WO2010023752A1 - Antenne allongée - Google Patents

Antenne allongée Download PDF

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Publication number
WO2010023752A1
WO2010023752A1 PCT/JP2008/065546 JP2008065546W WO2010023752A1 WO 2010023752 A1 WO2010023752 A1 WO 2010023752A1 JP 2008065546 W JP2008065546 W JP 2008065546W WO 2010023752 A1 WO2010023752 A1 WO 2010023752A1
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WO
WIPO (PCT)
Prior art keywords
antenna
base material
power feeding
longitudinal
outer peripheral
Prior art date
Application number
PCT/JP2008/065546
Other languages
English (en)
Japanese (ja)
Inventor
雅美 鈴木
智之 藤枝
Original Assignee
パイオニア株式会社
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 パイオニア株式会社 filed Critical パイオニア株式会社
Priority to JP2010526472A priority Critical patent/JPWO2010023752A1/ja
Priority to PCT/JP2008/065546 priority patent/WO2010023752A1/fr
Priority to EP08809613A priority patent/EP2330686A1/fr
Publication of WO2010023752A1 publication Critical patent/WO2010023752A1/fr

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    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • 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
    • H01Q1/40—Radiating elements coated with or embedded in protective material

Definitions

  • the present invention relates to a small antenna.
  • film antennas are often used as terrestrial digital broadcast receiving antennas in vehicles.
  • Patent Documents 1 and 2 describe examples of small antennas used for mobile phones and the like.
  • the longitudinal antenna according to the first aspect of the present invention has a longitudinal shape and is at least in contact with the first base material having a different dielectric constant between the outer peripheral portion and the central portion, and the outer peripheral portion of the first base material. And it is provided with the feed element arrange
  • a longitudinal antenna according to a preferred embodiment of the present invention has a longitudinal shape, and is at least in contact with a first base material having a different permittivity between an outer peripheral portion and a central portion, and an outer peripheral portion of the first base material. And a power feeding element disposed along the shape of the outer peripheral portion, and a non-excitation element disposed close to the power feeding element.
  • the first base material is made of a dielectric material such as ceramic, and the outer peripheral portion and the central portion have different dielectric constants.
  • the power feeding element is at least partially in contact with the outer peripheral portion, and is disposed along the shape of the outer peripheral portion. And a non-excitation element is arrange
  • the power feeding element is disposed on the outer peripheral portion of the base material, that is, outside the central portion of the base material.
  • the power feeding part and the tip of the power feeding element come close to each other, and electromagnetic coupling may occur between them.
  • the dielectric constant of the center portion of the base material interposed between the power feeding portion and the power feeding element is different from that of the outer peripheral portion, such electromagnetic coupling can be suppressed.
  • the dielectric constant at the center of the substrate is preferably smaller than the dielectric constant at the outer periphery.
  • the central portion of the first base material is hollowed out. Therefore, the presence of air in the central portion suppresses electromagnetic coupling between the power feeding portion and the tip portion of the power feeding element.
  • the first base material has a slot-shaped planar shape in which only the central portion is cut out.
  • the first base material has a C-shaped planar shape in which a part of the outer peripheral portion at the center in the longitudinal direction is further cut.
  • the feeding element has a width of a portion in contact with the outer peripheral portion in the short direction of the first base material, and the outer periphery in the longitudinal direction of the first base material. It is larger than the width of the part in contact with the part.
  • the feeding element has a plurality of portions in contact with the outer peripheral portion in the short direction of the first base material.
  • the longitudinal antenna includes a second base material having a dielectric constant lower than a dielectric constant of an outer peripheral portion of the first base material, and the feed element and the non-excitation element include the first base 2 base materials.
  • the feeding element and the non-excitation element are formed on the second base material, and the dielectric base material is disposed thereon. If a feed element or a non-excitation element is formed on a dielectric substrate, the manufacturing cost increases. By forming the power feeding element and the non-excitation element on the second base material, the manufacturing cost can be reduced.
