US2596595A - Directional antenna system - Google Patents

Directional antenna system Download PDF

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Publication number
US2596595A
US2596595A US55316A US5531648A US2596595A US 2596595 A US2596595 A US 2596595A US 55316 A US55316 A US 55316A US 5531648 A US5531648 A US 5531648A US 2596595 A US2596595 A US 2596595A
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US
United States
Prior art keywords
aerial
frame
coil
structures
segments
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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
US55316A
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English (en)
Inventor
Posthumus Klaas
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
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    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Definitions

  • These short-circuit turns are preferably constituted by sector-shaped metal plates, operating as such, which for the sake of simplicity, will be referred to hereinafter as concentrator segments.
  • Frame aerials according to the above-identified copending application have the advantage of being of very simple construction. Furthermore, if the circumferential length of the frame aerial exceeds the operation wavelength, the natural frequency of the frame aerial may be materially higher than the frequency corresponding to the operation wavelength and the frame aerial exhibits remarkable favourable properties for transmission or reception of wide frequency bands of horizontally polarised energy.
  • the present invention relates to a further improvement of the frame aerials described in the copending application and may be applied with particular advantage, for example, to radio course-making transmitters in which carrierwave energy and sideband energy are fed to different aerials for transmission with different directional diagrams. 5
  • the said aerials are located in one plane and adjacent frame aerials have at least one common shortcircuit turn.
  • the spacing between the center of adjacent frame aerials may thus be smaller than the sum of the corresponding spacings between the frame aerial centre and outer periphery of the annular surface occupied by associated shortcircuit turns.
  • the present invention permits of the frame aerials being as it were intertwined" and dispenses with the splitting up of the central aerial.
  • FIG. 1 and 2 show, by way of example, two preferred embodiments of aerial systems according to the invention comprising respectively 3 and 5 frame aerials.
  • Fig. 1 shows an aerial system comprising three frame-aerial coils I, 2 and 3, which is particularlysuitable for use in beacon transmitters for guide plane indication by the amplitude-comparison method, the carrier-wave energy for unidirectional transmission being fed to the central frame-aerial coil 2 and energy modulated with the use of the outer frame aerials I and 3 5 by means of carrier-wave suppression and different signal frequencies (for example and c./s.) being transmitted with an eight-shaped directional diagram (beacon transmitter type SCS 51).
  • the carrier-wave energy for unidirectional transmission being fed to the central frame-aerial coil 2 and energy modulated with the use of the outer frame aerials I and 3 5 by means of carrier-wave suppression and different signal frequencies (for example and c./s.) being transmitted with an eight-shaped directional diagram (beacon transmitter type SCS 51).
  • each of the frame-aerial coils is surrounded by four concentrator segments co-operating therewith: coil I by segments 4 to 1, coil 2 by segments 1 to ID and coil 3 by segments ill to l3.
  • These concentrator segments essentially transmit the current from a frame-aerial coil to the outer periphery of the associated segments.
  • the segments i and II] are in common to the frame-aerial coils i, 2 and 2, 3 respectively flanking these segments.
  • the outer aerials have no harmful effect on the central aerial. Otherwise, unduly tight couplings between the various frame-aerial coils with their associated concentrator segments are avoided by rendering the coupling between the two concentrator segments 1 and I0 which are in common to two frame-aerial coils and other concentrator segments less tight than the relative coupling between these other concentrator segments; this is achieved by suitable choice of the size of the gaps between the concentrator segments in the manner shown in Fig. 1. It should be noted that the coupling between any concentrator segments and the corresponding frameaerial coils is invariably made equally tight.
  • Fig. 2 shows an aerial system comprising 5 frame-aerial coils, four of which, to wit, [4, I5, l6 and H, are arranged at the corners of a square and the fifth frame-aerial coil [8 being arranged centrally to the others.
  • This aerial system is particularly suitable for transmission of a directional field of horizontally polarised energy?" rotating in a low-frequency rhythm, the carrier.- Wave energy being fed to the central aerial'an'd the other aerials having fedto them the sideband: energy produced by using carrieri-wavesuppres sion to cause phase-shifted signals.-to:-modulate the frequency corresponding withthe desired rotation frequency.
  • the central frame-aerial coil is surrounded by four concentrator segments l9 to 22;.each of:
  • the concentrator segments surrounding aframe-aerial coil may be subdivided, in the manner described in the copending application, in a tangential and/or a radial direction, if'restriction of the natural frequency of the aerial sys-- tem requires it or renders it desirable with a viewto obtaining the mean operation frequency.
  • beacon receivers in which use'is made of aerial systems for reception by the amplitude-comparison method with radiation diagrams overlappingone another orelse for so-called rotary field-receivers.
  • a directional antenna system comprising: plurality offrame antenna structures eachvconstitutjed by a centrally: disposed. open+circuited coil and a group of shortF-circuited loopsiinduc tively; coupled'to said coil and circumferentially arranged. thereabout, the loops extending-1. out-v wardly from the periphery of said coil andbein'g: shaped to. defineadjoining; segments. an an? nular surface surrounding said: coil, said frame: aerial structures being disposedat adjacent poi sitions in a single plane, adjacent structures having. at least one short-circuited'loop incommon.
  • A. directional antenna system comprising: a
  • plurality of frame aerial structures each constituted by a centrally disposed open-circuited single turn coil, and a plurality of short-circuited loops formed by metallic plates inductively coupled to said coil and circumferentially arranged thereabout, the plates extending outwardly from: the periphery of said coil and being shaped to" defineadjoining segments in an annular surface surrounding said coil, said frame aerial structures being disposed at adjacent positions in a single plane, adjacent structures having-at least oneplate incommon.
  • A, directional. antenna system comprising three frame? aerial. structures each constituted by' acentrallytdisposed open-circuited single turn coil and four metallic plates inductively coupled tosaidlcoilandicircumferentially arranged thereabout, said plates extending outwardly from the periphery of said coil and being shaped to define adjoining segments inan annular surface surrounding saidcoil, saidframe aerial structures beingadisposed at adjacentpositions in a single plane; adjacent.- structureshaving one plate in common;
  • Grl'n. alra'dio beaconfor directional plane indicatiomby' the amplitude comparison method whereimcarrier wave: energy and side-band energy: are transrnitted.
  • a directional: antenna system comprising five frame-aerial structures. eachconstituted by a ⁇ centrally disposed open-.circuited coil and four short-circuitedloops inductively coupled to said coil and circumferentially' arranged thereabout, theiloopsrextending"outwardly from the periphery ofisai'di coil and. beingshaped. to define adjoining segments in an annular surface surrounding said coil; said. structures being adjacently disposed within. a; single" plane'; the.
  • each loop-in saidsfif-th structure being in common with one -l'oop in eaclr-ofthefour of said structures.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US55316A 1947-12-23 1948-10-19 Directional antenna system Expired - Lifetime US2596595A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL657343X 1947-12-23

