US2624002A - Dielectric antenna array - Google Patents

Dielectric antenna array Download PDF

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Publication number
US2624002A
US2624002A US180226A US18022650A US2624002A US 2624002 A US2624002 A US 2624002A US 180226 A US180226 A US 180226A US 18022650 A US18022650 A US 18022650A US 2624002 A US2624002 A US 2624002A
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guide
dielectric
segments
circular
main
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Maurice G Bouix
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/24—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave constituted by a dielectric or ferromagnetic rod or pipe

Definitions

  • the dielectric portions may be said to act as itransfonmers; for instance they act ashalf-wave transformers if their height is equal to half the wavelength in the guide segments in which they are inserted.
  • Figure 1 illustrates a first embodiment of a compresise array
  • Figure z is a graph showing the relative resist! ance and reactance of a polyrod plotted against theadiameter oi-a coupling hole by which therod is'couplejd to the main guide;
  • Figure :3 is a graph of the length of the matching screw facing each coupling hole inside the main guide, plotted against the diameter of the coupling hole;
  • Figure 4. representssa1sec0nd: em odim n s-f a compressed array
  • Figure 5 represents a 'curvezgiving the wavelength É circular guide of. aHntravellingrwave, plotted against the diameter :of the guide.
  • . Figure .1. refersto a compress d ar ay, .iniW h all the rods: radiate oophasal waveletsgthe-polarisation-of which is paralled to thearray, and this in spite of their being coupled to the rectangular feed :guide at mutual distances less than the guide wavelength Ag; In this example under consideration the" spacing it between the rodsis equal to ,22, 32 are segments of circularguides.
  • the numeral 1 denotes the rectangular feed guide
  • 6 denotes an ultra high frequency power source
  • are dielectric rods and 4
  • I4, 24, .34 are the coupling holes.
  • 5, I5, 25, 35 are the matching screws and 2 l2, 3, I3 23, 33 are the-flanges of said segments vvelded'to the broad side of thegu-ide F.
  • the circular guide 1 2 is fed at its basis with a wave which has a phase retardation of due to its propagation over the distance u in the rectangular guide 1, withtrespect to the wave feeding the circular guide 2 at, its basis.
  • a group of consecutive radiators are coupled to the main guide by like couplings calculated for the first radiator of the group, then a second group of radiators are coupled to the main guide by couplings calculated for the first radiator of the second group, and so on.
  • the table reproduced hereafter gives, for the case of a uniform distribution of power, the relative resistance of each radiator, the radiator denoted in the table by the numeral 1 being the radiator marked I in Figure 1, the radiator denoted by 2 in the table being the radiator marked 'II in Figure 1 and so on.
  • the curve II; of Figure 2 indicates thus' the diameter of the coupling hole of each radiator as depending on the resistance of this latter.
  • the portions on opposite sides of the line 20 corresponding to the point marked ID are plotted with abscissae in difference scales.
  • the part of the curve on the left hand side of the line 20 has been established according to the formula of Bethe giving the law of variation of the resistance as a sixth power D of the diameter D of the coupling hole, see Bethe, The-;
  • the curve 29 of Figure 3 gives the depth of advance of the screws 5, I5, 25, 35 (assumed to be of 3 mm. diameter) as plotted against the diradiating rods the requisite diameter of Bethe 'holes may become greater than the broad side of the guide. In this case the narrow side of the rectangular guide I will be reduced, so reducing the characteristic impedance of the guide and thus the power transmitted through the coupling hole will increase.
  • the coupling holes are bored in the narrow side of the rectangular guide, and the segments of circular guides serving as sockets for dielectric rods are connected to this narrow side.
  • H the common height of all the circular guide segments, Ng the wavelength in the guide segment 29, and Ng the wavelength in the guide segment 39.
  • the circular guide 39 causes a phase-shift:
  • Equation 4 represents the wavelength k in a circular guide as depending on the radius a of this To each value of A of the curve M corresponds a radius a of the circular guide. It will be noted that the Equation 4 comprises a parameter as which may be chosen at will. For practical reasons, in the above example the value has been adopted;
  • the array of Figure 4 will thus comprise odd polyrods identical to 28 and even polyrods identical to 39, the odd ones having a widened root of 20 mm. of diameter fitted into the circular guide segments 29 having the same diameter and a height of 51 mm, and the even ones having a narrowed root of 15.6 mm. of diameter fitted into the circular guide segments 39 having the same diameter.
  • the reactance in each coupling point will be matched by actuating the screws 39, 49
  • a compressed dielectric antenna array comprising a single rectangular air filled main wave guide, means for introducing ultra high frequency waves into said main wave-guide, circular guide segments of the same height welded to said main guide, coupling and matching means comprising holes bored in one wall of the main guide and located on the axis of said guide segments and matching screws facing the holes located in the opposite wall of the main guide, the spacing of adjacent guide segments being smaller than one main-guide wave length and equal to some simple submultiple of said wave length, whereby a given number group of guide segments is coupled to the main guide along each wave length of said guide, radiating circular dielectric rods filled into said circular segments and the bases of which come into contact with the wall of the main guide in which the holes are bored, cylindrical portions of dielectric material of the same height, all terminating in the same plane, located inside all the guide egments except the first of each group and being a part of the bases of the rods, said dielectric portions being adapted to cause simultaneously such a phase shift delay that the wavelets radiated by all the rods be cophas
  • a compressed dielectric antenna array comprising a single rectangular air filled main wave guide, means for introducing ultra high frequency waves into said main wave guide, circular guide segments of the same height welded to said main guide, coupling nd matching means comprising holes bored in one wall of the main guide and located on the axis of said guide segments and matching screws facing the holes located in the opposite wall of the main guide, the spacing of adjacent guide segments being smaller than one main guide wave length and equal to some simple su-bmultiple of said wave length, whereby a given number group of guide segments is coupled to the main guide along each wave length of said guide, radiating circular dielectric rods filled into said circular segments and the bases of which come into contact with the wall of the main guide in which the holes are bored, cylindrical portions of dielectric material of the same height, all terminating in the same plane, located inside all the guide segments except the first of each group and being a part of the bases of the rods, said dielectric portions having dielectric constants determined to cause simultaneously such a phase shift delay that the wavelets radiated by all the rods be cop
  • a compressed dielectric antenna array comprising a single rectangular air filled main wave guide, means for introducing ultra high frequency waves into said main wave guide, circular guide segments of the same height welded to said main guide, coupling and matching means comprising holes bored in one wall of the main guide filled into said circular segments and the bases of which come into contact with the wall of the main-guide in which the holes are bored, cylindrical portions of dielectric material of the same height, all terminating in the same plane, located inside all the guide segments except the first ofeach group and being a part of the bases of the rods, said dielectric portions being constituted of the same dielectric material as the radiating rods and having diameters determined to cause simultaneously such a phase shift delay that the wavelets radiated by all the rods be 00-- phasal and such a wave length in the guide segments in which they are located that the height of the dielectric portions be an integral number of halves of said wave length.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
US180226A 1949-08-19 1950-08-18 Dielectric antenna array Expired - Lifetime US2624002A (en)

