WO2016059665A1 - バーアンテナ及び電波受信装置 - Google Patents
バーアンテナ及び電波受信装置 Download PDFInfo
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- WO2016059665A1 WO2016059665A1 PCT/JP2014/077289 JP2014077289W WO2016059665A1 WO 2016059665 A1 WO2016059665 A1 WO 2016059665A1 JP 2014077289 W JP2014077289 W JP 2014077289W WO 2016059665 A1 WO2016059665 A1 WO 2016059665A1
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- WIPO (PCT)
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- coil
- ferrite
- bar antenna
- frequency
- radio wave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
Definitions
- the present invention relates to a bar antenna and a radio wave receiver.
- Bar antennas are widely used in automobiles, radios, radio timepieces, etc., and are configured by winding a metal wire around a core material having high permeability.
- the bar antenna can receive a radio wave having a frequency corresponding to the resonance frequency by connecting a capacitor to a metal wire wound around a core material to form an LC resonance circuit.
- a technique for receiving a plurality of radio waves having different frequencies using a bar antenna has been developed, such as a technique using a variable capacitor whose capacity can be varied, and a technique for switching a plurality of capacitors having different capacities with a switch (for example, (See Patent Document 1).
- the above-described technology can selectively receive radio waves having a plurality of frequencies, but cannot simultaneously receive a plurality of radio waves having different frequencies.
- the present invention has been made in view of such problems, and an object of the present invention is to provide a bar antenna and a radio wave receiver that can more efficiently receive a plurality of radio waves having different frequencies.
- a bar antenna includes a bar-shaped ferrite, a first coil wound around the ferrite, and a second coil wound around the ferrite, wherein the first coil has a first frequency.
- the first capacitor is configured to be electrically connectable to receive the second radio wave, and the second coil can be electrically connected to the second capacitor to receive the second frequency radio wave different from the first frequency. And is configured to be connectable to an electronic circuit that detects both the radio wave received by the first coil and the radio wave received by the second coil.
- the bar antenna 100 includes a bar-shaped ferrite 110, a protective sheet 120 wound around the outer periphery of the ferrite 110, a first coil 131, a second coil 141, and a third coil 151. Is done.
- the radio wave receiving apparatus 1000 includes the bar antenna 100, the first capacitor 310, the second capacitor 320, and the radio wave detection processing unit 200.
- the magnetic field lines H penetrate through the ferrite 110 in order to represent the state when the bar antenna 100 according to the present embodiment receives radio waves. Has been.
- the first coil 131, the second coil 141, and the third coil 151 are obtained by winding an electric wire such as an enameled wire whose surface is covered with an insulating film. It is wound.
- the protective sheet 120 is preferably composed of, for example, an insulating resin film.
- the covering of the first coil 131, the second coil 141, and the third coil 151 wound around the ferrite 110 is protected, and the durability of the bar antenna is improved. Can be improved.
- first coil end portions 132A and 132B are formed at both ends of the first coil 131, respectively.
- a first capacitor 310 can be electrically connected to the first coil ends 132A and 132B.
- the LC resonance circuit is formed by the first coil 131 and the first capacitor 310 by connecting the first capacitor 310 to the first coil ends 132A and 132B.
- the resonance frequency of the LC resonance circuit is 1 / 2 ⁇ (L1 ⁇ C1) hertz.
- the bar antenna 100 functions to receive a radio wave having a first frequency corresponding to the resonance frequency.
- two second coil end portions 142A and 142B are formed at both ends of the second coil 141, and the second capacitor 320 is electrically connected to the second coil end portions 142A and 142B. Can do.
- the LC resonance circuit is formed by the second coil 141 and the second capacitor 320 by connecting the second capacitor 320 to the second coil ends 142A and 142B.
- the resonance frequency of the LC resonance circuit is 1 / 2 ⁇ (L2 ⁇ C2) hertz.
- the bar antenna 100 functions to receive a radio wave having a second frequency corresponding to the resonance frequency.
