Koninklijke Philips Corporation N.v.

Mark Peter Paul Kleijnen

Rick Bezemer

Wouter Herman Peeters

Gerardus Johannes Nicolaas Doodeman

Jacobus Josephus Leijssen

Ronny Hubertus Johannes Grosfeld

Tim Patrick Steunebrink

An inductive sensing device comprises first () and second () loops, the first loop () being coupled with a capacitor to form a resonator circuit (), and the resonator circuit and second loop being coupled via an active buffering component (). The active buffering component provides voltage to current amplification, and an output of the buffering component drives a current in the second loop. Conductive lines forming each of the first and second loop parts are radially spaced apart.

Inductive sensing device and method

An apparatus () for use in inductive sensing includes a loop antenna () and a signal generator () for driving the antenna, these forming a resonator circuit (). The resonator circuit is drivable in a drive state in which the antenna is driven at resonance to thereby generate electromagnetic signals. The arrangement further includes a switching means () for switchably inhibiting the drive state of the antenna This allows in use controllable switching of the antenna in and out of the drive state to thereby control switching signal generation on and off.

Apparatus for use in inductive sensing

The invention provides a magnetic inductive sensing device () comprising a loop antenna () for inductively coupling with electromagnetic (EM) signals emitted from a medium in response to stimulation of the medium with electromagnetic excitation signals. The device includes an electromagnetic shield () element which is arranged such as to intercept electromagnetic signals travelling to or from the antenna. The shield element is formed of conductive material such as to block electrical field components of incident signals but further incorporates a non-conductive gap in the material so as to prevent the formation of eddy currents. A loop of the antenna is broken by an opening, the opening being bridged by a capacitor, and the device comprises a signal processing means which is electrically coupled to the antenna via only a single point of the antenna, located to one side of the opening.

Magnetic inductive sensing device and method

The invention provides a magnetic inductive sensing system for sensing electromagnetic signals emitted from a body in response to electromagnetic excitation signals applied to the body. The electromagnetic signals are generated and sensed by the same loop resonator which comprises a single-turn loop antenna and a tuning capacitor. The loop antenna of the resonator and a signal generation means for exciting the resonator to generate excitation signals are together configured so as to optimize the value of a ratio between the radial frequency of the generated electromagnetic excitation signals and a reference frequency of the antenna, where the reference frequency is the frequency for which one wavelength of the generated excitation signals (waves) matches the circumferential length of the antenna. This ratio, which corresponds to a normalized radial frequency of the generated excitation signals, is maintained between a value of 0.025 and 0.50.

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Eindhoven, Netherlands

Mark Peter Paul Kleijnen