Source: http://www.google.com/patents/US8049625?dq=7,496,943
Timestamp: 2015-03-03 00:59:26
Document Index: 251945294

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

Patent US8049625 - High-performance mobile power antennas - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn 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/US8049625?utm_source=gb-gplus-sharePatent US8049625 - High-performance mobile power antennasAdvanced Patent SearchPublication numberUS8049625 B1Publication typeGrantApplication numberUS 12/412,627Publication dateNov 1, 2011Filing dateMar 27, 2009Priority dateAug 31, 1995Publication number12412627, 412627, US 8049625 B1, US 8049625B1, US-B1-8049625, US8049625 B1, US8049625B1InventorsDah-Weih Duan, Daniel J. Friedman, Harley Kent Heinrich, Ian Bardwell-Jones, Louis R. RuggieroOriginal AssigneeIntermac Technologies CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Classifications (5) External Links: USPTO, USPTO Assignment, EspacenetHigh-performance mobile power antennas
US 8049625 B1Abstract
1. An RF tag system for collecting power from an electromagnetic field with a carrier frequency comprising:
an antenna-power collection circuit configuration that is substantially resonant at the carrier frequency and is excited by the electromagnetic field to cause an induced current to be present at antenna terminals of the antenna-power collection circuit configuration;
the antenna-power collection circuit configuration comprising one or more rectifiers that rectifies the induced current at the antenna terminals;
one or more capacitors that collects the rectified induced current to develop a voltage sufficient to power an electric circuit; and
attached RF tag circuitry comprising the electric circuit.
2. An RF tag system, as in claim 1, where the one or more rectifiers and the one or more capacitors comprise a half wave rectifier.
3. An RF tag system, as in claim 1, where the one or more rectifiers and the one or more capacitors comprise a full wave rectifier.
4. An RF tag system, as in claim 1, where the one or more rectifiers and the one or more capacitors comprise a voltage N multiplier circuit.
5. An RF tag system, as in claim 1, where the antenna-power collection circuit configuration comprises a dipole antenna.
6. An RF tag system, as in claim 1, where the antenna-power collection circuit configuration comprises a folded dipole antenna.
7. An RF tag system, as in claim 1, where the antenna-power collection circuit configuration comprises a bent dipole antenna.
8. An RF tag system as in claim 1, where the antenna-power collection circuit configuration comprises a bent, folded dipole antenna.
9. An antenna power collector system for collecting power from an electromagnetic field with a carrier frequency comprising:
an antenna-power collection circuit configuration that is substantially resonant with the carrier frequency and is excited by the electromagnetic field that causes an induced current to be present at antenna terminals of the antenna-power collection circuit configuration;
the antenna-power collection circuit configuration comprising one or more rectifiers that rectifies the induced current at the antenna terminals; and
one or more capacitors that collect the rectified induced current to develop a voltage sufficient to power an electric circuit.
10. An antenna power collector system, as in claim 9, where the one or more rectifiers and the one or more capacitors comprise a half wave rectifier.
11. An antenna power collector system, as in claim 9, where the one or more rectifiers and the one or more capacitors comprises a full wave rectifier.
12. An antenna power collector system, as in claim 9, where the one or more rectifiers and the one or more capacitors comprises a voltage doubling circuit.
13. An antenna power collector system, as in claim 9, where the one or more rectifiers and the one or more capacitors comprises a voltage N multiplier circuit.
14. An antenna power collector system, as in claim 9, where the antenna-power collection circuit configuration comprises a dipole antenna.
15. An antenna power collector system, as in claim 9, where the antenna-power collection circuit configuration comprises a folded dipole antenna.
16. An antenna power collector system, as in claim 9, where the antenna-power collection circuit configuration comprises a bent dipole antenna.
17. An antenna power collector system, as in claim 9, where the antenna-power collection circuit configuration comprises a bent, folded dipole antenna.
