Reactively coupled elements in circuits on flexible substrates

Details Reactively coupled elements in circuits on flexible substrates Reactively coupled elements in circuits on flexible substrates

1998-03-03

2001-01-30

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

High frequency type loops

C343S793000, C342S164000

Reexamination Certificate

active

06181287

ABSTRACT:

This invention relates to RF circuits and, more particularly, to reactively coupled elements of said circuits, particularly those disposed on flexible substrates.
BACKGROUND OF THE INVENTION
It is well known to those skilled in the art that the goal in the design and manufacture of RFID tags is to provide low-cost miniature components which, when assembled, will be susceptible of incorporation in a wide variety of applications where miniaturization and low cost are requisite.
Typical of prior art attempts at miniaturization and low cost are the arrangement of the components of the circuit in a uniform plane with the conductors incorporated in the circuit disposed in said plane.
However, the conductive securement of the IC circuit to the antenna continues to pose problems in that it increases the thickness of the assemblage and prevents the utilization of such combinations in many applications such as miniaturized PFID tags.
Consequently, in ultra-miniature circuits, for example RFID tags, miniaturizing circuit dimensions and decreasing production costs are ongoing objectives. Recent patents teach methods of implementing this miniaturization with respect to attachment of the integrated circuits to the antenna by the simplest, lowest profile and most economical means conceived of at the time (e.g., Marsh U.S. Pat. No. 5,566,441 and Moskovitz U.S. Pat. No. 5,528,222).
OBJECTS AND ADVANTAGES OF THE INVENTION
An object of my invention is the provision of a circuit for eliminating conductors between the IC components of an RFID and the associated antenna materially reducing the overall cost and increasing the utility of the IC/antenna combination.
Another object of my invention is the provision of an RFID circuit wherein the electrical conductors between electronic circuit elements are supplanted by electromagnetically reactive capacitive coupling means, utilizing electrically conductive areas such as inks, films, or foils on thin insulating dielectric substrates.
Another object of my invention is the provision of circuits of the aforementioned character wherein inductive coupling means are utilized in substitution for said capacitive coupling means.
An additional object of my invention is the provision of circuitry of the aforementioned character wherein the conductive and capacitive coupling means are supplanted by the utilization of lumped coupling means.
A further object of my invention is the incorporation of an RFID circuit of the aforementioned character in an identification device utilizing flexible substrates, such as, for example, sheet polymer materials utilized in identification wristbands wherein the components of the RFID can be placed on superimposed strips of polymer sheets and electronic communication between the components of the RFID is established by capacitive coupling means.
An additional object of my invention is a provision of an assemblage of the aforementioned character wherein the capacitive coupling means is supplanted by inductive coupling means.
A further object of my invention is the provision of an RFID assemblage mounted in a flexible identification wristband formed from flexible polymers wherein superimposed laminae of said flexible polymers include an RFID circuit incorporating lumped electronic conductor means.
Other objects and advantages of my invention will be apparent from the following specification and the accompanying drawings which are for the purpose of illustration only.


REFERENCES:
patent: 4835524 (1989-05-01), Lamond et al.
patent: 5142270 (1992-08-01), Appalucci et al.
patent: 5223849 (1993-06-01), Kasevich et al.
patent: 5483827 (1996-01-01), Kulka et al.
patent: 5521601 (1996-05-01), Kandlur et al.
patent: 5607417 (1997-03-01), de Vall
patent: 5708419 (1998-01-01), Isaacson et al.
patent: 5914862 (1999-06-01), Ferguson

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