Publications (1)

Publication Number Publication Date
US2596595A true US2596595A (en) 1952-05-13

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ID=19795271

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Application Number Title Priority Date Filing Date
US55316A Expired - Lifetime US2596595A (en) 1947-12-23 1948-10-19 Directional antenna system

Country Status (5)

Country Link
US (1) US2596595A (no)
BE (1) BE486465A (no)
FR (1) FR58922E (no)
GB (1) GB657343A (no)
NL (1) NL78888C (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005088A1 (en) * 1996-07-29 1998-02-05 Motorola Inc. Magnetic field antenna and method for field cancellation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519350A (en) * 1937-12-06 1940-03-21 Standard Telephones Cables Ltd Directional radio antenna arrays
US2289856A (en) * 1940-09-25 1942-07-14 Internat Telephone & Eadio Mfg Broadcasting antenna system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519350A (en) * 1937-12-06 1940-03-21 Standard Telephones Cables Ltd Directional radio antenna arrays
US2289856A (en) * 1940-09-25 1942-07-14 Internat Telephone & Eadio Mfg Broadcasting antenna system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005088A1 (en) * 1996-07-29 1998-02-05 Motorola Inc. Magnetic field antenna and method for field cancellation

Also Published As

Publication number Publication date
BE486465A (no)
FR58922E (fr) 1954-04-22
GB657343A (en) 1951-09-19
NL78888C (no)

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