WO2010018896A1 - Antenne équipée d’un élément de découplage - Google Patents

Antenne équipée d’un élément de découplage Download PDF

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Publication number
WO2010018896A1
WO2010018896A1 PCT/KR2008/007252 KR2008007252W WO2010018896A1 WO 2010018896 A1 WO2010018896 A1 WO 2010018896A1 KR 2008007252 W KR2008007252 W KR 2008007252W WO 2010018896 A1 WO2010018896 A1 WO 2010018896A1
Authority
WO
WIPO (PCT)
Prior art keywords
decoupling
reflection plate
decoupling element
sub
radiation
Prior art date
Application number
PCT/KR2008/007252
Other languages
English (en)
Inventor
Hyung-Joon Noh
Phil-Soo Shin
Seung-Chul Lee
Ji-Hoon Kim
F. Stefan Johansson
Ingolf Larsson
Original Assignee
Ace Antenna Corp.
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 KR1020080078512A external-priority patent/KR101027374B1/ko
Priority claimed from KR1020080078509A external-priority patent/KR100983613B1/ko
Application filed by Ace Antenna Corp. filed Critical Ace Antenna Corp.
Publication of WO2010018896A1 publication Critical patent/WO2010018896A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
    • 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
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path

Definitions

  • Example embodiment of the present invention relates to an antenna, specially an array antenna, more particularly relates to an antenna for enhancing isolation characteristic and front to back ratio characteristic by using a decoupling element.
  • An antenna outputs/receives an electromagnetic wave by outputting a radiation pattern in a specific direction, and has a structure shown in below FIG. 1.
  • FIG. 1 is a perspective view illustrating schematically a common antenna.
  • an antenna includes a reflection plate 100 and a radiation element 102.
  • the radiation element 102 is located on the reflection plate 100 which operates as a ground, and has a feeding line (not shown), a feeding element 110 and dipole elements 112.
  • the radiation element 102 Certain current is applied to the dipole elements 1 12 through the feeding line and the feeding element 110, and so a given radiation pattern is outputted from the radiation element 102.
  • the radiation element 102 generates a dual polarization for two channels, i.e. ⁇ 45 ° polarization. As a result, interference may be generated between the polarizations.
  • isolation between the polarizations is not good, and so signal transmitting characteristic of the antenna may be lowered.
  • an antenna having excellent isolation characteristic has been required.
  • plural antennas are adjacently disposed in a base station.
  • radiation energy outputted from one antenna may affect to other antennas.
  • a problem exists in that characteristics of the other antenna may be lowered due to the outputted radiation energy. That is, since front to back ratio characteristic of the antenna is not good, characteristic of other antenna may be lowered. Accordingly, an antenna for enhancing a front to back ratio characteristic has been required.
  • Example embodiment of the present invention provides an antenna including a decoupling element for enhancing an isolation characteristic and a front to back ratio characteristic.
  • An antenna according to one example embodiment of the present invention includes a reflection plate; a radiation element disposed on the reflection plate; and a decoupling element configured to surround the radiation element with loop shape.
  • the decoupling element is electrically connected to the reflection plate.
  • the antenna further includes a first choke element and a second choke element disposed on both end portions of the reflection plate, wherein a part of the decoupling element is electrically connected to at least one of the choke elements.
  • the radiation element includes a feeding line; and at least one dipole element extended from the feeding line in a direction crossing over the feeding line.
  • the decoupling element surrounds the dipole elements with located between the reflection plate and the dipole elements.
  • the radiation element has a first radiation element for a first frequency band and a second radiation element for a second frequency band.
  • the second radiation element is located inside of the first radiation element, and the decoupling element surrounds the first radiation element.
  • the antenna further includes a first choke element and a second choke element disposed on both end portions of the reflection plate.
  • the radiation element includes a feeding line and dipole elements extended from the feeding line in a direction crossing over the feeding line
  • the decoupling element has a first sub-decoupling element and a second sub- decoupling element.
  • the first sub-decoupling element surrounds the dipole elements with located between the reflection plate and the dipole elements
  • the second sub-decoupling element is longitudinal- extended from the first sub-decoupling element in a direction to the reflection plate and connects electrically the first sub-decoupling element to the reflection plate and/or the choke element.
  • the dipole elements form rectangular structure, and the first sub- decoupling element has rectangular picture frame shape.
  • the antenna includes a first radiation element, a second radiation 75 element, a first decoupling element for surrounding the first radiation element and a second decoupling element for surrounding the second radiation element.
  • the second decoupling element has different structure from the first decoupling element.
  • the antenna has a first radiation element and a second radiation
  • the decoupling element includes a sub-decoupling element for surrounding the first radiation element.
  • a part of the sub-decoupling element is disposed between the radiation elements.
  • Antenna according to another example embodiment of the present invention includes a reflection plate; a radiation element disposed on the
  • reflection plate configured to have at least one dipole element; a first choke element and a second choke element disposed on both end portions of the reflection plate; and a first decoupling element located between the reflection plate and the dipole elements.
  • a first sub-decoupling element of the first decoupling element is parallel to the dipole element, and
  • a second sub-decoupling element of the first decoupling element is electrically connected to at least one of the choke elements.
  • the radiation element includes a feeding line and the dipole elements longitudinal-extended from the feeding line, and the first decoupling element is located in a first direction on the basis of the feeding 95 line.
  • the antenna further includes a second decoupling element disposed in a second direction opposed to the first direction on the basis of the feeding line and located between the dipole elements and the reflection plate.
  • the antenna has a first radiation element and a second radiation element.
  • the first decoupling element is located between the 100 radiation elements.
