WO2011024514A1 - フレキシブル基板アンテナ及びアンテナ装置 - Google Patents
フレキシブル基板アンテナ及びアンテナ装置 Download PDFInfo
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- WO2011024514A1 WO2011024514A1 PCT/JP2010/057208 JP2010057208W WO2011024514A1 WO 2011024514 A1 WO2011024514 A1 WO 2011024514A1 JP 2010057208 W JP2010057208 W JP 2010057208W WO 2011024514 A1 WO2011024514 A1 WO 2011024514A1
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- electrode
- flexible substrate
- parasitic radiation
- radiation electrode
- antenna
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/005—Patch antenna using one or more coplanar 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
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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
- H01Q9/0407—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 flexible substrate type antenna and an antenna device including the same, and more particularly to a flexible substrate antenna and an antenna device in which a radiation electrode is formed on a flexible substrate.
- Patent Document 1 discloses an antenna in which two plate-shaped radiating conductor plates facing each other at a predetermined interval are formed on a flexible substrate.
- FIG. 1 is a perspective view of an antenna disclosed in Patent Document 1.
- FIG. 1 is a perspective view of an antenna disclosed in Patent Document 1.
- the plate-like radiating conductor plate 1 is disposed opposite to one grounding conductor plate 3 together with another plate-like radiating conductor plate 2.
- the two plate-like radiation conductor plates 1 and 2 are formed on the same flexible substrate 4, and in order to make the two plate-like radiation conductor plates 1 and 2 and the ground conductor plate 3 face each other, A solid dielectric 5 is disposed between the ground conductor plate 3 and the ground conductor plate 3 instead of the spacer.
- the plate-like radiation conductor plate 1 is fed from a feeding point 6.
- the two plate-like radiation conductor plates 1 and 2 are both connected to the ground conductor plate 3 by short-circuit conductor plates 7 and 8.
- the width and length including the distance between the plate-like radiating conductor plates 1 and 2 are adjusted so as to cause appropriate double resonance by both antennas and to have wideband characteristics.
- Patent Document 2 discloses a dielectric antenna provided with two radiation electrodes that are provided with a feeding electrode on the back surface of a dielectric substrate, capacitively feed the radiation electrode on the front surface (upper surface), and one end grounded to the ground. Yes.
- Patent Document 3 discloses a dielectric antenna including a capacitively fed radiation element and two radiation electrodes having one end grounded.
- Patent Documents 1, 2, and 3 are designed mainly for the purpose of making multiple resonances and broadening the band, and since they have parasitic electrodes, they generally tend to be large.
- the ground electrode of the circuit board is close, or when an antenna element is mounted on the ground electrode of the circuit board, the relative permittivity of the dielectric or flexible board affects the gap between the radiation electrode and the ground. As a result, the antenna gain is degraded.
- An object of the present invention is to provide a flexible substrate antenna and an antenna apparatus including the flexible substrate antenna, which eliminates the problem caused by capacitance between adjacent ground electrodes without increasing the overall size. .
- the flexible substrate antenna of the present invention is configured as follows (1) to (7).
- a conventional antenna using a dielectric block is mounted on a circuit board in a state close to the ground electrode of the circuit board, and a conventional antenna apparatus mounted on the ground electrode of the circuit board In contrast, since the radiation electrode can be moved away from the ground electrode of the substrate, the antenna gain does not deteriorate.
- the antenna can be reduced in size.
- an antenna having a lower resonance frequency can be made with the same antenna size.
- the antenna size can be reduced, and the antenna can be downsized.
- any of the capacitive power supply electrode, the first parasitic radiation electrode, and the second parasitic radiation electrode may be formed on the first surface of the flexible substrate.
- the capacitive power supply electrode, the first parasitic radiation electrode, and the second parasitic radiation electrode are patterned substantially simultaneously, the accuracy of the capacitance generated between these electrodes can be easily increased. Can do.
