WO2008102987A1 - Antenne cornet de type réseau à double polarisation linéaire - Google Patents

Antenne cornet de type réseau à double polarisation linéaire Download PDF

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Publication number
WO2008102987A1
WO2008102987A1 PCT/KR2008/001008 KR2008001008W WO2008102987A1 WO 2008102987 A1 WO2008102987 A1 WO 2008102987A1 KR 2008001008 W KR2008001008 W KR 2008001008W WO 2008102987 A1 WO2008102987 A1 WO 2008102987A1
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WO
WIPO (PCT)
Prior art keywords
polarization
guide
tube
branch tube
waveguide
Prior art date
Application number
PCT/KR2008/001008
Other languages
English (en)
Inventor
Seung Joon Im
Chang Wan Ryu
Jae Ho Ko
Original Assignee
Idoit Co., Ltd.
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
Priority claimed from KR1020070021929A external-priority patent/KR100865956B1/ko
Application filed by Idoit Co., Ltd. filed Critical Idoit Co., Ltd.
Publication of WO2008102987A1 publication Critical patent/WO2008102987A1/fr

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Classifications

    • 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
    • H01Q13/02—Waveguide horns
    • H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
    • H01Q13/0258—Orthomode horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/064—Two dimensional planar arrays using horn or slot aerials

Definitions

  • the present invention relates to a horn array type antenna for dual linear polarization, and more particularly, a horn array type antenna for dual linear polarization for improving an antenna performance and reducing a size of antenna.
  • Waves traveling higher than ultrahigh frequency have very short wavelengths and have characteristics similar to light.
  • the technology has advanced itself to improve the directivity, applying optics theory or the theory that says a megaphone concentrates a sound wave.
  • Such antennas with enhanced directivity, are known as horn antenna, parabola antenna, lens antenna, and slot antenna which have waveguides with holes formed thereon.
  • the horn antenna is formed of a waveguide with one end formed in a horn shape and opened at both ends.
  • the horn antenna propagates electromagnetic waves along the waveguide by vibrating one end of the waveguide so as to radiate to the air.
  • the impedance between the waveguide and the air is not matching, it reflects a part of the electromagnetic wave, which means that the entire energy is not radiated to the air. Therefore, a horn antenna is designed to have its waveguide opening to be gradually wider so that it matches the impedance between the air and the waveguide and allows it to maximally radiate energy through the opening.
  • Fig. 1 is the cross-sectional view of a horn in a general horn antenna.
  • the horn antenna shows an outer opening 2 facing the air, and an inner opening 3 at a side where the vibration starts.
  • the size of the outer opening 3 decides the performance of the antenna.
  • a ratio (S /S ) of the size of the outer opening 2 and that of the inner opening 3 influences the performance of the antenna.
  • the ratio (S /S ) of the size of the outer opening 2 and the inner opening 3, i.e., the difference between the size of the outer opening 2 and that of the inner opening 3 and the gradient of the horn are important factors that decide the performance. Therefore, the horn should be longer and accordingly the overall size of the antenna should be larger.
  • an object of the present invention is to provide a horn array antenna for dual linear polarization having an improved antenna performance and a small size.
  • a horn array antenna including a horn which guides incoming or outgoing electromagnetic waves; a first polarization guide which has one end connected to the horn and has a plurality of paths arranged adjacent to one another to guide a first polarization; and a second polarization which has one end connected to the horn and is arranged parallel with the first polarization guide, for guiding a second polarization having an electric field directivity perpendicular to the first polarization.
  • the horn may include an inclined part which is tapered along an advancing direction of electromagnetic waves and which has at least one ledge protruding from an end of an inner opening formed at a narrower end of the horn toward a center area, and a polarization filtering unit which is tubular and connects the inner opening where the ledge is formed and the first polarization guide.
  • the inclined part may have at least one protruding guide protruding from an inner surface of the inclined part along a circumference of the inclined part.
  • the polarization filtering unit may have an opening formed on one side thereof to be connected to the first polarization guide, a pair of shielding screens is formed on the opening to shield opposite ends of a horizontal direction of the opening, and a slot is formed between the pair of shielding screens.
  • the polarization filtering unit may have a bending protrusion which protrudes from the shielding screens at the opposite surfaces adjacent to the opening and is bent upwardly.
  • a protruding rib which is elongated in a vertical direction, may protrude from a center area of an inner surface facing the opening of the polarization filtering unit.
  • the polarization filter unit may have a first step which protrudes from a lower portion of the opening toward the inside of the polarization filtering unit and a second step which protrudes from a lower portion of the protruding rib toward the inside of the polarization filtering unit.
  • the first polarization guide may include a first waveguide which has a pair of openings connected a pair of the horns, a second waveguide which has a pair of openings connected another pair of the horns and is arranged parallel with the first waveguide, and a first mixing tube which provides the first polarization to the first waveguide and the second waveguide or mixes the first waveguides from the first waveguide and the second waveguide, and has a first main opening through which the first polarization enters or is emitted.
  • the first polarization guide may further include a first guide tube which forms the plurality of paths and connects the first waveguide and the first mixing tube, and a second guide tube which connects the second waveguide and the first mixing tube.
  • the first waveguide may have a first split plate and a second split plate which are elongated in a lengthwise direction and protrude from opposite side walls of the first waveguide, and a first cut-off part may be formed by cutting off a part from a middle area of the first split plate and a first protrusion may protrude from a middle area of the second split plate toward the first cut-off part.
  • the second waveguide has a third split plate and a fourth split plate which are elongated in a lengthwise direction and protrude from opposite side walls of the second waveguide, and a second cut-off part may be formed by cutting off a part from a middle area of the third split plate and a second protrusion may protrude from a middle area of the fourth split plate toward the second cut-off part.
  • the first guide tube may be connected to upper areas of the first and the second split plates of the first waveguide, and the second guide tube may be connected to lower areas of the third and the fourth split plates of the second waveguide.
  • the first guide tube and the second guide tube may have ends which are arranged one on the other toward the first mixing tube.
  • the first guide tube and the second guide tube may be bent in the shape of "L".
  • the first mixing tube may have a first protrusion piece which protrudes from an area of the first mixing tube in a lengthwise direction inwards the first mixing tube, for reducing a width of the first mixing tube.
  • the second polarization guide may include a third waveguide which is connected a pair of the polarization filtering units and changes an advancing direction of the second polarization, a fourth waveguide which is connected to another pair of the polarization filtering units and is arranged parallel to the third waveguide, and a second mixing tube which connects the third waveguide and the fourth waveguide and has a second main opening through which the second polarization enters or is emitted.
  • the third waveguide and the fourth waveguide each may have opposite ends upwardly opened to fluidly communicate with the polarization filtering unit, and a first direction change protrusion and a second direction change protrusion may be formed on the area where the third waveguide and the fourth waveguide penetrate through the polarization filtering unit to change the advancing direction of the second polarization.
  • the third waveguide and the fourth waveguide may have a third protrusion and a fourth protrusion which extend from middles areas of the third waveguide and the fourth waveguide in a lengthwise direction toward the second mixing tube by a predetermined width.
  • the third waveguide and the fourth waveguide may have a first inclined surface and a second inclined surface which are formed at opposite ends of the third waveguide and the fourth waveguide in opposite to the first and the second direction change protrusions and are inclined by a predetermined angle.
  • a fifth protrusion may protrude from an area of the second mixing tube between the third waveguide and the fourth waveguide in a lengthwise direction of the third and the fourth waveguides.
  • the horn array antenna may further include a splitter which is connected to an upper portion of the horn and has ribs to split an openings of the horn into a plurality of openings.
  • the ribs may be arranged in a vertical direction and a horizontal direction of the splitter at predetermined intervals in a lattice pattern.
  • a horn array antenna for dual linear polarization which includes a second layer where a horn is formed to guide incoming or outgoing electromagnetic waves, a third layer and a fourth layer forming a first polarization guide which is connected to one end of the horn and has a plurality of paths arranged adjacent to one another to guide first polarizations, and a fifth layer forming a second polarization guide which is connected to one end of the horn and arranged parallel to the first polarization guide, for guiding second polarizations having an electric field directivity perpendicular to the first polarizations.
  • the horn array antenna may further include a first layer forming a splitter which is connected to an upper portion of the horn and has ribs to split an opening of the horn into a plurality of openings.
