Title :
A microwave noncontact identification transponder using subharmonic interrogation
Author :
Pobanz, Carl W. ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
7/1/1995 12:00:00 AM
Abstract :
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
Keywords :
Volterra series; biometrics (access control); equivalent circuits; identification; losses; microwave circuits; microwave frequency convertors; microwave links; microwave mixers; microwave receivers; nonlinear network analysis; radio transmitters; transponders; C-band interrogation beam; SHF; Volterra series model; X-band frequencies; digitally modulated identification tone; frequency conversion process; microwave noncontact identification transponder; microwave radio transponder; quasi-optical mixer; radio link calculations; remote identification; scattering metric; self-bias current; subharmonic interrogation; subharmonically pumped mixer; wireless key entry systems; Coupled mode analysis; Digital modulation; Frequency conversion; Laser excitation; Mixers; Optical modulation; Personnel; Radio frequency; Radiofrequency identification; Transponders;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