- the bar antenna 100 has a structure in which the first coil 131 and the second coil 141 are wound around the ferrite 110, so that the first coil 131 and the second coil 141 receive the first coil 131 and the second coil 141, respectively. Both radio waves of the first frequency and radio waves of the second frequency can be received. As a result, a plurality of radio waves having different frequencies can be received more efficiently.
- the bar antenna 100 according to the present embodiment can receive radio waves having the frequencies of the first frequency and the second frequency, but can also receive radio waves of frequencies near the first and second frequencies. Can do. For this reason, the bar antenna 100 according to the present embodiment can also receive a radio wave having a frequency between the first frequency and the second frequency. Therefore, the bar antenna 100 according to the present embodiment can be used as a broadband antenna.
- the first capacitor 310 and the second capacitor 320 are connected to the bar antenna 100 so that the first frequency is several tens of kilohertz (for example, 10 kilohertz) and the second frequency is several hundred kilohertz (for example, 100 kilohertz).
- the first frequency is several tens of kilohertz (for example, 10 kilohertz) and the second frequency is several hundred kilohertz (for example, 100 kilohertz).
- the bar antenna 100 has two third coil end portions 152A and 152B formed at both ends of the third coil 151, and the third coil end portions 152A and 152B include a radio wave detection processing unit. (Electronic circuit) 200 can be electrically connected.
- the radio wave detection processing unit 200 is an electronic circuit that processes the signals of the radio waves received by the first coil 131 and the second coil 141 by performing amplification, shaping (noise removal), detection, and digitization, for example. It is an electronic circuit used in various radio wave receivers such as radios, radio clocks, and radio wave detectors.
- the third coil 151 can be used as a pickup coil, and the radio waves received by the first coil 131 and the second coil 141 can be both efficiently detected with optimum impedance. .
- the radio waves received by the first coil 131 and the second coil 141 include radio waves of various frequencies including the first frequency to the second frequency.
- a separation circuit that analyzes the frequency component of the synthesized wave of the radio wave and separates and extracts signals (for example, a first frequency signal and a second frequency signal) for each desired frequency is also provided.
- the third coil 151 of the bar antenna 100 includes a third coil end 152A that is one end of the third coil 151, a third coil end 152B that is the other end, A tap 153 is provided to be taken out from any position between.
- the tap 153 can be a center tap 153 taken out from an intermediate position between the third coil end 152A and the third coil end 152B.
- the radio wave detection processing unit 200 can detect the signal from the third coil 151 in both the unbalanced mode and the balanced mode.
- the center tap 153 is connected to the ground and the signal is detected in the balanced mode, the voltage appearing at one of the third coil end 152A and the other 152B is in reverse phase (positive / negative reversal). It becomes possible to make it difficult to be affected.
- the first coil 131 and the second coil 141 are wound on both sides of the ferrite 110 sandwiching the third coil 151.
- the third coil 151 can detect both the radio wave received by the first coil 131 and the radio wave received by the second coil 141 with higher sensitivity.
- the bar antenna 100 receives radio waves by two coils of the first coil 131 and the second coil 141 wound around the ferrite 110, but receives radio waves by two or more coils. Also good. For example, 10 coils may be wound around the ferrite 110 so as to simultaneously receive 10 channels (10 different frequencies) of radio waves. In this case, when the third coil 151 is further wound around the ferrite 110 for pickup, the bar antenna 100 is configured such that a total of 11 coils are wound around the ferrite 110.
- the bar antenna 101 according to the second embodiment is configured such that the third coil 151 is wound around one end of the ferrite 110.
- Other configurations are the same as those of the bar antenna 100 according to the first embodiment.
- the bar antenna 102 is configured by arranging rod-shaped first, second, and third ferrite members 111, 112, and 113 so that they can be magnetically coupled on the same axis.
- the first protective sheet 121 is wound around the side surface of the first ferrite member 111, and the first coil 131 is wound around the outer periphery of the first protective sheet 121.
- the first capacitor 310 is electrically connected to the two first coil ends 132A and 132B formed at both ends of the first coil 131 so as to receive radio waves of the first frequency. can do.
- the second protective sheet 122 is wound around the side surface of the second ferrite member 112, and the second coil 141 is wound around the outer periphery of the second protective sheet 122.