  • the first decoupling element includes the first sub-decoupling element disposed in parallel to the dipole elements; the second sub- decoupling element longitudinal-extended from the first sub-decoupling element in a direction crossing over the first sub-decoupling element, and 105 connected electrically to the choke element; and a third sub-decoupling element longitudinal-extended from the first sub-decoupling element in a direction crossing over the first sub-decoupling element, and connected electrically to the reflection plate.
  • An antenna according to still another example embodiment of the 110 present invention includes a reflection plate; a radiation element disposed on the reflection plate, and configured to have a plurality of dipole elements; and a first decoupling element located between the reflection plate and the dipole elements.
  • the first decoupling element includes a first sub- decoupling element disposed in parallel to a plane formed by the dipole 115 elements under the condition that the first sub-decoupling element is located between the plane and the reflection plate; and a second sub-decoupling element longitudinal-extended from the first sub-decoupling element in a direction crossing over the first sub-decoupling element, and connected electrically to the reflection plate.
  • the radiation element includes a feeding line; and dipole elements longitudinal-extended from the feeding line.
  • the first decoupling element is located in a first direction on the basis of the feeding line.
  • the antenna further includes a second decoupling element disposed in a second
  • the antenna further includes a choke element disposed on one or more of both end portions of the reflection plate.
  • the second sub- decoupling element is coupled to the reflection plate through the choke
  • An antenna according to still another example embodiment of the present invention includes a reflection plate; a radiation element disposed on the reflection plate, and configured to have a plurality of dipole elements; and a decoupling element as a conductor disposed between the reflection 135 plate and a plane formed by the dipole elements, and coupled electrically or conductively to the reflection plate, thereby enhancing an isolation characteristic or a front to back ratio characteristic.
  • An antenna according to still another example embodiment of the present invention includes a reflection plate; radiation elements disposed on
  • the reflection plate and configured to have a plurality of dipole elements; and a decoupling element as a conductor disposed between the radiation elements, and coupled electrically or conductively to the reflection plate, thereby enhancing an isolation characteristic or a front to back ratio characteristic.
  • An antenna according to still another example embodiment of the present invention includes a ground element; a radiation element configured to have a plurality of dipole elements; and a decoupling element configured to surround the radiation element.
  • the decoupling element is electrically or conductively connected to the ground element.
  • An antenna according to still another example embodiment of the present invention includes a reflection plate; a radiation element disposed on the reflection plate; and a decoupling element connected electrically to the reflection plate, and disposed around the radiation element.
  • both end portions of the decoupling element are electrically connected to the 155 reflection plate, and the decoupling element is one body type element.
  • the decoupling element includes a first sub-decoupling element coupled to the reflection plate, and disposed in a direction crossing over the reflection plate; a second sub-decoupling element coupled to the reflection plate, and disposed in a direction crossing over the reflection plate; and a
  • third sub-decoupling element configured to couple the first sub-decoupling element to the second sub-decoupling element.
  • height of the first sub-decoupling element is different from that of the second sub-decoupling element.
  • Width of the first sub-decoupling element is greater than the height
  • the decoupling element further includes a fourth sub-decoupling element longitudinal-extended from the first sub-decoupling element; and a fifth sub-decoupling element extended from a connection point of the second sub-decoupling element and the third sub-decoupling element.
  • the radiation element includes a feeding line disposed in a direction vertical to the reflection plate; and at least one dipole element extended from the feeding line in a direction parallel to the reflection plate.
  • the decoupling element is located between the reflection plate and the dipole element, and operates through a combination method or a vector-sum method.
  • the antenna further includes choke elements disposed on both end portions of the reflection plate. Here, some of the decoupling element is electrically connected to a corresponding choke element.
  • Plural decoupling elements are disposed around the radiation element, and some of the decoupling elements is coupled to a corresponding 180 choke element.
  • decoupling elements are disposed around the radiation element.
  • one or more of the decoupling elements has different structure from the other decoupling element.
  • An antenna according to still another example embodiment of the 185 present invention includes a reflection plate; a radiation element disposed on the reflection plate; and a decoupling element connected electrically to the reflection plate, and disposed around the radiation element.
  • the decoupling element includes a first sub-decoupling element longitudinal- extended from the reflection plate in a direction crossing over the reflection 190 plate; and a second sub-decoupling element longitudinal-extended from the first sub-decoupling element.
  • An angle between the second sub-decoupling element and a normal of the reflection plate is below 45°.
  • Width of the first sub-decoupling element is greater than height of the first sub-decoupling element.
  • the antenna further includes choke elements disposed on both end portions of the reflection plate.
  • the decoupling element is electrically connected to a corresponding choke element.
  • Plural decoupling elements are disposed around the radiation element.
  • one or more of the decoupling elements is different from 200 the other decoupling element.
  • An antenna according to still another example embodiment of the present invention includes a reflection plate; a radiation element disposed on the reflection plate; and a decoupling element connected electrically to the reflection plate, and disposed around the radiation element.
  • Both end portions of the decoupling element are electrically connected to the reflection plate, and the decoupling element has one body type element.
  • the antenna further includes choke elements disposed on both end
  • a part of the decoupling element is coupled to a specific choke element, and other part of the decoupling element is coupled to the reflection plate, thereby forming an electrical loop through the reflection plate, the decoupling element and the choke element.
  • An antenna according to still another example embodiment of the 215 present invention includes a reflection plate; a plurality of radiation elements disposed on the reflection plate; and a decoupling element connected electrically to the reflection plate and disposed between adjoining radiation elements, thereby enhancing an isolation characteristic of the radiation elements.
  • both end portions of the decoupling element are 220 electrically connected to the reflection plate.
  • An antenna according to still another example embodiment of the present invention includes a reflection plate; a radiation element disposed on the reflection plate; and a decoupling element connected electrically to the reflection plate, and disposed around the radiation element.
