EP2059973A1 - Mehrantennensystem mit polarisationsdiversität - Google Patents

Mehrantennensystem mit polarisationsdiversität

Info

Publication number
EP2059973A1
EP2059973A1 EP07803182A EP07803182A EP2059973A1 EP 2059973 A1 EP2059973 A1 EP 2059973A1 EP 07803182 A EP07803182 A EP 07803182A EP 07803182 A EP07803182 A EP 07803182A EP 2059973 A1 EP2059973 A1 EP 2059973A1
Authority
EP
European Patent Office
Prior art keywords
antenna
slot
patch
ground plane
antennas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07803182A
Other languages
English (en)
French (fr)
Other versions
EP2059973B1 (de
Inventor
Lionel Rudant
Christophe Delaveaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP2059973A1 publication Critical patent/EP2059973A1/de
Application granted granted Critical
Publication of EP2059973B1 publication Critical patent/EP2059973B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • 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
    • H01Q13/10—Resonant slot antennas
    • H01Q13/106—Microstrip slot antennas
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the present invention relates to the field of antennas, in particular that of polarization diversity antennas for telecommunication terminals.
  • transmission and / or reception diversity techniques At the base station, it is possible to use, for example, antennas sufficiently distant from each other (a distance greater than at least half the wavelength at the operating frequency), an antenna array for to form beams pointing in distinct angular directions or even antennas emitting in different polarizations: one speaks according to the case of spatial diversity, of angular diversity or diversity of polarization. Similarly, the same diversity techniques are in principle applicable to the mobile terminal.
  • Either antennas sufficiently distant from each other will be used so that the received signals have undergone uncorrelated propagation conditions, antennas having reception patterns pointing in different angular directions or antennas distinct polarizations, for example according to linear polarizations orthogonal to each other.
  • This system consists of a patch antenna (also called plated antenna) and a dipole antenna.
  • the patch is pierced with a hole through which the dipole antenna printed on a substrate passes.
  • This system is not flat and does not lend itself easily to integration into a mobile terminal.
  • a polarization diversity multi-antenna system for a base station has been proposed in the article by N. Kuga et al. entitled "A composite patch-slot antenna for VH-polarization diversity base stations "published in Proc. of Asia-Pacific Microwave Conference, Dec. 2000. It comprises two intertwined antenna arrays: a first network consisting of horizontally polarized patch elements and a second array of vertically polarized patch elements. The elements of the first network are excited by slots cut in the ground plane while the elements of the second network are excited by microstrip lines.
  • This multi-antenna system is also not compatible with integration into a mobile terminal.
  • the object of the present invention is to overcome the aforementioned drawbacks, that is to say to propose a multi-antenna system diversity, compact and easily integrated in a mobile terminal while having only a weak coupling between antennas.
  • the present invention is defined by a polarization diversity multi-antenna system comprising a first slot antenna and a second patch antenna, said first and second antennas sharing the same ground plane, the slot of the first antenna being arranged in said ground plane and the patch of the second antenna at least partially overhanging said slot, said first and second antennas having a common operating frequency band, wherein: said slot is open on one side over its width and its length is substantially equal to one an odd multiple of a quarter of the wavelength guided in the slot, in said operating frequency band and / or
  • the patch is electrically connected to the ground plane and its length is substantially equal to an odd multiple of a quarter of the wavelength guided in the patch, in said operating frequency band.
  • FIG. 1 schematically shows a multi-antenna system according to a first embodiment of the invention
  • FIG. 2 schematically shows a multi-antenna system according to a second embodiment of the invention
  • FIG. 3 schematically shows a multi-antenna system according to a third embodiment of the invention
  • FIG. 4 schematically shows a multi-antenna system according to a fourth embodiment of the invention
  • FIG. 5 schematically shows a multi-antenna system according to a fifth embodiment of the invention
  • FIG. 6 schematically shows a multi-antenna system according to a sixth embodiment of the invention
  • FIG. 1 schematically shows a multi-antenna system according to a first embodiment of the invention
  • FIG. 2 schematically shows a multi-antenna system according to a second embodiment of the invention
  • FIG. 3 schematically shows a multi-antenna system according to a third embodiment of the invention
  • FIG. 4 schematically shows a multi-antenna system according to a fourth
  • FIG. 7 schematically shows a multi-antenna system according to a seventh embodiment of the invention
  • FIG. 8 shows a first example of arrangement of multi-antenna systems according to the invention on the ground plane of a mobile terminal
  • FIG. 9 shows a second example of arrangement of multi-antenna systems according to the invention on the ground plane of a mobile terminal
  • FIG. 10 represents the reflection and coupling coefficients as a function of the operating frequency of a multi-antenna system according to the invention
  • FIG. 11 shows the directivity diagrams as a function of the polarization of the antennas constituting a multi-antenna system according to the invention.
  • the idea underlying the invention consists in associating on the same ground plane a patch-type antenna and a slot-type antenna, the patch overhanging at least partially the slot.
