Source: http://www.google.com/patents/US7511621?dq=5,583,822
Timestamp: 2017-12-18 03:50:32
Document Index: 174009376

Matched Legal Cases: ['application No. 60', 'application No. 60', 'application No. 60', 'application No. 60', 'application No. 60', 'application No. 60', 'application No. 60', 'application No. 60', 'Application No. 60', 'application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', '§15']

Patent US7511621 - High-performance mobile power antennas - Google Patents
An RFID tag's mobility can be increased and cost can be decreased by using high-performance mobile power antennas instead of battery powered tags. Disclosed are some power antennas that include a half wave rectifier, a full wave rectifier, and a voltage multiplier. These antennas can be cascaded to boost...http://www.google.com/patents/US7511621?utm_source=gb-gplus-sharePatent US7511621 - High-performance mobile power antennas
Publication number US7511621 B1
Application number US 11/694,229
Publication number 11694229, 694229, US 7511621 B1, US 7511621B1, US-B1-7511621, US7511621 B1, US7511621B1
Inventors Dah-Weih Duan, Daniel J. Friedman, Harley Kent Heinrich, Ian Bardwell-Jones, Lou Ruggiero
Patent Citations (67), Non-Patent Citations (13), Referenced by (9), Classifications (23), Legal Events (4)
High-performance mobile power antennas
US 7511621 B1
1. In a radio frequency tag system for operating within a carrier frequency band above 900 megahertz containing a carrier frequency above 900 megahertz which produces an electromagnetic field, said radio frequency tag system comprising:
(a) a transmitter system for transmitting radio frequency electromagnetic energy in the carrier frequency band above 900 megahertz containing said carrier frequency above 900 megahertz so as to produce the electromagnetic field; and
(b) a radio frequency tag for receiving power from the electromagnetic field, said radio frequency tag comprising tag circuitry;
(c) said radio frequency tag comprising an antenna configuration that is substantially resonant at the carrier frequency band above 900 megahertz and is excited by the electromagnetic field to cause an induced current to be present at antenna terminals of the antenna configuration; and
(d) said antenna configuration developing sufficient power to operate said tag circuitry in the absence of transmitted electromagnetic energy for at least fifty microseconds.
2. In a radio frequency tag system according to claim 1, said antenna configuration being substantially resonant at carrier frequencies in a range of carrier frequencies between 902 megahertz and 928 megahertz.
3. In a radio frequency tag system according to claim 2, said antenna configuration supplying power to said tag circuitry via an impedance selected for substantially maximum power transfer to said tag circuitry.
4. In a radio frequency tag system according to claim 1, said antenna configuration supplying power to said tag circuitry via an impedance selected for substantially maximum power transfer to said tag circuitry.
The present application is a division of application Ser. No. 10/770,341, filed Feb. 2, 2004, now U.S. Pat. No. 7,215,248, issued May 8, 2007, which, in turn is a division of application Ser. No. 10/440,492 filed May 16, 2003, now abandoned, which claims the benefit of U.S. provisional application No. 60/385,528, filed Jun. 4, 2002, and also claims the benefit of U.S. provisional application No. 60/430,553, filed Dec. 3, 2002, and is a continuation-in-part of application Ser. No. 10/308,859, filed Dec. 3, 2002, now abandoned, which, in turn, is a continuation-in-part of application Ser. No. 10/162,418, filed Jun. 4, 2002, now abandoned, which, in turn, is a continuation of application Ser. No. 09/426,235, filed Oct. 25, 1999, now U.S. Pat. No. 6,400,274, which is a continuation of application Ser. No. 09/321,986, filed May 28, 1999, now abandoned, which claims benefit of U.S. provisional application No. 60/086,972, filed May 28, 1998. Said application Ser. No. 09/426,235 filed Oct. 25, 1999 is a continuation-in-part of application Ser. No. 09/227,768, filed Jan. 8, 1999, now U.S. Pat. No. 6,243,013 and said application Ser. No. 09/321,986 filed May 28, 1999 is a continuation-in-part of application Ser. No. 08/733,684, filed Oct. 17, 1996, now U.S. Pat. No. 5,889,489, which, in turn, is a continuation-in-part of application Ser. No. 08/521,898, filed Aug. 31, 1995, now U.S. Pat. No. 5,606,323. Said application Ser. No. 09/426,235 filed Oct. 25, 1999 is a continuation-in-part of application Ser. No. 09/114,037, filed Jul. 10, 1998, now abandoned, and is a continuation-in-part of application Ser. No. 09/195,733 filed Nov. 19, 1998, now abandoned, and is a continuation-in-part of application Ser. No. 09/211,584, filed Dec. 14, 1998, which in turn, is a continuation of application Ser. No. 08/626,820 filed Apr. 3, 1996, now U.S. Pat. No. 5,850,181. Said application Ser. No. 09/321,986 filed May 28, 1999 is a continuation-in-part of application Ser. No. 09/263,057, filed Mar. 6, 1999, now abandoned, which, in turn, claims benefit of U.S. provisional application No. 60/077,094, filed Mar. 6, 1998. Said application Ser. No. 09/321,986 is a continuation-in-part of application Ser. No. 09/266,973 filed Mar. 12, 1999, now abandoned, which, in turn, claims benefit of U.S. provisional application No. 60/077,872, filed Mar. 13, 1998.
