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WO2005078860A1 - Antenne - Google Patents

Antenne Download PDF

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Publication number
WO2005078860A1
WO2005078860A1 PCT/JP2005/001600 JP2005001600W WO2005078860A1 WO 2005078860 A1 WO2005078860 A1 WO 2005078860A1 JP 2005001600 W JP2005001600 W JP 2005001600W WO 2005078860 A1 WO2005078860 A1 WO 2005078860A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
antenna
ground
main radiation
ground conductor
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.)
Ceased
Application number
PCT/JP2005/001600
Other languages
English (en)
Japanese (ja)
Inventor
Kazuhiko Okawara
Kenichi Moue
Masahiro Ekawa
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.)
FDK Corp
Original Assignee
FDK 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
Application filed by FDK Corp filed Critical FDK Corp
Publication of WO2005078860A1 publication Critical patent/WO2005078860A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/385—Two or more parasitic elements
    • 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
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to a small antenna having stable antenna characteristics and a wireless communication device using the same.
  • the above-mentioned antenna has a basic principle of resonating a main radiation electrode having an effective electric length of about 1Z2 wavelength or about 1Z4 wavelength.
  • antennas can be miniaturized by loading them with capacitive or inductive reactance or dielectric or magnetic materials.
  • inductor and capacitor components can be connected in series or parallel to the antenna feed line.
  • a technique for lowering the resonance frequency of the antenna is widely used.
  • Patent Document 1 As a prior art of such a chip antenna, for example, Patent Document 1 is disclosed.
  • FIGS. 14A and 14B show a conventional example of a 1Z4 wavelength chip antenna 1 having a ground electrode 3 on the entire back surface opposite to the main radiation electrode 2 on the upper surface, and a mounting example on a circuit board.
  • Reference numeral 5 denotes a short-circuit electrode connecting the ground conductor 21 of the circuit board 20 and the main radiation electrode 2
  • reference numeral 6 denotes a power supply electrode connected to the power supply line 22 of the circuit board 20.
  • the chip antenna 1 having such a structure since the ground electrode 3 on the back surface and the main radiation electrode 2 on the top surface are strongly electromagnetically coupled, a force for obtaining stable antenna characteristics is reduced. It is known that, particularly when the chip antenna 1 is made thinner and the coupling strength becomes too strong, the bandwidth is reduced and the radiation efficiency is likely to be reduced.
  • the antenna 1 having the above-mentioned electrode structure is formed on a thin rectangular parallelepiped dielectric substrate of about 15 X 5 X 5 mm, a 1575.42 MHz antenna for GPS has a voltage standing wave ratio VSWR of 2
  • the fractional bandwidth is less than 0.5-1% and the radiation efficiency is as low as about 50%.
  • the antenna shape is reduced in size, the relative bandwidth and the radiation efficiency are remarkably deteriorated, and the antenna becomes impractical.
  • the chip antenna 1 having such a structure a wide bandwidth and a high radiation efficiency can be obtained in a small and low posture, but the area of the ground conductor 21, peripheral mounting parts (not shown), a shield case, a human body, and other nearby objects are obtained.
  • the antenna characteristics are easily deteriorated due to the influence of physical strength, and in addition, as shown in FIG. 15B, a relatively large area for mounting the chip antenna 1 on the circuit board 20 is required.
  • it is not suitable for high-density mounting because it is necessary to secure a conductor area.
  • the chip antenna 1 is configured on a small and thin dielectric substrate 4 of about 10 X 3 X 2 mm and mounted on the non-ground conductor area 20a (about 20 X 15 mm) on the circuit board 20,
  • the fractional bandwidth where VSW R is less than 2 is as wide as 5-6% and the radiation efficiency is as good as 90% or more, but the actual area on the circuit board 20 occupied by the antenna 1 is very large
  • it is not suitable for high-density mounting.
  • the resonance frequency is reduced by capacitively coupling the loading electrode 7 to the tip of the main radiating electrode 2, thereby enabling high-density mounting. This is the chip antenna 1 obtained.
  • This chip antenna 1 is formed on a dielectric base material 4 having the same size as that of FIGS. 15A and 15B and having a size of about 10 ⁇ 3 ⁇ 2 mm, and as shown in FIG.
