Communications: radio wave antennas – Antennas – With lumped reactance filter in active antenna
Reexamination Certificate
2011-05-10
2011-05-10
Phan, Tho G (Department: 2821)
Communications: radio wave antennas
Antennas
With lumped reactance filter in active antenna
C343S876000, C331S1170FE, C340S010300
Reexamination Certificate
active
07940224
ABSTRACT:
It is an object of the present invention to provide a semiconductor device which can be surely supplied electric power by electromagnetic waves in different frequency bands without preventing reduction in size and weight of a semiconductor device. A semiconductor device capable of wireless communication is provided with a frequency determining circuit which detects the frequency of the electromagnetic waves received by the antenna and a circuit which automatically adjusts impedance in accordance with information from the frequency determining circuit, and the semiconductor device communicates and obtains electric power by one antenna. For adjustment of impedance, a circuit which can change the inductance or the capacitance, or an antenna which can change the length is used.
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Phan Tho G
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
Semiconductor Energy Laboratory Co,. Ltd.
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