  • the feeding portion of the feeding element and the two end portions of the feeding element are arranged to face each other in the vicinity of the center position in the longitudinal direction of the second base material. ing.
  • electromagnetic coupling is likely to occur between the feeding portion and the two end portions of the feeding element, but such a coupling is effective because the dielectric constant of the central portion of the substrate is different from that of the outer peripheral portion. To be suppressed.
  • the power feeding element is in contact with the first base material in the vicinity of two ends of the power feeding element or in a place excluding the vicinity of the power feeding part.
  • the longitudinal antenna is enclosed in a resin case.
  • corrosion of conductor parts such as a feed element and a non-excitation element, can be prevented.
  • the above longitudinal antenna is disposed close to a dielectric having an area larger than the area of the first base material.
  • the resonance frequency of the antenna can be lowered, and the antenna can be downsized accordingly.
  • FIG. 1A is a perspective view of an antenna according to the first embodiment.
  • the antenna 100 includes a longitudinal base 1, a feed element 2, and a non-excitation element 3.
  • the length and width of the feed element 2 and the non-excitation element 3 and the length, width, and thickness of the base material 1 are determined so that terrestrial digital broadcasting can be received satisfactorily.
  • the substrate 1 has a longitudinal shape (plate shape, stick shape) and is made of a dielectric material such as ceramic.
  • the dielectric constant of the substrate 1 is about 20
  • the length of the substrate 1 is about 100 to 150 mm
  • the thickness of the substrate 1 is about 3 to 5 mm.
  • the center part of the base material 1 is hollowed out in a rectangular shape, and a cutout part 1c is provided. Moreover, the substantially center part in the longitudinal direction of the base material 1 is cut
  • the cut-out portion 1c corresponds to the “center portion” of the base material in the present invention, and the portion of the base material 1 on the outer periphery of the cut-out portion 1c corresponds to the “outer peripheral portion” of the base material.
  • the power feeding element 2 is an element that is electrically excited from the outside, and is formed by arranging a linear element by bending a plurality of elements along the outer periphery of the substrate 1.
  • the power feeding element 2 has a power feeding portion 2 s at the center in the longitudinal direction of the substrate 1.
  • a signal received by the antenna 100 is extracted from the power feeding unit 2s.
  • the feed element 2 has straight portions 2a, 2b, 2c and 2d.
  • the straight portion 2 a extends from the power supply portion 2 s to the both ends in the longitudinal direction of the base 1 from the upper surface 1 a of the base 1.
  • the straight portion 2b extends along the both ends of the base material 1 in the short direction of the base material 1, and further extends on the side surface 1b of the base material 1 to the bottom surface side.
  • the straight line portion 2 c is provided on the inner side of the end portion in the longitudinal direction of the substrate 1 and substantially parallel to the straight line portion 2 b.
  • the straight portion 2d extends on the side surface 1b of the substrate 1 along the bottom surface in the center direction of the substrate 1.
  • the feed element 2 is arranged so as to surround the cut-out portion 1c.
  • the two front end portions 2t of the power feeding element 2 are arranged in positions near the power feeding portion 2s through the cutout portion 1c in the vicinity of the center of the base 1 in the longitudinal direction.
  • the straight portions 2b and 2c of the feed element 2 are branched between the straight portions 2a and 2d, but the thickness of one straight portion is increased by adjusting the interval between the straight portions 2b and 2c. The same effect as the case can be obtained.
  • the non-excitation element 3 is a linear element, and is provided on the upper surface 1 a of the substrate 1.
  • the non-excitation element 3 is disposed in the vicinity of the straight line portion 2 a of the power feeding element 2 and substantially parallel to the straight line portion 2 a.
  • the non-exciting element 3 has a role of setting the antenna characteristics to the two-resonance state and expanding the band in which transmission and reception can be performed by being arranged close to the feeding element 2.
  • the antenna 100 includes a power feeding element 2 that is electrically excited from the outside and a non-excitation element 3 that is disposed in the vicinity thereof. Two resonance characteristics are provided in the frequency band.
  • the pattern of the feeding element 2 is obtained by bending a plurality of linear elements in accordance with the shape of the substrate 1. Thereby, the length of the feed element in the longitudinal direction can be shortened, and the entire antenna 100 can be reduced in size.