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FR682115X 1949-08-19

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FR (1) FR60492E (fr)
GB (1) GB682115A (fr)

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US2802209A (en) * 1952-05-29 1957-08-06 Bell Telephone Labor Inc Antennas employing laminated conductors
US2955287A (en) * 1956-12-31 1960-10-04 Tyner Corp Antenna
US3001193A (en) * 1956-03-16 1961-09-19 Pierre G Marie Circularly polarized antenna system
US3271776A (en) * 1962-12-28 1966-09-06 Hazeltine Research Inc Intercoupling lines for impedance matching of array antennas
US4053894A (en) * 1974-03-21 1977-10-11 Siemens Aktiengesellschaft Radio signal switching system employing dielectric rod antennas
WO1992014277A1 (fr) * 1991-01-31 1992-08-20 Commonwealth Scientific And Industrial Research Organisation Antenne radar
EP0755092A2 (fr) * 1995-07-17 1997-01-22 Plessey Semiconductors Limited Dispositifs d'antenne
WO2004006388A1 (fr) * 2002-07-08 2004-01-15 Saab Ab Antenne de groupe a large bande commandee electriquement, element d'antenne destine a etre introduit dans une telle antenne de groupe, et module d'antenne a plusieurs elements
WO2006077184A1 (fr) * 2005-01-19 2006-07-27 Robert Bosch Gmbh Dispositif pour emettre et recevoir un rayonnement electromagnetique
EP1703590A1 (fr) * 2005-03-18 2006-09-20 Sony Deutschland GmbH Antenne tige dielectrique et procédé de fonctionnement
CN102694276A (zh) * 2012-06-12 2012-09-26 四川大学 一种介质阵列天线
CN105490005A (zh) * 2015-11-17 2016-04-13 西安电子工程研究所 Ku波段圆极化介质天线单元及阵列
WO2018204124A1 (fr) * 2017-05-02 2018-11-08 Rogers Corporation Réflecteur électromagnétique destiné à être utilisé dans un système d'antenne à résonateur diélectrique
US10355361B2 (en) 2015-10-28 2019-07-16 Rogers Corporation Dielectric resonator antenna and method of making the same
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GB682115A (en) 1952-11-05
FR60492E (fr) 1954-11-03

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