WO2003085778A1 - Antenne et procede d'ajustement de bande d'antenne - Google Patents

Antenne et procede d'ajustement de bande d'antenne Download PDF

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Publication number
WO2003085778A1
WO2003085778A1 PCT/JP2003/004485 JP0304485W WO03085778A1 WO 2003085778 A1 WO2003085778 A1 WO 2003085778A1 JP 0304485 W JP0304485 W JP 0304485W WO 03085778 A1 WO03085778 A1 WO 03085778A1
Authority
WO
WIPO (PCT)
Prior art keywords
pattern
antenna
adjustment
housing
ground
Prior art date
Application number
PCT/JP2003/004485
Other languages
English (en)
Japanese (ja)
Inventor
Toru Taura
Original Assignee
Nec Corporation
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 Nec Corporation filed Critical Nec Corporation
Publication of WO2003085778A1 publication Critical patent/WO2003085778A1/fr

Links

Classifications

    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to a broadband antenna that can be used in a mobile terminal and a band adjustment method thereof, and more particularly, to an antenna improved so that an antenna mounting area is reduced, and a band adjustment method thereof.
  • FIG. 5 shows a wide band antenna described in Japanese Patent Application Laid-Open No. 2001-284946.
  • a dipole antenna element 32 having a length of about 70% of a half wavelength of the free space wavelength is provided on a surface of a thin rectangular dielectric plate 31 extending in the lateral direction.
  • 33 a, 33 b, 33 c, 33 d are arranged on the dielectric plate 31.
  • an input / output terminal 35 composed of a coaxial plug is provided at the bottom of the dielectric substrate 31, its internal conductor is connected to a matching line 34a provided on the back surface of the dielectric plate 1, and its external conductor is Connected to dipole antenna element 32.
  • a plurality of parasitic elements 33a, 33b, 33c, and 33d are formed on the dielectric substrate 31 in addition to the area where the dipole antenna element 32 is disposed.
  • An area to arrange is required. As the antenna mounting error required for these arrangements increases, the area for mounting accessories such as other circuit components and functional components decreases. As a result, the mounting area of the entire antenna is reduced, and it is difficult to improve the antenna characteristics. Disclosure of the invention
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a wideband antenna capable of reducing an antenna mounting area and improving antenna characteristics.
  • an antenna pattern made of a conductive film having a length equal to 1Z4 of a free space wavelength, and a substantially rectangular ground having a first edge adjacent to the antenna pattern.
  • a dielectric substrate having a main surface on which a pattern is to be mounted, and a first adjustment pattern formed of an insulator on which a first adjustment pattern formed of a conductive film connected to a second edge of the ground pattern is mounted. And a flexible substrate.
  • the dielectric substrate and the first flexible substrate are housed in, for example, a resin housing.
  • the flexible substrate be disposed so that the adjustment pattern is bent along the inner wall surface of the housing.
  • a resin housing and An antenna pattern made of a conductive film equal to 1 to 4, and a substantially rectangular ground pattern having a first side edge adjacent to the antenna pattern;
  • a conductive first adjustment pattern disposed near a second edge of the ground pattern and along an inner wall surface of the housing;
  • a plurality of first connecting pieces for connecting the adjustment pattern and the ground pattern.
  • the adjustment pattern is preferably formed by depositing a conductive material on the inner wall surface of the housing by vapor deposition or by coating the conductive material. .
  • it can be mounted on a flexible substrate formed of an insulator.
  • the plurality of connecting pieces are flexible plate panels that can be bent and deployed in the housing.
  • the connecting pieces be probe members that can be deployed in the housing without bending.
  • each of the antennas of the first and second viewpoints includes a pair of adjustment patterns, and the pair of adjustment patterns are formed on two adjacent edges of the rectangular ground plane. Connected respectively.
  • the dimensions of the adjustment pattern should be such that the dimension obtained by adding the dimensions of the adjustment pattern to the dimensions of the ground pattern based on the measurement results of the ground size and the antenna band characteristics in advance is the optimum antenna band characteristic. Is selected. BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1A to 1C show a broadband antenna according to a first embodiment of the present invention.