  • width of 225 the decoupling element is greater than height of the decoupling element.
  • An antenna according to one example embodiment of the present invention includes a decoupling element surrounding dipole elements of a radiation element, and thus an isolation characteristic and a front to back 230 ratio characteristic of the antenna may be enhanced. Specially, in case that a part of the decoupling element is electrically or inductively to a reflection plate, the isolation characteristic may be more enhanced.
  • An antenna according to another example embodiment of the present invention includes a rod typed decoupling element disposed between 235 radiation elements, an isolation characteristic and a front to back ratio characteristic of the antenna may be enhanced.
  • An antenna according to still another example embodiment of the present invention include a decoupling element disposed around a radiation element, an isolation characteristic of the antenna may be improved.
  • FIG. 1 is a perspective view illustrating schematically a common 245 antenna
  • FIG. 2 is a perspective view illustrating an antenna according to a first example embodiment of the present invention
  • FIG. 3 is a view illustrating schematically a structure of a radiation element used in an antenna according to one example embodiment of the 250 present invention
  • FIG. 4 is a view illustrating schematically a radiation element according to another example embodiment of the present invention.
  • FIG. 5 is a view illustrating schematically a radiation element according to still another example embodiment of the present invention.
  • FIG. 6 is a perspective view illustrating an antenna according to a second example embodiment of the present invention.
  • FIG. 7 is a perspective view illustrating structure of a decoupling element according to one example embodiment of the present invention.
  • FIG. 8 is a view illustrating a graph showing isolation characteristic of 260 an antenna according to one example embodiment of the present invention.
  • FIG. 9 is a view illustrating a graph showing a front to back ratio characteristic of an antenna according to one example embodiment of the present invention.
  • FIG. 10 is a perspective view illustrating schematically an antenna 265 according to a third example embodiment of the present invention.
  • FIG. 11 is a perspective view illustrating schematically an antenna according to a fourth example embodiment of the present invention.
  • FIG. 12 is a perspective view illustrating schematically an antenna according to a fifth example embodiment of the present invention.
  • FIG. 13 is a perspective view illustrating an antenna according to a sixth example embodiment of the present invention.
  • FIG. 14 is a view illustrating schematically a radiation element according to another example embodiment of the present invention.
  • FIG. 15 is a view illustrating a radiation element according to still 275 another example embodiment of the present invention.
  • FIG. 16 is a perspective view illustrating various decoupling elements according to one example embodiment of the present invention.
  • FIG. 17 is a perspective view illustrating various decoupling elements according to another example embodiment of the present invention.
  • FIG. 18 is a view illustrating disposition of decoupling elements according to one example embodiment of the present invention.
  • FIG. 19 is a perspective view illustrating schematically an antenna according to a seventh example embodiment of the present invention.
  • FIG. 2 is a perspective view illustrating an antenna according to a first 335 example embodiment of the present invention.
  • the antenna of the present embodiment includes a reflection plate 200, at least one radiation element 202, at least one choke element 204 and a decoupling element 206.
  • the reflection plate 200 functions as a ground and a reflector, for 340 example has a plane shape.
  • the radiation element 202 outputs a specific radiation pattern, for example outputs a dual polarization, i.e. ⁇ 45 ° polarizations.
  • This radiation element 202 includes a feeding element 210 and at least one dipole element 212.
  • the feeding element 210 provides current applied through a feeding line (not shown) to the dipole elements 212, the feeding line being disposed in a direction vertical to the reflection plate 200.
  • the dipole elements 212 generate electric fields in accordance with the applied current, and so a specific radiation pattern is outputted by 350 combination of the electric fields.
  • the dipole elements 212 are coupled to the feeding element 210, and for example four dipole elements 212 may be included in the radiation element 202.
  • the dipole elements 212 may be variously modified without limited as specific shape.
  • the choke elements 204 are formed on a given area of the reflection plate 200, e.g. both end portions under the condition that the choke elements 204 are electrically connected to the reflection plate 200 as shown in FIG. 2(A), and control a beam characteristic such as beam width, front to back ratio, etc. For example, the more the choke elements 204 become distant
  • a manager may set location of the choke elements 204 considering the width of the beam to be outputted from the antenna.
  • the choke elements 204 are not disposed on both end portions of the reflection plate 200, but one choke element 204 may be disposed on one end portion of the reflection plate 200.
  • the decoupling element 206 as a conductor surrounds the radiation element 202, particularly the dipole elements 212 as shown in FIG. 2(A),
  • the antenna is used so as to deliver a signal in a communication system, and provides two separate channels obtained by orthogonal polarization for a specific frequency or frequency band for the 375 purpose of enhancing its performance. Accordingly, it is important to maintain excellently the isolation characteristic between the channels.
  • the antenna of the present embodiment enhances the isolation characteristic between the channels by using the decoupling element 206, thereby improving the performance of the antenna.
  • the antenna of the present embodiment blocks a radiation energy delivered to a side area and a back area of the reflection plate 200, thereby minimizing the interference between the antennas.
  • the interference between the antennas is minimized by improving the front to back ratio characteristic of the antenna.
  • the decoupling element 206 is electrically or conductively connected to the reflection plate 200, and includes a first sub-decoupling element 206A and a second sub-decoupling element 206B .
  • the first sub-decoupling element 206A surrounds the dipole elements
  • the first sub- decoupling element 206A has loop shape.
  • the first sub- decoupling element 206A has rectangular shape, its center is empty, i.e. picture frame structure.
  • structure of the first sub-decoupling element 206A may be variously modified as long as the first sub-decoupling 395 element 206A surrounds the dipole elements 212.
