2785396A (en) * 1946-01-09 1957-03-12 Philip S Carter Large circumference loop antennas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490815A (en) * 1945-01-27 1949-12-13 Standard Telephones Cables Ltd Loop antenna
US2785396A (en) * 1946-01-09 1957-03-12 Philip S Carter Large circumference loop antennas

Also Published As

Publication number Publication date
NL45513C (en(2012))

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