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A microwave noncontact identification transponder using subharmonic interrogation

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2 Author(s)
Pobanz, Carl W. ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; Itoh, T.

This paper presents the design and analysis of a novel microwave radio (RF/ID) transponder that has been developed for remote identification of personnel and articles, such as in “wireless key” entry systems. Based on 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 two X-band frequencies. These response signals are nonharmonically related to the interrogation signal. The frequency conversion process is analyzed using a Volterra series model that includes the effects of self-bias current, coupled with a scattering metric that is directly useful in radio link calculations

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 7 )