  • the horn formed on the second layer may include an inclined part which is tapered along an advancing direction of electromagnetic waves and has at least one ledge protruding from an end portion of an inner opening formed on a narrower end of the inclined part toward a center area, and a tubular polarization filtering unit which connects the inner opening where the ledge is formed and the first polarization guide.
  • the first polarization guide formed by the third layer and the fourth layer may include a first waveguide which has a pair of openings connected to a pair of the horns, a second waveguide which has a pair of openings connected another pair of the horns and is arranged parallel with the first waveguide, a first mixing tube which provides the first polarizations to the first waveguide and the second waveguide or mixes the first polarizations from the first waveguide and the second waveguide, and has a first main opening through which the first polarizations enter or are emitted, a first guide tube which connects the first waveguide and the first mixing tube, and a second guide tube which connects the second waveguide and the first mixing tube.
  • the third layer may include a third upper layer and a third lower layer which form upper areas of the first waveguide, of the second waveguide, and of the first mixing tube, and the first guide tube, and are layered one on the other.
  • the fourth layer may include a fourth upper layer and a fourth lower layer which form lower areas of the first waveguide, of the second waveguide, and of the first mixing tube, and the second guide tube, and are layered one on the other.
  • the second polarization guide formed on the fifth layer may include a third waveguide which is connected to a pair of the polarization filtering units and changes an advancing direction of the second polarizations, a fourth waveguide which is connected to another pair of the polarization filtering unit and is arranged parallel with the third waveguide, and a second mixing tube which connects the third waveguide and the fourth waveguide and has a second main opening through which the second polarizations enter or are emitted.
  • the fifth layer may include a fifth upper layer and a fifth lower layer which form the third waveguide, the fourth waveguide, and the second mixing tube, and are layered one on the other.
  • the first polarization guide and the second polarization guide may be a plurality of first polarization guides and a plurality of second polarization guides which are arranged in a row direction and a column direction.
  • the horn array antenna may further include at least one symmetrical branch tube which connects the first polarization guides or the second polarization guides in the ratio of 1 : 1 , and at least one asymmetrical branch tube which connects the first polarization guides and the second polarization guides in the ratio of 1 :n.
  • Ends of the symmetrical branch tube and the asymmetrical branch tube may be narrower than widths of tubes connected thereto.
  • the asymmetrical branch tube may include a port 1 and a port 2 which are formed opposite to each other and a port 3 which is formed in perpendicular relation to the port 1 and the port 2, and the port 1 and the port 2 each may have a width adjusting protrusion protruding therefrom inwards to reduce a width of the asymmetrical branch tube.
  • the width adjusting protrusion may protrude from an upper surface and a lower surface of the asymmetrical branch tube by a predetermined distance, and may be formed one of the port 1 and the port 2 that is connected to a relatively smaller number of first polarization guides or second polarization guides.
  • a guide screen may be formed between the port 1 and the port 2 toward the port 3 with a predetermined length.
  • asymmetrical branch tubes connecting the first polarization guides may be formed a first polarization discharge outlet through which the first polarizations from the first polarization guides enter or are emitted, and on one of the asymmetrical branch tubes connecting the first polarization guides may be formed a second polarization discharge outlet through which the second polarizations from the second polarization guides enter or are emitted.
  • the performance of the antenna can be improved while the size of the antenna is reduced.
  • Fig. 1 is the cross-sectional view of a horn in a general horn antenna
  • FIG. 2 is a plan view of a horn array antenna for dual linear polarization according to an exemplary embodiment of the present invention
  • FIG. 3 is a plan perspective view of the horn array antenna for dual linear polarization of Fig. 2,
  • FIG. 4 is a bottom perspective view of the horn array antenna for dual linear polarization of Fig. 2,
  • FIG. 5 is a transparent perspective view of the horn of the horn array antenna for dual linear polarization according to the exemplary embodiment of the present invention
  • Figs. 6 and 7 are partially-cut perspective views of the horn of Fig. 5,
  • Fig. 8 is a side-section view of the horn of Fig. 5,
  • Fig. 9 is a perspective view the horns assembled with one another for a single antenna unit
  • Fig. 10 is a perspective view of the first polarization guide and the second polarization guide of Fig. 2 in an assembled state
  • Fig. 11 is a plan view illustrating the first polarization guide and the second polarization guide of Fig. 2 in the assembled state
  • Fig. 12 is a bottom view of the first polarization guide and the second polarization guide of Fig. 2 in the assembled state
  • FIG. 13 is a perspective view of the first polarization guide of Fig. 2,
  • Fig. 14 is a transparent perspective view of the first polarization guide of Fig. 2,
  • Fig. 15 is a plan view of the first polarization guide of Fig. 2,
  • Fig. 16 is a bottom view of the first polarization guide of Fig. 2,
  • Fig. 17 is an enlarged perspective view of the first guide tube and the second guide tube of Fig. 13,
  • FIG. 18 is a perspective view of the second polarization guide of Fig. 2,
  • Fig. 19 is a transparent perspective view of the second polarization guide of Fig. 18,
  • FIG. 20 is a plan view of the second polarization guide of Fig. 18,
  • Fig. 21 is a bottom view of the second polarization guide of Fig. 18,
  • Fig. 22 is a perspective view of a T-shaped branch tube applicable to the present invention
  • Fig. 23 is an exploded perspective view illustrating layers constituting the horn array antennal for dual linear polarization according to the exemplary embodiment of the present invention in the unit of antenna
  • Fig. 24 is a plan view of the second layer of Fig. 23,
  • FIG. 25 is a perspective view of the second layer of Fig. 23,
  • Fig. 26 is a plan view of a third upper layer of Fig. 23,
  • FIG. 27 is a perspective view of the third upper layer of Fig. 23,
  • Fig. 28 is a bottom view of the third upper layer of Fig. 23.
  • FIG. 29 is a perspective view of the third lower layer of Fig. 23,
  • FIG. 30 is a perspective view of the third lower layer of Fig. 23,
  • Fig. 31 is a bottom view of the third lower layer of Fig. 23.
  • FIG. 32 is a plan view of a fourth upper layer of Fig. 23,
  • FIG. 33 is a perspective view of the fourth upper layer of Fig. 23,
  • Fig. 34 is a bottom view of the fourth upper layer of Fig. 23.
  • Fig. 35 is a plan view of the fourth lower layer of Fig. 23,
  • Fig. 36 is a perspective view of the fourth lower layer of Fig. 23,
  • Fig. 37 is a bottom view of the fourth lower layer of Fig. 23.
  • Fig. 38 is a plan view of a fifth upper layer of Fig. 23,
  • FIG. 39 is a perspective view of the fifth upper layer of Fig. 23,
  • Fig. 40 is a bottom view of the fifth upper layer of Fig. 23.
  • Fig. 41 is a plan view of the fifth lower layer of Fig. 23,
  • Fig. 42 is a perspective view of the fifth lower layer of Fig. 23.
  • FIGs. 43 and 44 are bottom perspective views of an example of arrangement of the first polarization guides of the horn array antenna for dual linear polarization according to the exemplary embodiment of the present invention
  • FIGs. 45 and 46 are bottom perspective views of an example of arrangement of the second polarization guides of the horn array antenna for dual linear polarization according to the exemplary embodiment of the present invention.
  • Fig. 47 is an enlarged perspective view of a T-shaped tube used as the first asymmetrical branch tube and the second asymmetrical branch tube of Figs. 43 and 44.
  • a horn array antenna for dual linear polarization performs a function of either receiving or transmitting electromagnetic waves.
  • the elements of the horn array antenna for dual linear polarization will be described based on an electromagnetic wave receiving function at first. Afterward, a transmitting function of the horn array antenna will be described.
  • a first polarization denotes a horizontal polarization (H polarization) parallel to the equator of earth
  • a second polarization denotes a vertical polarization (V polarization) which is perpendicular to the equator of earth.
  • FIG. 2 is a plan view of a horn array antenna for dual linear polarization according to an exemplary embodiment of the present invention
  • Figs. 3 and 4 are a plan perspective view and a bottom perspective view of the horn array antenna for dual linear polarization of FIG. 2, respectively.
  • a horn array antenna 501 for dual linear polarization includes a plurality of horns 510 on which electromagnetic waves are incident, a lattice type splitter 570 mounted to upper portions of the horns 510, a first polarization guide 530 for guiding first polarizations of the electromagnetic waves incident through the horns 510, and a second polarization guide 550 for guiding second polarizations of the electromagnetic waves incident through the horns 510.
