JP4170337B2 - Electric field communication system - Google Patents

Electric field communication system Download PDF

Info

Publication number
JP4170337B2
JP4170337B2 JP2005366380A JP2005366380A JP4170337B2 JP 4170337 B2 JP4170337 B2 JP 4170337B2 JP 2005366380 A JP2005366380 A JP 2005366380A JP 2005366380 A JP2005366380 A JP 2005366380A JP 4170337 B2 JP4170337 B2 JP 4170337B2
Authority
JP
Japan
Prior art keywords
electric field
field communication
communication system
capacitance diode
variable capacitance
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.)
Expired - Fee Related
Application number
JP2005366380A
Other languages
Japanese (ja)
Other versions
JP2007174054A (en
Inventor
直志 美濃谷
満 品川
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2005366380A priority Critical patent/JP4170337B2/en
Publication of JP2007174054A publication Critical patent/JP2007174054A/en
Application granted granted Critical
Publication of JP4170337B2 publication Critical patent/JP4170337B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Near-Field Transmission Systems (AREA)

Description

本発明は、電界を電界伝達媒体に誘起し、この誘起した電界を検出して情報の送受信を行う通信に適用する電界通信システムに関する。   The present invention relates to an electric field communication system applied to communication in which an electric field is induced in an electric field transmission medium, and the induced electric field is detected to transmit / receive information.

携帯端末の小型化および高性能化により、生体に装着可能なウェアラブルコンピュータが注目されてきている。従来、このようなウェアラブルコンピュータ間の情報通信として、コンピュータに電界通信トランシーバを接続して装着し、この電界通信トランシーバが誘起する電界を、電界伝達媒体である生体を介して伝達させることによって、情報の送受信を行う方法が提案されている（特許文献１、２参照）。   Due to the miniaturization and high performance of portable terminals, wearable computers that can be attached to living bodies have been attracting attention. Conventionally, as information communication between such wearable computers, an electric field communication transceiver is connected and attached to a computer, and an electric field induced by the electric field communication transceiver is transmitted through a living body which is an electric field transmission medium, thereby Have been proposed (see Patent Documents 1 and 2).

また、図４に示す従来の電界通信トランシーバの構成図では送信と受信の構成のうち送信部分の構成のみを示している。この送信部分は、送信器３６から構成されており、送信器３６は電界伝達媒体となる生体３５に接して送信を行う。送信器３６は生体３５に接触するための絶縁体３７と、絶縁体３７を介して生体３５へ電界通信（送信）を行う送信電極３４と、可変リアクタンス３０と、送信回路３１と、回路グランド３２とを備えている。   Also, in the configuration diagram of the conventional electric field communication transceiver shown in FIG. 4, only the configuration of the transmission portion is shown in the transmission and reception configurations. This transmission part is composed of a transmitter 36, and the transmitter 36 performs transmission in contact with a living body 35 serving as an electric field transmission medium. The transmitter 36 is an insulator 37 for contacting the living body 35, a transmission electrode 34 that performs electric field communication (transmission) to the living body 35 via the insulator 37, a variable reactance 30, a transmission circuit 31, and a circuit ground 32. And.

このような構成において、電界通信において誘起される電界を強くするためには、送信器３６の出力に可変リアクタンス３０を挿入し、生体３５と大地グランド３９との間に生じる浮遊容量Ｃｂ３８と、および送信器回路グランド３２と大地グランド３９との間に生じる浮遊容量Ｃｇ３３と、でもって共振させることが行われている。 In such a configuration, in order to strengthen the electric field induced in the electric field communication, the variable reactance 30 is inserted into the output of the transmitter 36, and the stray capacitance Cb38 generated between the living body 35 and the earth ground 39, and Resonance is performed with the stray capacitance Cg 33 generated between the transmitter circuit ground 32 and the ground ground 39.

また、図５には図４に示した可変リアクタンス３０の構成図を示している。この図５には、可変容量ダイオード４０と、インダクタ４１と、抵抗４２、４３と、容量４４、４５と、交流信号端子４６、４７と、制御信号入力４８と、バッファ４９と、が示されている。   FIG. 5 shows a configuration diagram of the variable reactance 30 shown in FIG. FIG. 5 shows a variable capacitance diode 40, an inductor 41, resistors 42 and 43, capacitors 44 and 45, AC signal terminals 46 and 47, a control signal input 48, and a buffer 49. Yes.