  • a dielectric base material 4 having the same size as that of FIGS. 15A and 15B and having a size of about 10 ⁇ 3 ⁇ 2 mm, and as shown in FIG.
  • the radiation efficiency at which a VSWR of less than 2 can be obtained with a fractional bandwidth of about 12% or less is significantly reduced to 30-50%.
  • New electromagnetic coupling occurs between the ground conductor 21 and the main radiating electrode 2 of the chip antenna 1, and the resonance frequency and impedance greatly change, making matching difficult.Therefore, it may be necessary to redesign the antenna. Occurs.
  • Patent Document 1 discloses a chip antenna that stabilizes antenna characteristics with respect to an external structure. Since one of the main radiation electrodes is largely open, an electromagnetic shield is provided. The structure is inadequate and it is difficult to prevent the influence from the same direction.
  • Patent Document 1 JP-A-2002-158521
  • the present invention has been made in view of the above-mentioned drawbacks of the conventional antenna, and can easily perform impedance matching and resonance frequency adjustment, and can reduce the influence of a nearby object having a high degree of freedom in mounting.
  • the objective is to provide an antenna with excellent stability that is difficult to receive and a wireless communication device using the antenna.
  • the antenna in a small antenna using an image current (mapping) effect of an external ground conductor, in order to improve electromagnetic stability against external elements and obtain stable antenna characteristics, the antenna is mainly used. It was noted that the coupling between the radiation electrode and the ground conductor of the mounting substrate should be stabilized.
  • an antenna mounted on a portion of a circuit board having a feeder line and a ground conductor, at least a part of which faces the main radiation electrode, is a non-ground conductor region.
  • a power supply electrode connected to the power supply line, a main radiation electrode having one end connected to the power supply electrode, and a plurality of ground electrodes connected to the ground conductor, wherein the main radiation electrode includes: At least a part of a portion corresponding to the main radiation electrode is not grounded, and is arranged so as to be sandwiched at a predetermined distance by the ground electrode. It is characterized by being formed as a conductor region.
  • the main radiation electrode is shielded by the ground electrode formed on the same antenna at a predetermined distance, so that the main radiation electrode and the ground electrode are coupled in an electromagnetically stable state. Therefore, it is less likely to be affected by external elements such as a ground conductor on a circuit board located farther than the ground electrode, a nearby object, or a human body. This makes it possible to turn Stable antenna characteristics are obtained without being affected by the antenna mounting position of the road board.
  • an antenna mounted on a portion where at least a part of a portion facing a main radiation electrode of a circuit board having a feeder line and a ground conductor is a non-ground conductor region.
  • the low-potential portion is disposed so as to be sandwiched at a predetermined distance, and the surface opposite to the surface on which the main radiation electrode is formed is at least a part of a portion corresponding to the main radiation electrode. Is defined as an ungrounded conductor area. It is the butterflies.
  • the impedance matching of the antenna can be easily performed by adjusting the coupling capacitance between the main radiation electrode and the feed electrode and the arrangement of the short-circuit electrode. I can do it. It is also possible to use the low potential portion of the main radiation electrode as a part of the shield ground electrode.
  • the third embodiment of the present invention the first embodiment or the second embodiment described above. And an adjustment electrode that is capacitively coupled to the power supply electrode, the main radiation electrode, or the short-circuit electrode, or one or more of these electrodes, and that is connected to the ground conductor. Characteristic.
  • a branch path is provided in the main radiation electrode to configure a plurality of resonance circuits. It is characterized by.
  • the end of the branch path may be an open end or may be capacitively coupled to a ground electrode. You can. This makes it possible to provide a multi-frequency or wide-band antenna having a plurality of resonance modes.
  • a fifth embodiment of the present invention is characterized in that the fifth embodiment is a wireless communication device equipped with the antenna according to the first embodiment or the second embodiment.
  • the ground electrode is disposed so as to sandwich the main radiation electrode, the antenna shape and the antenna occupying area on the circuit board are extremely small.
  • FIG. 1 is an explanatory view showing an antenna according to a first embodiment of the present invention.
  • FIG. 2 is an explanatory view showing an antenna according to a second embodiment of the present invention.
  • FIG. 3 is an explanatory view showing an antenna according to a third embodiment of the present invention.
  • FIG. 4 is an explanatory view showing an antenna according to a fourth embodiment of the present invention.