  • the geometry and orientation of the patch and slot are chosen so that the patch antenna and the antenna each slot type can emit and / or receive in a rectilinear polarization, the polarization directions associated with the two antennas being orthogonal to each other.
  • receive mode the signals respectively received by the patch antenna and the slot antenna can be combined to provide reception diversity.
  • the geometry and the orientation of the patch and the slot are chosen so that the respective directions of establishment of the resonance in the patch and the slot are substantially parallel.
  • Classically it is known that for a patch the distribution of the electric field in the direction of establishment of the resonance is sinusoidal and has two maxima at each end of the patch.
  • the electric field distribution in the direction of resonance establishment is sinusoidal and has two zeros at each end of the slot. In either case, the number of periods of the sinusoidal distribution depends on the order of the resonance.
  • the electromagnetic field generated by the patch is conventionally denoted by TM n where n gives the order of the resonance in the resonance direction x, the electric field being directed along this direction.
  • the electromagnetic field generated by the slot is conventionally denoted by TE n 0 where n 'gives the order of the resonance in the resonance direction x', the electric field being orthogonal to x 'and parallel to the plane of the slot.
  • Fig. 1 schematically illustrates a first embodiment of the multi-antenna system according to the invention.
  • A a perspective view and (B) a vertical section of the system in its median plane.
  • This includes a metal ground plane common to the patch-type antenna and the slot-type antenna.
  • the ground plane is typically made by a metal plate or a metal layer deposited on a dielectric substrate 15.
  • a slot 20 is provided in the ground plane and a metal patch 30 is arranged to at least partially overhang the slot.
  • the patch may be made either by a metal plate or by deposition of metal layer (s) on a dielectric substrate. The latter can be the same as that of the ground plane. In this case, the patch is deposited on the face of the substrate opposite to that on which the ground plane is deposited.
  • the slot has an elongated trapezoidal shape in a longitudinal direction. It can, however, be of any form symmetrical, for example rectangular or elliptical, or not symmetrical.
  • the metal patch 30 has an elongated elliptical shape in a longitudinal direction. It may, however, be of any symmetrical shape, for example rectangular or trapezoidal, or even unsymmetrical.
  • FF 'and PP' were noted respectively the resonance directions of the slot and the patch. As we have seen above, these two axes are chosen substantially parallel. These axes coincide here respectively with the axes of longitudinal symmetry of the slot and the patch.
  • the axes FF 'and PP' may be offset laterally relative to each other in a plane parallel to the ground plane or contained in the same plane orthogonal to the ground plane in which case the orthogonal projection of the axis PP 'on the ground plane advantageously coincides with the axis FF'.
  • the two axes FF 'and PP' belong to the median plane of the system, orthogonal to the ground plane.
  • the electric field generated by the slot-type antenna has a rectilinear polarization orthogonal to the median plane.
  • the electric field generated by the patch type antenna has a linear polarization parallel to the axis PP '.
  • the signal received by the slot-type antenna is maximum when the electric field has a rectilinear polarization orthogonal to the median plane and the signal received by the patch-type antenna is maximum when the electric field has a polarization parallel to the axis PP '. Since the patch at least partially overhangs the slot, the orthogonal projection of the patch on the metal plane has a nonempty intersection with the latter. According to an alternative embodiment, the orthogonal projection of the patch on the ground plane completely includes the shape of the slot.
  • the slot-type and patch type antennas are thus co-located and the multi-antenna system is particularly compact.
  • the slot-type antenna can be excited by means of a coaxial cable or a coplanar line in a manner known to those skilled in the art.
  • the slot may be excited by coupling with a microstrip line printed on the substrate on the opposite side to the ground plane.
  • the patch antenna can be excited by means of a metal probe 35 as shown in FIG. 1 or a coaxial cable whose core is connected to a point of the patch, the mass being connected to the ground plane.
  • the patch may be excited by coupling with a microstrip line printed on the face of a substrate possibly dedicated to excitation.
  • patch-type and slot-type antennas can be excited by direct electrical contact and / or electromagnetic coupling.
  • the length of the slot along the axis FF ' is chosen substantially equal to an integer multiple of the guided half-wavelength, associated with the operating frequency.
  • the length of the patch along the axis PP ' is chosen substantially equal to a multiple integer of the guided half-wavelength, associated with the operating frequency.
  • the guided wavelength differs slightly from the free propagation wavelength due to the presence of the edge fields. It equals twice the fundamental resonance length in the guide.
  • An analytical expression of the guided wavelength for a slot antenna can be found, for example, in the article by R. Garg et al. entitled “Expressions for wavelength and impedance of a slotline" published in IEEE Trans. on Microwave Theory, August 1976, page 532.
  • the operating frequencies of the slot and patch antennas are advantageously chosen to be identical. More generally, as will be seen below, it is possible to use the slot antenna and the patch antenna in the same operating frequency band without significant coupling between the two antennas.