- a flexible substrate A first parasitic radiation electrode and a second parasitic radiation electrode formed on the flexible substrate and facing each other with a slit-like gap; A frequency adjusting electrode formed on the flexible substrate, facing the first parasitic radiation electrode and the second parasitic radiation electrode, and grounded; A capacitive power supply electrode formed on the flexible substrate and configured to supply power to the first parasitic radiation electrode opposite to the first parasitic radiation electrode; Is provided.
- a conventional antenna using a dielectric block is mounted on a circuit board in a state close to the ground electrode of the circuit board, and a conventional antenna apparatus mounted on the ground electrode of the circuit board In contrast, since the radiation electrode can be moved away from the ground electrode of the substrate, the antenna gain does not deteriorate.
- the antenna can be reduced in size.
- the frequency adjusting electrode is provided as a ground electrode at two locations, an end on the side facing the first parasitic radiation electrode and an end on the side facing the second parasitic radiation electrode. It is desirable to provide a ground terminal that conducts electricity. With this structure, since the frequency adjustment electrode becomes a current path, the resonance frequency of the antenna can be lowered due to the influence of the inductance component of the frequency adjustment electrode. Therefore, the antenna can be reduced in size.
- any of the frequency adjusting electrode, the first parasitic radiation electrode, and the second parasitic radiation electrode may be formed on the first surface of the flexible substrate.
- the capacitive power supply electrode may also be formed on the first surface of the flexible substrate in the same manner as the frequency adjustment electrode, the first parasitic radiation electrode, and the second parasitic radiation electrode.
- the capacitive feeding electrode, the frequency adjusting electrode, the first parasitic radiation electrode, and the second parasitic radiation electrode are formed with relatively high dimensional accuracy, and the first parasitic radiation electrode and the capacitive feeding electrode are formed. Variation in capacitance between the two can be suppressed.
- the capacitive feeding electrode, the first parasitic radiation electrode, and the second parasitic radiation electrode are formed on a first surface of the flexible substrate, and the frequency adjustment electrode is a second surface of the flexible substrate. Can be formed. With this structure, the capacitance generated between the first parasitic radiation electrode, the second parasitic radiation electrode, and the frequency adjustment electrode can be increased, and the effect of the frequency adjustment electrode can be easily increased.
- the antenna device of the present invention is configured as the following (8) and (9).
- (8) One of the flexible substrate antennas described above and a housing to which the flexible substrate antenna is attached are provided. With this structure, the flexible board antenna can be disposed away from the ground electrode of the circuit board, and no unnecessary capacitance is generated between the radiation electrode and the ground electrode of the flexible board antenna. Therefore, a high antenna gain can be maintained. In addition, since it is not necessary to mount an antenna on the circuit board, the entire electronic apparatus including the antenna device can be reduced in size.
- the flexible substrate antenna of the present invention can be kept away from the ground electrode of the circuit board by attaching it to the housing of the electronic device to be assembled or the carrier mounted on the circuit board, the antenna gain Does not deteriorate.
- the antenna can be reduced in size.
- FIG. 1 is a perspective view of a flexible substrate antenna 101 according to a first embodiment.
- FIG. 6 is a six-sided view of the flexible substrate antenna 101 according to the first embodiment.
- 1 is an equivalent circuit diagram of a flexible substrate antenna 101 according to a first embodiment. It is a six-face view of the flexible substrate antenna 102 according to the second embodiment. It is a perspective view of the flexible substrate antenna 103 which concerns on 3rd Embodiment. It is a six-face view of the flexible substrate antenna 103 according to the third embodiment. It is an equivalent circuit diagram of the flexible substrate antenna 103 according to the third embodiment. It is a 6th page figure of flexible substrate antenna 104 concerning a 4th embodiment.
- FIG. 3 is a six-sided view of the flexible substrate antenna 101
- FIG. 4 is an equivalent circuit diagram of the flexible substrate antenna 101.
- the rectangular plate-like flexible substrate 10 has a lower surface (a mounting surface in contact with an inner surface of a mounting destination housing), an upper surface, first and second side surfaces facing each other, and third and fourth side surfaces facing each other. I have.
