JP4218519B2 - 磁界アンテナ、それを用いて構成したワイヤレスシステムおよび通信システム - Google Patents
磁界アンテナ、それを用いて構成したワイヤレスシステムおよび通信システム Download PDFInfo
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- JP4218519B2 JP4218519B2 JP2003433886A JP2003433886A JP4218519B2 JP 4218519 B2 JP4218519 B2 JP 4218519B2 JP 2003433886 A JP2003433886 A JP 2003433886A JP 2003433886 A JP2003433886 A JP 2003433886A JP 4218519 B2 JP4218519 B2 JP 4218519B2
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- 239000003990 capacitor Substances 0.000 claims description 18
- 239000000696 magnetic material Substances 0.000 claims description 18
- 239000012212 insulator Substances 0.000 claims description 17
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- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000010298 pulverizing process Methods 0.000 claims 1
- 239000011162 core material Substances 0.000 description 8
- 230000006870 function Effects 0.000 description 4
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- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/08—Bending or folding of tubes or other profiled members
- B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/301—Three-dimensional joints, i.e. the joined area being substantially non-flat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/524—Joining profiled elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
- B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
- B29C66/73753—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized
- B29C66/73754—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized the to-be-joined areas of both parts to be joined being partially cured
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
- B29C66/73941—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset characterised by the materials of both parts being thermosets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
- B29K2105/243—Partially cured
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Near-Field Transmission Systems (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
まず、本発明による第1の磁界アンテナについて説明する。
図1は、本発明による第1の磁界アンテナの一実施形態を斜視図で示している。
図1において、1は本発明磁界アンテナ、2はコイル、3は絶縁物、4は金属板、および5は磁界アンテナが貼り付けられる被対象物の表面を示している。また、同図に示される矢印は金属板4の表面に平行な磁界成分を示している。
この本発明による第1の磁界アンテナは、図1に示すように、金属板4の絶縁物3側でない面に接着剤を塗布し被対象物5に貼り付けて使用する。
また、コイル2の断面形状は、図1に示す矩形に限られず円形断面などとしてももよいが、要するに、コイル2に起電力を生じさせるために、金属板4の表面に垂直の断面積成分を有することが必要である。
また、絶縁物3は、コイル2が金属板4の表面で短絡するのを防止するためのものである。
図2において、6はコンデンサ、7はメモリと書き込み、読み出しの機能を具えたICである。ここで、コンデンサ6はコイル2と共振させることによって、13.56MHzの磁界を選択受信するためのものである。
その他の部分は、図1と同じであるので同じ符号を付して示してある。
図3において、符号7で示されるICは、電源回路8、変復調回路9、制御回路10、およびメモリ11から構成されている。
コイル2とコンデンサ6からなる磁界アンテナで選択受信された信号は電源回路8に供給され、整流、平滑化されDC電圧が取り出され、変復調回路9および制御回路10にそれらの回路を駆動するための電源として供給される。変復調回路9は磁界アンテナによって受信された信号を復調して制御回路10に供給するとともに、制御回路10から受信した情報信号で搬送波を変調して磁界アンテナに供給するように構成されている。制御回路10は、メモリ11に受信された信号を書き込み、また、すでに書き込まれている情報信号を読み出して変復調回路9に供給する。
ICタグを代表とするワイヤレスシステムはよく知られているので、これ以上の説明は省略する。
本発明ワイヤレスシステムおよび通信システムは、また、本発明による第1の磁界アンテナを以下に説明する本発明による第2の磁界アンテナに置き換えても同様に実現できる。
図4は、本発明による第2の磁界アンテナの一実施形態を斜視図で示している。
図4において、12は本発明磁界アンテナ、2はコイル、3は絶縁物、4は金属板、13は磁性体、および5は磁界アンテナが貼り付けられる被対象物の表面を示している。また、同図に示される矢印は金属板4の表面に平行な磁界成分を示している。
実際には、第2の磁界アンテナの場合、コイルの下部に金属板があるので、これがインダクタンスLを見かけ上小さくし、それとの兼ね合いになる。
この特徴を活かして本発明による磁界アンテナは、物の生産現場や流通の段階、あるいは、人の出入りをチェックするシステムなど、広範囲に利用できるものである。
2 コイル
3 絶縁物
4 金属板
5 磁界アンテナが貼り付けられる被対象物の表面
6 コンデンサ
7 メモリと書き込み、読み出しの機能を具えたIC
8 電源回路
9 変復調回路
10 制御回路
11 メモリ
12 磁界アンテナ
13 磁性体
51 コイル
52 基板
53 情報記憶および読み出しの機能を具えたIC
Claims (8)
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面形状を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定され、かつ前記金属面を有する金属板の前記金属面とは反対側の面に磁性体が被着されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されていることを特徴とする磁界アンテナ。
- 請求項1記載の磁界アンテナにおいて、前記コイルは、磁性体からなるコアを有することを特徴とする磁界アンテナ。
- 請求項1または2記載の磁界アンテナにおいて、前記磁性体は、フェライト磁性体またはフェライト磁性体以外の金属磁性体であることを特徴とする磁界アンテナ。
- 請求項1または2記載の磁界アンテナにおいて、前記磁性体は、球状、扁平状および破砕状のうちのいずれかの形状にして粉体化した磁性体を熱可塑性樹脂または熱硬化性樹脂中に分散し、固体化したものであることを特徴とする磁界アンテナ。
- 請求項1記載の磁界アンテナにおいて、前記磁性体の前記金属が被着されているのとは反対側の面に接着剤を塗布し、該接着剤により磁界アンテナを被対象物に貼り付けるようにしたことを特徴とする磁界アンテナ。
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面形状を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定され、かつ前記金属面を有する金属板の前記金属面とは反対側の面に磁性体が被着されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されている磁界アンテナのコイルの両端に、ワイヤレスシステム用ICチップが装着されていることを特徴とするワイヤレスシステム。
- 請求項6記載のワイヤレスシステムにおいて、前記ICチップが有する入力容量を使用して前記コイルと共振させるために、コイルの巻線を調整して前記ワイヤレスシステムが使用する周波数に共振させるようにしたことを特徴とするワイヤレスシステム。
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面形状を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定され、かつ前記金属面を有する金属板の前記金属面とは反対側の面に磁性体が被着されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されている磁界アンテナのコイルの両端に、通信システム用送受信回路が接続されていることを特徴とする通信システム。
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| JP2003433886A JP4218519B2 (ja) | 2003-12-26 | 2003-12-26 | 磁界アンテナ、それを用いて構成したワイヤレスシステムおよび通信システム |
| EP04026015A EP1547753A1 (en) | 2003-12-26 | 2004-11-03 | Method and apparatus for molding thermosetting composite material |
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| JP2003433886A JP4218519B2 (ja) | 2003-12-26 | 2003-12-26 | 磁界アンテナ、それを用いて構成したワイヤレスシステムおよび通信システム |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007019891A (ja) * | 2005-07-07 | 2007-01-25 | Toda Kogyo Corp | 磁性体アンテナ |
| US10224632B2 (en) | 2015-02-03 | 2019-03-05 | Murata Manufacturing Co., Ltd. | Antenna device and electronic apparatus |
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| EP1547753A1 (en) | 2005-06-29 |
| JP2005192124A (ja) | 2005-07-14 |
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