Communications: directive radio wave systems and devices (e.g. – Radar transponder system – With telemetry
Patent
1991-08-07
1994-05-17
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
With telemetry
342 51, 342 44, G01S 1380
Patent
active
053132114
ABSTRACT:
A detachable IC card applicable to a portable data processing device referred to as an "electronic organizer" is disclosed. The IC card is formed of microstrip lines formed on a dielectric substrate. An antenna receives an externally applied unmodulated carrier signal and guides the received signal to microstrip lines for impedance conversion. Cathode potential of a diode is varied in response to a data signal outputted from a CPU, so that the barrier capacitance of the diode varies. Accordingly, the carrier is reflected according to the data signal and radiated toward the electronic organizer main body through the antenna. An oscillator for data transmission is not required in the IC card, so that an internal battery having a large capacitance is not required, either. As a result, without increasing the size and weight of the device, radio transmission of data from the IC card can be accomplished.
REFERENCES:
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4114151 (1978-09-01), Denne et al.
patent: 4160971 (1979-07-01), Jones et al.
patent: 4656472 (1987-04-01), Walton
patent: 4694297 (1987-09-01), Sewards
patent: 4786907 (1988-11-01), Koelle
patent: 4816839 (1989-03-01), Landt
patent: 4926182 (1990-05-01), Ohta et al.
patent: 4926187 (1990-05-01), Sugawara et al.
patent: 4938976 (1991-01-01), Ogata et al.
patent: 5021790 (1991-06-01), Ohta et al.
"Microwave Smart Tag" Matsushita Electric Works Giho No. 40 (Mar. 1990) pp. 14-17 (with translation).
"An X-band System Using Semipassive Signpost Reflectors for Automatic Location and Tracking of Vehicles" IEEE Feb. 1977.
"Data Carrier System and Adaption Thereof" J. IEE Japan, vol. 110 No. 1, 1990 -pp. 27-34.
Nakano Hiroshi
Ohta Tomozo
Tokuda Masamori
Sharp Kabushiki Kaisha
Sotomayor John B.
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