- the second capacitor 320 is also electrically connected to the two second coil ends 142A and 142B formed at both ends of the second coil 141 so as to receive radio waves of the second frequency. can do.
- the third protective sheet 123 is wound around the side surface of the third ferrite member 113, and the third coil 151 is wound around the outer periphery of the third protective sheet 123.
- the radio wave detection processing unit (electronic circuit) 200 is electrically connected to the two third coil end portions 152A and 152B formed at both ends of the third coil 151 and the center tap 153 formed at the third coil 151. Can be connected.
- the bar antenna 103 includes the ferrite 110 so that at least two of the first coil 131, the second coil 141, and the third coil 151 overlap at least partly on the ferrite 110. It is comprised so that it may be wound around.
- the first coil 131, the second coil 141, and the third coil 151 are configured to be wound around the ferrite 110 so that at least a part of the first coil 131, the second coil 141, and the third coil 151 overlap. It is.
- the bar antenna 103 since the first coil 131, the second coil 141, and the third coil 151 are close to each other, the radio wave received by the first coil 131 and the second coil Both radio waves received by the coil 141 can be detected with higher sensitivity by the third coil 151, and the performance of the bar antenna 103 can be improved.
- the overall coil lengths of the first coil 131, the second coil 141, and the third coil 151 wound on the ferrite 110 are set as the bar antenna according to the first embodiment. It can be shorter than 100. For this reason, since the ferrite 110 having a shorter length than the ferrite 110 used in the first embodiment can be used, it is possible to use the strong ferrite 110 which is harder to break and can be easily manufactured, and the yield of the bar antenna 103 can be improved. Reduction can also be achieved.
- the bar antenna 104 includes a bar-shaped ferrite 110, a protective sheet 120 wound around a side surface of the ferrite 110, a first coil 131, and a third coil 151.
- the first capacitor 310 is electrically connected to the two first coil ends 132A and 132B formed at both ends of the first coil 131 so as to receive radio waves of the first frequency. Can be connected.
- the radio wave detection processing unit (electronic circuit) 200 can be electrically connected to the two third coil end portions 152A and 152B formed at both ends of the third coil 151.
- a second capacitor 320 can be electrically connected to the third coil end portions 152A and 152B so as to receive radio waves of the second frequency.
- the bar antenna 104 is configured such that the third coil 151 serves as the function of the second coil 141 shown in the first embodiment.
- the third coil 151 As a pickup coil while receiving both of the signals, it is possible to efficiently detect the first frequency radio wave and the second frequency radio wave with optimum impedance.
- the bar antenna 105 according to the sixth embodiment is different from the first embodiment in that the ferrite 115 is configured by laminating a plurality of plate-like ferrite members (ferrite plates) 114 in the plate thickness direction. .
- the surface area of the ferrite 115 can be increased, so that the value of magnetic permeability can be increased. For this reason, the number of turns of the first coil 131, the second coil 141, and the third coil 151 can be reduced.
- the radio wave reception characteristics of the bar antenna 105 can be further stabilized by realizing the ferrite member 114 using hard ferrite.
- the bar antenna 106 according to the seventh embodiment shown in FIG. 8 is configured using a ferrite 116 having a hexagonal cross section.
- the first coil 131, the second coil 141, and the third coil 151 wound around the ferrite 116 are regulated so as not to rotate around the central axis of the ferrite 116, so these coils 131 , 141, 151 are stably held around the ferrite 116. Therefore, the coils 131, 141, 151 can be prevented from being damaged, and the durability of the bar antenna 106 can be improved.
- the ferrite 116 having the form as in the present embodiment can be manufactured by, for example, machining from a cylindrical shape.
- the shape of the cross section of the ferrite 116 is not limited to a hexagonal shape, and at least the shape of the cross section is the distance from the first point on the outline of the cross section to the central axis of the ferrite 116.
- the distance from the second point different from the first point to the central axis may be formed so as to be a second distance different from the first distance.
- the shape of the cross section of the ferrite 116 may be a polygon including a triangle or a quadrangle, or may be an ellipse or a star.
