DocumentCode :
1521260
Title :
An active integrated retrodirective transponder for remote information retrieval-on-demand
Author :
Miyamoto, Ryan Y. ; Qian, Yongxi ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Volume :
49
Issue :
9
fYear :
2001
fDate :
9/1/2001 12:00:00 AM
Firstpage :
1658
Lastpage :
1662
Abstract :
A retrodirective transponder based on a novel compact phase-conjugating mixer with conversion gain has been developed. The active circuit uses one port for both incoming and outgoing signals, enabling a reduction of circuit size, and the balanced structure provides suppression of undesired signals. By using a modulated local oscillator, the circuit can modulate the received signal in order to retransmit local information to the remote site. A microstrip antenna is integrated with the phase conjugator and the whole system was fabricated on a single substrate, enabling a one-card system. A four-element prototype array with 0.5λ0 array spacing demonstrated excellent measured retrodirectivity. Additionally, a simplified binary-phase-shift-keying signal transmitted by the array is recovered successfully at the source location, demonstrating great potential for remote tagging and wireless sensor applications
Keywords :
active antenna arrays; directive antennas; microstrip antenna arrays; microwave mixers; mobile communication; phase shift keying; radar cross-sections; transponders; RCS; active integrated retrodirective transponder; balanced structure; binary PSK signal; binary-phase-shift-keying signal; compact phase-conjugating mixer; conversion gain; four-element prototype array; microstrip antenna; modulated local oscillator; one-card system; remote information retrieval-on-demand; remote tagging applications; wireless sensor applications; Active circuits; Antenna measurements; Local oscillators; Microstrip antenna arrays; Microstrip antennas; Position measurement; Prototypes; Sensor arrays; Tagging; Transponders;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/22.942580
Filename :
942580
Link To Document :
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