- a first parasitic radiation electrode 11 is formed from the lower surface of the flexible substrate 10 to the upper surface (first surface) via the third side surface.
- a second parasitic radiation electrode 12 is formed from the lower surface of the flexible substrate 10 to the upper surface via the fourth side surface.
- the tips (open ends) of the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 are opposed to each other by slits 13 having a predetermined interval on the upper surface of the flexible substrate 10.
- a capacitive power supply electrode 14 is formed on the lower surface of the flexible substrate 10 at a position facing the first parasitic radiation electrode 11.
- the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 formed on the lower surface of the flexible substrate 10 are used as ground terminals for connection to the ground electrode at the mounting destination.
- both ends of the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 are grounded. Since a capacitance exists between the first parasitic radiation electrode 11 and the feeding circuit 20, capacitive power feeding is performed on the first parasitic radiation electrode 11.
- This structure has the following effects.
- FIG. 5 is a six-sided view of the flexible substrate antenna 102 according to the second embodiment.
- the rectangular plate-like flexible substrate 10 has a lower surface (a mounting surface in contact with an inner surface of a mounting destination housing), an upper surface, first and second side surfaces facing each other, and third and fourth side surfaces facing each other. I have.
- a first parasitic radiation electrode 21 is formed from the lower surface of the flexible substrate 10 to the upper surface via the third side surface.
- a second parasitic radiation electrode 22 is formed from the lower surface of the flexible substrate 10 to the upper surface via the fourth side surface.
- the tips (open ends) of the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 are opposed to each other by slits 23 having a predetermined interval on the upper surface of the flexible substrate 10.
- a capacitive power supply electrode 24 is formed on the upper surface of the flexible substrate 10 at a position facing the first parasitic radiation electrode 21 in a plane.
- the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 formed on the lower surface of the flexible substrate 10 are used as ground terminals for connection to the ground electrode at the mounting destination.
- the equivalent circuit diagram of the flexible substrate antenna 102 is the same as that shown in FIG.
- the operational effects are also as described in the first embodiment.
- the capacitive power supply electrode 24, the first parasitic radiation electrode 21, and the second parasitic radiation electrode 22 are patterned substantially simultaneously, high dimensional accuracy is achieved. As a result, it is possible to suppress variation in capacitance that occurs between the first parasitic radiation electrode 21 and the capacitive feeding electrode 24.
- FIG. 6 is a perspective view of the flexible substrate antenna 103 according to the third embodiment
- FIG. 7 is a hexahedral view of the flexible substrate antenna 103
- FIG. 8 is an equivalent circuit diagram of the flexible substrate antenna 103.
- the rectangular plate-like flexible substrate 10 has a lower surface (a mounting surface in contact with an inner surface of a mounting destination housing), an upper surface, first and second side surfaces facing each other, and third and fourth side surfaces facing each other. I have.
- a first parasitic radiation electrode 11 is formed from the lower surface of the flexible substrate 10 to the upper surface (first surface) via the third side surface.
- a second parasitic radiation electrode 12 is formed from the lower surface of the flexible substrate 10 to the upper surface via the fourth side surface.
- the tips (open ends) of the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 are opposed to each other by slits 13 having a predetermined interval on the upper surface of the flexible substrate 10.
- a frequency adjustment electrode 15 is formed on the lower surface (second surface) of the flexible substrate 10.
- the frequency adjusting electrode 15 faces the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 with the base material of the flexible substrate 10 interposed therebetween. Therefore, predetermined capacitances are generated between the first parasitic radiation electrode 11 and the frequency adjustment electrode 15 and between the second parasitic radiation electrode 12 and the frequency adjustment electrode 15, respectively.
- ground terminals 16 and 17 are led out to be connected to the ground electrode at the mounting destination.
- a capacitive power supply electrode 14 is formed on the lower surface of the flexible substrate 10 at a position facing the first parasitic radiation electrode 11.
