Impedance matching coil assembly for an inductively coupled tran

Details Impedance matching coil assembly for an inductively coupled tran Impedance matching coil assembly for an inductively coupled tran

1989-08-30

1992-01-28

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082572, 343867, 343742, 336182, 336183, 336184, H04Q 100, H01F 500

Patent

active

050846990

ABSTRACT:
A coil assembly for use in an inductively powered transponder including a primary coil and a secondary coil wrapped around the same coil forming ferrite rod. The primary coil's leads are left floating while the secondary coil's leads are connected to the integrated identification circuit of the transponder. There are approximately three times as many turns to the primary coil as there are turns to the secondary coil. The primary coil is configured to self resonate at the operating frequency of the identification circuit when brought within range of an interrogator's magnetic field, thereby creating a voltage across the primary coil having a high source impedance. The secondary coil is configured to resonate at the same operating frequency, but to convert the high source impedance level of the primary coil to a low source impedance level, which is more suitable for powering the identification circuit and which substantially matches the impedance level of the secondary coil to the impedance level of the interrogator field, thereby maximizing the quantity of energy which can be transferred between the interrogator and the transponder.

REFERENCES:
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 4450431 (1984-05-01), Hochstein
patent: 4630044 (1986-12-01), Polzer
patent: 4658263 (1987-04-01), Urbanski
patent: 4868915 (1989-09-01), Anderson, III et al.

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