18. An antenna power collector system for collecting power from an electromagnetic field with a carrier frequency comprising:
a modulation circuit that shorts and opens antenna terminals of the antenna-power collection circuit configuration at a modulation frequency in order to change the antenna impedance;
one or more capacitors that collect the rectified induced current to develop a voltage sufficient to power an electric circuit, the voltage being developed within one period of the modulation frequency.
19. An antenna power collector system, as in claim 18, where, the capacitors are combined with the rectifiers to form two or more rectifier circuits that are connected in series to increase the voltage that powers the electric circuit.
20. An antenna power collector system, as in claim 18, where the antenna-power collection circuit configuration comprises a dipole antenna.
21. An antenna power collector system, as in claim 18, where the antenna-power collection circuit configuration comprises a folded dipole antenna.
22. An antenna power collector system, as in claim 18, where the antenna-power collection circuit configuration comprises a bent dipole antenna.
23. An antenna power collector system, as in claim 18, where the antenna-power collection circuit configuration comprises a bent, folded dipole antenna.
24. An antenna power collector system for collecting power from an electromagnetic field with a carrier frequency comprising:
an antenna-power collection circuit configuration comprising an array of two or more dipole antennas, the antenna-power collection circuit configuration being substantially resonant at the carrier frequency and being excited by the electromagnetic field to cause an induced current to be present at two antenna terminals on each of the antennas, the induced current being at the carrier frequency;
the antenna-power collection circuit configuration comprising one or more rectifiers associated with each antenna that rectifies the induced current at the antenna terminals of each antenna respectively;
a modulation circuit that shorts and opens all the antenna terminals at a modulation frequency in order to change the antenna impedance of each antenna;
one more capacitors associated with each antenna that collects the rectified induced current and together with the rectifier associated with the respective antenna forms a rectifier circuit for each antenna;
the rectifier circuit for each antenna being connected in series to develop a voltage sufficient to power an electric circuit, the voltage being developed within one period of the modulation frequency.
25. An antenna power collecting system, as in claim 24, where one or more of the rectifying circuits is a half wave rectifier.
29. An antenna power collecting system, as in claim 24, where one or more of the dipole antennas is coplanar with the connections connecting the rectifier circuits.
30. An antenna power collecting system, as in claim 29, where one or more of the dipole antennas is a folded dipole antenna.
33. An antenna power collecting system, as in claim 30, where one or more of the folded dipole antennas surrounds one or more other folded dipole antennas.
34. An antenna power collecting system, as in claim 33, where the folded dipole antennas are within twenty percent of each other in length. Description
The present application is a continuation of application Ser. No. 11/694,229 filed Mar. 30, 2007, to issue as U.S. Pat. No. 7,511,621 dated Mar. 31, 2009, which 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, now abandoned, 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 applications No. 60/070,347 filed Jan. 2, 1998 and No. 60/086,972 filed May 28, 1998, and U.S. Pat. Nos. 6,400,274, 6,243,013, 5,889,489, 5,850,181 and 5,606,323 are each incorporated herein by reference in its entirety. All of the above identified patents and patent applications are hereby incorporated herein by reference in their entirety including incorporated material.
One may use a cascaded antenna array to achieve ultra-high rectified voltages as shown in FIG. 4, in which the element antennas, being illustrated by dipoles, can be any of those depicted in FIG. 1A-1D, 2A-2D, or 3A-3D. The rectified voltage is increased N times for N antennas in tandem. For all antennas mentioned above, a pair of not-high-impedance leads is used to extract the power to the load (circuitry). The range of optimum impedance for each configuration depends on the antenna impedance, can be determined experimentally using a pair of leads with variable resistance.
From FIGS. 7 and 8, it is easy to see that one patch antenna may be combined with one dipole antenna to produce more voltage than a single antenna. Note also that patch antennas 302 and 304 could both be circular polarized antennas of opposite handedness, so that at least some voltage would be generated by the combination, where a single antenna might not receive any power or information. In the same way, dipole antennas 102 and 104 could be constructed so that they are mutually perpendicular, instead of parallel as shown. In this case, linearly polarized
RF radiation would give at least some power to the combination of the two antennas.
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.
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