  • FIG. 1A is a developed plan view
  • FIG. 1B is a longitudinal side view in an assembled state
  • FIG. FIG. 3 is a lateral side view in an assembled state.
  • FIG. 2A to 2D are diagrams for explaining antenna characteristics when the size of the ground pattern is changed.
  • FIG. 2A shows a calculation model
  • FIG. Figure 2C shows the reflection characteristics at the antenna feed point when the long side dimension is set to the first predetermined value
  • Figure 2C shows the reflection properties at the antenna feed point when the long side dimension is set to the second predetermined value
  • 2D shows the change in the band with respect to the change in the long side dimension of the ground pattern, respectively.
  • FIG. 3A to 3C show a broadband antenna according to a second embodiment of the present invention.
  • FIG. 2A is an exploded plan view
  • FIG. 2B is a longitudinal side view in an assembled state
  • FIG. FIG. 3 is a short side view in an assembled state.
  • FIG. 4A to 4C show a broadband antenna according to a third embodiment of the present invention.
  • FIG. 4A is a plan view
  • FIG. 4B is a longitudinal side view
  • FIG. 4C is a lateral side view. is there.
  • FIG. 5 is a perspective view of a conventional broadband antenna.
  • FIG. 1A to 1C show a basic configuration of an antenna according to a first embodiment of the present invention.
  • FIG. 1A is a plan view showing the expanded components
  • FIG. Fig. 1C is a side view in the short direction of the assembled state.
  • the antenna according to the present embodiment includes a housing 10, a dielectric (insulated) substrate 11 disposed in the housing 10, a first rectangular flexible insulating substrate 15, and a rectangular shape.
  • the dielectric substrate 11 includes an L-shaped antenna pattern 12 formed of an L-shaped conductive thin film such that the entire pattern length is 1Z4 of the free space wavelength, and the L-shaped antenna pattern 1 2
  • a rectangular ground pattern 13 extending in a direction parallel to the long piece and facing one end of the short piece and arranged near the antenna pattern 12 is mounted on the surface thereof.
  • the ground pattern 13 is formed of a conductive thin film,
  • a second strip adjacent to the first edge adjacent to the turn 12 and a third strip adjacent to the first edge are respectively adjacent to the third edge for electrical connection. It has one connection part 14a, 14b.
  • the first flexible substrate 15 is formed of a thin insulator.
  • a rectangular first adjustment ground pattern 16 made of a conductive thin film is provided on the surface of the first flexible substrate 15. Adjacent to one side in the longitudinal direction, a strip-shaped second connection portion 17 provided for electrical connection with the first connection portion 14a is provided.
  • the flexible substrate 18 is formed of a thin insulator, has a rectangular second adjustment ground pattern 19 made of a conductive thin film disposed on the surface thereof, and has a lengthwise direction of the adjustment ground pattern 19.
  • a strip-shaped second connection portion 20 provided for electrical connection with the first connection portion 14b is provided adjacent to one side.
  • the dielectric substrate 11 and the flexible substrates 15 and 18 are housed in a rectangular parallelepiped casing 10.
  • the second connection portions 17 and 20 of the flexible substrates 15 and 18 are respectively connected to the first connection portions 14 a and 14 a of the dielectric substrate 11 so that the ground pattern 13 is electrically connected to the adjustment ground patterns 16 and 19. Connected to 14b.
  • FIGS. 2A to 2D antenna characteristics when the size of the ground pattern 13 provided on the dielectric substrate 11 provided in the antenna of the present embodiment is changed will be described.
  • Figure 2A shows the calculation model used
  • Fig. 2D shows the dimensions of Figs. 2B and 2C. Of band with respect to change of long side dimension L in the longitudinal direction of ground pattern 13 Are respectively shown.
  • the antenna pattern 12 is formed in an L-shape having a total length equal to / of the free-space wavelength, and a long piece of the L-shape is parallel to one side of the ground pattern 13.