- the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 formed on the lower surface of the flexible substrate 10 are used as ground terminals for connection to a mounting destination ground electrode.
- both ends of the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 are grounded. Since a capacitance exists between the first parasitic radiation electrode 11 and the feeding circuit 20, capacitive power feeding is performed on the first parasitic radiation electrode 11.
- the frequency adjusting electrode 15 connected to the ground electrode is close to the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12.
- the capacitance between the first parasitic radiation electrode 11 and the frequency adjustment electrode 15 and the capacitance between the second parasitic radiation electrode 12 and the frequency adjustment electrode 15 are set.
- Capacitances are generated between the first parasitic radiation electrode 11 and the frequency adjustment electrode 15 and between the second parasitic radiation electrode 12 and the frequency adjustment electrode 15, respectively. 12 flows into the frequency adjustment electrode 15 through the ground, and the frequency adjustment electrode 15 becomes a current path. Therefore, an inductance component of the frequency adjustment electrode 15 is added, and the resonance frequency of the antenna can be lowered. Therefore, the antenna can be reduced in size.
- the capacitance generated between the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12 and the ground electrode of the mounting destination varies.
- the resonance frequency of the antenna can be set without changing the capacitance generated between the radiation electrode 11 and the second parasitic radiation electrode 12 and the ground electrode of the mounting destination.
- the frequency adjustment electrode 15 having a relatively small area is used.
- a predetermined capacitance can be generated between the first parasitic radiation electrode 11 and the frequency adjustment electrode 15 and between the second parasitic radiation electrode 12 and the frequency adjustment electrode 15.
- FIG. 9 is a six-sided view of the flexible substrate antenna 104 according to the fourth embodiment.
- the rectangular plate-like flexible substrate 10 has a lower surface (a mounting surface in contact with an inner surface of a mounting destination housing), an upper surface, first and second side surfaces facing each other, and third and fourth side surfaces facing each other. I have.
- a first parasitic radiation electrode 21 is formed from the lower surface of the flexible substrate 10 to the upper surface via the third side surface.
- a second parasitic radiation electrode 22 is formed from the lower surface of the flexible substrate 10 to the upper surface via the fourth side surface.
- the tips (open ends) of the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 are opposed to each other by slits 23 having a predetermined interval on the upper surface of the flexible substrate 10.
- a frequency adjustment electrode 25 is formed on the upper surface of the flexible substrate 10.
- the frequency adjustment electrode 25 faces the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 in a plane. Therefore, a predetermined capacitance is generated between the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 and the frequency adjustment electrode 25.
- ground terminals 26 and 27 that are connected to the mounting ground electrode are drawn out.
- a capacitive power supply electrode 24 is formed on the lower surface of the flexible substrate 10 at a position facing the first parasitic radiation electrode 21.
- the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 formed on the lower surface of the flexible substrate 10 are used as ground terminals for connecting to the mounting ground electrode.
- the equivalent circuit diagram of the flexible substrate antenna 104 is the same as that shown in FIG.
- the operational effects are also as described in the third embodiment.
- the frequency adjustment electrode 25, the first parasitic radiation electrode 21, and the second parasitic radiation electrode 22 are patterned at substantially the same time, so that high dimensional accuracy is achieved.
- the accuracy of the capacitance generated between the first parasitic radiation electrode 21 and the second parasitic radiation electrode 22 and the frequency adjustment electrode 25 can be easily increased.
- FIG. 10 is a hexahedral view of the flexible substrate antenna 105 according to the fifth embodiment.
- the rectangular plate-like flexible substrate 10 has a lower surface (a mounting surface in contact with an inner surface of a mounting destination housing), an upper surface, first and second side surfaces facing each other, and third and fourth side surfaces facing each other. I have.
- a first parasitic radiation electrode 31 is formed from the lower surface of the flexible substrate 10 to the upper surface via the third side surface.
- a second parasitic radiation electrode 32 is formed from the lower surface of the flexible substrate 10 to the upper surface via the fourth side surface.