こうした構成のインダクタ４１と可変容量ダイオード４０とで構成される可変リアクタンス３０では、可変容量ダイオード４０に印加するバイアス電圧（制御信号）を変化させてリアクタンス値を変化させる。そして、搬送波の周波数近傍で浮遊容量Ｃｇ、Ｃｂと共振が起きるようにインダクタンス値４１と可変容量ダイオード４０の容量値を設定している。 In the variable reactance 30 including the inductor 41 and the variable capacitance diode 40 having such a configuration, the reactance value is changed by changing the bias voltage (control signal) applied to the variable capacitance diode 40. The inductance value 41 and the capacitance value of the variable capacitance diode 40 are set so that the stray capacitances C g and C b resonate in the vicinity of the frequency of the carrier wave.

このような構成により、通信媒体である人体に十分な強度の電界を効率よく誘起し、誘起された電界を検出して通信を行う電界通信を利用すると、情報源に触れた人体に情報を送ることができる。
特開２００４−１５３７０８号公報 Ｕｎｉｔｅｄ Ｓｔａｔｅｓ Ｐａｔｅｎｔ Ａｐｐｌｉｃａｔｉｏｎ Ｐｕｂｌｉｃａｔｉｏｎ， Ｐｕｂ．Ｎｏ．：ＵＳ２００４／００９２２９６Ａ１ Ｐｕｂ．Ｄａｔｅ：Ｍａｙ １３， ２００４ With such a configuration, when electric field communication is performed that efficiently induces an electric field of sufficient strength in the human body, which is a communication medium, and detects the induced electric field, communication is sent to the human body touching the information source. be able to.
JP 2004-153708 A United States Patent Application Publication, Pub. No. : US2004 / 0092296A1 Pub. Date: May 13, 2004

しかしながら上述のような従来の技術においては、可変リアクタンスは高周波領域では容量として振る舞い、送信電極と回路グランド間の負荷（浮遊容量ＣｇとＣｂの直列）容量よりも大きいため、送信器から出力される信号の高周波成分は可変リアクタンスには印加されず、送信電極と回路グランド間に印加されてしまう。このため、電界通信に使用する周波数帯域外の信号が空間に放射されて、周囲の電子機器に影響を与える可能性があった。   However, in the conventional technology as described above, the variable reactance behaves as a capacitor in the high frequency region and is output from the transmitter because it is larger than the load (series of stray capacitances Cg and Cb) between the transmission electrode and the circuit ground. The high frequency component of the signal is not applied to the variable reactance but applied between the transmission electrode and the circuit ground. For this reason, there is a possibility that a signal outside the frequency band used for electric field communication is radiated to the space and affects surrounding electronic devices.

本発明は上記を鑑みてなされたものであり、その目的は、電界通信に不要な周波数帯の高周波成分を除去し、周囲の電子機器への影響を低減することにある。   The present invention has been made in view of the above, and an object of the present invention is to remove a high-frequency component in a frequency band unnecessary for electric field communication, and to reduce the influence on surrounding electronic devices.

上記の目的を達成するために、請求項１に記載の本発明は、送信すべき情報に基づく電界を電界伝達媒体に誘起し、この誘起した電界を用いて情報の送信を行う電界通信システムにおいて、所定の周波数を有する交流信号で前記送信すべき情報を変調し送信信号を生成して出力する送信手段と、前記送信信号を前記電界伝達媒体に送信するための電極と、前記送信信号と共振するための第１のインダクタと、印加された電圧に応じて静電容量が変化する可変容量ダイオードと、入力された前記送信信号を前記可変容量ダイオードで整流して得られた直流電流に応じて生じた電位差を前記可変容量ダイオードのアノードとカソード間に印加するための第１の抵抗器と、でもってリアクタンス値を変化可能な可変リアクタンスと、を有してなり、前記送信信号が入力される前記可変リアクタンスの入力端に直列に挿入された第２のインダクタと、前記送信信号が出力される前記可変リアクタンスの出力端と当該可変リアクタンスの回路グランドとの間に挿入された第１の容量と、を備える。 To achieve the above object, the present invention according to claim 1 is an electric field communication system in which an electric field based on information to be transmitted is induced in an electric field transmission medium and information is transmitted using the induced electric field. Transmitting means for modulating the information to be transmitted with an AC signal having a predetermined frequency to generate and output a transmission signal; an electrode for transmitting the transmission signal to the electric field transmission medium; and resonance with the transmission signal A first inductor for performing the operation, a variable capacitance diode whose capacitance changes according to an applied voltage, and a direct current obtained by rectifying the input transmission signal with the variable capacitance diode. A first resistor for applying the generated potential difference between an anode and a cathode of the variable capacitance diode, and a variable reactance capable of changing a reactance value, Inserting a second inductor whose serial transmission signal is inserted in series with the input end of the variable reactance input, between the circuit ground of the output terminal and the variable reactance of the variable reactance which the transmission signal is output First capacity.