  • the tip of the short piece is disposed adjacent to one side thereof. The tip of the short side constitutes the feeding point of the antenna.
  • the band of the antenna varies depending on the change in the size of the ground pattern 13.
  • the size of a general mobile terminal equipped with an antenna is designed with emphasis on incidental conditions such as easy to hold and easy to put in a pocket, etc. Therefore, the dielectric built into the housing of the mobile terminal
  • the size of the body substrate 11 or the size of the ground pattern 13 is subject to design restrictions.
  • Figures 2B and 2C suggest that under such circumstances, the size of the ground pattern 13 that can be accommodated in the housing is not always the optimal size for antenna band identification.
  • the ground size and the band characteristics of the antenna are measured in advance. From the band characteristics of the antenna due to the size of the Darland pattern 13, the ground pattern 13 on the dielectric substrate 11 is selected and added to the ground pattern 16 for adjustment of the flexible substrate 15 to an appropriate size.
  • it is possible to expand and optimize the band characteristic by adjusting the distance so as to approach L 120 mm.
  • the reflection characteristics of the antenna feed point including L 90 mm and 120 mm in FIGS. It will be as shown in Figure 2D.
  • the short side dimension W of the ground pattern 13 in the short side direction is W
  • the band characteristic changes in the same manner as when the value of the long side is changed.
  • the bandwidth can be expanded and optimized by adjusting the adjustment ground pattern 19 of the flexible substrate 18 to a size that maximizes the antenna band and additionally connecting it from the characteristic diagram.
  • the dimensions of the adjustment ground patterns 16 and 19 are determined by adding the dimensions of the adjustment ground patterns 16 and 19 to the dimensions of the ground pattern 13 based on the measurement results of the ground size and the antenna band characteristics in advance.
  • the band is selected to be optimal.
  • the additionally connected adjustment ground patterns 16 and 19 follow the nearest inner wall surface (inner surface) of the housing 10 of the portable terminal or the like due to the flexible properties of the flexible substrates 15 and 18. Can be assembled by bending.
  • the specific connection between the first connection portions 14a and 14b of the ground substrate 13 of the dielectric substrate 11 and the second connection portions 17 and 20 of the adjustment ground patterns 16 and 19 of the flexible substrates 15 and 18 Examples include a connection structure in which soldering is performed directly, and a connector structure in which male and female connectors are separately arranged and then fitted and connected.
  • the lengths of the first connecting portions 14 a and 14 b in the longitudinal direction are substantially the same as the long side or the short side of the ground pad 13.
  • the longitudinal size of the first connection portion 14b is the same as the short side of the daland pattern 13.
  • the number of the first connection portions 14a and 14b in the ground pattern 13 of the dielectric substrate 11 used here and the number of each of the flexible substrates 15 and 18 and the second connection portions 17 and 20 is 2 is assumed. As described above, these numbers are only examples, and the number of 1 to 3 can be arbitrarily selected according to the number of sides of the rectangular ground pattern.
  • the area occupied by the antenna pattern 12 on the dielectric substrate 11 is small, and the first connection portion 1
  • the second connecting portions 17 and 20 in the adjustment ground patterns 16 and 19 of the flexible substrates 15 and 18 connected to 4a and 14b and the flexible substrates 15 and 18 to be connected thereto need only have a small occupied area. Therefore, the antenna mounting area can be reduced, and the area for mounting accessories such as other circuit components and functional components can be increased. The antenna characteristics can be improved in a smaller antenna mounting area.
  • the antenna pattern 12 and the ground pattern 13 may be formed so as to be exposed on the substrate, respectively, or may be accommodated between layers of the stacked substrates.
  • FIGS. 3A to 3C show a wideband antenna according to a second embodiment of the present invention, in which the arrangement of the flexible substrates 15 and 18 provided in the wideband antenna according to the first embodiment is changed.
  • 1 shows the basic configuration.