- the tips (open ends) of the first parasitic radiation electrode 31 and the second parasitic radiation electrode 32 are opposed to each other by slits 33 having a predetermined interval on the upper surface of the flexible substrate 10.
- a frequency adjustment electrode 35 is formed on the upper surface of the flexible substrate 10.
- the frequency adjustment electrode 35 faces the first parasitic radiation electrode 31 and the second parasitic radiation electrode 32 in a plane. Therefore, a predetermined capacitance is generated between the first parasitic radiation electrode 31 and the second parasitic radiation electrode 32 and the frequency adjustment electrode 35.
- ground terminals 36 and 37 that are connected to the ground electrode at the mounting destination are drawn out.
- a capacitive power supply electrode 34 is formed on the upper surface of the flexible substrate 10 at a position facing the first parasitic radiation electrode 31 in a plane.
- the first parasitic radiation electrode 31 and the second parasitic radiation electrode 32 formed on the lower surface of the flexible substrate 10 are used as ground terminals for connection to the ground electrode at the mounting destination.
- the equivalent circuit diagram of the flexible substrate antenna 105 is the same as that shown in FIG.
- the operational effects are also as described in the third embodiment.
- the capacitive power supply electrode 34, the frequency adjustment electrode 35, the first parasitic radiation electrode 31, and the second parasitic radiation electrode 32 are patterned substantially simultaneously. High dimensional accuracy can be obtained, and variation in capacitance that occurs between the first parasitic radiation electrode 31 and the capacitive feeding electrode 34 can also be suppressed.
- FIG. 11 is a six-sided view of the flexible substrate antenna 106 according to the sixth embodiment.
- the rectangular plate-like flexible substrate 10 has a lower surface (a mounting surface in contact with an inner surface of a mounting destination housing), an upper surface, first and second side surfaces facing each other, and third and fourth side surfaces facing each other. I have.
- a first parasitic radiation electrode 41 is formed from the lower surface of the flexible substrate 10 to the upper surface via the third side surface.
- a second parasitic radiation electrode 42 is formed from the lower surface of the flexible substrate 10 to the upper surface via the fourth side surface.
- the tips (open ends) of the first parasitic radiation electrode 41 and the second parasitic radiation electrode 42 are opposed to each other by slits 43 having a predetermined interval on the upper surface of the flexible substrate 10.
- a frequency adjustment electrode 45 is formed on the lower surface of the flexible substrate 10.
- the frequency adjusting electrode 45 faces the first parasitic radiation electrode 41 and the second parasitic radiation electrode 42 with the base material of the flexible substrate 10 interposed therebetween. Therefore, a predetermined capacitance is generated between the first parasitic radiation electrode 41 and the second parasitic radiation electrode 42 and the frequency adjustment electrode 45.
- ground terminals 46 and 47 that are connected to the mounting ground electrode are drawn out.
- a capacitive power supply electrode 44 is formed on the upper surface of the flexible substrate 10 at a position facing the first parasitic radiation electrode 41 in a plane.
- the first parasitic radiation electrode 41 and the second parasitic radiation electrode 42 formed on the lower surface of the flexible substrate 10 are used as ground terminals for connection to a mounting destination ground electrode.
- the equivalent circuit diagram of the flexible substrate antenna 106 is the same as that shown in FIG.
- the operational effects are also as described in the third embodiment.
- a U-shaped frequency adjustment electrode is formed, but the frequency adjustment electrode may be rectangular.
- the ground terminals that are electrically connected to the ground electrode are provided at two locations, that is, an end portion on the side facing the first parasitic radiation electrode and an end portion on the side facing the second parasitic radiation electrode. This is because the frequency adjusting electrode serves as the above-described current path.
- FIG. 12 is an equivalent circuit diagram of the flexible substrate antenna 107 according to the seventh embodiment. What is different from the equivalent circuit shown in FIG. 8 in the third embodiment is a circuit at the ground terminal of the frequency adjustment electrode 15. That is, the first ground terminal 16 of the frequency adjustment electrode 15 is directly grounded, and the impedance element 51 is inserted into the second ground end 17 of the frequency adjustment electrode 15.
- an impedance element is inserted into a current path (frequency adjusting electrode 15) that flows capacitively coupled to the first parasitic radiation electrode 11 and the second parasitic radiation electrode 12.
- the resonance frequency of the antenna can also be controlled by reactance of the impedance element. For example, if the impedance element 51 is an inductor, the resonance frequency of the antenna decreases as the inductance component increases.
- FIG. 13 is a cross-sectional view of an antenna device 208 according to the eighth embodiment.
- the flexible substrate antenna 101 is affixed to the inner surface of the housing 200 of the electronic device that is the assembly destination.
- the flexible board antenna 101 is connected to the end of the circuit board 90.
- the power feeding circuit 20 is configured on the circuit board 90.
- the flexible board antenna 101 is connected to the end of the circuit board 90, the circuit board 90 is disposed along the plane part of the housing 200, and the flexible board antenna 101 is attached along the curved surface of the housing 200. .
- the flexible substrate antenna 101 can be disposed away from the ground electrode formed on the circuit substrate 90, a decrease in antenna gain can be suppressed.
- FIG. 14 is a cross-sectional view of an antenna device 209 according to the ninth embodiment.
- the flexible board antenna 101 is attached to a carrier (base) 91 mounted on a circuit board.
- the power feeding circuit 20 is configured on the circuit board 90.
- the flexible substrate antenna 101 can be disposed away from the ground electrode formed on the circuit substrate 90, a decrease in antenna gain can be suppressed.
- the flexible substrate antenna 101 shown in the first embodiment is provided as the flexible substrate antenna, but the flexible substrate antennas 102 to 102 shown in the second to seventh embodiments are provided. Any one of 107 may be provided.
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Abstract
Description
前記フレキシブル基板に形成され、スリット状の間隙で対向する第1の無給電放射電極及び第2の無給電放射電極と、
前記フレキシブル基板に形成され、前記第1の無給電放射電極に対向して前記第1の無給電放射電極に対して容量給電する容量給電電極と、
を備える。
前記フレキシブル基板に形成され、スリット状の間隙で対向する第1の無給電放射電極及び第2の無給電放射電極と、
前記フレキシブル基板に形成され、前記第1の無給電放射電極及び第2の無給電放射電極に対向し、接地される周波数調整電極と、
前記フレキシブル基板に形成され、前記第1の無給電放射電極に対向して前記第1の無給電放射電極に対して容量給電する容量給電電極と、