また、請求項２に記載の本発明は、請求項１において、前記第２のインダクタに並列に接続された第２の抵抗器を備える。   According to a second aspect of the present invention, there is provided the second resistor according to the first aspect, wherein the second resistor is connected in parallel to the second inductor.

また、請求項３に記載の本発明は、請求項１又は２において、前記電界伝達媒体に誘起された受信すべき情報に基づく電界を前記電極を介して受信するための受信手段を備える。
According to a third aspect of the present invention, there is provided the receiving means for receiving an electric field based on information to be received induced in the electric field transmission medium through the electrode in the first or second aspect .

本発明によれば、電界通信に不要な周波数帯の高周波成分を除去し、周囲の電子機器への影響を低減することができる。   ADVANTAGE OF THE INVENTION According to this invention, the high frequency component of a frequency band unnecessary for electric field communication can be removed, and the influence on the surrounding electronic device can be reduced.

＜第１の実施の形態＞
図１には、電界通信システムに係る第１の実施の形態を説明するための構成図を示す。電界通信システムは、その通信において送信時に効率よく十分なレベルの送信信号を電界伝達媒体に伝えるための可変リアクタンスを備えている。この可変リアクタンスは図１に示すように、可変容量ダイオード１と、インダクタ２、３と、抵抗４、５、６と、容量７、８、９と、バッファ１０と、回路グランド１４と、から構成されている。なお、可変リアクタンスへの信号の入出力のために交流信号端子１１、１３と、制御信号入力１２とを備えている。 <First Embodiment>
FIG. 1 shows a configuration diagram for explaining a first embodiment of an electric field communication system. The electric field communication system includes a variable reactance for efficiently transmitting a sufficient level of transmission signal to the electric field transmission medium during transmission in the communication. As shown in FIG. 1, this variable reactance is composed of a variable capacitance diode 1, inductors 2 and 3, resistors 4, 5 and 6, capacitors 7, 8 and 9, a buffer 10, and a circuit ground 14. Has been. Note that AC signal terminals 11 and 13 and a control signal input 12 are provided for inputting and outputting signals to and from the variable reactance.

このような構成の電界通信システムにおいては、インダクタ２と可変容量ダイオード１で図４に示す浮遊容量Ｃｇ３３やＣｂ３８と共振する回路を構成している。抵抗４と抵抗５は搬送波が回路グランド１４やバッファ回路１０に漏れるのを防ぐ役割をしている。また、容量７と容量８は可変容量ダイオード１に印加されるバイアス電圧（制御信号）が交流信号端子１１に接続される送信回路の出力回路に漏れることや、インダクタ２で短絡されるのを防ぐ役割をしている。   In the electric field communication system having such a configuration, a circuit that resonates with the stray capacitances Cg33 and Cb38 shown in FIG. The resistors 4 and 5 serve to prevent the carrier wave from leaking to the circuit ground 14 and the buffer circuit 10. The capacitors 7 and 8 prevent the bias voltage (control signal) applied to the variable capacitance diode 1 from leaking to the output circuit of the transmission circuit connected to the AC signal terminal 11 or being short-circuited by the inductor 2. Have a role.

そして不要な高周波成分を除去するためのインダクタ３と容量９が設けられている。このインダクタ３と容量９を備えることにより、通信に使用する周波数帯よりも高い周波数領域では、容量９よりもインダクタ３のインピーダンスを高く設定することで信号が遮断され、図４に示す送信電極３４と回路グランド１４の間には印加されなくなる。これにより通信に使用する周波数帯域外の信号が空間に放射されるのを防ぐことができる。   An inductor 3 and a capacitor 9 are provided for removing unnecessary high frequency components. By providing the inductor 3 and the capacitor 9, the signal is cut off by setting the impedance of the inductor 3 higher than that of the capacitor 9 in a frequency region higher than the frequency band used for communication, and the transmission electrode 34 shown in FIG. And the circuit ground 14 are not applied. As a result, signals outside the frequency band used for communication can be prevented from being radiated to the space.

