EP0346922A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Signal transmission system
Assignee: Omron Corp
•
Filing: 1989-06-16
•
Granted: —
•
Expires: 2009-06-16
Abstract
Abstract A data transmission system includes a data carrier (20) which has a memory (29) for storing therein data including an identification code and which is attached to an object and a main apparatus (10) having a microwave oscillator (13) so as to conduct communications with the data carrier by use of a microwave, thereby writing data in or reading data from the memory of the data carrier. The main apparatus transmits a microwave modulated by a command or data and thereafter transmits a nonmodulated carrier for a predetermined period of time. On receiving a command, the data carrier executes a read/write operation on the memory and then generates a response. The data carrier receives the nonmodulated carrier sent from the main apparatus so as to conduct a modulation of quadrature phase-shift keying thereon by use of response data, thereby reflectively transmitting the modulated carrier with a plane of polarization shifted from a plane of polarization of the received wave by 90 DEG .
Inventors
- 👤 Akimitsu Omron Tateisi Electronics Co. Ogata
- 👤 Hisato Omron Tateisi Electronics Co. Fujisaka
- 👤 Sadao c/o K.K. KODEN SEISAKUSHO Igarashi
- 👤 Toshimitsu c/o K.K. KODEN SEISAKUSHO Nozu
- 👤 Katsura c/o K.K. KODEN SEISAKUSHO Onozato
- 👤 Masanobu c/o K.K. KODEN SEISAKUSHO Hirose
- 👤 Katsuji c/o K.K. KODEN SEISAKUSHO Miwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 20:19
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10316; G06K7/10346; G01; G01S; G01S13/00; G01S13/74; G01S13/82; G01S13/825
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
214 words
A signal transmission system comprsing a data carrier (20) which includes a memory (29) to store therein data including an identification code and which is attached to an object and a main apparatus (10) having a microwave oscillator (13) so as to effect communications with said data carrier by use of a microwave, thereby writing data in or reading data from the memory of said data carrier wherein: said main apparatus comprises first transmit means (11, 11a, 12, 13, 14, 18) for modulating a microwave by use of a command or data to be sent to said data carrier so as to transmit the modulated microwave and first receive means (11, 11b, 15, 16, 17 18, 31, 32) for receiving a microwave returned from said data carrier so as to demodulate the received microwave to obtain data; and said data carrier includes second receive means (22, 26, 27) for receiving a microwave sent from said main apparatus so as to demodulate the received microwave to obtain a command or data, control means (28) for executing a read/write operation on the memory depending on the received command, and second transmit means (21, 21a, 21b, 23, 24, 25, 33) for returning to the main apparatus response data indicating a read/write operation thus conducted on the memory.
Claim 2
Dependent Claim
214 words
A signal transmission system comprsing a data carrier (20) which includes a memory (29) to store therein data including an identification code and which is attached to an object and a main apparatus (10) having a microwave oscillator (13) so as to effect communications with said data carrier by use of a microwave, thereby writing data in or reading data from the memory of said data carrier wherein: said main apparatus comprises first transmit means (11, 11a, 12, 13, 14, 18) for modulating a microwave by use of a command or data to be sent to said data carrier so as to transmit the modulated microwave and first receive means (11, 11b, 15, 16, 17 18, 31, 32) for receiving a microwave returned from said data carrier so as to demodulate the received microwave to obtain data; and said data carrier includes second receive means (22, 26, 27) for receiving a microwave sent from said main apparatus so as to demodulate the received microwave to obtain a command or data, control means (28) for executing a read/write operation on the memory depending on the received command, and second transmit means (21, 21a, 21b, 23, 24, 25, 33) for returning to the main apparatus response data indicating a read/write operation thus conducted on the memory.