を備える。
(8)前述のいずれかのフレキシブル基板アンテナと、そのフレキシブル基板アンテナが貼付された筐体と、を備える。
この構造により、フレキシブル基板アンテナは回路基板のグランド電極から遠ざけて配置することができ、フレキシブル基板アンテナの放射電極とグランド電極との間に不要な容量が生じない。そのため、高いアンテナ利得が維持できる。
また、回路基板上にアンテナを実装する必要がないので、アンテナ装置を備える電子機器全体の小型化が図れる。
この構造により、フレキシブル基板アンテナは回路基板のグランド電極から遠ざけて配置することができ、フレキシブル基板アンテナの放射電極とグランド電極との間に不要な容量が生じない。そのため、高いアンテナ利得が維持できる。
図2は第1の実施形態に係るフレキシブル基板アンテナ101の斜視図、図3は前記フレキシブル基板アンテナ101の六面図、図4は前記フレキシブル基板アンテナ101の等価回路図である。
図5は第2の実施形態に係るフレキシブル基板アンテナ102の六面図である。
図6は第3の実施形態に係るフレキシブル基板アンテナ103の斜視図、図7は前記フレキシブル基板アンテナ103の六面図、図8は前記フレキシブル基板アンテナ103の等価回路図である。
前記周波数調整電極15の両端には実装先のグランド電極に導通するグランド端子16,17が引き出されている。
フレキシブル基板10の下面に形成されている第1の無給電放射電極11及び第2の無給電放射電極12は、実装先のグランド電極に接続するためのグランド端子として用いられる。
第1の無給電放射電極11と第2の無給電放射電極12との開放端同士を近接させることで、第1の無給電放射電極11と第2の無給電放射電極12との間で容量が生じて、アンテナの共振周波数を下げることができる。また、接地された周波数調整電極15と第1の無給電放射電極11との間、及び第2の無給電放射電極12との間でそれぞれ容量が生じるので、アンテナの共振周波数を下げることができる。したがってアンテナが小型化できる。
図9は第4の実施形態に係るフレキシブル基板アンテナ104の六面図である。
矩形板状のフレキシブル基板10は、下面(実装先の筐体などの内面に接する実装面)、上面、互いに対向する第1側面・第2側面、及び互いに対向する第3側面・第4側面を備えている。
前記周波数調整電極25の両端には実装先のグランド電極に導通するグランド端子26,27が引き出されている。
フレキシブル基板10の下面に形成されている第1の無給電放射電極21及び第2の無給電放射電極22は実装先のグランド電極に接続するためのグランド端子として用いられる。
なお、図9に示した構造によれば、周波数調整電極25、第1の無給電放射電極21、及び第2の無給電放射電極22は実質的に同時にパターン化されるので、高い寸法精度が得られ、第1の無給電放射電極21及び第2の無給電放射電極22と周波数調整電極25との間に生じる容量の精度を容易に高めることができる。
図10は第5の実施形態に係るフレキシブル基板アンテナ105の六面図である。
矩形板状のフレキシブル基板10は、下面(実装先の筐体などの内面に接する実装面)、上面、互いに対向する第1側面・第2側面、及び互いに対向する第3側面・第4側面を備えている。
前記周波数調整電極35の両端には実装先のグランド電極に導通するグランド端子36,37が引き出されている。
フレキシブル基板10の下面に形成されている第1の無給電放射電極31及び第2の無給電放射電極32は実装先のグランド電極に接続するためのグランド端子として用いられる。
なお、図10に示した構造によれば、容量給電電極34、周波数調整電極35、第1の無給電放射電極31、及び第2の無給電放射電極32は実質的に同時にパターン化されるので、高い寸法精度が得られ、第1の無給電放射電極31と容量給電電極34との間に生じる容量のばらつきをも抑えることができる。
図11は第6の実施形態に係るフレキシブル基板アンテナ106の六面図である。
矩形板状のフレキシブル基板10は、下面(実装先の筐体などの内面に接する実装面)、上面、互いに対向する第1側面・第2側面、及び互いに対向する第3側面・第4側面を備えている。
前記周波数調整電極45の両端には実装先のグランド電極に導通するグランド端子46,47が引き出されている。
フレキシブル基板10の下面に形成されている第1の無給電放射電極41及び第2の無給電放射電極42は実装先のグランド電極に接続するためのグランド端子として用いられる。
なお、第3~第6の実施形態では、コ字状の周波数調整電極を形成した例を示したが、周波数調整電極は矩形状であってもよい。但し、グランド電極に導通するグランド端子は第1の無給電放射電極に対向する側の端部と、第2の無給電放射電極に対向する側の端部との二箇所に設けることが望ましい。周波数調整電極が前述した電流経路となるからである。
図12は第7の実施形態に係るフレキシブル基板アンテナ107の等価回路図である。第3の実施形態で図8に示した等価回路と異なるのは、周波数調整電極15の接地端の回路である。すなわち、周波数調整電極15の第1のグランド端子16は直接接地し、周波数調整電極15の第2の接地端17にはインピーダンス素子51を挿入している。