  • Fig. 3A shows a plan view of the expanded components
  • Fig. 3B shows a side view in the longitudinal direction of the assembled state
  • Fig. 3C shows a side view in the short direction of the assembled state.
  • the broadband antenna according to the present embodiment differs from the first embodiment in that the flexible substrates 15 and 18 are formed in the housing 10 with the dielectric substrates 11 and The difference is that it is bent and deployed in the space between 0 and 0. More specifically, each of the flexible substrates 15 and 18 housed and arranged in the housing 10 has an adjustment ground pattern 16 and 19 between the inner wall surface of the housing 10 and the dielectric substrate 11 respectively. It is deployed in a meandering shape in the space.
  • the antenna mounting area is reduced, and the band characteristics of the antenna can be easily improved.
  • FIG. 4A to 4C show the basic configuration of the antenna according to the third embodiment of the present invention.
  • FIG. 4A is a plan view
  • FIG. 4B is a side view in the longitudinal direction
  • FIG. Shows side views in the short direction.
  • the antenna according to the present embodiment is different from that according to the first embodiment in that an elastic conductive contact 21 is used instead of using each of the flexible substrates 15 and 18.
  • Two conductive thin-film ground planes 22 are formed on two inner wall surfaces, and one end of each contact 21 is connected to the vicinity of each adjacent edge in the ground pattern 13 of the dielectric substrate 11. In that they were connected at equal intervals, and that the other end of each contact 21 was connected to each thin film ground pattern 22 on the inner wall adjacent to the housing 10 at equal intervals. different.
  • the rectangular dielectric substrate 11 provided in the housing 10 has a length L such that the entire pattern length is 1 Z4 of the free space wavelength.
  • Antenna pattern 12 made of a conductive thin film formed in a U-shape, and a plurality of equidistant positions near two adjacent edges, which are provided so as to extend from the vicinity of the antenna pattern 12
  • the contacts 21 having elasticity are formed as conductive connection pieces, and one ends of the respective contacts 21 are connected to equidistant positions near two adjacent edges in the daland pattern 13.
  • two conductive thin-film dust pads 22 are further formed on two adjacent inner wall surfaces.
  • the vicinity of the other end of each contact 21 is pressed against the thin film ground pattern 22 at the same distance from the nearest one, so that each contact 21 follows the nearest inner wall surface of the housing 10. It is bent and arranged.
  • the size of the thin-film ground path 22 is adjusted in advance so that the antenna band is maximized, and the ground 13 and each thin-film ground path 22 are conductively connected, so that the optimum A broadband structure is obtained.
  • two thin film ground patterns 22 formed on two adjacent inner wall surfaces of the housing 10 are formed by depositing a conductive material on the inner wall surface of the housing 10 by vapor deposition. Formed by film or by applying conductive material Can be exemplified.
  • the connection configuration of the ground pattern 13 and the thin film ground patterns 22 is merely an example. Further, the form of the contact 21 may be, for example, any of a spring pin, a panel, and a gasket.
  • the area occupied by the antenna pattern 12 on the dielectric substrate 11 is small, and the equally spaced positions near the adjacent sides ⁇ ⁇ ⁇ ⁇ of the ground pattern 13 and the housing
  • Each of the contacts 21 connects between the two thin film ground patterns 22 provided on two adjacent inner wall surfaces 10 at equal intervals.
  • the antenna mounting area can be reduced, the area for mounting accessories such as other circuit components and functional components can be increased, and the antenna characteristics can be easily improved.
  • the overall ground size can be changed by adding the adjustment ground pattern or the thin film ground pattern to the ground pattern.
  • the band of the antenna can be changed.
  • the antenna band can be optimized, and the antenna can be assembled in advance.
  • the size of the thin-film ground pattern can be adjusted to maximize the antenna bandwidth. Therefore, the antenna mounting area is small and the antenna bandwidth can be assembled as a wideband structure having the maximum antenna bandwidth, and a housing of the same size as the conventional case can be applied.