Claim 3
Dependent Claim
99 words
A signal transmission system according to claim 1 wherein: said first transmit means of said main apparatus include means (11, 11a, 13, 18) for transmitting a nonmodulated microwave carrier; and said second transmit means of said data carrier include antenna means (21, 21a, 21b) for receiving the nonmodulated microwave carrier and for reflectively transmitting a modulated microwave and modulate means (25) for changing reflection coefficients of the microwave in said antenna means in four levels in a sense of a vector depending on response data to be transmitted, thereby effecting a quadrature phase-shift keying on the received microwave carrier.
Claim 4
Dependent Claim
69 words
A signal transmission system according to claim 2 wherein: said first transmit means of said main apparatus modulate a microwave by use of a predetermined command so as to transmit the modulated wave and thereafter transmits a nonmodulated microwave for a predetermined period of time; and when said second receive means receive the command in said data carrier, said control means cause said modulate means to achieve an operation.
Claim 5
Dependent Claim
49 words
A signal transmission system according to claim 3 wherein said first transmit means of said main apparatus repeatedly conduct at a predetermined interval transmit porcessing inlcuding a transmission of a microwave modulated by use of a predetermine command and a transmission of a modulated microwave to be effected thereafter.
Claim 6
Dependent Claim
119 words
A signal transmission system according to claim 1 or 2 wherein: said first transmit means of said main apparatus includes means (11a, 13, 18) for transmitting a nonmodulated microwave carrier; and said second transmit means of said data carrier include antenna means (21a, 21b) for receiving the nonmodulated microwave carrier and for reflectively transmitting a modulated microwave, oscillate means (34) of a subcarrier, first modulate means (33) for modulating a subcarrier generated by said oscillate means by use of data to be transmitted, and second modulate means (25) for changing the reflection coefficients of the microwave in said antenna means depending on a signal outputted from said first modulate means, thereby conducting a modulation on the received microwave carrier.
Claim 7
Dependent Claim
86 words
A signal transmission system according to claim 5 wherein said first receive means of said main apparatus include: a mixer (15) for mixing a received signal with a signal having a carrier frequency; a band-pass filter (31) for extracting one of sideband waves respectively having central frequencies apart from the carrier frequency by a distance equivalent to the subcarrier frequency in higher and lower frequency directions; and demodulate means (16, 17, 32) for demodulating an output delivered from said band-pass filter so as to obtain data.
Claim 8
Dependent Claim
46 words
A signal transmission system according to claim 5 wherein said second modulate means include modulate means (25) for changing the reflection coefficients in said antenna means in four levels in a sense of a vector, thereby effecting a quadrature phase-shift keying on the received microwave carrier.
Claim 9
Dependent Claim
69 words
A signal transmission system according to claim 5 wherein: said first transmit means of said main apparatus modulate a microwave by use of a predetermined command so as to transmit the modulated wave and thereafter transmit a nonmodulated microwave for a predetermined period of time; and when said second receive means receive the command in said data carrier, said control means cause said modulate means to achieve an operation.
Claim 10
Dependent Claim
49 words
A signal transmission system according to claim 8 wherein said first transmit means of said main apparatus repeatedly conduct at a predetermined interval transmit porcessing inlcuding a transmission of a microwave modulated by use of a predetermine command and a transmission of a nonmodulated microwave to be effected thereafter.
Claim 11
Dependent Claim
111 words
A signal transmission system according to claim 1, 2, or 5 wherein: said first transmit means and said first receive means of said main apparatus are provided with a transmit/receive antenna (11) to be shared therebetween such that said transmit/receive antenna is configured to transmit a first microwave and to receive a second microwave having a plane of polarization shifted from a plane of polarization of said first microwave by 90° ; and said second transmit means of said data carrier include a reflection antenna (21) which is configured to transmit a microwave having a plane of polarization shifted from a plane of polarization of the received microwave by 90° .
Claim 12
Dependent Claim
47 words
A signal transmission system according to claim 10 wherein said second transmit means of said data carrier reflectively transmits a received microwave by means of said reflection antenna such that the reflection coefficients are changed by use of data to be transmitted, thereby modulating the received microwave.