  • the four (4) horns 510 are opened to the air, and the first polarization guide 530 is formed under the horns 510 and the second polarization guide 550 is formed under the first polarization guide 530.
  • the horns 510 and the first and the second polarization guides 530, 550 provide a space where the electromagnetic waves travel. Layers for forming the horns 510 and the first and the second polarization guides 530, 550 will be described below.
  • FIG. 5 is a transparent perspective view of the horn of the horn array antenna for dual linear polarization according to the exemplary embodiment of the present invention
  • Figs. 6 and 7 are partially-cut perspective views of the horn of Fig. 5
  • Fig. 8 is a side-section view of the horn of Fig. 5
  • Fig. 9 is a perspective view the horns assembled with one another for a single antenna unit.
  • a single antenna unit includes four (4) horns 510 and each horn
  • 510 has an outer opening which is split into four (4) openings by the splitter 570. That is, a single antenna unit has sixteen (16) openings.
  • the splitter 570 mounted to upper portions of the horns 510 is formed of a plurality of ribs 575 which are arranged in a lattice pattern, and the ribs 575 of the splitter 570 crisscross with respect to the outer opening of the one horn 510. That is, the outer opening of the horn 510 is split into four (4) small openings. As the outer opening of the horn 510 is split into a plurality of openings by the ribs 575, a sidelobe of the antenna can be reduced and radiation efficiency can be improved.
  • the horn 510 guides electromagnetic waves such that a first polarization and a second polarization having a mutually perpendicular directivity on an incident surface are incident.
  • the horn 510 includes an inclined part 515 formed in a quadrangular pyramid shape and a polarization filtering unit 520 formed at one end of the inclined part 515.
  • the inclined part 515 is tapered along an advancing direction of the electromagnetic waves and is opened at their opposite ends.
  • One of the ends of the inclined part 515 that is toward the splitter 570 is referred to as an outer opening and the other end that is formed at an narrower, inner end of the inclined part 515 in a rectangular shape is referred to as an inner opening.
  • the inner opening has a ledge 517 projecting from an edge thereof to a center and the ledge 517 projects along a circumference of the inner opening with a predetermined width.
  • the inclined part 515 shown in Figs. 5 to 8 has the ledge 517 projecting along the inner opening with a predetermined width such that the inner opening has a rectangular shape.
  • a pair of protruding guides 518a, 518b is formed along an inner surface of the inclined part 515.
  • the pair of protruding guides 518a, 518b is spaced from each other by a predetermined distance along an inner surface and are formed in a circumferential direction of the inclined part 515.
  • At least one of the protruding guides 518a, 518b is formed such that the height of the horn array antenna can be reduced, yet still the performance of the horn array antenna can be maintained or improved.
  • the two protruding guides 518a, 518b are formed on the inclined part but this is merely an example.
  • the number of protruding guides 518a, 518b is variable.
  • the horn array antennal for dual liner polarization shown in Fig. 2 employs the horn illustrated in Fig. 8, but may employ a horn having a different configuration or size.
  • the four (4) horns 510 described above, a single first polarization guide 530 and a single second polarization guide 550 constitute a single antenna unit.
  • the horn array antenna 501 for dual linear polarization will be described with reference to the single antenna unit.
  • the four horns 510 will be referred to as first, second, third, and fourth horns.
  • the polarization filtering unit 520 is connected to the inner opening of the inclined part 515 and the four (4) polarization filtering units 520 are provided for the single antenna unit.
  • Each polarization filtering unit 520 passes only a specific polarization of electromagnetic waves incident through each horn 510, i.e., passes only second polarizations and does not pass first polarizations.
  • the polarization filtering unit 520 has an opening formed on an inside surface thereof and fluidly communicating with the first polarization guide 530. A lower end of the opening further protrudes toward the inside of the polarization filtering unit 520 than an upper end of the opening such that a first step 523 is formed.
  • a pair of shielding screens 511 which has a vertically elongated plate shape, is formed at opposite sides of an entrance of the opening and is spaced from each other by a predetermined distance.
  • a vertically elongated slot is formed between the shielding screens 511. From a conjunction area between the shielding screens 511 , a split plate 537 protrudes forwardly by a predetermined length on one hand and extends backwardly on the other hand.
  • the split plate 537 is wider than the shielding screens 511 by a predetermined width.
  • the shielding screens 511 each has an "L" shaped bending protrusion 512 protruding from an area adjacent to an inside surface of the polarization filtering unit 520 and then upwardly bent.
  • the bending protrusion 512 protrudes from an area of the shielding screen 511 where the split plate 537 is formed.
  • the polarization filtering unit 520 has a second step 525 protruding from an inside surface of an area facing the lower end of the opening of the polarization filtering unit 520. Also, a protruding rib 521, which has a vertically elongated shape, is formed above the second step 525 on an area corresponding to the slot 513. Due to the presence of the protruding rib 521 and the bending protrusion 512, the parameter SI l of the vertical polarization can be improved.
  • the polarization filtering unit 520 has a width which becomes gradually narrower due to the presence of the first step 523 and the second step 525, and accordingly, the first polarizations and the second polarizations are separated from each other by the polarization filter unit 520 and are provided to the first polarization guide 530 and the second polarization guide 550.
  • the first polarizations which have the same electric field directivity as the wider width of the polarization filtering unit 520, do not pass the polarization filtering unit 520 and is guided to the first polarization guide 530
  • the second polarizations which have the same electric field directivity as the narrower width of the polarization filtering unit 520, passes through the first step 523 and the second step 525 of the polarization filtering unit and is guided to the second polarization guide 550.
  • the numbers of the first step 523 and the second step 525 and the dimensions thereof are variable depending on the frequency of the second polarizations guided to the second polarization guide 550.
  • Fig. 10 is a perspective view of the first polarization guide and the second polarization guide of Fig. 2 in an assembled state
  • Fig. 11 is a plan view illustrating the first polarization guide and the second polarization guide of Fig. 2 in the assembled state
  • Fig. 12 is a bottom view of the first polarization guide and the second polarization guide of Fig. 2 in the assembled state.
  • the first polarization guide 530 and the second polarization guide 550 receive the first polarizations and the second polarizations from the four (4) polarization filtering units 520, and the four (4) polarization filtering units are located on the four sides of the first polarization guide 530 and the second polarization guide 550.
  • the first polarization guide 530 has a first main opening 548 through which the first polarizations enter or exit
  • the second polarization guide 550 has a second main opening 568 through which the second polarizations enter or exit.
  • the first main opening 548 and the second main opening 568 are formed in a perpendicular relation to each other.
  • Fig. 13 is a perspective view of the first polarization guide of Fig.
  • Fig. 14 is a transparent perspective view of the first polarization guide of Fig. 2
  • Fig. 15 is a plan view of the first polarization guide of Fig. 2
  • Fig. 16 is a bottom view of the first polarization guide of Fig. 2.
  • the first polarization guide 530 guides the first polarizations entering through the four (4) horns 510 and emits them, and has four (4) openings formed at the four sides thereof and connected to the four (4) polarization filtering units 520.
  • the first polarization guide 530 includes a first waveguide 535 connecting a pair of openings, a first guide tube 546 connected to a middle area of the first waveguide 535 in a bent shape, a second waveguide 540 connecting the other pair of openings, a second guide tube 547 connected to a middle area of the second waveguide 540 in a bent shape, and a first mixing tube 545 connected to ends of the first guide tube 546 and the second guide tube 546 and 547.
  • a pair of split plates 536, 537 extending from the pair of shielding screens 511 is formed in each of the first waveguide 535 and the second waveguide 540 along a lengthwise direction of the first waveguide 535 and the second waveguide 540.
  • One of the split plates 536, 537 formed in the first waveguide 535 that is connected to the first guide tube 546 is referred to as a first split plate 536, and the other one facing the first split plate 536 is referred to as a second split plate 537.
  • One of the split plates 541, 542 formed in the second waveguide 540 that is connected to the second guide tube 547 is referred to as a third split plate 541, and the other one facing the third split plate 541 is referred to as a fourth split plate 542.
  • the first through the fourth split plates 536, 537, 541, and 542 are formed in the middle areas of the first wave guide 535 and the second waveguide 540 in a vertical direction such that the first waveguide 535 is split into an upper area and a lower area by the first split plate 536 and the second split plate 537, and the second waveguide 540 is split into an upper area and a lower area by the third split plate 541 and the fourth split plate 542.
