Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Unique identity
Patent
1992-06-12
1994-01-18
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Unique identity
342364, G01S 1374
Patent
active
052802868
ABSTRACT:
An antenna system (20) in transponder article surveillance and identification system (10) employs a separate interrogating transmitting antenna (31) and interrogating receiving antenna (41) both of which are circularly polarized in opposite hand senses whereby very little of a transmitted electromagnetic interrogation signal is coupled to the interrogation receiving antenna (41) and reflections from nearby surfaces are transparent, significantly improving system performance. Interrogating transmitting antenna (31) and interrogating receiving antenna (41) are cavity-backed, crossed-dipole-fed antennas producing a substantially hemispherical radiation pattern. Transponder (11) is mounted together with a dipole antenna (50) on a tag (13) carried on each article to be identified. Dipole antenna (50) includes two substantially paddle-shaped radiating members (52,53) formed upon a substrate (54), each paddle-shaped radiating member (52, 53) having an end centrally disposed on substrate (54) terminating at an angle whereby the impedance of dipole antenna (50) substantially matches the impedance of the transponder (12) in electrical connection therewith.
REFERENCES:
patent: 3745569 (1973-07-01), Works et al.
patent: 4063229 (1977-12-01), Welsh et al.
patent: 4471344 (1984-09-01), Williams
patent: 4527152 (1985-07-01), Scarr et al.
patent: 4633250 (1986-12-01), Anderson, III et al.
patent: 4679046 (1987-07-01), Curtis et al.
patent: 4700179 (1987-10-01), Fancher
A. Kumar & H. D. Hristov, Microwave Cavity Antennas, pp. vii-ix & 101-107 (1989).
S. Drabowitch & C. Ancona, Antennas vol. 2 Applications, pp. 176-177 (1988).
Thomas A. Milligan, Modern Antenna Design, p. 77 (1985).
Y. T. Lo & S. W. Lee, Antenna Handbook Theory, Applications, and Design, pp. 17-137-17-139 (1988).
Constantine A. Balanis, Antenna Theory Analysis and Design, pp. 330-332 (1982).
Edward C. Jordan & Keith G. Balmain, Electromagnetic Waves and Radiating Systems, pp. 513-519 (2nd Edition, 1968).
Blum Theodore M.
Smart Tag Systems, Inc.
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