  • the first sub- decoupling element 206A is disposed between the reflection plate 200 and the dipole elements 212, i.e. is disposed between a plane P, in which the dipole elements 212 exist, and the reflection plate 200.
  • the 400 in a direction vertical to the choke element 204 of the first sub-decoupling element 206A may be located just below the dipole elements 212, or be disposed between adjoining radiation elements 202 under the condition that the first sub-decoupling element 206A is separated from the dipole elements 212.
  • the second sub-decoupling element 206B is longitudinal-extended from the first sub-decoupling element 206A in a direction to the reflection plate 200 as shown in FIG. 2(A), and is coupled to one or more of the choke elements 204.
  • the second sub-decoupling element 206B may be directly connected to the
  • the second sub-decoupling element 206B may be connected to both of the choke element 204 and the reflection plate 200.
  • the second sub-decoupling element 206B supports the first sub- 415 decoupling element 206A, and may be variously modified as long as the second sub-decoupling element 206b is connected to the choke element 204 and/or the reflection plate 200.
  • the antenna of the present embodiment enhances the isolation characteristic and the front to back ratio characteristic by using the
  • the decoupling element 206 is disposed below the plane P, and is electrically connected to the choke element 204 and/or the reflection plate 200.
  • the decoupling element 206, the choke element 204 and the reflection plate 200 forms one electrical loop.
  • an array antenna outputs a beam in a given direction by using the radiation elements 202 shown in FIG. 2(B).
  • the decoupling elements 206 may be respectively disposed for every radiation element 202, or be disposed for only some of the radiation elements 202.
  • a first decoupling element 206- 1 is disposed for a first
  • a decoupling element for a second radiation element 206-2 does not exist, and a third decoupling element 206-2 is disposed for a third radiation element 202C. That is, the decoupling element 206 of the present embodiment is disposed for at least one of the radiation elements 202.
  • FIG. 3 is a view illustrating schematically a radiation element used in an antenna according to one example embodiment of the present invention.
  • four dipole elements 212A, 212B, 212C and 212D are 440 disposed with square shape in one radiation element 202.
  • the first dipole element 212A and the third dipole element 212C do not affect to generation of -45 ° polarization.
  • electric fields 3 10A, 310B, 310C and 310D are generated from the dipole elements 212A, 212B, 212C and 212D, and so +45 ° polarization 3 12 is generated in accordance with vector sum of the electric fields 3 10A, 3 10B, 310C and 310D.
  • direction of electric fields generated from the dipole elements 212A, 212B, 212C and 212D may be changed in accordance with a method of applying given current, which is not shown, and so -45 ° polarization is generated in accordance with vector sum of the electric fields.
  • the above method of generating ⁇ 45 ° polarizations is referred- to as 465 a vector-sum method.
  • the radiation element 202 may output the radiation pattern through the combination method or the vector-sum method.
  • a method of outputting the radiation pattern is not limited.
  • FIG. 4 is a view illustrating schematically a radiation element 470 according to another example embodiment of the present invention.
  • the radiation element 202 surrounded by the decoupling element 206 has a feeding line 400A and two dipole elements 400B.
  • the dipole element 400B has a rod shape unlike the dipole elements
  • the dipole element 400B is substantially vertical to the feeding line 400A.
  • the dipole element 400B may be disposed in parallel to the reflection plate 200.
  • FIG. 5 is a view illustrating schematically a radiation element according to still another example embodiment of the present invention.
  • the radiation element 202 surrounded by the decoupling element 206 has four dipole elements 500.
  • the dipole elements 500 are disposed with a rod shape in a direction vertical to a feeding line (not shown), and are embodied with X shape as shown in FIG. 5.
  • the radiation element 202 may 485 be variously modified as long as the radiation element 202 is surrounded by the decoupling element 206.
  • corresponding decoupling elements 206 surround a part or all of the radiation elements 202, a user may obtain desired isolation characteristic and desired front to back ratio characteristic by disposing 490 properly the decoupling element 206.
  • one decoupling element 206 may surround at least two radiation elements 202.
  • FIG. 6 is a perspective view illustrating an antenna according to a second example embodiment of the present invention. 495
  • the antenna of the present embodiment includes a reflection plate 600, radiation elements 602, at least one choke element 604 and a decoupling element 606.
  • decoupling element 606 Since the other elements of the present embodiment except the decoupling element 606 are the same as in the first embodiment, any further 500 description concerning the same elements will be omitted.
  • the decoupling element 606 has a first sub-decoupling element 606A, a second sub-decoupling element 606B and a third sub-decoupling element 606C.
  • the first sub-decoupling element 606A has a structure for surrounding 505 dipole elements of the radiation element 602, e.g. a rectangular shape, and is located between the dipole elements and the reflection plate 600.
  • the second sub-decoupling element 606B is longitudinal-extended from the first sub-decoupling element 606A in a direction crossing over the first sub-decoupling element 606A, i.e. direction to the reflection plate 600, 510 and is coupled to the choke element 604 and/or the reflection plate 600.
  • two second sub-decoupling elements 606B may be coupled to one choke element 604 as shown in FIG. 6(A)
  • three second sub-decoupling elements 606B may be coupled to one choke element 604 as shown in FIG.
  • the third sub-decoupling element 606C is longitudinal-extended from the first sub-decoupling element 606A in a direction crossing over the first sub-decoupling element 606A, i.e. direction to the reflection plate 600, and is electrically connected to the reflection plate 600. As a result, the third sub-decoupling element 606C becomes short.
  • the decoupling element 606 of the present embodiment further includes the third sub-decoupling element 606C connected electrically to the reflection plate 600 compared with in the first embodiment.
  • the isolation characteristic of the antenna may be more enhanced compared to that of the first embodiment.