また、抵抗６はインダクタ３と容量９で起きる直列共振をダンピングするために使用している。このインダクタ３と抵抗６を並列に接続することにより、通信に使用する帯域では図４に示す浮遊容量Ｃｇ３３やＣｂ３８との直列共振に対する、抵抗６によるダンピングを防ぐことができる。さらに、インダクタ３をインダクタ２よりも１０分の１以下の大きさにすれば、通信に使用する帯域では浮遊容量Ｃｂ３３やＣｇ３８との直列共振に与える影響はほとんどない。   The resistor 6 is used for damping a series resonance that occurs in the inductor 3 and the capacitor 9. By connecting the inductor 3 and the resistor 6 in parallel, damping by the resistor 6 can be prevented with respect to the series resonance with the stray capacitances Cg33 and Cb38 shown in FIG. 4 in the band used for communication. Furthermore, if the inductor 3 is made a size of 1/10 or less than the inductor 2, there is almost no influence on the series resonance with the stray capacitances Cb33 and Cg38 in the band used for communication.

＜第２の実施の形態＞
なお、図１の構成では可変容量ダイオード１を１個だけ用いているが、等価的な耐圧を増加させるために図２に示すように可変容量ダイオード１、１５の２個を用いて直列に接続する構成でもよい。 <Second Embodiment>
In the configuration of FIG. 1, only one variable capacitance diode 1 is used, but in order to increase the equivalent breakdown voltage, two variable capacitance diodes 1 and 15 are connected in series as shown in FIG. The structure to do may be sufficient.

このような構成により、通信に使用する帯域の交流信号では各容量を短絡とみなせ可変容量ダイオード１、可変容量ダイオード１５が直列に接続された構成となり、交流信号の電圧はそれぞれの各可変容量ダイオード１と可変容量ダイオード１５に分割されて印加される。   With such a configuration, in the AC signal in the band used for communication, each capacitor can be regarded as a short circuit, and the variable capacitance diode 1 and the variable capacitance diode 15 are connected in series, and the voltage of the AC signal is set to each variable capacitance diode. 1 and the variable capacitance diode 15 are divided and applied.

従って共振状態になって交流信号の電圧が大きくなってもそれぞれの可変容量ダイオードに印加される電圧は半分になり、可変容量ダイオードが１個のときに比べ可変容量ダイオードの印加電圧の制限による共振の抑制が生じにくくなる。   Therefore, even if the voltage of the AC signal increases in the resonance state, the voltage applied to each variable capacitance diode is halved, and resonance occurs due to the limitation of the voltage applied to the variable capacitance diode as compared with a single variable capacitance diode. Is less likely to occur.

本実施の形態では可変容量ダイオードを可変容量ダイオード１と可変容量ダイオード１５の計２個で用いているが、２個以上でもかまわない。これに対し、低周波である制御信号では各容量を開放とみなせ、各可変容量ダイオード１、１５はバッファアンプ１０から見て並列に接続されている。このため制御信号入力１２に印加される制御信号の電圧は分割されることなくそのままの大きさで印加される。本実施の形態では印加電圧が可変容量ダイオードの耐電圧よりも大きくなったことによる共振の抑制を防ぎ、かつ容量の可変範囲を減少させない回路構成となっている。   In this embodiment, a total of two variable capacitance diodes, variable capacitance diode 1 and variable capacitance diode 15, are used, but two or more may be used. On the other hand, in the control signal having a low frequency, each capacitor can be regarded as open, and the variable capacitance diodes 1 and 15 are connected in parallel as viewed from the buffer amplifier 10. Therefore, the voltage of the control signal applied to the control signal input 12 is applied as it is without being divided. In this embodiment, the circuit configuration prevents the suppression of resonance due to the applied voltage becoming higher than the withstand voltage of the variable capacitance diode and does not reduce the variable range of the capacitance.

＜第３の実施の形態＞
また、可変容量ダイオードの非線形による歪みを抑制するために、図３に示すようにアノードとカソードを逆にして接続してもよい。一般に可変容量ダイオードの電流電圧特性は非対称であることから、アノードの電位が高いときには半導体の特性で決まる所定の値より大きい時は短絡になり、交流信号の振幅が抑制される。 <Third Embodiment>
Further, in order to suppress distortion due to nonlinearity of the variable capacitance diode, the anode and the cathode may be reversed and connected as shown in FIG. In general, since the current-voltage characteristics of the variable capacitance diode are asymmetric, when the anode potential is high, a short circuit occurs when the anode potential is higher than a predetermined value determined by the semiconductor characteristics, and the amplitude of the AC signal is suppressed.