  • the first split plate 536 and the third split plate 541 each has a cut-off part formed on a middle portion thereof in a lengthwise direction and in a the shape of "D". That is, a first cut-off part 538 is formed on the first split plate 536 and a second cut-off part 543 is formed on the third split plate 541.
  • the second split plate 537 and the fourth split plate 542 has a first protrusion 539 and a second protrusion 544, respectively, protruding from middle portions thereof toward the first split plate 536 and the third split plate 541 and formed in a lengthwise direction.
  • the first protrusion 539 and the second protrusion 544 are elongated in a vertical direction to connect an upper surface and a lower surface of the first waveguide 535 and the second waveguide 540.
  • the frequency of the first polarizations entering into or exiting from the first polarization guide 530 can be adjusted by varying thicknesses and lengths of the first and the second protrusions 539, 544 and widths of the first and the second cut-off parts 538, 543.
  • the first guide tube 546 is connected to an area of the first waveguide 535 where the first split plate 536 is formed, and is bent in the shape of "L".
  • the height of the first waveguide 535 corresponds to a half of the height of the first guide tube 546.
  • the first guide tube 546 is connected to an upper area of the first waveguide 535 and a lower surface of the first waveguide 535 is coplanar with the first split plate 536.
  • the second guide tube 547 has the same height as that of the first guide tube 546 and is connected to an area of the second waveguide 540 where the third split plate 541 is formed and it is bent in the shape of "L". Compared to the first guide tube 546, the second guide tube 547 is connected to a lower area of the second waveguide 540 and an upper surface of the second waveguide 540 is coplanar with the third split plate 541. Ends of the first guide tube 546 and the second guide tube 547 are bent in the same direction and are located one on the other. Also, sidewalls of the first guide tube 546 and the second guide tube 547 are interconnected to each other at the ends of the first and the second guide tubes 546, 547.
  • Fig. 17 is an enlarged perspective view of the first guide tube 546 and the second guide tube 547.
  • the first and the second guide tubes 546, 547 each has an inner edge bent by 90°in a bending direction and an outer edge bent in several times.
  • a first mixing tube 545 which is connected to the ends of the first and the second guide tubes 546, 547, has a height corresponding to a sum of heights of the first guide tube 546 and the second guide tube 547.
  • the first mixing tube 545 has an upper surface connected to an upper surface of the first guide tube 546 and a lower surface connected to a lower surface of the second guide tube 547.
  • the first mixing tube 545 is a single tube so that it mixes the first polarizations traveling from the first guide tube
  • the first mixing tube 545 is larger than the first and the second guide tubes 546,
  • step 547 in view of its horizontal width and its vertical width, and at least one step is formed in a horizontal direction and at least one another step is formed in a vertical direction, both being formed along a lengthwise direction of the first mixing tube 545, such that the width of the first mixing tube 545 is enlarged.
  • steps may be formed.
  • first polarizations enter into the first and the second waveguides 535, 540 of the first polarization guide 530 from the polarization filtering units 520 through the slot 513, the first polarizations travel along the upper area and the lower area which are formed by the first split plate 536 and the second split plate 537 of the first waveguide 535.
  • the first polarizations incident from the opposite ends of the first waveguide 535 meet and are mixed at the middle area of the first waveguide 535 i.e. at the first protrusion 539, and the mixed first polarizations travel toward the first guide tube 546.
  • the first polarizations traveling around the upper areas of the first split plate 536 and the second split plate 537 moves toward the first guide tube 546 in advance, and then, the first polarizations mixed by the first cut-off part 538 formed in the middle area of the first split plate 536 are guided into the first guide tube 546, so that the first polarizations can easily move.
  • the first polarizations traveling along the upper area and the lower area of the third split plate 541 and the fourth split plate 542 in the second waveguide 540 meet and are mixed at the second protrusion 544, and then are guided into the second guide tube 547 by the second cutoff part 543 so that the first polarization can easily move.
  • the first polarizations transmitted from the first waveguide 535 and the second waveguide 540 to the first guide tube 546 and the second guide tube 547 are mixed in the first mixing tube 545.
  • the first waveguide 535 and the second waveguide 540 each is divided into the upper area and the lower area and the first guide tube 546 and the second guide tube 547 are located one on the other, the first polarizations have the same phase when being mixed in the first mixing tube 545 after being transmitted from the first guide tube 546 and the second guide tube 547. Consequently, the first polarizations are prevented from being deformed or disappearing due to any phase difference.
  • Fig. 18 is a perspective view of the second polarization guide of Fig. 2
  • Fig. 19 is a transparent perspective view of the second polarization guide of Fig. 18
  • Fig. 20 is a plan view of the second polarization guide of Fig. 18,
  • Fig. 21 is a bottom view of the second polarization guide of Fig. 18.
  • the second polarization guide 550 receives separate second polarizations from the polarization filtering units 520 and mixes them, and it includes a third waveguide 555 and a fourth waveguide 560 to mix the second polarizations from a pair of polarization filtering units 520, and a second mixing tube 565 connecting the third waveguide 555 and the fourth waveguide 560 to mix the second polarizations from the third waveguide 555 and the fourth waveguide 560.
  • the third waveguide 555 and the fourth waveguide 560 each has upwardly open openings formed at opposite ends thereof and connected to the polarization filtering units 520.
  • the third waveguide 555 and the fourth waveguide 560 are arranged in a perpendicular relation to the first and the second waveguides 535 and 540.
  • the third waveguide 555 has first direction change protrusions 556 formed on opposite ends thereof fluidly communicating with the polarization filtering units 520.
  • the first direction change protrusions 556 each is formed in a rectangular paral- lelepiped shape along a lengthwise direction of the third waveguide 555 and protrudes from the bottom of the third waveguide 555.
  • the second polarizations which have an electric field directivity along the narrow width of the polarization filtering unit 520, change their advancing direction at the first direction change protrusions 556.
  • First inclined surfaces 557 are formed on surfaces facing the first direction change protrusions 556 and inclined by a predetermined angle. The second polarizations, which have changed their advancing direction at the first direction change protrusions 556, are reflected on the first inclined surfaces 557.
  • a third protrusion 558 extending toward the second mixing tube 565 by a predetermined length is formed in a middle area of the third waveguide 555.
  • the second polarizations reflected on the first inclined surfaces 557 at the opposite ends of the third waveguide 555 meet and are mixed at the third protrusion 558, and then advance toward the second mixing tube 565.
  • the fourth waveguide 560 is formed in the same shape as that of the third waveguide 555. That is, the fourth waveguide 560 has second direction change protrusions 561 formed at opposite ends thereof fluidly communicating with the polarization filtering units 520. Second incline surfaces 562 are formed on surfaces facing the second direction change protrusions 561 and inclined by a predetermined angle, and a fourth protrusion 563 extending across the length of the fourth waveguide 560 to a predetermined length is formed in a middle area of the fourth waveguide 560.
  • the second polarizations which have entered into the fourth waveguide 560 change their advancing direction at the second direction change protrusions 561, are reflected on the second inclined surfaces 562 and then advances toward the fourth protrusion 563.
  • the second polarizations from the opposite ends of the fourth waveguide 560 meet at the fourth protrusion 563 and advance toward the second mixing tube 565.
  • the frequency of the second polarizations which enter into or exits from the second polarization guide 550 can be adjusted according to thicknesses and lengths of the third and the fourth protrusions 558, 563 and widths and heights of the first and the second inclined surfaces 557, 562.
  • the second mixing tube 565 is formed between the third waveguide 555 and the fourth waveguide 560 in parallel with them, and is perpendicular to the first mixing tube 545. Accordingly, the second main opening 568 formed at one end of the second mixing tube 565 is perpendicular to the first main opening 548.
  • a fifth protrusion 566 is formed on the other end of the second mixing tube 565, facing the second main opening 568, and protrudes along the lengthwise direction of the third and the fourth waveguides 555, 560. The second polarizations from the third and the fourth waveguides 555, 560 meet and are mixed at the fifth protrusion 566 and then advance toward the second main opening 568 and exits therefrom.
  • a first protruding piece 559 is formed in a conjunction area where the second mixing tube 565 and the third and the fourth waveguides 555, 560 join together and it protrudes from opposite side walls inwards to narrow a width of the conjunction area.
  • a second protruding piece 567 is formed at a side of the second mixing tube 565 and protrudes from opposite side walls along a lengthwise direction of the second mixing tube 565.
  • the second mixing tube 565 is able to change a frequency band of an incoming or outgoing signal according to a length and a thickness of the fifth protrusion 566, and also is able to improve antenna performance due to the presence of the first and the second protruding pieces 559, 567.
