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OwnerVinko Kunc, Anton Sterninventors
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In a non-contacting smart card interrogator (1) a first end (A) of an eighth-wave transmission line (13) is connected to a terminal connecting a first receiver (16) to a transmission line (14), and to a second end (B) of the transmission line (14) the carrier wave generator (11) is connected. To the first end (A) of the eighth-wave transmission line (13) the first amplitude demodulation receiver (16) and to the second end (B) thereof a second amplitude demodulation receiver (16′) are connected. In the non-contacting smart card interrogator of the invention an effective use of amplitude demodulation is made possible by changing the phase modulation into an amplitude one by means of a passive element, whereby, however, no noise source has been introduced into the system.
Non-contacting smart card interrogator (1), in which across a transmission line from an antenna (15) to a receiver the signal modulation varies between the amplitude and the phase ones and which comprises a carrier wave generator (11) and an amplitude demodulation receiver (16), both being connected to the antenna (15) through a transmission line 14, characterized in that to a terminal connecting the amplitude demodulation receiver (16) to the transmission line (14), a first end (A) of an eighth-wave transmission line (13) is connected, and to a second end (B) thereof the carrier wave generator (11) is connected, and that a signal at the first end (A) and a signal at the second end (B) of the eighth-wave transmission line (13) are sensed.
Dependencies are inferred from the claim text.