  • the third sub-decoupling element 606C is electrically connected to the reflection plate 600 by longitudinal-extended from the first sub-decoupling element 606A.
  • the third sub- decoupling element 606C may be electrically connected to the reflection plate 600 by longitudinal-extended from the second sub-decoupling element
  • the third sub-decoupling element 606C has bent shape.
  • a corresponding decoupling element surrounds a part or all of the radiation elements 602.
  • the first decoupling element 535 606 surrounds a first radiation element 602A
  • a third decoupling element 608 surrounds a third radiation element 602C.
  • the decoupling elements 606 and 608 have the same structure, or have different structures.
  • the first decoupling element 606 has the structure 540 in the second embodiment
  • the second decoupling element 608 has the structure in the first embodiment.
  • the structure and disposition of the decoupling element are not limited as long as the decoupling element surrounds a part or all of the radiation elements 602.
  • the 545 decoupling element 606 may surround two or more radiation elements 602 not one radiation element 602.
  • FIG. 7 is a perspective view illustrating structure of a decoupling 550 element according to one example embodiment of the present invention.
  • the decoupling element has a first sub- decoupling element 700 for surrounding dipole elements and a second sub- decoupling element 702 which supports the first sub-decoupling element 700 and is electrically connected to a choke element and/or a reflection plate.
  • the decoupling element has the first sub- decoupling element 700 and the second sub-decoupling element 702.
  • the decoupling element has the
  • first sub-decoupling element 700 the second sub-decoupling element 702 and a third sub-decoupling element 704 connected electrically to a reflection plate.
  • number and location of the third sub-decoupling element 704 are not limited.
  • the decoupling element has at least three
  • the third sub-decoupling element 704 of the decoupling element is longitudinal-extended from an inner side of the first sub-decoupling element 700.
  • the decoupling element may have another structure, i.e. may be variously modified. Accordingly, it will be immediately obvious to those skilled in the art that many modifications of the decoupling element do not have any effect to the scope of the present invention. 575
  • experimental result concerning the isolation characteristic and the front to back ratio characteristic of the antenna will be described in detail with reference to accompanying drawings.
  • FIG. 8 is a view illustrating a graph showing isolation characteristic
  • FIG. 8(A) illustrates a graph showing isolation characteristic of an antenna in case that three decoupling elements having the structure in FIG. 7(A) are existed
  • FIG. 8(B) illustrates a graph showing isolation characteristic of an antenna in case that one decoupling element having the
  • FIG. 8(C) illustrates a graph showing isolation characteristic of an antenna in case that two decoupling elements having the structure in FIG. 7(A) are existed.
  • an isolation curve 802 when the decoupling element exists has an isolation value smaller than an isolation curve 800
  • the isolation characteristic is enhanced.
  • the antenna has excellent isolation characteristic by using the decoupling element because every isolation value of the isolation curve 802 has a value less than -3OdB.
  • the isolation curve 802 when 595 the decoupling element exists has an isolation value smaller than the isolation curve 800 when the decoupling element does not exist. In other words, it is verified that the isolation characteristic is enhanced.
  • the antenna of the present invention including the decoupling element has excellent isolation characteristic compared to a conventional
  • the 600 antenna irrespective of number and shape of the decoupling element. Specially, it is verified that the antenna has excellent isolation characteristic by using the decoupling element because every isolation value of the isolation curve 802 has a value less than -3 OdB.
  • FIG. 9 is a view illustrating a graph showing a front to back ratio characteristic of an antenna according to one example embodiment of the present invention. That is, FIG. 9 shows the front to back ratio characteristic in accordance with various decoupling elements.
  • a front to back ratio curve 902 of the antenna including the decoupling element is excellent than a front to back ratio curve 900 of an antenna not having the decoupling element.
  • a front to back ratio value when the decoupling element exists is smaller than that when the decoupling 615 element does not exist. That is, it is verified that the front to back ratio characteristic of the antenna of the present invention including the decoupling element is excellent than that of the antenna not having the decoupling element.
  • FIG. 10 is a perspective view illustrating schematically an antenna 620 according to a third example embodiment of the present invention.
  • the antenna of the present embodiment includes a reflection plate 1000, a first radiation element 1002, a second radiation element 1004, a choke element 1006 and a decoupling element 1008.
  • the first radiation element 1002 is an element for low frequency band. 625
  • the second radiation element 1004 is an element for high frequency band, and is disposed inside the first radiation element 1002 as shown in FIG. 10.
  • the antenna is a dual polarization multi-band antenna.
  • the decoupling element 1008 surrounds dipole elements of the first radiation element 1002 for low frequency band.
  • the decoupling element may be used for the multi-band antenna as well as an antenna for specific frequency band.
  • a decoupling element does not surround the first radiation element 1002 for low frequency band, but surround the second radiation element 1004 for high 635 frequency band.
  • FIG. 11 is a perspective view illustrating schematically an antenna according to a fourth example embodiment of the present invention.
  • the antenna of the present embodiment includes a reflection plate 1100, a radiation element 1102, at least one choke 640 element 1104 and a decoupling element 1106.
  • decoupling element 1106 Since the other elements of the present embodiment except the decoupling element 1106 are the same as in the first embodiment, any further description concerning the same elements will be omitted.
  • the decoupling element 1106 does not include a second sub- 645 decoupling element for supporting a first sub-decoupling element 1106A unlike in the first embodiment.
  • the first sub-decoupling element 1106A is supported by the choke elements 1104 without the second sub- decoupling element as shown in FIG. 11.
  • a third sub-decoupling element 1106B coupled to the reflection plate 1100 may be included in the 650 decoupling element 1106, or may not be included in the decoupling element 1106.
