Source: http://www.google.com.hk/patents/US8130159?hl=zh-TW
Timestamp: 2013-05-26 09:35:15
Document Index: 743906298

Matched Legal Cases: ['Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 98', 'Application No. 98', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99']

�M�Q US8130159 - Electromagnetic field generation antenna for a transponder - Google �M�Q�j�M �Ϥ� �a�� Play YouTube �s�D Gmail ���ݵw�� ��h »�i���M�Q�j�M | �������� | �n�J�i���M�Q�j�M�M�QAn antenna generating an electromagnetic field for an electromagnetic transponder and a terminal provided with such an antenna. The antenna comprises a first inductive element designed to be connected to two terminals employing an energizing voltage, and a parallel resonant circuit coupled with the first...http://www.google.com.hk/patents/US8130159?utm_source=gb-gplus-share�M�Q US8130159 - Electromagnetic field generation antenna for a transponder���}��US8130159 B2�X���������v�ӽЮѽs��12/560,184�o�G���2012�~3��6���ӽФ��2009�~9��15�� �u���v���2000�~8��17����L���}�M�Q��US20030169169US20100039337�o��HMichel BardouilletLuc Wuidart��M�Q�v�HStmicroelectronics S.A. ���M�Q������343/749343/867340/572.1343/742343/745343/866��ڱM�Q������H01Q9/00G06K7/00G06K7/08G06K7/10 �X�@����G06K7/10346G06K7/10178G06K7/10336G06K7/0008 �ڬw������G06K7/00EG06K7/10A8EG06K7/10A3CG06K7/10A8C�ѦҤ��m�M�Q�ޥ� (101)�D�M�Q�ޥ� (21)�~���s�����M�Q�ӼЧ� ���M�Q�ӼЧ��M�Q����T�� �ڬw�M�Q��Electromagnetic field generation antenna for a transponderUS 8130159 B2�K�n An antenna generating an electromagnetic field for an electromagnetic transponder and a terminal provided with such an antenna. The antenna comprises a first inductive element designed to be connected to two terminals employing an energizing voltage, and a parallel resonant circuit coupled with the first inductive element.
32. The terminal of claim 25, wherein the resonant circuit is formed of the second inductive element and of a capacitive element in parallel, and is tuned to the frequency of an excitation signal of the first inductive element. ����
CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 10/344,880, filed on Feb. 14, 2003, entitled ��ELECTROMAGNETIC FIELD GENERATION ANTENNA FOR A TRANSPONDER,�� which application is a U.S. National Stage application of International Application serial No. PCT/FR2001/02621, filed on Aug. 16, 2001, entitled ��ANTENNA GENERATING AN ELECTROMAGNETIC FIELD FOR TRANSPONDER,�� which application claims priority benefit of French patent application number 00/10699, filed on Aug. 17, 2000, entitled ��ANTENNA GENERATING AN ELECTROMAGNETIC FIELD FOR TRANSPONDER,�� which applications are hereby incorporated by reference to the maximum extent allowable by law.
According to the present invention, inductances Lp and Lb are, preferably, made in the form of planar inductances having one or several spirals. The inductances are placed in parallel planes to increase or maximize the magnetic coupling between them. This coupling is symbolized in FIG. 2 by mutual inductance M between the LR and LC circuits. Transponder 10 is a conventional transponder, the present invention requiring no modification of the transponder for its implementation. When transponder 10 is present in the terminal's field, it is in magnetic coupling (mutual inductance M��) with the rejector circuit, from which it draws the power necessary to its operation.
Zpeq=Rp+j�PXp, where Rp represents the following real part:
Rp = �s 2 �P k pb 2 �P Lp �P Lb Rb , and where Xp represents the following imaginary part:
Xp=�s�PLp, with kpb representing the magnetic coupling coefficient between the excitation and rejector circuits, and Rb representing the equivalent resistance of circuit 21 (sum of the parasitic resistances of capacitor Cb and of inductance Lb). In real part Rp, no account has been taken of resistance R1, which corresponds in practice to the output resistance of the excitation generator. The series resistance of inductance Lp has further been neglected. The taking into account of these resistive elements merely amounts to adding their respective values to resistance Rb indicated hereabove.
Further, imaginary part Xp of impedance Zpeq is a function of inductance Lp, which is reduced or minimized. Accordingly, the impedance may, as a first approximation, be considered as being purely resistive. It is thus particularly easy to obtain an off-load impedance matching (for example, at 50�[). An advantage then is that the antenna of the read/write terminal can be easily moved aside from its control circuits. A 50-�[ matched impedance cable is sufficient. Of course, when a transponder is present in the field, it has an influence upon the impedance seen by the generator (at the denominator of the real part).
FIG. 4 illustrates that the implementation of the present invention greatly eases an operation in extreme closeness of a read and/or write terminal. For this purpose, a switch 46 is provided in rejector circuit 21��. This switch is placed in parallel with inductance Lb and is intended for short-circuiting the rejector circuit and, accordingly, eliminating the coupling with excitation circuit LR. Switch 46 is controlled by circuit 2, via a connection 47.
The embodiment of FIG. 4 shows a current transformer 22�� in series with inductive element Lp, and measurement signal 23�� of which is sent to circuit 2. This current transformer provides a measurement of the current in the excitation circuit. Such an arrangement is here necessary at least for the operation in extreme closeness since a detection can no longer be performed by the rejector circuit. It is however possible to maintain the use of a measurement system, on the rejector circuit side, when the terminal operates in remote range.
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