  • the feed element 2 when the feed element 2 is arranged along the outer peripheral shape of the longitudinal base material 1, the feed part 2s and the tip part 2t of the feed element 2 are close to each other. There is a problem that electromagnetic coupling occurs between the two and the characteristics of the antenna deteriorate. Therefore, in the present invention, in order to suppress the electromagnetic coupling between the power feeding portion 2s and the tip portion 2t of the power feeding element 2, the central portion of the longitudinal base material 1 is cut out to provide the cutout portion 1c. . When air is interposed between the power feeding unit 2s and the tip 2t of the power feeding element 2, the electromagnetic coupling between the two can be weakened. As a result, it is possible to suppress the deterioration of the characteristics of the intermediate portion between the two resonance characteristics, and an antenna having stable characteristics can be realized.
  • FIG. 1B is a perspective view of an antenna 110 according to a comparative example.
  • the antenna 110 of the comparative example has the same structure as the antenna 100 except that the cut-out portion 1c is not provided.
  • FIG. 2A shows the impedance characteristics of the antenna 100 of the first embodiment of the present invention
  • FIG. 2B shows the impedance characteristics of the antenna 110 of the comparative example.
  • the horizontal axis represents frequency
  • the vertical axis represents impedance.
  • the graph Re in the figure shows the real number (Real) component of the impedance
  • the graph Im shows the imaginary number (Imaginary) component.
  • the maximum value of the real component Re is smaller and the change of the imaginary component Im is smaller in the antenna 100 of the first embodiment. That is, the antenna 100 of the first embodiment is more stable with less change in impedance characteristics.
  • FIG. 3 (a) shows the VSWR (Voltage Standing Wave Ratio) of the antenna 100 of the first embodiment
  • FIG. 3 (b) shows the VSWR of the antenna 110 of the comparative example. Since the antenna 100 of the first embodiment has a smaller change in impedance characteristics, a change in VSWR within a desired band is smaller. In particular, it can be seen that the characteristic deterioration between the two resonance points is suppressed. As a result, even if the reception frequency band changes, there is no significant difference in the reception power, and there is an advantage that the reception level becomes almost flat.
  • the antenna 100 shown in FIG. 1 (a) has a C-shaped planar shape. However, as in the antenna 100a shown in FIG. It is good also as a shape. Also in this case, an effect of suppressing electromagnetic coupling between the power feeding portion 2s and the tip portion 2t of the power feeding element 2 can be obtained by the cutout portion 1c.
  • the non-exciting element 3 may be provided on the inner side of the feeding element 2, that is, on the cut-out portion 1c side. 4B shows an example of a slot antenna, the non-exciting element 3 may be provided inside the feeding element 2 in the C-shaped antenna 100 shown in FIG.
  • the antenna 100 by enclosing the antenna 100 in the resin case 7, it is possible to prevent the user from directly touching a conductor portion constituting the element. Thereby, corrosion of the element due to rust or the like can be prevented.
  • the antennas 100a and 100b may be similarly enclosed in a resin case.
  • the antenna 100 when the antenna 100 is disposed close to the dielectric material 8 having an area relatively larger than the size of the antenna 100, the antenna 100 is installed alone (the periphery is covered with air). The resonance frequency can be lowered compared to the case of Thereby, the antenna can be further reduced in size. The same applies to the antennas 100a and 100b. At this time, the antenna may or may not be enclosed in the resin case 7.
  • the dielectric material 8 in the case of a vehicle-mounted antenna, for example, a windshield of a vehicle, a dashboard, and the like can be cited.
  • FIG. 6A is a perspective view of an antenna according to the second embodiment.
  • the antenna 200 includes a longitudinal base 11, a feeding element 12, and a non-excitation element 13.
  • the length and width of the power feeding element 12 and the non-excitation element 13 and the size, such as the length, width, and thickness of the base material 11 are determined so that terrestrial digital broadcasting can be satisfactorily received.
  • the substrate 11 has a longitudinal shape and is made of a dielectric material such as ceramic.
  • the dielectric constant of the substrate 1 is about 20
  • the length of the substrate 11 is about 100 to 150 mm
  • the thickness of the substrate 11 is about 3 to 5 mm.
  • the center part of the base material 11 is hollowed out in a rectangular shape, and a cutout part 11c is provided.
  • the base material 11 has a slot-type planar shape.