  • the operating frequency will be of the order of 2 GHz and the slot and patch lengths of the order of 6 to 7.5 cm. These lengths are compatible with the dimensions of a mobile terminal.
  • a half-slot instead of a whole slot. More specifically, the slot is open on one side 21 over its entire width.
  • This embodiment is shown in FIG. 2.
  • the half-slot 20 is in the form of a notch at the periphery of the ground plane 10.
  • the length of the notch along the axis FF ' is equal to an integer multiple of a quarter of the guided wavelength at the operating frequency.
  • a metal return 37 to the ground plane is provided at the edge of the patch.
  • This metal return may be wired or, as in the embodiment shown in FIG. 4, realized by means of a metal plate 37 substantially orthogonal to the ground plane.
  • This plate then makes the electrical junction between the edge of the patch, orthogonal to the longitudinal axis PP ', located on the side opposite the slot, with the ground plane.
  • the length of the patch along the axis PP ' is then advantageously chosen equal to an integer multiple of a quarter of the wavelength guided (in the patch), associated with the operating frequency.
  • the slot 20 remains equal in length to an integer multiple of the guided half-wavelength (in the slot) as in the first embodiment.
  • Fig. 4 schematically illustrates a fourth particularly advantageous embodiment of the multi-antenna system according to the invention.
  • the slot 20 and the patch 30 have respective lengths substantially equal to integer multiples of the quarter of the guided wavelengths (respectively in the slot and in the patch), associated with the operating frequency.
  • the slot opens out at the periphery of the ground plane as in the second embodiment and a metal return 37 is provided in the form of a plate at the edge of the patch, as already described.
  • the metal return may be wired, as shown in FIG. 3.
  • the slit and patch lengths will be of the order of 3 cm and the height of the plate 37 serving as a return to ground is of the order of 1 cm.
  • capacitors, inductances, .. discrete or distributed as known to those skilled in the art.
  • Fig. 5 schematically represents the section of a multi-antenna system according to a fifth mode of embodiment of the invention, wherein there is provided a plurality of patch antennas 31, 32 of different lengths overlooking the slot.
  • the return to ground 37 is advantageously common but separate ground returns can also be envisaged.
  • the mass return can be wired or plate type as already seen above.
  • the excitation probe 35 is advantageously common to the different patch antennas, but separate probes can also be envisaged.
  • the superimposed patches correspond to the same resonance frequency.
  • the lengths of these patches are substantially equal to odd multiples of a quarter of the wavelength guided in these patches.
  • the operating frequency of the patch is the same as that of the half-slot antenna 20. The advantage of such an assembly is to obtain a particularly compact high gain system.
  • Fig. 6 schematically represents the section of a multi-antenna system according to a sixth embodiment of the invention, in which the patch antenna 30 is folded under the ground plane.
  • the resonance frequency is defined by the total length of the "unfolded" patch. This provides a more compact arrangement than those previously discussed. If necessary, several superimposed patch antennas can be folded under the ground plane.
  • Fig. 7 schematically shows a multi-antenna system according to a seventh embodiment of the invention.
  • a slight transverse recess is understood to mean a recess of substantially smaller amplitude than the spatial extension of the system in the longitudinal direction.
  • Each of the two antennas comprises a first and a second portion, oriented in the same longitudinal direction, and an intermediate portion joining the first and second portions, oriented in a transverse direction.
  • the transverse recess of the patch and slot antennas allows each of them to receive in two distinct polarization modes.
  • the multi-antenna systems according to the invention can be associated so as to constitute a composite system with higher gain and / or order of diversity.
  • Figs. 8 and 9 show two examples of arrangement of such multi-antenna systems on the ground plane of a mobile terminal.
  • the two multi-antenna systems 51 and 52 are arranged upside down.
  • the respective resonance establishment axes of the two antenna systems are substantially parallel.
  • the resonance establishment directions of the two systems are chosen substantially orthogonal.
  • the use of the systems 51 and 52 makes it possible to obtain both a spatial diversity, due to the spacing between antennas and a diversity of polarization.
  • Fig. 10 gives the modules of the coefficients of the matrix S as a function of the operating frequency for a multi-antenna system according to the fourth embodiment of the invention, with a slot and a quarter wave patch.
  • S 22 represent respectively the proportion of energy reflected on the input port of antenna 1 (slot antenna) and the input port of antenna 2 (patch antenna), otherwise says the reflection coefficients on these input ports, expressed in dB.
  • S 12 and S 21 respectively represent the energy coupling of the antenna 1 to the antenna 2 and of the antenna 2 to the antenna 1.
  • Fig. 11 shows the directivity diagrams of the slot-like antenna and the patch-type antenna for a vertically polarized electric field and a horizontally polarized electric field, in a section plane parallel to and equidistant from the ground plane. and the plane containing the metal patch 30. It should be noted that for a given polarization of the electric field, the maximum of the directivity diagram of one antenna corresponds to the minimum of the directivity diagram of the other.

