Abstract:
An apparatus includes a housing and a circuit including an inductor and at least one capacitor in electrical communication with the inductor. The circuit has a resonance frequency and bounds a non-electrically-conductive region of the housing. The circuit is configured to be operable as an antenna.
Abstract:
L'invention concerne une antenne, notamment pour carte à puce à fonctionnement sans contact, composée d'un circuit résonnant de type RLC série ou parallèle comportant une capacité totale C, une inductance totale L, et une résistance série R, et ayant une fréquence de résonance F0 donnée par la formule F0 = 1/2TW0-C), caractérisée en ce qu'elle comporte des moyens d'ajustement sélectif de la capacité C, ou de l'inductance L, ou pour l'ajustement combiné de la capacité C et de l'inductance L.
Abstract:
An antenna arrangement includes a switch having an open state and a closed state, a first antenna that operates as a first active driven element in a first frequency band in response to the switch being in the open state, and a second antenna that operates as a second active driven element in a first frequency band in response to the switch being in the open state. The closed state configures the first antenna and the second antenna to operate in a second frequency band different from the first frequency band by operatively coupling a first impedance multiband antenna arrangementbetween the first antenna and a radio frequency ground, and by operatively coupling a second impedance between the second antenna and the radio frequency ground. The first antenna functions as a parasitic element in the second frequency band and the second antenna functions as an active driven element in the second frequency band.