Abstract

L'invention concerne une antenne à bande large comprenant un substrat diélectrique (11) doté d'un diagramme d'antenne en forme de L (12) et d'un motif de masse rectangulaire (13) placé à côté du diagramme d'antenne et des substrats souples (15, 18) présentant, respectivement, des motifs de masse (16, 19) reliés aux deux côtés du motif de masse (13). Les substrats souples (15, 18) sont disposés de manière souple le long de la surface de paroi interne du boîtier (10).
PCT/JP2003/004485 2002-04-09 2003-04-09 Antenne et procede d'ajustement de bande d'antenne WO2003085778A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002106265A JP2003304111A (ja) 2002-04-09 2002-04-09 アンテナ
JP2002-106265 2002-04-09

Publications (1)

Publication Number Publication Date
WO2003085778A1 true WO2003085778A1 (fr) 2003-10-16

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WO (1) WO2003085778A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1583172A3 (fr) * 2004-03-30 2006-01-04 Nec Corporation Poste de radiocommunications avec antenne integreé
EP2015548A1 (fr) * 2007-06-21 2009-01-14 Research In Motion Limited Dispositif de communications sans fil mobiles incluant des éléments de formations de faisceau électriquement flottant et électriquement conducteur et procédés correspondants
US7990323B2 (en) 2007-06-21 2011-08-02 Research In Motion Limited Mobile wireless communications device including electrically conductive, electrically floating beam shaping elements and related methods

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100731161B1 (ko) 2005-12-29 2007-06-22 엘지전자 주식회사 다중 대역 통신 기기
JP5087225B2 (ja) * 2006-01-18 2012-12-05 ミツミ電機株式会社 アンテナ装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11177327A (ja) * 1997-12-09 1999-07-02 Nec Saitama Ltd 逆ｆアンテナ装置
JP2001326521A (ja) * 2000-05-18 2001-11-22 Sharp Corp 積層パターンアンテナ及びそれを備えた無線通信装置
JP2002009521A (ja) * 2001-04-27 2002-01-11 Mitsubishi Electric Corp 携帯無線機
JP2002335180A (ja) * 2001-05-08 2002-11-22 Mitsubishi Electric Corp 携帯電話機
JP2003060417A (ja) * 2001-08-08 2003-02-28 Matsushita Electric Ind Co Ltd 無線機用アンテナ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11177327A (ja) * 1997-12-09 1999-07-02 Nec Saitama Ltd 逆ｆアンテナ装置
JP2001326521A (ja) * 2000-05-18 2001-11-22 Sharp Corp 積層パターンアンテナ及びそれを備えた無線通信装置
JP2002009521A (ja) * 2001-04-27 2002-01-11 Mitsubishi Electric Corp 携帯無線機
JP2002335180A (ja) * 2001-05-08 2002-11-22 Mitsubishi Electric Corp 携帯電話機
JP2003060417A (ja) * 2001-08-08 2003-02-28 Matsushita Electric Ind Co Ltd 無線機用アンテナ装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1583172A3 (fr) * 2004-03-30 2006-01-04 Nec Corporation Poste de radiocommunications avec antenne integreé
EP2015548A1 (fr) * 2007-06-21 2009-01-14 Research In Motion Limited Dispositif de communications sans fil mobiles incluant des éléments de formations de faisceau électriquement flottant et électriquement conducteur et procédés correspondants
US7990323B2 (en) 2007-06-21 2011-08-02 Research In Motion Limited Mobile wireless communications device including electrically conductive, electrically floating beam shaping elements and related methods
US8314738B2 (en) 2007-06-21 2012-11-20 Research In Motion Limited Mobile wireless communications device including electrically conductive, electrically floating beam shaping elements and related methods

Also Published As

Publication number Publication date
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