Patent US5021790A successfully refreshed from Google Patents.
US5021790A
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Microwave date transmission apparatus
Assignee: Sharp Corp
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Filing: 1990-05-14
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Granted: 1991-06-04
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Expires: 2010-05-14
Abstract
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.
Inventors
- 👤 Tomozo Ohta
- 👤 Hiroshi Nakano
- 👤 Kazutada Higashi
- 👤 Hirohiko Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:15
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/765; G01S13/78; G01S13/82; G01S13/825; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/0723; G06K7/00; G06K7/0008; G07; G07C; G07C3/00; G07C9/00; G07C9/20; G07C9/28
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
192 words
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 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.
Claim 2
Dependent Claim
192 words
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 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.
Claim 3
Dependent Claim
29 words
The microwave data transmission apparatus of claim 1 wherein said modulated microwave signals and said non-modulated microwave carrier signals are of mutually different first and second type polarizations respectively.
Claim 4
Dependent Claim
21 words
The microwave data transmission apparatus of claim 2 wherein said first and second type polarizations comprise mutually different circular type polarizations.
Claim 5
Dependent Claim
21 words
The microwave data transmission apparatus of claim 3 wherein said mutually different circular type polarizations include right-hand and left-hand circular polarizations.
Claim 6
Dependent Claim
22 words
The microwave data transmission apparatus of claim 2 wherein said first and second type polarizations include circular polarization and linear polarization respectively.
Claim 7
Dependent Claim
21 words
The microwave data transmission apparatus of claim 2 wherein said first and second type polarizations comprise mutually different type linear polarizations.
Claim 8
Dependent Claim
39 words
The microwave data transmission apparatus of claim 6 wherein one of said mutually different type linear polarizations comprises a 0° direction linear polarization and the other of said mutually different type linear polarizations comprises a 90° direction linear polarization.
Claim 9
Dependent Claim
174 words
A microwave data transmission apparatus comprising: 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.
Claim 10
Dependent Claim
174 words
A microwave data transmission apparatus comprising: 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.
Claim 11
Dependent Claim
44 words
The microwave data transmission apparatus of claim 8 wherein said control means comprises built-in power supply means which periodically renders said control means operable upon receipt of a power starting signal transmitted from said interrogator means during a third sub-period of said modulation signal.
Claim 12
Dependent Claim
181 words
An interrogator/responder comprising: 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.
Claim 13
Dependent Claim
181 words
An interrogator/responder comprising: 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.
Claim 14
Dependent Claim
18 words
The interrogator/responder of claim 10 wherein said first and second type polarizations comprise mutually different circular type polarizations.
Claim 15
Dependent Claim
18 words
The interrogator/responder of claim 11 wherein said mutually different circular type polarizations include right-hand and left-hand circular polarizations.
Claim 16
Dependent Claim
19 words
The interrogator/responder of claim 10 wherein said first and second type polarizations include circular polarization and linear polarization, respectively.
Claim 17
Dependent Claim
18 words
The interrogator/responder of claim 10 wherein said first and second type polarizations comprise mutually different type linear polarizations.
Claim 18
Dependent Claim
36 words
The interrogator/responder of claim 14 wherein one of said mutually different type linear polarizations comprises a 0° direction linear polarization and the other of said mutually different type linear polarizations comprises a 90° direction linear polarization.
Claim 19
Dependent Claim
42 words
The interrogator/responder of claim 10 wherein said control means comprises built in power supply means which periodically renders said control means operable upon receipt of a power starting signal transmitted from said interrogator means during a third sub-period of said modulation signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |