| 摘要 |
<p>1. Passive-type transponder especially intended for seeking out persons by means of a combined seeking transmitter-receiver (1) capable of transmitting at a first frequency (fo ) and receiving at a second frequency (2fo ) which is a harmonic of said first frequency, said transponder being capable to receive at said first frequency (fo ) and to transmit at said second frequency (2fo ) and including a dielectric support (11, 21, 23) to which is fixed an antenna (12, 12A, 12B, 12C) formed from a thin conductive sheet (12, 12A, 12B, 12C), said antenna including a non-linear passive component (19, 19A, 19B, 19C) as well as a conductive portion (16) electrically parallel to said component and forming a direct current-bypass for biaising of said component, this transponder being characterized in that said conductive sheet (12, 12A, 12B, 12C) comprises a cut-out portion (15, 15A, 15B, 15C) the edge of which (17, 18) defines a conductive path closed on said passive component (19, 19A, 19B, 19C), the shape of said cut-out portion being selected so as to form on the one hand said direct current-bypass, and on the other hand a self-inductive loop (14C) which together with the internal capacity (cj) of the component provides a circuit resonating at said first frequency (fo ).</p> |