  • FIG. 5A is a diagram showing a plurality of resonance circuits configured on an antenna.
  • FIG. 5B is a diagram showing a plurality of resonance circuits configured on the antenna.
  • FIG. 5C is a diagram showing a plurality of resonance circuits configured on the antenna.
  • FIG. 6 is an explanatory view in which the chip antenna of the present invention is mounted on a circuit board.
  • FIG. 7 is a development view of the chip antenna of FIG. 6.
  • FIG. 8 is a view showing a mounting example different from FIG. 6;
  • FIG. 9 is a diagram in which a metal case is arranged near a chip antenna of the present invention.
  • FIG. 10 is a configuration diagram of a wireless communication device according to the present invention.
  • FIG. 11 is a diagram showing a resonance frequency versus voltage standing wave ratio characteristic.
  • FIG. 12 is a diagram showing a characteristic of a distance to a metal case versus a resonance frequency or a bandwidth.
  • FIG. 13 is a view showing a distance-gain characteristic with respect to a metal case.
  • FIG. 14A is a diagram showing a conventional antenna.
  • FIG. 14B illustrates an example of mounting on a circuit board.
  • FIG. 15A is a diagram showing another conventional antenna different from FIG. 14;
  • FIG. 16A is a diagram showing another conventional antenna different from FIG. 15;
  • FIG. 16B shows an example of mounting on a circuit board.
  • FIG. 1 shows a first embodiment of the antenna according to the present invention.
  • reference numeral 1 denotes an antenna
  • reference numeral 20 denotes a main part of a circuit board on which the antenna 1 is mounted, and almost the entire front and back surfaces of the circuit board 20 are covered with a ground conductor 21.
  • Each electrode structure of the antenna 1 is shown as a planar configuration. As shown in FIG. 1, the antenna 1 has one end of the main radiation electrode 2 connected to the feed line 22 of the circuit board 20 via the feed electrode 6, and the other end open. Ground electrodes 3, 3 are arranged along the longitudinal direction so as to sandwich the main radiation electrode 2 at a predetermined distance. In addition, on the back surface facing the main radiating electrode 2, no ground conductor (a conductor portion that is electrically connected to the ground conductor 21 of the circuit board 20) is formed, or at least a part of a portion corresponding to the main radiating electrode 2 is formed. This ground conductor has been removed. The area without the ground conductor is called the non-ground conductor area.
  • the main radiation electrode 2 has a substantial electric length of about 1Z4 wavelength.
  • a portion where the ground conductor 21 is removed in a U-shape is provided at the end of the circuit board 20, and the antenna 1 is mounted on the non-ground conductor region 20 a, and the ground electrode 3 has a plurality of ground electrodes 3. Are connected to the ground conductor 21 at a plurality of locations via the electrode 5.
  • the main radiating electrode 2 is surrounded by a ground conductor including the ground electrode 3 so as to be open at one end and is electromagnetically shielded, and the gap between the main radiating electrode 2 and the ground electrode 3 Is always set at a fixed distance determined by the electrode structure, so the magnetic stability is extremely high!
  • the main radiation electrode 2 and the ground electrode 3 are coupled in an electromagnetically stable state, and the ground conductor 21 of the circuit board 20 located farther than the ground electrode 3 and the vicinity (not shown) Electromagnetic effects can be minimized as much as possible, and the antenna is mounted on the circuit board 20 in a small size, but it is always stable without being affected by the area and mounting position of the non-ground conductor area 20a. The obtained antenna characteristics are obtained.
  • FIG. 2 shows a second embodiment of the antenna 1 according to the present invention.
  • one end of a main radiation electrode 2 is capacitively coupled to a feed electrode 6 via a gap 8, and the other end formed in a U-shape is connected via a short-circuit electrode 5. It is connected to the ground conductor 21 of the circuit board 20. The other end of the power supply electrode 6 is connected to the power supply line 22 of the circuit board 20.
  • a ground electrode 3 connected to a ground conductor 21 is provided along the high potential portion 2a of the main radiation electrode 2.
  • the back surface facing the main radiation electrode 2 has a force in which the entire surface is an ungrounded conductor region, or has a small portion corresponding to the main radiation electrode 2. At least part of the region is an ungrounded conductor region.
  • the antenna 1 is also mounted on the U-shaped non-ground conductor region 20a at the end of the circuit board 20.
  • the low potential portion 2b of the main radiating electrode 2 is regarded as a ground conductor, and the ground electrode 3 and the low potential portion 2b of the main radiating electrode 2 constitute the high potential portion 2a of the main radiating electrode 2. Is sandwiched between them. By sandwiching between the low potential portions 2b, the electrode structure can be simplified.
  • the main radiation electrode 2 is in a state of being electromagnetically shielded by being surrounded by the ground conductor including the ground electrode 3, and this shielding effect causes the ground conductor 21 and the ground conductor 21 of the circuit board 20.
  • the magnetic effect of the nearby object force can be minimized as much as possible, and a stable antenna characteristic can be always obtained without being affected by the mounting state of the antenna on the circuit board 20 despite its small size.
  • a new ground electrode 3 is provided along the outside of the low-potential portion 2b using the low-potential portion 2b of the main radiating electrode 2 as a ground conductor, and the main radiating electrode 2 is sandwiched between the ground electrodes 3, 3.
  • the structure may be used.
  • the coupling capacitance between the high-potential portion 2a of the main radiation electrode 2 and the power supply electrode 6 (that is, the gap distance and facing width of the gap 8) and the low-potential portion 2b side By adjusting the arrangement of the short-circuit electrode 5 of this embodiment, there is also a merit that the impedance matching of the antenna can be easily performed.
  • FIG. 3 shows a third embodiment of the antenna 1 according to the present invention.
  • the antenna 1 shown in FIG. 3 has an electrode structure in which an adjustment electrode 9 is provided on the antenna of FIG.
  • the adjustment electrode 9 is capacitively coupled to the main radiation electrode 2 and the power supply electrode 6 via the gap 10, and a part of the adjustment electrode 9 is connected to the ground conductor 9 of the circuit board 20.
  • an effect of connecting a reactance component to the main radiation electrode 2 in parallel can be obtained, so that the resonance frequency of the antenna can be reduced, and the antenna shape can be further reduced in size.
  • the capacitance component and the induction component can be easily changed, so that the impedance matching range can be expanded.
  • the adjustment electrode 9 may be capacitively coupled to at least one or more of the feeding electrode 6, the main radiation electrode 2, and the short-circuit electrode 5.
  • Figure 2 also shows the structure The present invention is not limited to this and can be applied to the antenna shown in FIG.
  • FIG. 4 shows a fourth embodiment of the antenna 1 according to the present invention.
  • the antenna 1 shown in FIG. 4 is different from the antenna 1 of FIG. 3 in that a branch path 11 is provided in the middle of the main radiation electrode 2, and the end of the branch path 11 is connected to the ground electrode 3 via a gap 13. Therefore, the main radiation electrode 2 or the main radiation electrode 2 and the branch path 11 form a plurality (three) of resonance circuits having current paths indicated by broken lines in FIGS. 5A to 5C. Can be configured. Further, the end of the branch path 11 may be an open end.
  • a multi-frequency antenna having a plurality of resonance modes by a plurality of resonance circuits 14-16 can be provided, and a broadband antenna 1 can be provided if the resonance frequencies of the resonance circuits 14-16 are extremely close. Can be.
  • this configuration is not limited to the antenna 1 shown in FIG. 3, but can be applied to each antenna 1 shown in FIGS. 1 and 2.
  • the 1Z4 wavelength antenna using the image current (mapping) effect of the ground conductor 21 of the circuit board 20 is used, and the main radiation electrode 2
  • the ground electrode 3 for stabilizing the coupling between the antenna and the ground conductor 21 of the circuit board 20 and nearby structures, the antenna shape can be reduced while maintaining stable antenna characteristics, and in particular, the GPS An antenna 1 having appropriate band characteristics and high radiation efficiency suitable for use in a portable electronic device or the like having a receiving function can be provided.
  • the antenna 1 having the above configuration can further reduce the size by loading a dielectric, an inductance, and a capacitance on the electrode to lower the resonance frequency.
  • FIG. 6 shows a state where the chip antenna 1 for surface mounting is mounted on the circuit board 20
  • FIG. 7 shows a state where the chip antenna 1 is expanded. , Left side, upper main side, right side.