  • FIG. 12 is a perspective view illustrating schematically an antenna according to a fifth example embodiment of the present invention.
  • the antenna of the present embodiment includes a 655 reflection plate 1200, a radiation element 1202, at least one choke element 1204, a first decoupling element 1206 and a second decoupling element 1208.
  • the first decoupling element 1206 is disposed in a first direction on the basis of a feeding line (not shown), and has a first sub-decoupling element 1206A and a second sub-decoupling element 1206B .
  • the first sub-decoupling element 1206A is disposed between dipole elements of the radiation element 1202 and the reflection plate 1200.
  • the second sub-decoupling element 1206B is longitudinal-extended from the first sub-decoupling element 1206A in a direction to the reflection plate 1200 from the first sub-decoupling element 1206A, and is electrically 665 connected to the choke element 1204 and/or the reflection plate 1200.
  • the reflection plate 1200, the choke element 1204 and the first sub- decoupling element 1206 form one electrical loop.
  • a third sub-decoupling element 1206C coupled to the reflection plate 1200 may be included in the first decoupling element 1206 as shown in FIG. 670 12(B), and may not be included in the first decoupling element 1206 as shown in FIG. 12(A).
  • the second decoupling element 1208 is disposed in a direction opposed to the first direction on the basis of the feeding line, and may have the same structure as the first decoupling element 1206 or may have different 675 structure from the first decoupling element 1206.
  • the first decoupling element 1206 has the third sub-decoupling element 1206C
  • the second decoupling element 1208 does not have the third sub-decoupling element 1206C.
  • two decoupling elements 1206 and 1208 are 680 disposed for one radiation element 1202, but only one decoupling element may be disposed for one radiation element 1202.
  • the decoupling element may be located between the radiation elements 1202.
  • the decoupling element 1206 or 1208 may have various modifications 685 as shown in the first embodiment to the fourth embodiment.
  • FIG. 13 is a perspective view illustrating an antenna according to a sixth example embodiment of the present invention. Particularly, FIG. 13(A) shows schematically whole structure of the antenna, and FIG. 13(B) shows a decoupling element in the antenna.
  • the antenna of the present embodiment includes a reflection plate 1300, at least one radiation element 1302, at least one choke element 1 304 and the decoupling element 1306.
  • the reflection plate 1300 functions as a ground and a reflector, for example has a plane shape.
  • the reflection plate 1300 may have shape bent in a direction opposed to a direction in which the choke element 1304 is formed.
  • the radiation element 1302 outputs a specific radiation pattern, for example outputs a dual polarization, i.e. ⁇ 45 ° polarizations.
  • This radiation element 1302 has a feeding element 13 10 and at least one dipole 700 elements 1312.
  • the feeding element 1310 provides current applied through a feeding line (not shown) to the dipole elements 1312, the feeding line being disposed in a direction vertical to the reflection plate 1300.
  • the dipole elements 13 12 generate electric fields in accordance with 705 the applied current, and so a specific radiation pattern is outputted in accordance with the electric fields.
  • the dipole elements 1312 are coupled to the feeding element 1310, and for example have rectangular shape.
  • the structure of the dipole elements 212 may be variously modified without limit.
  • the choke elements 1304 are formed on a given area of the reflection plate 1300, e.g. both end portions under the condition that the choke elements 1304 are electrically connected to the reflection plate 1300 as shown in FIG. 13(A), and control a beam characteristic such as beam width, front to back ratio, etc.
  • a beam characteristic such as beam width, front to back ratio, etc.
  • a manager may set location of the choke elements 1304 considering the width of the beam to be outputted from the antenna.
  • a manager may set location of the choke elements 1304 considering the width of the beam to be outputted from the antenna.
  • the choke elements 1304 are not disposed on both end portions of the reflection plate 1300, but one choke element 1304 may be disposed on one end portion of the reflection plate 1300.
  • the choke elements 1304 are not necessary elements of the present
  • the decoupling element 1306 as a conductor is disposed around the radiation element 1302, e.g. between the dipole elements 1312 and the reflection plate 1300. Namely, the decoupling element 1306 is located
  • the decoupling element 1306 may be disposed between adjoining radiation elements 1302.
  • This decoupling element 1306 enhances isolation characteristic between channels. 735
  • structure of the decoupling element 1306 will be described in detail.
  • the decoupling element 1306 is embodied as for example one body type element, and includes a first sub-decoupling element 1306A, a second sub-decoupling element 1306B and a third sub-decoupling 740 element 1306C.
  • the first sub-decoupling element 1306A is coupled to the reflection plate 1300, and is disposed in a direction crossing over the reflection plate
  • bottom side of the first sub-decoupling element 1306A is formed to be coupled
  • the second sub-decoupling element 1306B is coupled to the reflection plate 1300, and is disposed in a direction crossing over the reflection plate 1300.
  • the third sub-decoupling element 1306C connects the first sub- 750 decoupling element 1306A to the second sub-decoupling element 1306B, and generates scattered reflection.
  • both ends of the decoupling element 1306 are coupled to the reflection plate 1300, and so the decoupling element 1306 and the reflection plate 1 300 form an electrical loop.
  • An angle ⁇ between the second sub-decoupling element 1306B and the third sub-decoupling element 1306C is not limited as specific angle.
  • an angle ⁇ between a normal of the reflection plate 1300 and the third sub-decoupling element 1306C is not limited.
  • the angle ⁇ may have angle of about 45 ° to about 90 ° .
  • the antenna of the present embodiment enhances the isolation characteristic of channels by using the decoupling element 1306 of which both ends are electrically connected to the reflection plate 1300.