  • the cutout portion 11c corresponds to the center portion of the base material, and the portion of the base material 11 on the outer periphery of the cutout portion 11c corresponds to the outer peripheral portion of the base material.
  • the power feeding element 12 is formed by arranging a linear element by bending a plurality of elements along the outer periphery of the substrate 11.
  • the power feeding element 12 has a power feeding portion 12 s at the center in the longitudinal direction of the base material 11.
  • the power feeding element 12 has a plurality of linear portions 12 a, 12 b, 12 c and 12 d provided on the upper surface 11 a of the substrate 11.
  • the straight line portion 12a extends from the power supply portion 12s to the vicinity of both ends of the cutout portion 11c in the longitudinal direction of the base material 11.
  • the straight portion 12b extends along the outer periphery of the base material 11 to the end in the longitudinal direction.
  • the straight portion 12 c extends in the short direction of the base material 11 at both ends in the longitudinal direction of the base material 11.
  • the straight portion 12d extends from the longitudinal end of the substrate 11 in the central direction.
  • the power feeding element 12 is disposed so as to surround the cut-out portion 11c.
  • the power feeding element 12 is formed only on the upper surface 11a of the base material 11, and is not formed on the side surface of the base material 11. Can be easily formed, and the manufacturing cost can be reduced.
  • the non-excitation element 13 is a linear element, and is provided on the upper surface 11 a of the substrate 11.
  • the non-excitation element 13 is disposed in the vicinity of the straight line portion 12a of the power feeding element 12 and substantially parallel to the straight line portion 12a.
  • a central portion of the longitudinal base 11 is cut out to provide a cutout portion 11c. Yes.
  • the electromagnetic coupling between the two can be weakened.
  • the antenna 210 of the comparative example has the same structure as the antenna 200 except that the cut-out portion 1 c is not provided.
  • the following characteristics are shown in FIGS. 6B and 6C, in which the antennas 200 and 210 are enclosed in the resin case 7, and a dielectric material having a relatively large area as shown in FIG. 8 is obtained when it is arranged close to 8.
  • FIG. 7A shows the impedance characteristics of the antenna 200 of the second embodiment of the present invention
  • FIG. 7B shows the impedance characteristics of the antenna of the comparative example.
  • the horizontal axis represents frequency
  • the vertical axis represents impedance.
  • the graph Re in the figure shows the real component of the impedance
  • the graph Im shows the imaginary component.
  • the antenna 200 of the second embodiment has a smaller maximum value of the real component Re and a smaller change of the imaginary component Im. That is, the antenna 200 of the second embodiment is more stable with less change in impedance characteristics.
  • FIG. 8A shows the VSWR of the antenna 200 of the second embodiment
  • FIG. 8B shows the VSWR of the antenna of the comparative example. Since the antenna 200 of the second embodiment has a smaller change in impedance characteristics, a change in VSWR within a desired band is smaller. In particular, it can be seen that the characteristic deterioration between the two resonance points is suppressed. As a result, even if the reception frequency band changes, there is no significant difference in the reception power, and there is an advantage that the reception level becomes almost flat.
  • the characteristic deterioration of the intermediate portion of the two resonance characteristics can be reduced also by making the widths of the respective linear portions 12a to 12d constituting the feeding element 12 different. Suppressed.
  • the non-excitation element 13 may be provided on the inner side of the feeding element 12, that is, on the cut-out portion 11c side.
  • the antenna 200 is an example of a slot-shaped antenna
  • the base material 11 may have a C-shaped planar shape as in the antenna 100 shown in FIG.
  • the resonance frequency can be increased as compared with the case where the antenna 200 is installed alone. Can be lowered. Thereby, the antenna can be further reduced in size. At this time, the antenna may or may not be enclosed in the resin case 7.
  • FIG. 9A is a perspective view of an antenna according to the third embodiment
  • FIG. 9B is an exploded perspective view thereof.
  • the antenna 300 includes a longitudinal substrate 21, a power feeding element 22, a non-excitation element 23, and a longitudinal base material 24.
  • the external dimensions of the substrate 21 and the base material 24 are substantially the same.
  • the lengths and widths of the power feeding element 22 and the non-excitation element 23 and the sizes such as the lengths, widths, and thicknesses of the substrate 21 and the base material 24 are determined so that digital terrestrial broadcasting can be received satisfactorily.
