Answering device for a system for the automatic wireless transmission of multi-position data between interrogation devices and answering devices movable with respect to one another
US4070672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1976 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Jul 9, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61L25/045
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An answering device in a system for automatic wireless transmission of an item of information coded by a plurality of frequencies is disclosed herein. An interrogation device movable with respect to the answering device transmits an interrogation signal having a frequency which periodically varies within a predetermined microwave frequency band. The answering device has a plurality of microwave resonators, each of which has a fixed frequency. A microwave diode is coupled to each of the resonators for preventing a response to the interrogation signal by either damping or detuning the resonator fixed frequency when a control voltage is applied. The control voltage means connected to each of the microwave diodes switches certain of the resonators to an inoperative condition to establish a set of frequencies at which the resonators will respond which corresponds to the information to be transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.