これを防ぐために高周波の交流信号に対して可変容量ダイオード１、可変容量ダイオード１５、可変容量ダイオード２０、可変容量ダイオード２１を直列かつ逆方向にも接続している。この構成により一方の可変容量ダイオードが短絡となっても逆方向の可変容量ダイオードは短絡になっていないため交流信号の振幅が抑制されることはない。なお、図１および図２と同様に抵抗４、５、１６、１７を備え、さらに抵抗２３、２４、２５をも備えている。   In order to prevent this, the variable capacitance diode 1, the variable capacitance diode 15, the variable capacitance diode 20, and the variable capacitance diode 21 are connected in series and in the reverse direction to a high-frequency AC signal. With this configuration, even if one of the variable capacitance diodes is short-circuited, the reverse-direction variable capacitance diode is not short-circuited, so that the amplitude of the AC signal is not suppressed. 1 and 2, resistors 4, 5, 16, and 17 are provided, and resistors 23, 24, and 25 are also provided.

以上説明した実施の形態によれば、電界通信に不要な周波数帯の高周波成分を除去し、周囲の電子機器への影響を低減することができる。   According to the embodiment described above, it is possible to remove high frequency components in a frequency band unnecessary for electric field communication, and to reduce the influence on surrounding electronic devices.

電界通信システムの第１の実施の形態の構成図を示す。The block diagram of 1st Embodiment of an electric field communication system is shown. 電界通信システムの第２の実施の形態の構成図を示す。The block diagram of 2nd Embodiment of an electric field communication system is shown. 電界通信システムの第３の実施の形態の構成図を示す。The block diagram of 3rd Embodiment of an electric field communication system is shown. 従来の技術による電界通信システムの構成図を示す。The block diagram of the electric field communication system by a prior art is shown. 従来の技術による電界通信システムの構成図を示す。The block diagram of the electric field communication system by a prior art is shown.

符号の説明Explanation of symbols

１ 可変容量ダイオード
２、３ インダクタ
４、５、６ 抵抗
７、８、９ 容量
１０ バッファ 1 Variable capacitance diode 2, 3 Inductor 4, 5, 6 Resistance 7, 8, 9 Capacity 10 Buffer

Claims (3)

送信すべき情報に基づく電界を電界伝達媒体に誘起し、この誘起した電界を用いて情報の送信を行う電界通信システムにおいて、
所定の周波数を有する交流信号で前記送信すべき情報を変調し送信信号を生成して出力する送信手段と、
前記送信信号を前記電界伝達媒体に送信するための電極と、
前記送信信号と共振するための第１のインダクタと、印加された電圧に応じて静電容量が変化する可変容量ダイオードと、入力された前記送信信号を前記可変容量ダイオードで整流して得られた直流電流に応じて生じた電位差を前記可変容量ダイオードのアノードとカソード間に印加するための第１の抵抗器と、でもってリアクタンス値を変化可能な可変リアクタンスと、を有してなり、
前記送信信号が入力される前記可変リアクタンスの入力端に直列に挿入された第２のインダクタと、
前記送信信号が出力される前記可変リアクタンスの出力端と当該可変リアクタンスの回路グランドとの間に挿入された第１の容量と、
を備えることを特徴とする電界通信システム。 In an electric field communication system in which an electric field based on information to be transmitted is induced in an electric field transmission medium and information is transmitted using the induced electric field.
Transmitting means for modulating the information to be transmitted with an AC signal having a predetermined frequency to generate and output a transmission signal;
An electrode for transmitting the transmission signal to the electric field transmission medium;
A first inductor for resonating with the transmission signal, a variable capacitance diode whose capacitance changes in accordance with an applied voltage, and obtained by rectifying the input transmission signal with the variable capacitance diode A first resistor for applying a potential difference generated according to a direct current between an anode and a cathode of the variable capacitance diode, and a variable reactance capable of changing a reactance value.
A second inductor inserted in series at an input end of the variable reactance to which the transmission signal is input;
A first capacitor inserted between the output terminal of the variable reactance from which the transmission signal is output and the circuit ground of the variable reactance ;
An electric field communication system comprising: 前記第２のインダクタに並列に接続された第２の抵抗器を備えることを特徴とする請求項１に記載の電界通信システム。   The electric field communication system according to claim 1, further comprising a second resistor connected in parallel to the second inductor. 前記電界伝達媒体に誘起された受信すべき情報に基づく電界を前記電極を介して受信するための受信手段を備えることを特徴とする請求項１又は２に記載の電界通信システム。 Electric field communication system according to claim 1 or 2, characterized in that it comprises a receiving means for receiving an electric field based on information to be received, which is induced in the electric field transmission medium via said electrode.
JP2005366380A 2005-12-20 2005-12-20 Electric field communication system Expired - Fee Related JP4170337B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005366380A JP4170337B2 (en) 2005-12-20 2005-12-20 Electric field communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005366380A JP4170337B2 (en) 2005-12-20 2005-12-20 Electric field communication system

