Microwave noncontact identification transponder using subharmoni

Details Microwave noncontact identification transponder using subharmoni Microwave noncontact identification transponder using subharmoni

1995-05-12

1996-06-11

Sotomayor, John B.

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

Radar transponder system

Radar transponder only

342 44, G01S 1376

Patent

active

055259936

ABSTRACT:
A credit-card sized microwave transponder for "wireless key" and surveillance applications uses a subharmonically-pumped quasi-optical mixer. The transponder is activated by a C-band interrogation beam to upconvert and radiate a digitally modulated identification tone at X-band frequencies nonharmonically related to the interrogation signal.

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patent: 4827395 (1989-05-01), Anders et al.
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patent: 5448243 (1995-09-01), Bethke et al.
"An Automatic Vehicle ID System for Toll Collecting," L. Livermore Natl Lab Report No. UCRL-TB-113409, Apr. 1993.
P. deBruyne et al, "Radar Surveillance of Autobahn Toll".
T. Ohta et al., "Compact Microwave remote recognition system with newly developed SSB moduclation," IEEE MTT-S Digest pp. 957-960 (1990).
R. Page, "A Low Power RF ID Transponder," RF Design, pp. 31-35, Jul. 1993.

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