Claim 13
Dependent Claim
48 words
A signal transmission system according to claim 1, 2, 5, or 10 wherein said first transmit means modulate a microwave carrier by use of a predetermined command so as to transmit the modulated microwave carrier and subsequently transmits a nonmodulated microwave carrier for a predetermined period of time.
Claim 14
Dependent Claim
48 words
A signal transmission system according to claim 12 wherein said first transmit means repeatedly conduct at a predetermined interval transmit processing including a pair of a transmission of a microwave modulated by use of a predetermine command and a transmission of a nonmodulated microwave to be effected thereafter.
Claim 15
Dependent Claim
76 words
A signal transmission system according to claim 1 wherein: said second receive means of said data carrier include a receive antenna (22) and means (26, 27) for demodulating a microwave received by said receive antenna; and said second transmit means include a reflection antenna (21) and modulate means (25) for modulating a nonmodulated microwave carrier received by said reflection antenna by use of data to be transmitted, thereby transmitting the modulated carrier from said reflection antenna.
Claim 16
Dependent Claim
28 words
A signal transmission system according to claim 14 wherein when said second receive means receive the command, said control means cause said modulate means to effect an operation.
Claim 17
Dependent Claim
36 words
A signal transmission system according to claim 14 wherein said reflection antenna is configured to transmit a microwave having a plane of polarization shifted from a plane of polarization of the received microwave by 90° .
Claim 18
Dependent Claim
98 words
A signal transmission system according to claim 1 wherein said second transmit means of said data carrier include: a transmit/receive antenna (21); a distributed constant modulator circuit (25) including two lines respectively connected via predetermined transmission paths to a transmit port and a receive port respectively of said transmit/receive antenna, said two lines having a difference of λ/8 therebetween; and diodes (D1, D2) respectively connected to end terminals of two lines of said distributed constant modulator circuit such that said diodes are turned on and off by signals representing data to be transmitted, thereby changing the reflection coefficients.
Claim 19
Dependent Claim
175 words
A data transmission method wherein: a microwave carrier is modulated by use of a predetermined command and is then transmitted from a main apparatus (10) and thereafter a nonmodulated microwave carrier is transmitted therefrom for a predetermined period of time such that a set of the transmission of the modulated wave and the subsequent transmission of the nonmodulated wave is repeatedly carried out at a predetermined interval of time; on receiving the command, a data carrier (20) modulates the nonmodulated microwave carrier received after the command by use of initial response data so as to transmit the resultant carrier as a reflection wave; and the main apparatus further modulates a microwave carrier by use of a command or data so as to transmit the modulated carrier and thereafter transmits a nonmodulated microwave carrier such that on receiving the command or data, the data carrier modulates the received nonmodulated microwave by use of response data so as to transmit the resultant wave, thereby achieving a half duplex communication between the main apparatus and the data carrier.
Claim 20
Dependent Claim
175 words
A data transmission method wherein: a microwave carrier is modulated by use of a predetermined command and is then transmitted from a main apparatus (10) and thereafter a nonmodulated microwave carrier is transmitted therefrom for a predetermined period of time such that a set of the transmission of the modulated wave and the subsequent transmission of the nonmodulated wave is repeatedly carried out at a predetermined interval of time; on receiving the command, a data carrier (20) modulates the nonmodulated microwave carrier received after the command by use of initial response data so as to transmit the resultant carrier as a reflection wave; and the main apparatus further modulates a microwave carrier by use of a command or data so as to transmit the modulated carrier and thereafter transmits a nonmodulated microwave carrier such that on receiving the command or data, the data carrier modulates the received nonmodulated microwave by use of response data so as to transmit the resultant wave, thereby achieving a half duplex communication between the main apparatus and the data carrier.
Claim 21
Dependent Claim
21 words
A signal transmission method according to claim 18 wherein said initial response data include an identification code of the data carrier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.