  • one decoupling element 1306 is disposed around one radiation element 1302. However, a plurality of decoupling elements 765 1306 may be disposed around one radiation element 1302 as described below. Additionally, one decoupling element 1306 may be located between adjoining radiation elements 1302.
  • the decoupling elements 1306 may be disposed one to one around the radiation elements 1302, and be disposed 770 around a part of the radiation elements 1302.
  • FIG. 14 is a view illustrating schematically a radiation element 775 according to another example embodiment of the present invention.
  • the radiation element 1302 includes a feeding line 1400A and two dipole elements 1400B.
  • the dipole element 1400B has different structure from the dipole element 1312 in FIG. 13. Particularly, the dipole element 1400B is 780 longitudinal-extended with rod shape from the feeding line 1400A in a direction parallel to the reflection plate 1300.
  • the decoupling element 1306 may be disposed around one radiation element 1302 as shown in FIG. 14(A), and be disposed between adjoining radiation elements 1302A and 1302B as shown in FIG. 14(B).
  • FIG. 15 is a view illustrating a radiation element according to still another example embodiment of the present invention.
  • the radiation element 1302 has four dipole elements 1500.
  • the dipole elements 1500 are disposed with a rod shape in a direction vertical to a feeding line (not shown), and are embodied with X shape as 790 shown in FIG. 15.
  • the decoupling element 1306 may be located between two dipole elements 1500 as shown in FIG. 15.
  • the decoupling elements 1306 may be respectively disposed between the dipole elements 1500.
  • the decoupling element 1306 may be located between the radiation elements 795 1302.
  • driving method and a structure of the radiation element 1302 may be variously modified as long as the decoupling element 1306 is disposed around the radiation element 1302 to enhance the isolation characteristic.
  • FIG. 16 is a perspective view illustrating various decoupling elements according to one example embodiment of the present invention.
  • the decoupling element 1306 has one body type structure, and includes a first sub-decoupling element 1306A, a second sub- decoupling element 1306B and a third sub-decoupling element 1306C. 805
  • the first sub-decoupling element 1306A is coupled to the reflection plate 1300, and is disposed in a direction crossing over the reflection plate 1300.
  • the second sub-decoupling element 1306B is coupled to the reflection plate 1300, and is disposed in a direction crossing over the reflection plate 810 1300.
  • the third sub-decoupling element 1306C connects the first sub- decoupling element 1306A to the second sub-decoupling element 1306B.
  • the decoupling element 1306 may further include a fourth sub-decoupling element 1306D extended from a 815 connection point of the second sub-decoupling element 1306B and the third sub-decoupling element 1306C.
  • a structure and a direction of the fourth sub-decoupling element 1306D may be variously modified as shown in FIG. 16(B) to FIG 16(E).
  • the decoupling element 1306 may further 820 include a fifth sub-decoupling element 1306E for connecting the second sub- decoupling element 1306B to the third sub-decoupling element 1306C.
  • the decoupling element 1306 may further include a sixth sub-decoupling element 1306F longitudinal- extended from the first sub-decoupling element 1306A. Since the sixth 825 sub-decoupling element 1306F is located outmost, the sixth sub-decoupling element 1306F may operate as a decoupling element for adjoining radiation element 1302. In other words, one decoupling element 1306 may enhance isolation characteristics of two radiation elements 1302.
  • the decoupling element 1306 of the present embodiment may 830 be variously modified as long as both ends of the decoupling element 1306 are electrically connected to the reflection plate 1300.
  • FIG. 17 is a perspective view illustrating various decoupling elements according to another example embodiment of the present invention.
  • the decoupling element 1306 includes a first sub- 835 decoupling element 1306A and a second sub-decoupling element 1306B.
  • the first sub-decoupling element 1306A is electrically connected to the reflection plate 1300.
  • width of the first sub-decoupling element 1306A is greater than height of the first sub-decoupling element 1306A.
  • the second sub-decoupling element 1306B is longitudinal-extended from the first sub-decoupling element 1306A.
  • an angle ybetween a normal of the reflection plate 1300 and the second sub-decoupling element 1306B may be an angle of about 45 ° to about 90° .
  • the decoupling element 1306 is coupled to only the reflection plate
  • the decoupling element 1306 may be coupled to the choke element 1304.
  • an end portion of the second sub- decoupling element 1306B may be coupled to the choke element 1304.
  • the decoupling element 1306 may further include a third sub-decoupling element 1306C longitudinal- extended from the second sub-decoupling element 1306B.
  • the decoupling element 1306 may further include a fourth sub-decoupling element 1306D longitudinal- 855 extended from the first sub-decoupling element 1306A.
  • the angle y between the normal of the reflection plate 1300 and the second sub- decoupling element 1306B may be about 45 ° to about 90 ° .
  • a part of the decoupling element 1306 is coupled to the choke element 1304, and other part of the decoupling element 1306 is coupled to the reflection plate 1300.
  • the reflection plate 1300, the decoupling element 1306 and the choke element 1304 form the electrical loop.
  • FIG. 18 is a view illustrating disposition of decoupling elements according to one example embodiment of the present invention.
  • decoupling elements 1306A and 1306B may be disposed around one radiation element 1302.
  • the decoupling elements 1306A and 136B are formed in a first direction where the radiation
  • 870 elements 1302 are disposed.
  • only one decoupling element 1 306 may be disposed around the radiation element 1302.
  • the decoupling elements 1306A and 1306B have the same structure, or different structures.
  • the decoupling elements 1306C and 875 1306D are disposed in a second direction vertical to the first direction.
  • the decoupling elements 1306C and 1306D do not be coupled to the choke elements 1304, but be coupled to only reflection plate 1300.
  • the decoupling elements 1306C and 1306D may be coupled to the reflection plate 1300 and the choke elements 1304.