Application Ser. No. 09/922,598 filed Dec. 29, 1998, U.S. Provisional application No. 60/070,347 filed Jan. 2, 1998, U.S. Provisional application No. 60/385,528 filed Jun. 4, 2002, U.S. Provisional application No. 60/430,553 filed Dec. 3, 2002, and U.S. Pat. Nos. 6,400,274, 6,243,013, 6,028,564, 6,097,347, 5,808,500, and 5,606,323 are each incorporated herein by reference in its entirety. All of the above patents and applications are hereby incorporated herein by reference in their entirety including incorporated material.
The field of the invention relates is the field of Radio Frequency (RF) transponders (RF Tags) which receive RF electromagnetic radiation from a base station whether or not the RF tags have a battery (which may be charged by the received RF energy), and send information to the base station by modulating the load of an RF antenna.
FIG. 4 shows cascaded antennas.
FIG. 9 shows a sketch of a system for communicating power and information between a base station and an RF tag
Three-dimensional constructions such as via holes, jumping wires, etc, are costly to manufacture. It is therefore desirable to conceive two-dimensional (planar) layouts for the cascaded antenna arrays. Several of these planar implementations are illustrated in FIGS. 5A, 5B and 5C, in which the gray-shaded boxes (51) represent IC's that contain the necessary rectifying circuits and other processing circuitry. FIG. 5A shows how to attach an array of several dipoles (52) to an IC in planar fashion. Obviously, a limiting factor on the maximum number of dipoles is the circumference of the IC. FIG. 5B illustrates a planar two-element folded-dipole antenna array (53). Although not depicted, the bent antennas can also be arrayed in a way similar to FIG. 5A or 5B depending on whether the antennas have open ends or closed ends. A mixture of open-ended and close-ended antennas may be combined in the same array. If more than two folded-dipole antennas are to be arranged two-dimensionally, one may have to use different but similar antenna sizes (54-57) as shown in FIG. 5C. Besides improved powering capability, this “embedded” topology is preferred for broadened bandwidth.
FIG. 6 shows a sketch of a circuit diagram for receiving power from two tag antennas 102 and 104. Tag antennas 102 and 104 are sketched here as dipole antennas, but they could be any one or any combination of dipole, patch, loop, or slot antennas as are known in the art. Tag antennas 102 and 104 could also be any one of the above and/or any one or any combination of DOG, HOG, or SOG antennas which are described in great detail in: U.S. application Ser. No. 09/191,641 filed Nov. 13, 1998 by Duan et al. entitled “RF Identification Transponder having a spiral antenna”, now U.S. Pat. No. 6,118,379 issued Sep. 12, 2000; U.S. application Ser. No. 09/192,063 filed Nov. 13, 1998 by Duan et al. entitled “RF Identification Transponder having a helical antenna”; U.S. application Ser. No. 09/191,642 filed Nov. 13, 1998 by Duan et al. entitled “RF Identification Transponder employing patch antenna”, now U.S. Pat. No. 6,215,402 issued Apr. 10, 2001; and U.S. application Ser. No. 09/192,052 filed Nov. 13, 1998 by Duan et al. entitled “Distributed Impedance matching circuit for high reflection coefficient load”, now U.S. Pat. No. 6,177,872 issued Jan. 23, 2001, which are hereby incorporated by reference in this application. Of particular importance to the invention are the innovative impedance matching schemes noted in the above identified applications. Tag antennas 102 and 104 are shown in FIG. 6 providing power and information to voltage doubling circuits 106 and 108 respectively. Voltage doubling circuits 106 and 108 are well known voltage doubling circuits for providing power to passive RF tags, and could be replaced with single rectification circuits or higher order cascade voltage multiplication circuits as known in the art. RF diodes 112 and 114 act together to charge capacitor 116. Elements 118, 120 and 122 perform a similar function in circuit 108. Circuits 106 and 108 charge capacitor 124 to a voltage twice the voltage available with a single RF diode; capacitor 124 may act as a power supply for tag electronics 129, or may act as a modulated signal receiver for tag electronics in the case that the tag electronics 129 have a battery power supply as in the case of an active RF Tag. Power or signals are fed into the tag electronic section over lines 126 and 128 respectively. Line 128 is shown as the conventional ground. The tag electronics may also receive modulated signals by many other means than by measuring voltage across capacitor 124. For example, signals may be recovered by measuring the voltage across capacitors 116 or 122, or receiving circuits may be added as shown in incorporated U.S. patent application Ser. No. 08/733,684, (now U.S. Pat. No. 5,889,489 issued Mar. 30, 1999) which are completely apart from the power receiving circuits 106 and 108.