Landscapes

  • Waveguide Aerials (AREA)
EP07803182.0A 2006-09-04 2007-09-03 Mehreren antennensystem mit polarisationsdiversität Active EP2059973B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0653562A FR2905526B1 (fr) 2006-09-04 2006-09-04 Systeme multi-antenne a diversite de polarisation
PCT/EP2007/059197 WO2008028892A1 (fr) 2006-09-04 2007-09-03 Systeme multi-antenne a diversite de polarisation

Publications (2)

Publication Number Publication Date
EP2059973A1 true EP2059973A1 (de) 2009-05-20
EP2059973B1 EP2059973B1 (de) 2020-12-09

Family

ID=37130952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07803182.0A Active EP2059973B1 (de) 2006-09-04 2007-09-03 Mehreren antennensystem mit polarisationsdiversität

Country Status (4)

Country Link
US (1) US8094082B2 (de)
EP (1) EP2059973B1 (de)
FR (1) FR2905526B1 (de)
WO (1) WO2008028892A1 (de)

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Publication number Priority date Publication date Assignee Title
US8214003B2 (en) * 2009-03-13 2012-07-03 Pong Research Corporation RF radiation redirection away from portable communication device user
US8779999B2 (en) 2011-09-30 2014-07-15 Google Inc. Antennas for computers with conductive chassis
JP6398653B2 (ja) * 2014-11-26 2018-10-03 富士通株式会社 パッチアンテナ
JP6437942B2 (ja) * 2016-02-23 2018-12-12 株式会社Ｓｏｋｅｎ アンテナ装置
TWI732931B (zh) * 2016-09-29 2021-07-11 仁寶電腦工業股份有限公司 天線結構
KR102402411B1 (ko) * 2017-06-28 2022-05-27 삼성전자주식회사 안테나 장치 및 안테나를 포함하는 전자 장치
KR102608773B1 (ko) * 2019-02-14 2023-12-04 삼성전자주식회사 안테나 모듈 및 이를 포함하는 전자 장치

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Also Published As

Publication number Publication date
WO2008028892A1 (fr) 2008-03-13
EP2059973B1 (de) 2020-12-09
FR2905526A1 (fr) 2008-03-07
US20090273528A1 (en) 2009-11-05
US8094082B2 (en) 2012-01-10
FR2905526B1 (fr) 2010-06-25

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