  • decoupling elements 1306A, 1306B, 1306C and 1306D may be disposed between four dipole elements of the radiation element 1302.
  • the decoupling elements 1306A, 1306B, 1306C and 1306D have the same structure, or different structures.
  • the decoupling elements 1306A and 1306B may be any decoupling elements 1306A and 1306B.
  • the decoupling elements 1306A and 1306B have the same structure, or different structures.
  • only one decoupling element 1306 may be disposed between the radiation elements 1302A and 1302B.
  • number and disposition of the decoupling element 1306 may be variously modified.
  • FIG. 19 is a perspective view illustrating schematically an antenna according to a seventh example embodiment of the present invention.
  • the antenna of the present embodiment includes a 895 reflection plate 1900, a first radiation element 1902, a second radiation element 1904, a choke element 1906 and a decoupling element 1908.
  • the first radiation element 1902 is an element for low frequency band.
  • the second radiation element 1904 is an element for high frequency band, and is located inside of the first radiation element 1902 as shown in 900 FIG. 19. That is, the antenna of the present embodiment is a dual polarization multi-band antenna.
  • the decoupling element 1908 is disposed around the first radiation element 1902 for low frequency band.
  • the decoupling element of the present invention may be used
  • any reference in this specification to "one embodiment,” “an embodiment,” “example embodiment,” etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention.

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Abstract

L’invention concerne une antenne permettant d’améliorer des caractéristiques d’isolation et des caractéristiques de rapport des rayonnements avant et arrière à l’aide d’un élément de découplage. L’antenne comporte une plaque de réflexion, un élément de rayonnement disposé sur la plaque de réflexion et un élément de découplage configuré pour entourer l’élément de rayonnement avec une forme de boucle.
PCT/KR2008/007252 2008-08-11 2008-12-08 Antenne équipée d’un élément de découplage WO2010018896A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020080078512A KR101027374B1 (ko) 2008-08-11 2008-08-11 디커플링 소자를 가지는 안테나
KR1020080078509A KR100983613B1 (ko) 2008-08-11 2008-08-11 디커플링 소자를 가지는 안테나
KR10-2008-0078509 2008-08-11
KR10-2008-0078512 2008-08-11

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WO2010018896A1 true WO2010018896A1 (fr) 2010-02-18

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WO2017091307A1 (fr) * 2015-11-25 2017-06-01 Commscope Technologies Llc Antennes réseau à commande de phase comportant des unités de découplage
CN108321511A (zh) * 2018-03-27 2018-07-24 京信通信系统（中国）有限公司 通信基站及其基站天线
US20180261929A1 (en) * 2015-11-16 2018-09-13 Huawei Technologies Co., Ltd. Ultra compact ultra broad band dual polarized base station antenna
US10381712B2 (en) 2016-01-20 2019-08-13 Hewlett-Packard Development Company, L.P. Dual-band wireless LAN antenna
US10431877B2 (en) 2017-05-12 2019-10-01 Commscope Technologies Llc Base station antennas having parasitic coupling units
WO2020190863A1 (fr) * 2019-03-21 2020-09-24 Commscope Technologies Llc Antennes de station de base comprenant des ensembles passifs pour améliorer les performances de discrimination par polarisations croisées

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KR20070020272A (ko) * 2004-06-04 2007-02-20 앤드류 코포레이션 지향성 다이폴 안테나
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KR20000007676A (ko) * 1998-07-06 2000-02-07 구관영 쵸크 반사기를 갖는 저 사이드로브 이중 편파 지향성 안테나
KR20020022071A (ko) * 1999-07-08 2002-03-23 구스벤트너 죠셉 안테나
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US20180261929A1 (en) * 2015-11-16 2018-09-13 Huawei Technologies Co., Ltd. Ultra compact ultra broad band dual polarized base station antenna
US11362441B2 (en) 2015-11-16 2022-06-14 Huawei Technologies Co., Ltd. Ultra compact ultra broad band dual polarized base station antenna
US10601145B2 (en) * 2015-11-16 2020-03-24 Huawei Technologies Co., Ltd. Ultra compact ultra broad band dual polarized base station antenna
US10833401B2 (en) 2015-11-25 2020-11-10 Commscope Technologies Llc Phased array antennas having decoupling units
EP3381084A4 (fr) * 2015-11-25 2019-07-24 CommScope Technologies LLC Antennes réseau à commande de phase comportant des unités de découplage
WO2017091307A1 (fr) * 2015-11-25 2017-06-01 Commscope Technologies Llc Antennes réseau à commande de phase comportant des unités de découplage
CN108028462A (zh) * 2015-11-25 2018-05-11 康普技术有限责任公司 具有解耦单元的相控阵列天线
US10381712B2 (en) 2016-01-20 2019-08-13 Hewlett-Packard Development Company, L.P. Dual-band wireless LAN antenna
US10431877B2 (en) 2017-05-12 2019-10-01 Commscope Technologies Llc Base station antennas having parasitic coupling units
US11108135B2 (en) 2017-05-12 2021-08-31 Commscope Technologies Llc Base station antennas having parasitic coupling units
CN108321511A (zh) * 2018-03-27 2018-07-24 京信通信系统（中国）有限公司 通信基站及其基站天线
CN108321511B (zh) * 2018-03-27 2024-02-23 京信通信技术(广州)有限公司 通信基站及其基站天线
WO2020190863A1 (fr) * 2019-03-21 2020-09-24 Commscope Technologies Llc Antennes de station de base comprenant des ensembles passifs pour améliorer les performances de discrimination par polarisations croisées
US11183775B2 (en) 2019-03-21 2021-11-23 Commscope Technologies Llc Base station antennas having parasitic assemblies for improving cross-polarization discrimination performance

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