図13は第8の実施形態に係るアンテナ装置208の断面図である。フレキシブル基板アンテナ101は組み込み先である電子機器の筐体200の内面に貼付されている。また、この例では、回路基板90の端部にフレキシブル基板アンテナ101が接続されている。給電回路20は回路基板90上に構成されている。
図14は第9の実施形態に係るアンテナ装置209の断面図である。フレキシブル基板アンテナ101は回路基板に実装されたキャリア(土台)91に貼付されている。給電回路20は回路基板90上に構成されている。
11,21,31,41…第1の無給電放射電極
12,22,32,42…第2の無給電放射電極
13,23,33,43…スリット
14,24,34,44…容量給電電極
15,25,35,45…周波数調整電極
16,17…グランド端子
26,27…グランド端子
36,37…グランド端子
46,47…グランド端子
20…給電回路
51…インピーダンス素子
90…回路基板
91…キャリア
101~107…フレキシブル基板アンテナ
200…筐体
208,209…アンテナ装置
Claims (9)
- フレキシブル基板と、
前記フレキシブル基板に形成され、スリット状の間隙で対向する第1の無給電放射電極及び第2の無給電放射電極と、
前記フレキシブル基板に形成され、前記第1の無給電放射電極に対向して前記第1の無給電放射電極に対して容量給電する容量給電電極と、
を備えたフレキシブル基板アンテナ。 - 前記容量給電電極、前記第1の無給電放射電極、及び前記第2の無給電放射電極は前記フレキシブル基板の第1面に形成された、請求項1に記載のフレキシブル基板アンテナ。
- フレキシブル基板と、
前記フレキシブル基板に形成され、スリット状の間隙で対向する第1の無給電放射電極及び第2の無給電放射電極と、
前記フレキシブル基板に形成され、前記第1の無給電放射電極及び第2の無給電放射電極に対向し、接地される周波数調整電極と、
前記フレキシブル基板に形成され、前記第1の無給電放射電極に対向して前記第1の無給電放射電極に対して容量給電する容量給電電極と、
を備えたフレキシブル基板アンテナ。 - 前記周波数調整電極は、前記第1の無給電放射電極に対向する側の端部と、前記第2の無給電放射電極に対向する側の端部との二箇所に、グランド電極に導通するグランド端子が設けられた、請求項3に記載のフレキシブル基板アンテナ。
- 前記周波数調整電極、前記第1の無給電放射電極、及び前記第2の無給電放射電極は前記フレキシブル基板の第1面に形成された、請求項3又は4に記載のフレキシブル基板アンテナ。
- 前記容量給電電極が前記フレキシブル基板の第1面に形成された、請求項5に記載のフレキシブル基板アンテナ。
- 前記容量給電電極、前記第1の無給電放射電極、及び前記第2の無給電放射電極は前記フレキシブル基板の第1面に形成され、前記周波数調整電極は前記フレキシブル基板の第2面に形成された、請求項3又は4に記載のフレキシブル基板アンテナ。
- 請求項1~7のいずれかに記載のフレキシブル基板アンテナと、前記フレキシブル基板アンテナが貼付された筐体と、を備えるアンテナ装置。
- 請求項1~7のいずれかに記載のフレキシブル基板アンテナと、前記フレキシブル基板アンテナが貼付され回路基板に搭載されたキャリアと、を備えるアンテナ装置。
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GB1203342.9A GB2486362B (en) | 2009-08-27 | 2010-04-23 | Flexible substrate antenna and antenna device |
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JP2011528680A JP5403059B2 (ja) | 2009-08-27 | 2010-04-23 | フレキシブル基板アンテナ及びアンテナ装置 |
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WO2013000069A1 (en) * | 2011-06-30 | 2013-01-03 | Sierra Wireless, Inc. | Compact antenna system having folded dipole and/or monopole |
CN102769170A (zh) * | 2012-07-24 | 2012-11-07 | 上海安费诺永亿通讯电子有限公司 | 一种宽带低sar无线终端天线*** |
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KR101637124B1 (ko) * | 2015-04-27 | 2016-07-06 | 한양대학교 산학협력단 | 표면 지향 방사 패턴을 가지는 평면 안테나 |
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JP5403059B2 (ja) | 2014-01-29 |
US9608319B2 (en) | 2017-03-28 |
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