The tag electronics may also receive modulated signals by many other means than by measuring voltage across capacitor 124. For example, signals may be recovered by measuring the voltage across capacitors 116 or 122, or receiving circuits may be added as shown in incorporated U.S. patent application Ser. No. 08/733,684 which are completely apart from the power receiving circuits 106 and 108.
FIG. 9 shows a sketch of a base station 410 connected to a computer 420 which is used to send and receive RF signals 430 through antenna 440 to and from an RF tag 450 having two antennas 460 and 470.
Related U.S. patents assigned to the assignee of the present invention include: U.S. Pat. Nos. 5,521,601; 5,528,222; 5,538,803; 5,550,547; 5,552,778; 5,554,974; 5,563,583; 5,565,847; 5,606,323; 5,635,693; 5,673,037; 5,680,106; 5,682,143; 5,729,201; 5,729,697; 5,736,929; 5,739,754; 5,767,789; 5,77,561; 5,786,626; 5,812,065; 5,821,859; 5,850,181; and 5,874,902. U.S. patent applications assigned to the assignee of the present invention include: application Ser. No. 08/694,606 filed Aug. 9, 1996 entitled “RFID System with Write Broadcast Capability” by Cesar et al., (now U.S. Pat. No. 5,942,987 issued Aug. 24, 1999); application Ser. No. 08/790,639 filed Jan. 29, 1997, (now U.S. Pat. No. 6,097,347 issued Aug. 1, 2000); application Ser. No. 08/790,640 filed Jan. 29, 1997, (now U.S. Pat. No. 6,028,564 issued Feb. 22, 2000); application Ser. No. 09/153,617 filed Sep. 15, 1998, entitled “RFID Interrogator Signal Processing System for Reading Moving Transponder,” by Zai et al., (now U.S. Pat. No. 6,122,329 issued Sep. 19, 2000); application Ser. No. 08/862,149 filed May 23, 1997; application Ser. No. 08/862,912 filed May 23, 1997, (now U.S. Pat. No. 5,966,082 issued Oct. 12, 1999); application Ser. No. 08/862,913 filed May 23, 1997(now U.S. Pat. No. 6,288,629 issued Sep. 11, 2001); Application No. 60/079,852 filed Mar. 30, 1998; application Ser. No. 09/277,271 filed Mar. 26, 1999, (now U.S. Pat. No. 6,147,606 issued Nov. 14, 2000); application No. 60/079,391 filed Mar. 26, 1998; and U.S. application Ser. No. 09/192,052 filed Nov. 13, 1998 by Duan et al. entitled “Distributed Impedance Matching Circuit for High Reflection Coefficient Load”, (now U.S. Pat. No. 6,177,872 issued Jan. 23, 2001). The above identified U.S. patents and U.S. patent applications are hereby incorporated herein by reference in their entireties.—
The following U.S. provisional patent applications are hereby incorporated herein by reference in their entirety. Application No. 60/079,613, filed on Mar. 27, 1998 for Duan, et al., entitled “Methods of Maximizing Operating Distance for RFID Tags”. Application No. 60/078,287, filed on Mar. 17, 1998 for Duan, et al., entitled “Methods of Impedance Matching for Circularly-Polarized Patch Antenna RFID Tag”. Application No. 60/078,220, filed on Mar. 16, 1998 for Duan, et al., entitled “RFID Tags Using High Gain Antennas”.
Related U.S. patent application “Cascaded DC Voltages of Multiple Antenna RF Tag Front-end Circuits” with application Ser. No. 09/227,768 filed on Jan. 8, 1999 is herein incorporated by reference.
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International Classification H01Q1/22, G06K19/07, G06K7/00, G08B13/14, H01Q21/29, G01S13/75
Cooperative Classification G01S13/758, H01Q21/29, G06K19/0701, H01Q1/22, H01Q1/2225, G06K19/0713, G06K19/0723, G06K7/0008
European Classification G06K19/07A, G06K19/07A8, H01Q1/22C4, H01Q21/29, G06K7/00E, G06K19/07T, H01Q1/22