Interrogator circuit arrangement

Details Interrogator circuit arrangement Interrogator circuit arrangement

1997-08-07

2000-04-04

Zimmerman, Brian

Communications: electrical

Selective

Interrogation response

3405722, H04Q 100

Patent

active

060466685

ABSTRACT:
An interrogator circuit (2) for use with a semi-passive transponder (30) of a type which reflectively modulates an incoming signal (28) is described. The circuit (2) comprises an antenna (4), a transistor (8), a matching network (6) connecting to the antenna (4) to an input of the transistor and means (12, 14) for operating the transistor such that it self-oscillates and radiates power (28) from the antenna (4) and simultaneously acts as a self-oscillating mixer to produce an output (40) which is representative of the modulation of a signal 32 received at the antenna. For an efficient conversion gain the reflection coefficient of the antenna (4) is configured to be low when the circuit is in a stable self-oscillating condition.

REFERENCES:
patent: 4219779 (1980-08-01), Shinkawa et al.
patent: 4334324 (1982-06-01), Hoover
patent: 4605909 (1986-08-01), Tsironis
patent: 4658440 (1987-04-01), Pavio et al.
patent: 5250944 (1993-10-01), Urbas et al.
patent: 5355137 (1994-10-01), Schurmann
patent: 5465418 (1995-11-01), Zhou et al.

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