Publications (2)

Publication Number Publication Date
JP2007174054A JP2007174054A (en) 2007-07-05
JP4170337B2 true JP4170337B2 (en) 2008-10-22

Family

ID=38300065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005366380A Expired - Fee Related JP4170337B2 (en) 2005-12-20 2005-12-20 Electric field communication system

Country Status (1)

Country Link
JP (1) JP4170337B2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4805367B2 (en) * 2009-01-27 2011-11-02 日本電信電話株式会社 Electrode adjustment system
KR101026965B1 (en) * 2009-09-02 2011-04-11 한국과학기술원 Apparatus for a wireless communication using series resonance
US9570222B2 (en) * 2013-05-28 2017-02-14 Tdk Corporation Vector inductor having multiple mutually coupled metalization layers providing high quality factor
US9086709B2 (en) 2013-05-28 2015-07-21 Newlans, Inc. Apparatus and methods for variable capacitor arrays
US10382002B2 (en) 2015-03-27 2019-08-13 Tdk Corporation Apparatus and methods for tunable phase networks
US10042376B2 (en) 2015-03-30 2018-08-07 Tdk Corporation MOS capacitors for variable capacitor arrays and methods of forming the same
US10073482B2 (en) 2015-03-30 2018-09-11 Tdk Corporation Apparatus and methods for MOS capacitor structures for variable capacitor arrays
US9973155B2 (en) 2015-07-09 2018-05-15 Tdk Corporation Apparatus and methods for tunable power amplifiers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3759099B2 (en) * 2002-10-31 2006-03-22 日本電信電話株式会社 Transceiver
EP1819073B1 (en) * 2004-12-02 2018-03-07 Nippon Telegraph And Telephone Corporation Transmitter, field communication transceiver, and field communication system
JP4191702B2 (en) * 2005-05-09 2008-12-03 日本電信電話株式会社 Transmitter and transceiver

Also Published As

Publication number Publication date
JP2007174054A (en) 2007-07-05

Similar Documents

Publication Publication Date Title
JP4170337B2 (en) Electric field communication system
US9191004B2 (en) Signal converting device and digital transmitting apparatus applying the signal converting device
JP6283465B2 (en) Temperature compensation of acoustic resonators in the electrical domain
CN107644852B (en) Integrated passive device for RF power amplifier package
JP5828768B2 (en) Protection circuit
CN100425102C (en) Condenser microphone employing wide band stop filter and having improved resistance to electrostatic discharge
US9136915B2 (en) Wireless communication device
CN101421931B (en) Antenna device and electronic device using the same
JP4715666B2 (en) Matching device and antenna matching circuit
US9350835B2 (en) Mobile wireless communications device with improved broadband antenna impedance matching
EP2779439A1 (en) High-frequency, broadband amplifier circuit
US8639195B2 (en) High voltage swing input/output enabled in a standard IC process using passive impedance transformation
JP4460546B2 (en) Communication system, transmitter and receiver
CN103516388B (en) Mobile communication equipment
US9774310B2 (en) Common mode noise suppressing device
JP4209872B2 (en) Electric field communication system
JP4191702B2 (en) Transmitter and transceiver
JP4191727B2 (en) Electric field communication system
KR20060095286A (en) Variable inductance applying apparatus using variable capacitor and variable frequency generating apparatus thereof
KR101283059B1 (en) Antenna and impedance matching device comprising the same
TW200406967A (en) Circuit arrangement
JP2006197056A (en) High frequency amplifying circuit and radio transmitter using same
KR100538614B1 (en) Voltage control oscillator
JP5935937B1 (en) Transmission apparatus, transmission method, and transmission system
CN215010220U (en) Radio frequency circuit

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080603

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080707

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080729

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080806

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110815

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees