Radio system for data transmission with one passive end and station included in such a system
First Claim
1. A radio system for alternatively transmitting by microwaves first and second data signals (D12, D21) between first and second data processing units (U1, U2) connected to said radio system, said first data signal (D12) being transmitted from said first unit (U1) to said second unit (U2) during first data transmission periods, and said second data signal (D21) being transmitted from said second unit (U2) to said first unit (U1) during said second data transmission periods,said system comprising data signal transmitting and receiving central and terminal stations (1, 2),said transmitting and receiving central station (1) being connected to said first unit (U1) for emitting a first microwave (PA) modulated by said first data signal (D12) during said first transmission periods and a second unmodulated microwave (P) during said second transmission periods to said terminal station, said first and second emitted microwaves (PA, P) having a first linear polarization,said transmitting and receiving terminal station (D) being connected to said second unit (U2) and comprising:
- an antenna (20) having two first ports (HO, Hπ
) arranged to transduce said first linear polarization and two second ports (Vπ
, VO) arranged to transduce a second linear polarization, the second linear polarization being relative to said first linear polarization,means (21,
22) connected to one (Hπ
) of said first antenna ports for detecting said first data signal (D12) in the first modulated microwave (PA) thereby applying a replica of said first data signal to said second unit (U2), anda microwave switcher (23) having an input (230) connected to the other (HO) of said first antenna ports and two outputs (232a, 232b) respectively connected to said second antenna ports (Vπ
, VO), said second data signal (D21) controlling said microwave switcher so said switcher derives in response to said second microwave (P) received via said switcher input (230), a third microwave (PP) modulated in two phase states by said second data signal (D21) and transmitted according to said second polarization by said antenna (20) towards said central station (1) during said second data transmission periods.
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Accused Products
Abstract
The radio system embodying the invention comprises a central station and a terminal stations or passive end. Data signals are transmitted between data processing units which are respectively connected to the central and terminal stations. The radio system is essentially characterized in that the terminal station comprises a square two-dimensional antenna and a microwave switcher so as to phase modulate, by means of a data signal, a microwave transmitted from the terminal station to the central station. This phase modulated microwave is produced from an incident microwave transmitted by the central station and issued to the terminal station by the square two-dimensional antenna. The design of the terminal station is very simple and compact and can be included, as well as the corresponding data processing unit, in a contact-free chip card.
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Citations
11 Claims
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1. A radio system for alternatively transmitting by microwaves first and second data signals (D12, D21) between first and second data processing units (U1, U2) connected to said radio system, said first data signal (D12) being transmitted from said first unit (U1) to said second unit (U2) during first data transmission periods, and said second data signal (D21) being transmitted from said second unit (U2) to said first unit (U1) during said second data transmission periods,
said system comprising data signal transmitting and receiving central and terminal stations (1, 2), said transmitting and receiving central station (1) being connected to said first unit (U1) for emitting a first microwave (PA) modulated by said first data signal (D12) during said first transmission periods and a second unmodulated microwave (P) during said second transmission periods to said terminal station, said first and second emitted microwaves (PA, P) having a first linear polarization, said transmitting and receiving terminal station (D) being connected to said second unit (U2) and comprising: -
an antenna (20) having two first ports (HO, Hπ
) arranged to transduce said first linear polarization and two second ports (Vπ
, VO) arranged to transduce a second linear polarization, the second linear polarization being relative to said first linear polarization,means (21,
22) connected to one (Hπ
) of said first antenna ports for detecting said first data signal (D12) in the first modulated microwave (PA) thereby applying a replica of said first data signal to said second unit (U2), anda microwave switcher (23) having an input (230) connected to the other (HO) of said first antenna ports and two outputs (232a, 232b) respectively connected to said second antenna ports (Vπ
, VO), said second data signal (D21) controlling said microwave switcher so said switcher derives in response to said second microwave (P) received via said switcher input (230), a third microwave (PP) modulated in two phase states by said second data signal (D21) and transmitted according to said second polarization by said antenna (20) towards said central station (1) during said second data transmission periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transmitting and receiving terminal station for a radio system wherein microwaves alternatively transmit first and second data signals (D12, D21) between first and second data processing units (U1, U2) connected to said radio system, said first data signal (D12) being transmitted from said first unit (U1) to said second unit (U2) during first data transmission periods, and said second data signal (D21) being transmitted from said second unit (U2) to said first unit (U1) during second data transmission periods, a transmitting and receiving central station (1) being connected to said first unit (U1) emitting a first microwave (PA) modulated by said first data signal (D12) during said first transmission periods and a second unmodulated microwave (P) during said second transmission periods to said terminal station, said first and second emitted microwaves (PA, P) having a first linear polarization,
said transmitting and receiving terminal station (2) being connected to said second unit (U2) and comprising: -
an antenna (20) having two first ports (HO, Hπ
) arranged to transduce said first linear polarization and two second ports (Vπ
, VO) arranged to transduce a second linear polarization, the second linear polarization being crossed relative to said first linear polarization,means (21,
22) connected to one (Hπ
) of said first antenna ports for detecting said first data signal (D12) in the first modulated microwave (PA) thereby applying a replica of said first data signal to said second unit (U2), anda microwave switcher (23) having an input (230) connected to the other (HO) of said first antenna ports and two outputs (232a, 232b) respectively connected to said second antenna ports (Vπ
, VO), said second data signal (D21) controlling said microwave switcher so said switcher derives in response to said second microwave (P) received via said switcher input (230), a third microwave (PP) modulated in two phase states by said second data signal (D21) and transmitted according to said second polarization by said antenna (20) towards said central station (1) during said second data transmission periods. - View Dependent Claims (11)
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Specification