  • the substrate 21 is a low dielectric constant substrate, and an example thereof includes an FR4 printed circuit board used for pattern wiring of an electronic circuit. As shown in FIG. 9B, the feeding element 22 and the non-excitation element 23 are formed on the substrate 21. The substrate 21 is not formed with a cut-out portion or the like.
  • the feeding element 22 is formed by arranging a linear element by bending a plurality of elements along the outer periphery of the substrate 21.
  • the power feeding element 22 has a power feeding portion 22 s at the center in the longitudinal direction of the substrate 21.
  • the power feeding element 22 has a plurality of linear portions 22 a, 22 b and 22 c provided on the upper surface of the substrate 21.
  • the straight portion 22 a extends from the power supply portion 22 s to both ends of the substrate 21 in the longitudinal direction of the substrate 21.
  • the straight portion 22b extends along the outer periphery of the substrate 21 to the end in the short direction.
  • the straight portion 22 c extends from the longitudinal end of the substrate 21 in the central direction.
  • the non-excitation element 23 is a linear element and is provided on the upper surface of the substrate 21.
  • the non-excitation element 23 is disposed in the vicinity of the linear portion 22a of the power feeding element 22 and substantially parallel to the linear portion 22a.
  • the base material 24 has a longitudinal shape and is made of a dielectric material such as alumina.
  • the base material 24 is disposed on the surface of the substrate 21 on which the power feeding element 22 and the non-excitation element 23 are formed, and functions as a dielectric cover.
  • the dielectric constant of the base material 24 is higher than the dielectric constant of the substrate 21.
  • the relative dielectric constant of the substrate 21 using the FR4 printed circuit board is about 4 to 5
  • the relative dielectric constant of the base material 24 is about 8 to 10.
  • the length of the substrate 21 and the base material 24 is about 100 to 150 mm
  • the thickness of the substrate 21 is about 1 mm
  • the thickness of the base material 24 is about 2 mm.
  • the central portion of the base material 24 is cut into a rectangular shape, and a cutout portion 24c is provided.
  • the base material 24 has a slot-type planar shape.
  • the cutout portion 24c corresponds to the center portion of the base material, and the portion of the base material 24 in the outer periphery of the cutout portion 24c corresponds to the outer peripheral portion.
  • the pattern of the feeding element 22 and the non-excitation element 23 is formed on the substrate 21 such as a low-cost high-frequency circuit substrate instead of the dielectric base material 24, and the dielectric is not formed thereon.
  • a body substrate 24 is placed. Since the cost of forming the element on the substrate 21 is lower than that of forming the element on the dielectric substrate itself, the cost for manufacturing the antenna can be reduced.
  • a central portion of the longitudinal base material 24 is cut out to provide a cutout portion 24c. Yes.
  • the electromagnetic coupling between the power feeding portion 22s and the tip portion 22t of the power feeding element 22 can be weakened.
  • the substrate 21 is not provided with a hollow portion in the present embodiment, so that the substrate 21 exists between the power feeding portion 22s and the tip portion 22t of the power feeding element 22. Will do.
  • the dielectric constant of the substrate 21 is sufficiently lower than the dielectric constant of the base member 24 as described above, even when the substrate 21 is present, the electromagnetic coupling between the power feeding portion 22s and the tip portion 22t of the power feeding element 22 is achieved. The effect which suppresses is acquired.
  • the dielectric constant of the printed circuit board of FR4 used as the substrate 21 is about 4.5, and electromagnetic coupling can occur when the received signal frequency is a high frequency of about several GHz.
  • this embodiment assumes reception of terrestrial digital broadcasting, and if the relative permittivity of this base material 21, there is almost no electromagnetic coupling to signals in the band of terrestrial digital broadcasting. Therefore, it is not necessary to form a cutout portion in the substrate 21.
  • the characteristics of the antenna of the third embodiment will be described. The following characteristics were obtained when the antenna 200 of the third embodiment was enclosed in the resin case 7 and further placed close to the dielectric material 8 having a relatively large area as shown in FIG. Is.
  • FIG. 10A shows impedance characteristics of the antenna 300 according to the third embodiment of the present invention.
  • FIG. 10B shows the impedance characteristics of the antenna of the second embodiment of the present invention.
  • the horizontal axis represents frequency, and the vertical axis represents impedance.
  • the graph Re in the figure shows the real component of the impedance, and the graph Im shows the imaginary component.
  • the antenna 300 of the third embodiment also has a small maximum value of the real component Re and a small change in the imaginary component Im.
  • FIG. 11A shows the VSWR of the antenna 300 of the third embodiment.
  • FIG. 10B shows the VSWR of the antenna 200 of the second embodiment. Both show stable two-resonance characteristics within the frequency band of terrestrial digital broadcasting.
  • the width of each of the linear portions 22a to 22c constituting the feeding element 22 is also made different, so that the intermediate portion of the two resonance characteristics can be obtained. Deterioration of characteristics is suppressed.
  • the non-excitation element 23 may be provided on the inner side of the feeding element 22, that is, on the side of the cutout portion 24c.
  • the antenna 200 is an example of a slot-shaped antenna
  • the base member 24 may have a C-shaped planar shape like the antenna 100 shown in FIG.
  • the antenna 300 when the antenna 300 is disposed close to the dielectric material 8 having an area relatively larger than the size of the antenna 300, when the antenna 300 is installed alone (the periphery is covered with air).
  • the resonance frequency can be lowered as compared with the case of Thereby, the antenna can be further reduced in size.
  • the antenna may or may not be enclosed in the resin case 7.
  • the amplifier circuit 27 can be mounted inside the cutout portion 24c of the base material 24. Thereby, the thickness of the antenna 300 including the amplifier circuit 27 can be reduced.
  • a signal received by the elements 22 and 23 of the antenna 300 and output from the power feeding unit 22s is amplified by the amplifier circuit 27 and supplied to an external circuit through the cable 27a.
  • the amplifier circuit 28 may be formed on the substrate 21 as shown in FIG. That is, after the feeding element 22, the non-excitation element 23 and the amplifier circuit 28 are formed on the substrate 21, the dielectric base material 24 is mounted on the substrate 21. Also by this, since the electronic components included in the amplifier circuit 28 are accommodated in the cutout portion 24c of the substrate 24, the thickness of the antenna 300 itself including the amplifier circuit 28 can be reduced.
  • FIGS. 13A to 13C show modifications of the dielectric base material 24.
  • the base material 24 should just cover the place where the wavelength contraction effect is effectively obtained on the pattern of the power feeding element 22 formed on the substrate 21.
  • the place where the wavelength contraction effect is effectively obtained refers to a portion where the electromagnetic field coupling between the patterns is strong, and this portion may be covered. This location is determined by simulation or experiment. For example, the vicinity of the end portion of the power feeding element and the vicinity of the power feeding portion are not necessarily covered. Therefore, the substrate 24 has a C-shape as shown in FIG. 13A, a concave shape as shown in FIG. 13B, and a slot shape shown in FIG. Such a concave character can be divided into two.
  • all of the dielectric bases 1, 11, and 24 have a rectangular planar shape, but the application of the present invention is not limited to this. If the length in one direction is a longitudinal shape that is sufficiently longer than the length in the direction perpendicular thereto, an elliptical shape or a rhombic planar shape may be used.
  • the hollow portions 1c, 11c, and 24c formed in the dielectric base materials 1, 11, and 24 are spaces, and air is present.
  • a dielectric having a dielectric constant sufficiently lower than the dielectric constant of the base materials 1, 11, 24 may be disposed inside the cut-out portions 1 c, 11 c, 24 c.
  • the power feeding elements 2, 12, and 22 are all in contact with the dielectric base materials 1, 11, and 24, but this is not essential, and the dielectric base material is the power feeding element. It is only necessary to cover a portion where the above wavelength contraction effect can be obtained. Therefore, the arrangement may be such that a part of the feed element is not in contact with the dielectric substrate.
  • the feed elements 2, 12, and 22 are all linear, but the application of the present invention is not limited to this.
  • the power feeding element may have a zigzag shape or a meander shape.
  • the shape of the dielectric bases 1, 11, and 24 is a rectangular parallelepiped, but the present invention is not limited to this.
  • the base material may have an elliptical shape or a rhombus shape in plan view.
  • the power feeding element may be disposed along the outer periphery of the shape, or may be disposed in a rectangular shape.
  • the present invention can be used for a receiving antenna for terrestrial digital broadcasting mounted on a vehicle. It can also be used as an antenna for receiving terrestrial digital broadcasts for small portable devices such as portable TVs and portable game machines.