  • the circuit board 20 was formed of a glass epoxy board and had a size of 60 x 35.0 x 0.5mm. Almost the entire surface of both sides of the circuit board 20 is covered with a Cu conductor serving as the ground conductor 21, and the feeder line 23 that supplies high-frequency power to the antenna 1 has a characteristic impedance of approximately 50 ⁇ . It consists of a microstrip line.
  • ground conductor 21 where the chip antenna 1 is mounted is removed in a U-shape on both the front and back surfaces.
  • the area of the non-ground conductor region 20a was about 10 ⁇ 5 mm.
  • the chip antenna 1 has a rectangular parallelepiped shape having a size of 8.0 ⁇ 3.0 ⁇ 1.5 mm, and is configured using a dielectric substrate 4 having a specific dielectric constant ( ⁇ r) of 20. .
  • ⁇ r dielectric constant
  • the power supply electrode 6 connected to the power supply line 23 of the circuit board 20 is disposed from the left side surface of the dielectric base material 4 to the upper main surface. Connected to one end of The gap 8 may be formed on either the side surface or the upper main surface.
  • the main radiation electrode 2 on the upper main surface is formed in a meandering shape, and is connected to the ground conductor 21 of the circuit board 20 via a plurality of short-circuit electrodes 5 on the right side surface.
  • This electrode structure is similar to that of FIG.
  • the portion where the main radiation electrode 2 is connected to the short-circuit electrode 5 is a low potential region (ie, low potential portion 2b) due to the large current flowing through the antenna, and the portion near the feed electrode 6 has a high potential. It is a region (that is, the high potential portion 2a).
  • a plurality of ground electrodes 3 are arranged in addition to the power supply electrode 6, and each of them is connected to the ground conductor 21 of the circuit board 20.
  • the main radiating electrode (high potential portion 2a) on the upper main surface is sandwiched between the plurality of ground electrodes 3 arranged on the left side and the main radiating electrode (low potential portion 2b) arranged on the right side. And is in an electromagnetically shielded state.
  • the shielding effect can be obtained even if the ground electrode 3 is intermittently arranged near the main radiation electrode 2.
  • only the soldering terminals 12 for surface mounting corresponding to the respective electrodes are arranged on the lower main surface side.
  • the path leading to the short-circuit electrode 5 of the main radiation electrode 2 is formed on the right side, and is branched into a T-shape to provide a branch path 11, and the open end thereof is formed with a gap 13 on the left side.
  • To form a plurality of resonance circuits extend the ground electrode 3 on the left side, and capacitively couple to the feed electrode 6 via the gap 10 to form the adjustment electrode 9 Electrode structure.
  • the chip antenna 1 of the above embodiment has a small shape and a dedicated mounting area on the circuit board 20. At a resonance frequency of 1575.42 MHz, the input impedance is matched to approximately 50 ⁇ without requiring an external matching element.
  • the fractional bandwidth with a voltage standing wave ratio VSWR of less than 2 is 1.0-1.5% (see the characteristic of resonant frequency vs. voltage standing wave ratio in Fig. 11), and the radiation efficiency is 70-80%. Have been obtained. Even when the chip antenna 1 is mounted as shown in FIG. 8, the same antenna characteristics as described above are obtained, and it is a component that the degree of freedom when mounting the chip antenna 1 on a circuit board is high.
  • the point where the resonance frequency shifts high in the vicinity of the metal case 24 can be dealt with by previously calculating the frequency change due to the surrounding structure and determining the electrode dimensions of the chip antenna 1.
  • the adjustment since the length of the adjustment electrode 9 and the gap between the feed electrode 6 and the main radiation electrode 2 may be adjusted, the adjustment can be performed very easily.
  • FIG. 10 shows a wireless communication device of the present invention.
  • the wireless communication device 30 includes the above-described antenna 1 of the present invention, the high-frequency circuit 31, and the signal processing unit 32, which are collectively mounted on the circuit board 20.
  • the high-frequency circuit 31 frequency-mixes, amplifies, and band-filters the radio wave received by the antenna 1, and converts the frequency into a low-frequency band. Further, the electric signal supplied from the signal processing section 32 is frequency-mixed, band-filtered, amplified, and transmitted from the antenna 1 as a radio wave. The signal processing unit 32 demodulates the electric signal sent from the high-frequency circuit 31 to obtain a signal before modulation. Further, the transmission signal is modulated and supplied to the high frequency circuit 31.
