Responder in movable-object identification system

Assignee: OFFERTA DI LICENZA AL PUBBLICO;AL PUBBLICO

•

Filing: 1991-10-10

•

Granted: —

•

Expires: 2011-10-10

📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A movable-object identification system includes an interrogator for transmitting an interrogation signal, and a responder mounted on a movable object for transmitting a reply signal in response to the interrogation signal. The reply signal contains identification information. The responder includes an antenna for receiving the interrogation signal from the interrogator, and for radiating the reply signal; an input device connected to the antenna for receiving an electric power of the interrogation signal received by the antenna, the input device including a receiving element for dividing the received electric power into a first separation electric power and a second separation electric power corresponding to traveling wave and reflected wave respectively, the receiving element having an impedance; a generating device for generating predetermined identification information by the first separation electric power; and a modulating device, connected in parallel with the input device and connected to the antenna, for varying the impedance of the receiving element in accordance with the generated identification information, for modulating the second separation electric power of the interrogation signal in accordance with the identification information to generate the reply signal, and for feeding the reply signal to the antenna.

Inventors

👤 Tatsuya Hirata
👤 Yoshiyuki Kago

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-10-27 19:31

CPC Classifications

G; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/758

Claims Analysis

Total Claims: 3

Claim 1

Independent Claim 189 words

In a movable-object identification system including an interrogator for transmitting an interrogation signal, and a responder mounted on a movable object for transmitting a reply signal in response to the interrogation signal, the reply signal containing identification information, the responder comprising: an antenna for receiving the interrogation signal from the interrogator, and for radiating the reply signal; input means connected to the antenna for receiving an electric power of the interrogation signal received by the antenna, the input means including a receiving element for dividing the received electric power into a first separation electric power and a second separation electric power corresponding to traveling wave and reflected wave respectively, the receiving element having an impedance; generating means for generating predetermined identification information by the first separation electric power; and modulating means, connected in parallel with the input means and connected to the antenna, for varying the impedance of the receiving element in accordance with the generated identification information, for modulating the second separation electric power of the interrogation signal in accordance with the identification information to generate the reply signal, and for feeding the reply signal to the antenna.

Claim 2

Dependent Claim 59 words

The responder of claim 1 wherein the input means comprises rectifying means including a rectifying element for dividing the received electric power into the first and second separation electric powers at a ratio depending on a reflection coefficient of the rectifying element, and for rectifying the first separation electric power into a dc power which powers the generating means.

Claim 3

Dependent Claim 157 words

The responder of claim 1 wherein the input means comprises detecting means including a detecting element for dividing the received electric power into the first and second separation electric powers at a ratio depending on a reflection coefficient of the detecting element, and judgment means for outputting a transmission instruction signal to the generating means in cases where a voltage level of the first separation electric power is equal to or greater than a predetermined reference level; wherein the modulating means comprises means for varying the reflection coefficient of the detecting element in accordance with the identification information generated by the generating means, for modulating the second separation electric power in accordance with the identification information to generate the reply signal, and for feeding the reply signal to the antenna; and wherein the generating means comprises means for outputting the identification information to the modulating means in response to the transmission instruction signal from the judgment means.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag

Select Category

Notes (Optional)