  • Fig-22 is a perspective view of a T-shaped branch tube applicable to the present invention.
  • the T-shaped branch tube is applicable to a conjunction area between the first waveguide 535 and the first guide tube 546 of the first polarization guide, a conjunction area between the second waveguide 540 and the second guide tube 547, a conjunction area between the third waveguide 555 and the second mixing tube 565 of the second polarization guide 550, a conjunction area between the fourth waveguide 560 and the second mixing tube 565, and the second mixing tube 565.
  • the T-shaped branch tube has a port 1, a port 2, and a port 3.
  • the ports 1 and 2 are placed in a straight line and in perpendicular relation to the port 3.
  • the ports 1 and 2 each have a step such that a width thereof becomes gradually narrower toward the port 3.
  • a protrusion is formed between the ports 1 and 2.
  • the port 3 has a step such that a width thereof becomes gradually broader toward an end of the port 3.
  • the step formed on each of the ports 1, 2, and 3 may be a single step or a plurality of steps, and a length or a thickness of the protrusion is adjustable.
  • first polarizations which have the same electric field directivity as the wider width of the polarization filtering unit 520, do not pass through the polarization filtering unit 520 and instead enter into the first polarization guide 530 through the slot 513 formed between the pair of shielding screens 511 of the polarization filtering unit 520.
  • second polarizations which have the same electric field directivity as the narrower width of the polarization filtering unit 520, move down along the polarization filtering unit 520 and enter into the second polarization guide 550.
  • the first polarizations traveling along the first and the second waveguides 535, 540 meet at the first protrusion 539 formed in the middle area of the first waveguide 535 and advance toward the first guide tube 546, and they also meet at the second protrusion 544 formed in the middle area of the second waveguide 540 and advance toward the second guide tube 547.
  • the first polarizations traveling along the first guide tube 546 and the second guide tube 547 are mixed at the first mixing tube 545 and then are discharged through the first main opening 548.
  • the polarization filtering units 520 change their advancing direction due to the first and the second direction change protrusions 556, 561 at the opposite ends of each of the third and the fourth waveguides 555, 560. Then, the second polarizations are reflected on the first and the second inclined surfaces 557, 562 formed on the surfaces facing the first and the second direction change protrusions 556, 561 and travel along the third and the fourth waveguides 555, 560.
  • the second polarizations traveling along the third waveguide 555 meet and are mixed at the third protrusion 558 and then advance toward the second mixing tube 565
  • the second polarizations traveling along the fourth waveguide 560 meet and are mixed at the fourth protrusion 563 and then advance toward the second mixing tube 565.
  • the second polarizations provided from the third waveguide 555 and the fourth waveguide 560 are mixed with each other in the second mixing tube 565 by the fifth protrusion 566 and are discharged to the outside through the second main opening 568.
  • the second polarizations incident on the second mixing tube 565 are separated by the fifth protrusion 566 and are guided into the third and the fourth waveguides 555, 560.
  • the second polarizations are separated once again in the third and the fourth waveguides 555, 560 by the third and the fourth protrusions 558, 563, and the separated second polarizations are reflected on the first and the second inclined surfaces 557, 562 and provided to the first and the second direction change protrusions 556, 561.
  • the second polarizations change their advancing direction toward the polarization filtering units 520 due to the presences of the first and the second direction change protrusions 556, 561 and travel up through the polarization filtering units 520.
  • the first polarizations incident on the first mixing tube 545 are separated into the first guide tube 546 and the second guide tube 547 and are transmitted to the first and the second waveguides 535, 540, respectively.
  • the first polarizations are separated in the first and the second waveguides 535, 540 due to the first and the second protrusions 539, 544 and travel toward the respective openings.
  • the first polarizations emitted from the openings to the respective polarization filtering units 520 are combined with the second polarizations from the second polarization guide 550 and are radiated to the air through the inclined parts 515.
  • Fig. 23 is an exploded perspective view illustrating layers constituting the horn array antennal for dual linear polarization according to the exemplary embodiment of the present invention in the unit of antenna.
  • the horn array antenna for dual linear polarization is fabricated by forming first through fifth layers separately as shown in Fig. 23 and then depositing the layers one another.
  • the first layer 600 is formed of the splitter 570 having a plurality of ribs 575 which are arranged at regular intervals along a column direction and a row direction.
  • the ribs 575 are arranged such that the splitter 570 of the first layer 600 is split into sixteen (16) areas.
  • Fig. 24 is a plan view of the second layer of Fig. 23 and Fig. 25 is a perspective view of the second layer.
  • the plurality of horns 510 are formed on the second layer 650 and the inclined parts
  • the inner openings are formed adjacent to a bottom of the first layer 600.
  • the pair of protrusion guides 518a, 518b is formed on the inclined parts 515 and the ledges 517 is formed on the inner opening.
  • Fig. 26 is a plan view of a third upper layer of Fig. 23
  • Fig. 27 is a perspective view of the third upper layer
  • Fig. 28 is a bottom view of the third upper layer.
  • the third upper layer 700 forms upper areas of the first and the second waveguides
  • the bending protrusions 512 and the shielding screens 511 are formed inside the polarization filtering units 520.
  • the third upper layer 700 On a bottom surface of the third upper layer 700 are formed upper areas of the first and the second waveguides 535, 540 of the first polarization guide 530, an upper area of the first guide tube 546 connected to the first waveguide 535, an upper area of the first mixing tube 545, and the polarization filtering units 520.
  • Fig. 29 is a perspective view of the third lower layer of Fig. 23
  • Fig. 30 is a perspective view of the third lower layer of Fig. 23
  • Fig. 31 is a bottom view of the third lower layer of Fig. 23.
  • On a plane of the third lower layer 750 are formed the first through the fourth split plates 536, 537, 541, 542 of the first and the second waveguides 535, 540, a lower surface of the first guide tube 546, the first mixing tube 545, and the polarization filtering units 520, and on a bottom of the third lower layer 750 are formed the first through the fourth split plates 536, 537, 541, 542 and the second polarization filtering units 520.
  • the fourth upper layer 800 forms lower areas of the first and the second waveguides 535, 540 of the first polarization guide 530 and the second guide tube 547 in registry with a fourth lower layer 850.
  • On a plane of the fourth upper layer 800 are formed the first through fourth split plates 536, 537, 541, 542, the polarization filtering units 520, and the first mixing tube
  • Fig. 35 is a plan view of the fourth lower layer of Fig. 23
  • Fig. 36 is a perspective view of the fourth lower layer of Fig. 23
  • Fig. 37 is a bottom view of the fourth lower layer of Fig. 23.
  • On a plane of the fourth lower layer 850 are formed the first and the second waveguides 535, 540, a lower surface of the second guide tube 547, the first mixing tube 545, and the polarization filtering units 520.
  • Fig. 38 is a plan view of a fifth upper layer of Fig. 23
  • Fig. 39 is a perspective view of the fifth upper layer of Fig. 23
  • Fig. 40 is a bottom view of the fifth upper layer of Fig. 23.
  • the fifth upper layer 900 forms the second polarization guide 550 in registry with a fifth lower layer 950.
  • Fig. 41 is a plan view of the fifth lower layer of Fig. 23, and Fig. 42 is a perspective view of the fifth lower layer of Fig. 23.
  • Fig. 950 On a plane of the fifth lower layer 950 are formed lower areas of the third and the fifth waveguides 555, 560 and a lower area of the second mixing tube 565.
  • FIGs. 43 and 44 are bottom perspective views of an example of arrangement of the first polarization guides of the horn array antenna for dual linear polarization according to the exemplary embodiment of the present invention.
  • the horn array antenna for dual linear polarization consists of twenty five (25) antenna units which are arranged in a row direction and a column direction five by five. Accordingly, the horn array antenna for dual linear polarization includes hundred (100) horns 510, twenty five (25) first polarization guides 530, and twenty five (35) second polarization guides 550.
  • the number of antenna units is variable according to the designs of the horn array antenna.
  • the twenty five (25) first polarization guides 530 are connected to one another through a symmetrical branch tube or asymmetrical branch tube formed in a T-shape and discharge the first polarizations through a first polarization discharge outlet 840 formed on one side of the horn array antenna.
  • a first polarization guide-1 530-1 through a first polarization guide-5 530-5, a first polarization guide-6 530-6 through a first polarization guide- 10 530-10, a first polarization guide- 11 530-11 through a first polarization guide- 15 530-15, a first polarization guide-16 530-16 through a first polarization guide-20 530-20, and a first polarization guide-21 530-21 through a first polarization guide-25 530-25 are arranged in sequence 5 by 5 such that lines are formed parallel to one another.