  • an electrode structure in which a ground electrode is arranged so as to sandwich a main radiation electrode is provided. Therefore, high radiation efficiency can be maintained while the antenna shape and the antenna occupied area on the circuit board are extremely small, and the antenna is not easily affected by external elements.
  • the degree of freedom on the side can be increased, and an antenna suitable for high-density mounting can be provided. Also, by using this antenna, a wireless communication device having excellent antenna characteristics can be realized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Waveguide Aerials (AREA)

Abstract

: Une antenne qui fournit une adaptation d'impédance aisée, un ajustement de fréquence aisé et une souplesse élevée de positionnement, et qui est moins affectée par des objets périphériques, montre donc une stabilité excellente. Y sont incluses une électrode de ligne d'antenne (6) reliée à une ligne d'antenne (22) d'une carte à circuit imprimé (20), une électrode principale de rayonnement (2) reliée à l'électrode de ligne d'antenne (6) et une pluralité d'électrodes mises à la masse (3) reliées à un élément mis à la masse (21) de la carte à circuit imprimé (20). L'électrode principale de rayonnement (2) est espacée d'une distance donnée des électrodes mises à la masse (3) et prise en sandwich entre celles-ci, et au moins une partie d'un composant, qui est opposée par un composant où est formée l'électrode principale de rayonnement (2), est une zone conductrice non mise à la masse. L'antenne (1) est montée de telle sorte qu'au moins une partie d'un composant de la carte à circuit imprimé (20) opposée par l'électrode principale de rayonnement (2) est une zone conductrice non mise à la masse (20a).
PCT/JP2005/001600 2004-02-18 2005-02-03 Antenne Ceased WO2005078860A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-041523 2004-02-18
JP2004041523A JP2005236534A (ja) 2004-02-18 2004-02-18 アンテナ

Publications (1)

Publication Number Publication Date
WO2005078860A1 true WO2005078860A1 (fr) 2005-08-25

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* Cited by examiner, † Cited by third party
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GB2444164A (en) * 2006-11-22 2008-05-28 Samsung Electro Mech Chip antenna with improved bandwidth and impedance matching
WO2010087043A1 (fr) * 2009-01-29 2010-08-05 株式会社村田製作所 Antenne à puce et dispositif d'antenne
JP2010206329A (ja) * 2009-02-27 2010-09-16 Tdk Corp アンテナ装置
CN102379065A (zh) * 2009-04-03 2012-03-14 三美电机株式会社 天线装置

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DE112008003650B4 (de) * 2008-01-29 2013-11-28 Murata Manufacturing Co., Ltd. Antennenkonstruktion und Verwendung einer Antennenkonstruktion in einer drahtlosen Kommunikationseinrichtung.
JP5251610B2 (ja) * 2009-03-03 2013-07-31 Ｔｄｋ株式会社 アンテナ装置及びこれに用いるアンテナ素子
CN101540433B (zh) * 2009-05-08 2013-06-12 华为终端有限公司 一种无线终端的天线设计方法及数据卡单板
JP5375719B2 (ja) * 2010-04-01 2013-12-25 Ｔｄｋ株式会社 アンテナ装置及びこれを用いた無線通信機
JP5625829B2 (ja) 2010-11-30 2014-11-19 三菱マテリアル株式会社 アンテナ装置
WO2015015863A1 (fr) 2013-07-29 2015-02-05 株式会社村田製作所 Module sans fil à antenne intégrée et procédé de fabrication de module sans fil à antenne intégrée
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US8462051B2 (en) 2009-01-29 2013-06-11 Murata Manufacturing Co., Ltd. Chip antenna and antenna apparatus
JP5263302B2 (ja) * 2009-01-29 2013-08-14 株式会社村田製作所 チップアンテナ及びアンテナ装置
CN102301526B (zh) * 2009-01-29 2014-04-02 株式会社村田制作所 片式天线及天线装置
JP2010206329A (ja) * 2009-02-27 2010-09-16 Tdk Corp アンテナ装置
US8279133B2 (en) 2009-02-27 2012-10-02 Tdk Corporation Antenna device
CN102379065A (zh) * 2009-04-03 2012-03-14 三美电机株式会社 天线装置

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