- the bar antenna 107 according to the eighth embodiment shown in FIG. 9 is an example in which the third coil 151 is realized by using two coaxial cables 158 that are electrically connected.
- FIG. 9 only the portion where the third coil 151 is wound around the ferrite 110 is shown in an enlarged manner, but the portion not shown in FIG. 9 is the same as in the first to seventh embodiments.
- the coaxial cable 158 is configured by surrounding a linear inner conductor 154 with an insulator 155 formed of a resin such as polyethylene, and further forming the periphery of the insulator 155 with an aluminum foil or a braided steel wire.
- the outer conductor 156 is surrounded by a sheath 157 formed of a vinyl material, and the outer diameter of the sheath 157 is, for example, about 1 millimeter or less (for example, 0.7 millimeter).
- the two coaxial cables 158 are wound around the ferrite 110 in the same direction so that one end of the first coaxial cable 158 and one end of the second coaxial cable 158 are adjacent to each other, and the adjacent ones are adjacent to each other.
- the inner conductors 154 at the two ends are electrically connected to each other. Furthermore, the inner conductor 154 and the outer conductor 156 at each end are electrically connected.
- the center tap 153 can be formed in the third coil 151 configured using the coaxial cable 158.
- the third coil 151 efficiently detects the magnetic field component of the radio waves (electromagnetic waves) received by the first coil 131 and the second coil 141 of the bar antenna 107, and effectively detects the electric field component. Since it becomes possible to cut off, it becomes possible to effectively reduce the influence of noise mainly composed of electric field components generated from electric devices such as fluorescent lamps and motors.
- the bar antennas 100 to 107 according to the first to eighth embodiments have been described above, the first capacitor 310, the second capacitor 320, and the radio wave detection processing unit are added to the bar antennas 100 to 107 described in the present embodiment. By electrically connecting 200, it is possible to configure a radio wave receiver.
- the radio wave receiving device including the bar antennas 100 to 107, it is possible to more efficiently receive a plurality of radio waves having different frequencies.
- the first frequency radio waves received by the first coil 131 and the second coil 141 can be received together (for example, simultaneously).
- the bar antennas 100 to 107 and the radio wave receiving apparatus including them can be used as a broadband antenna.
- the bar antennas 100 to 107 and the radio wave receiving apparatus including them can be used when receiving radio waves in a wide band such as communication and sensing, and use a tuning circuit, a variable capacitor, a changeover switch, and the like. It is possible to realize a high-performance small antenna (antenna).