  • the first mixing tube 545 of the first polarization guide-1 530-1 and the first mixing tube 545 of the first polarization guide-2 530-2 are bent in an L-shape such that their respective first main openings 548 face each other, and a T-shaped first symmetrical branch tube-1 801 is connected to the ends of the first main openings 548.
  • the first symmetrical branch tube-1 801 is bent two times to be in the shape of " ⁇ " and to surround the first polarization guide-1 530-1.
  • the first symmetrical branch tube-1 801 has steps formed in a port 1 and a port 1 which are connected to the first polarization- 1 530-1 and the first polarization guide-2 530-2, such that the first symmetrical branch tubeOl 801 is narrower than the first polarization guide-1 530-1 and the first polarization guide-2 530-2 at the ports 1 and 2.
  • a step is also formed in a port 3 such that the first symmetrical branch tube-1 801 is narrower than a tube connected to the port 3.
  • a straight type tube connecting the ports 1 and 2 has a guide screen formed at a middle area thereof and protruding inwardly from an inner wall.
  • the shape of the first symmetrical branch tube-1 801 is applied to a first symmetrical branch tube-2 802 through a first symmetrical branch tube-16 816.
  • the first polarization guide-6 530-6 and the first polarization guide-7 530-7 are arranged such that ends of their respective first mixing tubes 545 face each other and are connected to each other through the first symmetrical branch tube-3 803.
  • the first polarization guide- 11 530- 11 and the first polarization guide- 12 530-12 are arranged parallel with the first polarization guide-6 530-6 and the first polarization guide-7 530-7, and ends of their respective first mixing tubes 545 are connected to each other through the first symmetrical branch tube-5 805.
  • the first symmetrical branch tube-3 803 and the first symmetrical branch tube-5 805 are connected to each other at their ends through the first symmetrical branch tube-4 804.
  • the first symmetrical branch tube-4 804 is bent in the shape of "D" to surround the first polarization guide-6 530-6.
  • first asymmetrical branch tube 1 831 is connected to each other through a first asymmetrical branch tube 1 831.
  • the first asymmetrical branch tube-1 831 is formed in the shape of "T" and steps are formed in ports 1, 2, 3 of the first asymmetrical branch tube- 1 831 such that the ports 1, 2, 3 are narrower than a tube connected to the ports 1, 2, 3.
  • a pair of width adjusting protrusions 839a which protrude from an upper surface and a lower surface of a lengthwise direction on an area where the step is formed, to reduce a width.
  • a straight type tube connecting the ports 1 and 2 has a guide screen 839b formed in a middle area of the straight type tube and protruding inwardly from an inner wall.
  • the port 3 of the first asymmetrical branch tube-1 831 extends between the first polarization guide- 1 530-1 and the first polarization guide-6 530-6.
  • the first symmetrical branch tube-1 801 provides the first asymmetrical branch tube- 1 831 connected thereto with the first polarizations from the first polarization guide- 1 530-1 and the first polarization guide-2 530-2
  • the first symmetrical branch tube-4 804 provides the first asymmetrical branch tube-1 831 with first polarizations from the first polarization guide-6 530-6, the first polarization guide-7 530-7, the first polarization guide-11 530-11, and the first polarization guide-12 530-12.
  • the first asymmetrical branch tube-1 831 receives the first polarizations from the two (2) first polarization guides 530 through the port 1, while receiving the first polarizations from the four (4) first polarization guides 530 through the port 2. Accordingly, the first asymmetrical branch tube-1 831 receives the first polarizations through the port 1 and the port 2 in the ratio of 1:2, and the pair of width adjusting protrusions 839a is for preventing the first polarizations from being deformed due to this asymmetrical ratio of the inflow amounts of the first polarizations through the ports 1 and 2. This shape of the first asymmetrical branch tube-1 831 is applied to a first asymmetrical branch tube-2 832 through a first asymmetrical branch tube-8 838.
  • the first mixing tube 545 of the first polarization guide-3 530-3 and the first mixing tube 545 of the first polarization guide-4 530-4 are bent in the shape of "T" such that their respective main openings 548 face each other, and the T-shaped first symmetrical branch tube-2 802 is connected to the ends of the first mixing tubes 545.
  • the first symmetrical branch tube-2 802 has an end bent toward the first polarization guide-4 530-4.
  • the first mixing tube 545 of the first polarization guide-5 530-5 is bent two times toward the first symmetrical branch tube-2 802 and is connected to the first symmetrical branch tube-2 802 through the first asymmetrical branch tube-5 835.
  • the first polarization guide-8 530-8 and the first polarization guide-9 530-9 are arranged such that their respective first mixing tubes 545 face each other, and the first mixing tube 545 of the first polarization guide-8 530-8 and the first mixing tube 545 of the first polarization guide-9 530-9 are connected to each other through the first symmetrical branch tube-6 806.
  • the first polarization guide-13 530-13 and the first polarization guide- 14 530-14 are arranged parallel with the first polarization guide-8 530-8 and the first polarization guide-9 530-9, and the first mixing tube 545 of the first polarization guide-13 530-13 and the first mixing tube 545 of the first polarization guide-14 530-14 are connected to each other through the first symmetrical branch tube- 8 808.
  • the first symmetrical branch tube-6 806 and the first symmetrical branch tube-8 808 are connected to each other through the first symmetrical branch tube-7 807.
  • the first symmetrical branch tube-7 807 has a port 3 extending toward the exterior of the horn array antenna for dual linear polarization.
  • the first mixing tubes 545 of the first polarization guide-10 530-10 and of the first polarization guide- 15 530-15 are bent in the shape of "L" toward each other and then they are connected to each other through the first symmetrical branch tube-9 809.
  • the first symmetrical branch tube-9 809 is connected to the first symmetrical branch tube-7 807 through the first asymmetrical branch tube-7 837.
  • the first asymmetrical branch tube-7 837 has a port 1 that is connected to the first symmetrical branch tube-7 807 and thus receives the first polarizations from the first polarization guide-8 530-8, the first polarization guide-9 530-9, the first polarization guide-13 530-13, and the first polarization guide-14 530-14, and also receives the first polarizations from the first polarization guide-10 530-10 and the first polarization guide- 15 530-15 through a port 2.
  • the first asymmetrical branch tube-7 837 receives the first polarizations through the port 1 and the port 2 in ration of 2: 1, and a pair of width adjusting protrusions 839a is formed in the port 2 of the first asymmetrical branch tube-7 837.
  • first asymmetrical branch tube-6 836 is connected to each other through the first asymmetrical branch tube-6 836, and the first asymmetrical branch tube-6 836 extends toward the first asymmetrical branch tube-1 831 and is connected to the first asymmetrical branch tube-1 831 through the first asymmetrical branch tube-2 832.
  • the first asymmetrical branch tube-2 832 receives the first polarizations from the six (6) first polarization guides, i.e., from the first polarization guide- 1 530-1, the first polarization guide-2 530-2, the first polarization guide-6 530-6, the first polarization guide-7 530-7, the first polarization guide- 11 530-11, and the first polarization guide- 12 530-12, through the first asymmetrical branch tube-1 831, whereas the first asymmetrical branch tube-2 832 receives the first polarizations from the nine (9) first polarization guide, i.e., from the first polarization guide-3 530-3 through the first polarization guide-5 530-5, the first polarization guide-8 530-8 through the first polarization guide- 10 530-10, and the first polarization guide- 13 530-13 through the first polarization guide-15 530-15, through the first asymmetrical branch tube-6 836. That is, the first asymmetrical branch
  • the first polarization guide-16 530-16 and the first polarization guide-17 530-17 are arranged such that ends of their respective first mixing tubes 545 face each other, and the ends of the first mixing tubes 545 of the first polarization guide-16 530-16 and of the first polarization guide-17 530-17 are connected to each other through the first symmetrical branch tube- 10 810.
  • the first polarization guide-21 530-21 and the first polarization guide-22 530-22 are arranged parallel to the first polarization guide-16 530-16 and the first polarization guide-17 530-17, respectively, and ends of their respective first mixing tubes 545 are connected to each other through the first symmetrical branch tube- 12 812.
  • first symmetrical branch tube- 10 810 and the first symmetrical branch tube- 12 812 are connected to each other at their respective ends through the first symmetrical branch tube- 11 811.
