Title:
トランスポンダ
Document Type and Number:
Japanese Patent JP4588220
Kind Code:
B2
Abstract:
A transponder comprises a retro-reflective antenna array in which the length of the transmission lines is given by I=±A nlambda where: A is an arbitrary length; n is zero, or an integer, lambda is the wavelength of the retro-reflected signal. The array is fabricated on a board (71) of insulating material, using microstrip techniques. Rectangular patches (not shown) form the individual antennae and these are interconnected by transmission lines (75 to 82), each of which pass through a respective modulation device (43) whereby the retro-reflected signal is modulated. A positioning/tracking system incorporating one or more modulated transponders is also disclosed.
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Inventors:
Edwards, David John
Thornton, John
Thornton, John
Application Number:
JP2000608468A
Publication Date:
November 24, 2010
Filing Date:
March 24, 2000
Export Citation:
Assignee:
ISIS INNOVATION LIMITED
International Classes:
H01Q3/26; G01S13/75; G01S13/76; G01S13/79; H01Q1/22; H01Q1/38; H01Q3/46
Domestic Patent References:
| JP7198838A | ||||
| JP7046028A | ||||
| JP2000151268A | ||||
| JP11510981A |
Foreign References:
| US5822683 | ||||
| US5064140 | ||||
| WO1997044920A1 |
Attorney, Agent or Firm:
Kazuo Shamoto
Shosuke Imai
Tadashi Masui
Yasushi Kobayashi
Hiroyuki Tomita
Fumitoshi Nishiyama
Shosuke Imai
Tadashi Masui
Yasushi Kobayashi
Hiroyuki Tomita
Fumitoshi Nishiyama