- the bar antennas 100 to 107 and the radio wave receiving apparatus including these according to the present embodiment are suitable for reception of long waves that are often used for special purposes. It is easy to get over obstacles like. Therefore, the bar antennas 100 to 107 according to this embodiment and the radio wave receiving apparatus including these can also be used for emergency communication receivers used in the event of a disaster, various exploration devices using radio waves, medical equipment, and the like. is there.
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Abstract
Description
==第1実施形態==
本発明の第1実施形態に係るバーアンテナ100を図1に示す。また本実施形態に係るバーアンテナ100を備えた電波受信装置1000を図2に示す。
==第2実施形態==
次に、本発明の第2実施形態に係るバーアンテナ101を図3に示す。
==第3実施形態==
本発明の第3実施形態に係るバーアンテナ102を図4に示す。
==第4実施形態==
次に、本発明の第4実施形態に係るバーアンテナ103を図5に示す。
==第5実施形態==
次に、本発明の第5実施形態に係るバーアンテナ104、及びバーアンテナ104を用いて構成される電波受信装置1001を図6に示す。
==第6実施形態==
次に、本発明の第6実施形態に係るバーアンテナ105を図7に示す。
==第7実施形態==
次に、本発明の第7実施形態に係るバーアンテナ106を図8に示す。
==第8実施形態==
次に、本発明の第8実施形態に係るバーアンテナ107を図9に示す。
110 フェライト
111 第1フェライト部材
112 第2フェライト部材
113 第3フェライト部材
114 フェライト板
115 フェライト
116 フェライト
120 保護シート
121 第1保護シート
122 第2保護シート
123 第3保護シート
130 第1電波受信部
131 第1コイル
132A 第1コイル端部
132B 第1コイル端部
140 第2電波受信部
141 第2コイル
142A 第2コイル端部
142B 第2コイル端部
150 電波検知部
151 第3コイル
152A 第3コイル端部
152B 第3コイル端部
153 センタータップ
154 内部導体
155 絶縁体
156 外部導体
157 シース
158 同軸ケーブル
200 電波検出処理部
310 第1コンデンサ
320 第2コンデンサ
1000、1001 電波受信装置
H 磁力線
Claims (6)
- 棒状のフェライトと、
前記フェライトに巻回される第1コイルと、
前記フェライトに巻回される第2コイルと、
を備え、
前記第1コイルは、第1周波数の電波を受信するべく第1コンデンサを電気的に接続可能に構成され、
前記第2コイルは、前記第1周波数とは異なる第2周波数の電波を受信するべく第2コンデンサを電気的に接続可能に構成されるとともに、前記第1コイルによって受信される電波及び前記第2コイルによって受信される電波を共に検出する電子回路に接続可能に構成される
ことを特徴とするバーアンテナ。 - 請求項1に記載のバーアンテナであって、
前記第2コイルは、前記第2コイルの一方の端子と他方の端子との間の何れかの位置から取り出されるタップが設けられている
ことを特徴とするバーアンテナ。 - 請求項1又は2に記載のバーアンテナであって、
前記第1コイル及び前記第2コイルは、前記フェライト上において少なくとも一部を重複させるように、前記フェライトに巻回される
ことを特徴とするバーアンテナ。 - 請求項1又は2に記載のバーアンテナであって、
前記フェライトは、棒状の第1、及び第2のフェライト部材を、同一軸上に磁気的に結合可能に配置して構成され、
前記第1コイルは、前記第1フェライト部材に巻回され、
前記第2コイルは、前記第2フェライト部材に巻回される
ことを特徴とするバーアンテナ。 - 請求項1~3のいずれかに記載のバーアンテナであって、
前記フェライトは、複数の板状のフェライト部材を板厚方向に積層して構成される
ことを特徴とするバーアンテナ。 - 棒状のフェライトと、
前記フェライトに巻回される第1コイルと、
前記フェライトに巻回される第2コイルと、
第1周波数の電波を受信するべく前記第1コイルに電気的に接続される第1コンデンサと、
前記第1周波数とは異なる第2周波数の電波を受信するべく前記第2コイルに電気的に接続される第2コンデンサと、
前記第2コイルに電気的に接続され、前記第1コイルによって受信される電波及び前記第2コイルによって受信される電波を共に検出する電子回路と、
を備えることを特徴とする電波受信装置。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS611378U (ja) * | 1985-04-22 | 1986-01-07 | マックス株式会社 | ビスセツタにおけるネジの分離装置 |
JP2003167080A (ja) * | 2001-12-03 | 2003-06-13 | Torigaa:Kk | 電波時計 |
JP2003249880A (ja) * | 2002-02-25 | 2003-09-05 | Tecdia Kk | 非接触rfidリーダーライター用白杖 |
JP2006101454A (ja) * | 2004-09-30 | 2006-04-13 | Casio Comput Co Ltd | アンテナ装置 |
JP2011018955A (ja) * | 2009-07-07 | 2011-01-27 | Casio Computer Co Ltd | アンテナ装置及び電波受信機器 |
-
2014
- 2014-10-14 WO PCT/JP2014/077289 patent/WO2016059665A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS611378U (ja) * | 1985-04-22 | 1986-01-07 | マックス株式会社 | ビスセツタにおけるネジの分離装置 |
JP2003167080A (ja) * | 2001-12-03 | 2003-06-13 | Torigaa:Kk | 電波時計 |
JP2003249880A (ja) * | 2002-02-25 | 2003-09-05 | Tecdia Kk | 非接触rfidリーダーライター用白杖 |
JP2006101454A (ja) * | 2004-09-30 | 2006-04-13 | Casio Comput Co Ltd | アンテナ装置 |
JP2011018955A (ja) * | 2009-07-07 | 2011-01-27 | Casio Computer Co Ltd | アンテナ装置及び電波受信機器 |
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