Microwave date transmission apparatus
First Claim
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1. A microwave data transmission apparatus comprising:
- interrogator means including first transceiving means for transmitting modulated microwave signals during a modulation period and non-modulated microwave carrier signals during a non-modulation period and for receiving microwave signals; and
identification tag means including memory means, second transceiving means and control processing means, with built-in power supply means which periodically renders said control means operational upon receipt of a power starting signal transmitted from said interrogator during a first sub-period of said modulation period, for controlling said identification tag,said control means operable in response to a control signal of a first or second state, transmitted from said interrogator during a second sub-period of said modulation period tostore data transmitted from said interrogator during a third sub-period of said modulation period into said memory means in response to said control signal of said first state, andread data previously stored in said memory means to modulate said non-modulated microwave carrier signals, transmitted from said interrogator during said non-modulation period, with said stored data for transmission by said second transceiving means back to said interrogator means in response to said control signal of said second state.
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Abstract
A microwave data transmission apparatus adapted to transmit and receive information by microwaves, in which an identification tag is made smaller in size and lighter in weight to considerably improve the convenience in a setting operation for use in many applications. The apparatus can be applied for production control within a factory or can be used to recognize whether a person wearing an identification tag has entered or left a room.
20 Citations
16 Claims
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1. A microwave data transmission apparatus comprising:
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interrogator means including first transceiving means for transmitting modulated microwave signals during a modulation period and non-modulated microwave carrier signals during a non-modulation period and for receiving microwave signals; and identification tag means including memory means, second transceiving means and control processing means, with built-in power supply means which periodically renders said control means operational upon receipt of a power starting signal transmitted from said interrogator during a first sub-period of said modulation period, for controlling said identification tag, said control means operable in response to a control signal of a first or second state, transmitted from said interrogator during a second sub-period of said modulation period to store data transmitted from said interrogator during a third sub-period of said modulation period into said memory means in response to said control signal of said first state, and read data previously stored in said memory means to modulate said non-modulated microwave carrier signals, transmitted from said interrogator during said non-modulation period, with said stored data for transmission by said second transceiving means back to said interrogator means in response to said control signal of said second state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A microwave data transmission apparatus comprising:
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interrogator means including first transceiving means for transmitting in time sequence a modulation signal of frequency F and a first polarization and a non-modulation carrier signal of a frequency f and a second polarization and for receiving a modulation signal of frequency f and said second polarization; and responder means including memory means, second transceiver means, and control means operable in response to a control signal, of a first or second state, transmitted from said interrogator means during a first sub-period of said modulation signal to store data transmitted from said interrogator means, during a second sub-period of said modulation signal, into said memory means in response to said control signal of said first state, and read data previously stored in said memory means to modulate said non-modulated carrier signal, transmitted from said interrogator means, with said stored data for transmission back to said interrogator means as a return modulation signal, of frequency f and said second polarization, in response to said control signal of said second state. - View Dependent Claims (9)
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10. An interrogator/responder comprising:
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interrogator means including first transceiving means for transmitting modulated microwave signals of a first type polarization during a modulation period and non-modulated microwave carrier signals of a second type polarization during a non-modulation period and for receiving microwave signals of said second type polarization; and responder means including memory means, second transceiver means, and control means wherein said control means is responsive to a control signal, of a first or second state, transmitted from said interrogator during a first sub-period of said modulation period to store data transmitted from said interrogator during a second sub-period of said modulation period into said memory means in response to receipt of said first control signal of said first state by said second transceiving means, and read data previously stored in said memory means to modulate said non-modulated microwave carrier signals with said stored data for transmission back to said interrogator means, by said second transceiver means, as a return microwave signal of said second type polarization in response to said control signal of said second state by said second transceiving means. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification