Radio system for data transmission with passive terminal station

Details Radio system for data transmission with passive terminal station Radio system for data transmission with passive terminal station

1990-08-06

1992-11-17

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

342 44, 342 51, H04B 500

Patent

active

051647192

ABSTRACT:
The radio system embodying the invention comprises a central station and a passive terminal station. First and second data signals are transmitted between data processing units respectively connected to the central and terminal stations. The terminal station comprises a same low-cost circuit associated with a square two-dimensional antenna for detecting the amplitude of a first incident microwave emitted by the central station thereby recovering the first data signal and deriving, in response to the first microwaves, a microwave modulated in phase by the second data signal by means of a retroreflection of a second incident microwave. This second incident microwave is emitted by the central station to the two-dimensional antenna of the terminal station. The terminal station is of very simple design, is compact and can therefore be included as well as the corresponding data processing unit in a contact-free chip card.

REFERENCES:
patent: 4857893 (1989-08-01), Carroll
patent: 4956645 (1990-09-01), Guena et al.

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