  • the first symmetrical branch tube- 11 811 has one end that is bent two times in the shape of "D " to surround the first polarization guide-16 530-16, and then extends between the first polarization guide- 11 530-11 and the first polarization guide-16 530-16.
  • the first polarization guide-18 530-18 and the first polarization guide-19 530-19 are arranged such that ends of their respective first mixing tubes 545 face each other, and the ends of the first mixing tubes 545 of the first polarization guide- 18 530- 18 and of the first polarization guide-19 530-19 are connected to each other through the first symmetrical branch tube 13 813.
  • the first polarization guide-23 530-23 and the first polarization guide-24 530-24 are arranged parallel to the first polarization guide- 18 530-18 and the first polarization guide-19 530-19, respectively, and ends of their respective first mixing tubes are connected to each other through the first symmetrical branch tube- 15 815.
  • the first symmetrical branch tube- 13 813 and the first symmetrical branch tube-15-815 are connected to each other at their respective ends through the first symmetrical branch tube- 14 814.
  • the first polarization guide-20 530-20 and the first polarization guide-25 530-25 are arranged such that their respective mixing tubes 545 are bent in the shape of "L" toward each other and are connected to each other through the first symmetrical branch tube-16 816.
  • first asymmetrical branch tube- 8 838 receives the second polarizations through the first symmetrical branch tube- 16 816 and the first symmetrical branch tube-14 814 in the ratio of 1:2, and a pair of width adjusting protrusions is formed in a port 2 of the first asymmetrical branch tube- 8 838.
  • the first asymmetrical branch tube-8 838 is bent along a periphery of the first polarization guide- 19 530-19 and is connected to the first symmetrical branch tube- 11 811 through the first asymmetrical branch tube-4 834.
  • a pair of width adjusting protrusions 839a is formed in a port 1 of the first asymmetrical branch tube-4 834, and the first polarizations provided to the port 1 and a port 2 have a ration of 2:3.
  • the first asymmetrical branch tube-3 833 receives the first polarizations from the ten (10) first polarization guide 530 through a port 1 and receives the first polarizations from the fifteen (15) first polarization guide 530 through a port 2.
  • the first polarizations provided through the port 1 and the port 2 have a ratio of 2:3, and a pair of width adjusting protrusions 839a is formed in the port 1.
  • the first polarization discharge outlet 840 is formed on a port 3 of the first asymmetrical branch tube-3 833 to discharge the first polarizations therethrough.
  • Figs. 45 and 46 are bottom perspective views of an example of arrangement of the second polarization guides of the horn array antenna for dual linear polarization according to the exemplary embodiment of the present invention.
  • the twenty five (25) second polarization guides 550 are connected to one another through a T-shaped symmetrical branch tube or asymmetrical branch tube, and discharge second polarizations toward a second polarization discharge outlet 940 formed on a side of the horn array antenna.
  • a second polarization guide- 1 550-1 through a second polarization guide-5 550-5, a second polarization guide-6 550-6 through a second polarization guide-10 550-10, a second polarization guide-11 550-11 through a second polarization guide- 15 550-15, a second polarization guide-16 550-16 through a second polarization guide-20 550-20, and a second polarization guide-21 550-21 through a second polarization guide-25 550-25 are arranged in sequence 5 by 5 such that lines are formed parallel to one another.
  • the second mixing tube 565 of the second polarization guide- 1 550-1 and the second mixing tube 565 of the second polarization guide-6 550-6 are bent in the shape of "L" such that their respective main openings 568 face each other, and a T-shaped second symmetrical branch- 1 901 is connected to ends of the second mixing tubes 565.
  • the second symmetrical branch tube-1 901 has steps formed in ports 1 and 2 thereof such that the areas of the ports 1 and 2 connected to the second polarization guide- 1 550-1 and the second polarization guide-6 550-6 are narrower than the second polarization guide- 1 550-1 and the second polarization guide 6-550-6, and also a step is formed in a port 3 such that the first symmetrical tube is narrower than a tube connected to the port 3.
  • a straight type tube connecting the port 1 and the port 2 has a guide screen protruding inwardly from an inner wall of a middle area thereof.
  • the shape of the second symmetrical branch tube-1 901 is applied a second symmetrical branch tube-2 902 through a second symmetrical branch tube- 16 916.
  • the second polarization guide-2 550-2 and the second polarization guide-3 550-3 are arranged such that ends of their respective second mixing tubes 565 face each other, and the ends of the second mixing tubes 565 of the second polarization guide-2 550-2 and of the second polarization guide-3 550-3 are connected to each other through the second symmetrical branch tube-2 902.
  • the second polarization guide-7 550-7 and the second polarization guide-8 550-8 are arranged parallel to the second polarization guide-2 550-2 and the second polarization guide-3 550-3, respectively, and ends of their respective second mixing tubes 565 are connected to each other through the second symmetrical branch tube-4 904.
  • the second symmetrical branch tube-2 902 and the second symmetrical branch tube-4 904 are connected to each other at their respective ends through the second symmetrical branch tube-3 903.
  • the second symmetrical branch tube-1 901 and the second symmetrical branch tube-3 903 are arranged such that their ends face each other and are connected to each other through a second asymmetrical branch tube- 1 931.
  • the second asymmetrical branch tube-1 931 is formed in the shape of "T" and has the steps formed in the ports 1, 2, 3 thereof to be narrower than tubes connected to the respective ports.
  • a straight type tube connecting the ports 1 and 2 has a guide screen 839b protruding inwardly from an inner wall of a middle area of the straight type tube, and a pair of width adjusting protrusions 839a is formed in the port 2 connected to the second symmetrical branch tube-1 901.
  • the pair of width adjusting protrusions 839a protrudes from an upper surface and a lower surface of a lengthwise direction to reduce a width.
  • the port 3 of the second asymmetrical branch tube-1 931 extends between the second polarization guide-6 550-6 and the second polarization guide-7 550-7 and then is bent toward the second polarization guide-7 550-7 and extends.
  • the second symmetrical branch tube-1 901 provides the second asymmetrical branch tube- 1 931 connected thereto with second polarizations from the second polarization guide- 1 550-1 and the second polarization guide-6 550-6
  • the second symmetrical branch tube-3 903 provides the second asymmetrical branch tube-1 931 with second polarizations from the second polarization guide-2 550-2, the second polarization guide-3 550-3, the second polarization guide-7 550-7, and the second polarization guide-8 550-8.
  • the second asymmetrical branch tube-1 931 receives the second polarizations from the four (4) second polarization guides through a port 1, while receiving the second polarizations from the two (2) second polarization guides through a port 2. Accordingly, the second asymmetrical branch tube-1 931 receives the second polarizations through the port land the port 2 in the ratio of 2: 1, and the pair of width adjusting protrusion 839a is formed to prevent the second polarizations from being deformed due to an asymmetrical ratio in the inflow amounts of the second polarizations through the ports 1 and 2.
  • the shape of the second asymmetrical branch tube- 1 931 is applied to a second asymmetrical branch tube-2 932 through a second asymmetrical branch tube-8 938.
  • the second polarization guide-4 550-4 and the second polarization guide-5 550-5 are arranged such that their respective second mixing tubes 565 face each other, and the second mixing tubes 565 of the second polarization guide-4 550-4 and of the second polarization guide-5 550-5 are connected to each other through the second symmetrical branch tube-5 905.
  • the second polarization guide-9 550-9 and the second polarization guide- 10 550-10 are arranged parallel to the second polarization guide-4 550-4 and the second polarization guide-5 550-5, respectively, and the second mixing tubes 565 of the second polarization guide-9 550-9 and of the second polarization guide-10 550-10 are connected to each other through the second symmetrical branch tube-7 907.
  • the second symmetrical branch tube-5 905 and the second symmetrical branch tube-7 907 are connected to each other through the second symmetrical branch tube-6 906.
  • the second symmetrical branch tube-6 906 has a port 3 that face the outline of the horn array antenna for dual linear polarization and is bent two times to be in a "D" shape and surround the second polarization guide-10 550-10.
  • the second asymmetrical branch tube-1 931 and the second symmetrical branch tube-6 906 are connected to the second asymmetrical branch tube-5 935, and the second asymmetrical branch tube-5 935 receives the second polarizations from the six (6) second polarization guides, which includes the second polarization guide- 1 550-1 through the second polarization guide-3 550-3 and the second polarization guide-6 550-6 through the second polarization guide-8 550-8, through the second asymmetrical branch tube- 1 931, while receiving the second polarizations from the four (4) second polarization guides, which includes the second polarization guide-5 550-4, the second polarization guide-5 550-5, the second polarization guide-9 550-9, and the second polarization guide-10 550-10, through the second symmetrical branch tube-6 906.
