Transponder useful in a system for identifying objects

Details Transponder useful in a system for identifying objects Transponder useful in a system for identifying objects

1986-07-14

1988-11-22

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Radar transponder only

342 44, G01S 956

Patent

active

047869070

ABSTRACT:
A reader transmits interrogating rf signals to a transponder including an antenna having a particular impedance. The signals received by the antenna are converted to a direct voltage which is introduced to a first terminal of a switch such as an emitter of a semi-conductor device having conductive and non-conductive states of operation. A second terminal of the switch, such as the base of the semi-conductor device, receives a voltage variable between first and second magnitudes in accordance with a pattern of binary 1's and 0's in a data source such as a read-only memory (ROM). This pattern of binary 1's and 0's is individual to an object identified by the transponder. The variable voltage on the base of the semi-conductor device causes the emitter-collector current of the semi-conductor device to vary between first and second amplitudes. When this current has the first amplitude, the impedance of the semi-conductor device and the ROM substantially matches the antenna impedance. When this current has the second amplitude, the impedance of the semi-conductor device and the ROM is substantially greater than the antenna impedance. Capacitance may be connected to the collector of the semi-conductor device and the ROM to store energy in accordance with the current flow through the semi-conductor device. This stored energy provides for an energizing of the semi-conductor device and the ROM. A diode may be connected between the emitter and collector of the semi-conductor device to increase the second amplitude of the current through the semi-conductor device.

REFERENCES:
patent: 3914762 (1975-10-01), Klensch
patent: 4044303 (1977-08-01), Reindel
patent: 4068232 (1978-01-01), Meyers et al.
patent: 4068232 (1978-01-01), Meyers et al.
patent: 4069472 (1978-01-01), Kamata et al.
patent: 4196418 (1980-04-01), Kip et al.
patent: 4358765 (1982-11-01), Henoch et al.
patent: 4658263 (1987-04-01), Urbanski

Affiliated with

Also associated with

Rating

Transponder useful in a system for identifying objects does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transponder useful in a system for identifying objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transponder useful in a system for identifying objects will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-437655