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Abstract

L’invention concerne une antenne allongée comprenant un matériau de base, un élément d’alimentation et un élément non excitant. Le matériau de base est allongé et la permittivité est différente dans la partie périphérique externe et dans la partie centrale. L’élément d’alimentation est en contact au moins avec la partie périphérique externe et est disposé le long du profil de la partie périphérique externe. L’élément non excitant est disposé à proximité de l’élément d’alimentation. L’élément d’alimentation est ainsi disposé dans la partie périphérique externe du matériau de base, c’est-à-dire sur l’extérieur de la partie centrale de celui-ci. Lorsque l’élément d’alimentation est disposé le long de la partie périphérique externe du matériau de base allongé, la partie d’alimentation est proche de l’extrémité distale de l’élément d’alimentation et un couplage de champ électromagnétique s’établit entre elles. Toutefois, étant donné que la partie centrale du matériau de base est suffisamment renfoncée et que la permittivité est faible par rapport à la partie périphérique externe, un tel couplage de champ électromagnétique peut être supprimé.
PCT/JP2008/065546 2008-08-29 2008-08-29 Antenne allongée WO2010023752A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2010526472A JPWO2010023752A1 (ja) 2008-08-29 2008-08-29 長手形状アンテナ
PCT/JP2008/065546 WO2010023752A1 (fr) 2008-08-29 2008-08-29 Antenne allongée
EP08809613A EP2330686A1 (fr) 2008-08-29 2008-08-29 Antenne allongée

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Application Number Priority Date Filing Date Title
PCT/JP2008/065546 WO2010023752A1 (fr) 2008-08-29 2008-08-29 Antenne allongée

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WO2010023752A1 true WO2010023752A1 (fr) 2010-03-04

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JP (1) JPWO2010023752A1 (fr)
WO (1) WO2010023752A1 (fr)

Citations (7)

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JPS5025785B1 (fr) * 1969-10-09 1975-08-26
JPS60129708U (ja) * 1984-02-09 1985-08-30 日本アンテナ株式会社 アンテナ
JPH0738325A (ja) * 1993-07-19 1995-02-07 Hitachi Cable Ltd 広帯域ダイポールアンテナ
WO2001018909A1 (fr) * 1999-09-09 2001-03-15 Murata Manufacturing Co., Ltd. Antenne montee en surface et dispositif de communication dote d'une antenne montee en surface
JP2002217628A (ja) 2001-01-16 2002-08-02 Furukawa Electric Co Ltd:The 小型アンテナ
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JP2005303637A (ja) 2004-04-09 2005-10-27 Furukawa Electric Co Ltd:The 多周波共用アンテナ及び小型アンテナ

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JPH0738325A (ja) * 1993-07-19 1995-02-07 Hitachi Cable Ltd 広帯域ダイポールアンテナ
WO2001018909A1 (fr) * 1999-09-09 2001-03-15 Murata Manufacturing Co., Ltd. Antenne montee en surface et dispositif de communication dote d'une antenne montee en surface
JP2002217628A (ja) 2001-01-16 2002-08-02 Furukawa Electric Co Ltd:The 小型アンテナ
JP2004032776A (ja) * 2002-06-27 2004-01-29 Harris Corp 複合材料の誘電性基板を用いたダイポールアンテナ
JP2005303637A (ja) 2004-04-09 2005-10-27 Furukawa Electric Co Ltd:The 多周波共用アンテナ及び小型アンテナ

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