RADIO FREQUENCY-BASED SELF-ENROLMENT AND DATA EXCHANGE METHODS FOR BIOMETRIC SMART CARDS AND NON-SELF-POWERED AUTHENTICATION DEVICES

Abstract

The present invention relates to transfer methods of wireless power to non-self-powered biometric authentication devices through far-field radio waves coming from a nearby self-powered radio frequency device. By default, the non-self-powered biometric authentication device of the invention is made of a far-field radio microwave antenna, an antenna tuner, a RF-to-DC power rectifier and power converter functions. The transfer methods of wireless power to non-self-powered biometric authentication devices of the invention are particularly well-suited for self-enrolment of one user's identity on biometric smart cards but can also be applied for subsequent data exchange such as peer-to-peer money transfer.

Claims

1. A non-self-powered biometric authentication device comprising a far-field radio microwave antenna, an antenna tuner, a power rectifier and power converter functions in order to wirelessly power that same authentication device, during the initial identity self-enrollment phase and subsequent data exchanges, through far-field radio waves coming from a nearby self-powered radio frequency device.

2. A non-self-powered biometric authentication device, as recited in claim 1, reusing the existing loop antenna already integrated into biometric smart card inlay but tuned to a microwave frequency and further connected to one of the biometric smart card active silicon integrated circuits through wire connectors

3. A non-self-powered biometric authentication device, as recited in claim 1, further comprising a second smaller loop antenna integrated within one of the biometric smart card active silicon integrated circuits and being inductively-coupled with the existing loop antenna already integrated into biometric smart card inlay

4. A non-self-powered biometric authentication device, as recited in claim 3, wherein the second smaller loop antenna is integrated within the top substrate of one of the biometric smart card active silicon integrated circuits

5. A non-self-powered biometric authentication device, as recited in claim 3. wherein the second smaller loop antenna is integrated within the bottom substrate of one of the biometric smart card active silicon integrated circuits

6. A non-self-powered biometric authentication device, as recited in claim 3, wherein the second smaller loop antenna is integrated within the silicon substrate of one of the biometric smart card active silicon integrated circuits

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0014] A more complete appreciation of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings. In these drawings like reference numerals designate identical or corresponding parts throughout the several views.

[0015] FIG. 1 shows, in a three-dimensional space, a biometric smart card with a micro-chip module, a fingerprint sensor and optional loop antenna implemented within the card inlay; FIG. 2 illustrates, in a three-dimensional space, the battery-powered sleeve with open slot used to power biometric smart card during enrollment; FIG. 3a cross-section view shows an embodiment of the biometric smart card according to the invention, with either the micro-chip module or fingerprint sensor, embedding the microwave frequency-tuned PMIC block, line-connected to the loop antenna of the card inlay; FIG. 3b cross-section view illustrates another embodiment of the biometric smart card according to the invention with either the micro-chip module or fingerprint sensor, embedding the microwave frequency-tuned PMIC block, connected to the loop antenna of the card inlay through inductive coupling via its own loop antenna implemented within the top substrate; and FIG. 3c cross-section view shows another embodiment of the biometric smart card according to the invention with either the micro-chip module or fingerprint sensor, embedding the microwave frequency-tuned PMIC block, connected to the loop antenna of the card inlay through inductive coupling via its own loop antenna implemented within the bottom substrate.

DETAILED DESCRIPTION OF THE INVENTION

[0016] Referring to those drawings and more specifically to FIG. 3a, either the micro-chip module or fingerprint sensor (310) active silicon die (308) of the biometric smart card (101) comes equipped with a microwave frequency-tuned PMIC block (305), integrating impedance-matching elements, RF-to-DC power rectifier and power conversion functions. The active silicon die is attached to the top substrate (304), covered by glob top and/or epoxy mold compound (307) for mechanical protection, and dropped within a cavity (302) of the card body (303) typically done through mechanical or laser milling.

[0017] In a preferred embodiment of the present invention, the microwave frequency-tuned PMIC block (305) is connected to the loop antenna (104) of the card inlay (301) through both wire bond connect ion (306) and the top substrate (304) line connectors.

[0018] In the embodiments of the present invention shown in FIGS. 3b and 3c, the biometric smart card (101) according to the invention further includes an additional smaller loop antenna (309), either placed within the top substrate (304) or bottom substrate (311) of the active silicon die, thereby connecting the microwave frequency-tuned PMIC block (305) to the larger card inlay (301) loop antenna (104) through inductive coupling.

[0019] Although the biometric smart cards illustrated in FIGS. 3a, 3b and 3c respectively show a larger loop antenna within the card inlay, alternate embodiments may not implement such large loop antenna within the card inlay. For instance, and according to non-illustrated embodiments of the present invention, a single smaller loop antenna, either placed within the top substrate or bottom substrate of the active silicon die, can solely be connected to the microwave frequency-tuned PMIC block. As such, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.

[0020] FIG. 4a shows the microwave radio-frequency signal (e.g. Bluetooth with de-whitener sequence so as to operate on a fixed frequency, Wi-Fi smartphone mobile hotspot function, Wi-Fi home/office access point, mobile phone frequency signal) emitted by a self-powered communication device (401), such as a cell phone or wireless access point, used to wireless power the biometric smart card (101), equipped with a micro-chip module (102) and fingerprint sensor (103) as described above, during identity self-enrollment phase. FIG. 4b shows that same microwave radio-frequency signal emitted by a self-powered communication device (401) used to wireless power two biometric smart cards (101) for data exchange between each other, such as peer-to-peer money transfer (e.g. e-wallets), through inter-backscattering communication.