  • the second asymmetrical branch tube-5 935 receives the second polarizations through a port 1 and a port 2 in the ratio of 2:3, and accordingly, a pair of width adjusting protrusions 839a is formed in the port 1.
  • the width adjusting protrusions 839a differs from those of the second asymmetrical branch tube-1 931 in their widths. This is because that the second asymmetrical branch tube-1 931 receives the second polarizations through the ports 1 and 2 in the ratio of 1 :2.
  • the inflow amounts or ratio of the second polarizations can be adjusted by changing the widths or lengths of the width adjusting protrusions 839a.
  • the second polarization guide- 11 550-11 and the second polarization guide-16 550-16 are arranged such that their respective second mixing tubes 565 are bent toward each other in the shape of "L" and are connected to each other through the second symmetrical branch tube-8 908.
  • the second polarization guide- 17 550-17 and the second polarization guide-18 550-18 are arranged parallel to the second polarization guide-12 550-12 and the second polarization guide-13 550-13, and ends of their second mixing tubes 565 are connected to each other through the second symmetrical branch tube- 11 911. Ends of the second symmetrical branch tube-9 909 and the second symmetrical branch tube- 11 911 are connected to the second symmetrical branch tube- 10 910.
  • the second symmetrical branch tube-8 908 and the second symmetrical branch tube- 10 910 are arranged such that their respective ends face each other and are connected to each other through the second asymmetrical branch tube-2 932.
  • the second asymmetrical branch tube-2 932 receives the second polarization from the four (4) second polarization guides 550, which includes the second polarization guide-12 550-12, the second polarization guide-13 550-13, the second polarization guide-17 550-17, and the second polarization guide-18 550-18, through a port 1, and also receives the second polarizations from the two (2) second polarization guides 550, which includes the second polarization guide- 11 550- 11 and the second polarization guide-16 550-16, through a port 2. That is, the second asymmetrical branch tube-2 932 receives the second polarizations through the port 1 and the port 2 in the ratio of 2: 1, and a pair of width adjusting protrusions 839a is formed in the port 2.
  • the second symmetrical branch tube- 15 915 has an end that is bent and then extends toward the second polarization guide-21 550-21, and the second mixing tube 565 of the second polarization guide-21 550-21 is bent in the shape of "D" and extends toward the second symmetrical branch tube- 15 915.
  • the second symmetrical branch tube- 15 915 and the second polarization guide-21 550-21 are connected to each other through the second asymmetrical branch tube-4 934.
  • the second asymmetrical branch tube-2 932 and the second asymmetrical branch tube-4 934 extend toward each other and are connected to each other through the second asymmetrical branch tube-3 933.
  • the second asymmetrical branch tube-2 932 provides the second asymmetrical branch tube-3 933 with the second polarizations from the second polarization guide- 11 550-11 through the second polarization guide- 13 550-13 and the second polarization guide-16 550-16 through the second polarization guide-18 550-18
  • the second asymmetrical branch tube-4 934 provides the second asymmetrical branch tube-3 933 with the second polarizations from the second polarization guide-21 550-21 through the second polarization guide-23 550-23. That is, the second asymmetrical branch tube-3 933 receives the second polarization through a port 1 and a port 2 in the ratio of 2: 1, and accordingly, a pair of width adjusting protruding 839a is formed in the port 2.
  • the second polarization guide-19 550-19 and the second polarization guide- 20 550-20 are arranged parallel to the second polarization guide-14 550-14 and the second polarization guide-15 550-15, respectively, and the second mixing tubes 565 of the second polarization guide-19 550-19 and of the second polarization guide-20 550-20 are connected to each other through the second symmetrical branch tube- 14 914.
  • the second symmetrical branch tube-12 912 and the second symmetrical branch tube-14 914 are connected to each other through the second symmetrical branch tube- 13 913.
  • the second symmetrical branch tube- 13 913 has a port 3 that extends toward the outline of the horn array antenna for dual linear polarization and is bent in the shape of "L" to surround the second polarization guide- 20 550-20.
  • the second symmetrical branch tube- 16 916 is bent two times in the shape of "D" to surround the second polarization guide-25 550-25, and the second symmetrical branch tube- 16 916 is connected to the second symmetrical branch tube 13-913 through the second asymmetrical branch tube-8 938.
  • the second asymmetrical branch tube-8 938 receives the second polarizations from the second polarization guide-24 550-24 and the second polarization guide-25 550-25 through a port 1, and also receives the second polarizations from the second polarization guide- 14 550-14, the second polarization guide-15 550-15, the second polarization guide-19 550-19, and the second polarization guide-20 550-20 through a port 2. Accordingly, the second asymmetrical branch tube-8 938 receives the second polarizations through the port 1 and the port 2 in the ratio of 1:2, and a pair of width adjusting protrusions 839a is formed in the port 1.
  • the second asymmetrical branch tube-8 938 and the second asymmetrical branch tube-3 933 are connected to each other through the second asymmetrical branch tube-7 937, and the second asymmetrical branch tube-7 937 receives the second polarizations from the six (6) second polarization guides 550 through a port 2 connected to the second asymmetrical branch tube-8, and receives the second polarizations from the nine (9) second polarization guide 550 through a port 1 connected to the second asymmetrical branch tube-3 933. That is, the second asymmetrical branch tube-7 937 receives the second polarizations through the port 1 and the port 2 in the ratio of 3:2, and accordingly, a pair of width adjusting protrusions 839a is formed in the port 2.
  • the second asymmetrical branch tube-5 935 and the second asymmetrical branch tube-7 937 are connected to each other through the second asymmetrical branch tube-6 936.
  • the second asymmetrical branch tube-6 936 receives the second polarizations from the ten (10) second polarization guides 550 through a port 1 connected to the second asymmetrical branch tube-5 935, and also receives the second polarizations from the fifteen (15) second polarization guides 550 through a port 2 connected to the second asymmetrical branch tube-7 937.
  • the second asymmetrical branch tube- 6 936 receives the second polarizations through the port 1 and the port 2 in the ratio of 2:3, and a pair of width adjusting protrusions 839a is formed in the port 1.
  • the second polarization discharge outlet 940 is formed in a port 3 of the second asymmetrical branch tube-6 936 to allow the second polarizations to enter entered or to be emitted therethrough.
  • the horn array antenna for dual linear polarization 501 has the horns 510 having the ledges 517 and the protruding guides 518a, 518b, thereby reducing the height of the horns 510 and also maintaining the efficiency of the antenna 501.
  • the second polarization guide 550 has a width larger than its height so that the height of the second polarization guide 550 can be reduced and the size of the horn array antenna for dual linear polarization 501 as a whole can be compact-sized.
  • the first and the second polarizations were described with reference to an electric field in the above embodiments, they can be applied to a magnetic field.
  • the above-described embodiment is merely an example of fabricating the horn 510, the first polarization guide 530, and the second polarization guide 550. At least two of the horn 510, the first polarization guide 530, and the second polarization guide 550 may be fabricated at one time if necessary, for example, by an injection molding. Also, the numbers of layers in fabricating the horn 510, the first polarization guide 530, and the second polarization guide 550 are not limited those illustrated in Figs. 23 through 42.

Abstract

L'invention porte sur une antenne cornet de type réseau à double polarisation linéaire. L'antenne comporte: un cornet qui guide les ondes électromagnétiques entrantes ou sortantes; un premier guide de polarisation dont une première extrémité est connectée au cornet et qui présente plusieurs trajectoires adjacentes de guidage d'une première polarisation et d'une deuxième polarisation dont une extrémité, connectée au cornet, et parallèle au premier guide de polarisation, guide une deuxième polarisation dont la direction du champ électrique est perpendiculaire à la première polarisation. Cette conception permet d'accroître les performances de l'antenne tout en en réduisant la taille.
PCT/KR2008/001008 2007-02-21 2008-02-21 Antenne cornet de type réseau à double polarisation linéaire WO2008102987A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2007-0017560 2007-02-21
KR20070017560 2007-02-21
KR10-2007-0021929 2007-03-06
KR1020070021929A KR100865956B1 (ko) 2006-12-08 2007-03-06 듀얼선형편파 혼어레이 안테나

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