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US 2011/0210823 A1Published application
Hdx demodulator
AssigneeAleis Pty Ltd
InventorLeigh Bateman
Life of this patent
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Abstract
Low noise mixers for use in RFID readers and RFID readers configured to receive data from ISO HDX transponders in accordance with embodiments of the invention are illustrated. One embodiment of the invention receives the HDX FSK signal using a resonant antenna, upwardly mixes the FSK signal to an intermediate frequency, filters the intermediate frequency FSK signal using at least one ceramic bandpass filter, and demodulates the filtered intermediate frequency FSK signal to produce a binary output.
Claims17
A process for demodulating a low frequency HDX FSK signal, comprising:
- receiving the HDX FSK signal using a resonant antenna;
- upwardly mixing the FSK signal to an intermediate frequency;
- filtering the intermediate frequency FSK signal using at least one ceramic bandpass filter;
- and
- demodulating the filtered intermediate frequency FSK signal to produce a binary output.
2 more elements
An RFID receiver, comprising:
- a resonant antenna configured to receive an FSK signal from an HDX transponder;
- a mixer configured to upwardly mix an FSK signal received via the resonant antenna to an intermediate frequency;
- at least one ceramic filter configured to bandpass filter the intermediate frequency FSK signal;
- at least one intermediate frequency amplifier configured to amplify the filtered frequency intermediate FSK signal;
- and
- a demodulator configured to demodulate the filtered intermediate frequency FSK signal and detect binary data.
3 more elements
Dependencies are inferred from the claim text.