Mobile unit
First Claim
1. A mobile unit comprising:
- a LF antenna having a predetermined receiving frequency band and a predetermined gain to receive a LF signal;
a determination circuit configured to determine whether the LF signal received by the LF antenna is an authorized LF signal;
a controller configured to be activated in response to a determination by the determination circuit that the LF signal received by the LF antenna is the authorized LF signal;
a damping resistor connected to the LF antenna;
a switch configured to enable and disable the damping resistor; and
an antenna gain adjuster configured to reduce the gain of the LF antenna in response to a determination by the determination circuit that the LF signal received by the LF antenna is different from the authorized LF signal by controlling the switch in such a manner that the damping resistor is enabled.
1 Assignment
0 Petitions
Accused Products
Abstract
A mobile unit includes a LF antenna having a predetermined receiving frequency band and gain to receive a LF signal, a determination circuit for determining whether the LF signal received by the LF antenna is an authorized LF signal, a controller activated in response to a determination by the determination circuit that the LF signal received by the LF antenna is the authorized LF signal, a damping resistor connected to the LF antenna, a switch for enabling and disabling the damping resistor, and an antenna gain adjuster for reducing the gain of the LF antenna in response to a determination by the determination circuit that the LF signal received by the LF antenna is different from the authorized LF signal by controlling the switch in such a manner that the damping resistor is enabled.
19 Citations
6 Claims
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1. A mobile unit comprising:
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a LF antenna having a predetermined receiving frequency band and a predetermined gain to receive a LF signal; a determination circuit configured to determine whether the LF signal received by the LF antenna is an authorized LF signal; a controller configured to be activated in response to a determination by the determination circuit that the LF signal received by the LF antenna is the authorized LF signal; a damping resistor connected to the LF antenna; a switch configured to enable and disable the damping resistor; and an antenna gain adjuster configured to reduce the gain of the LF antenna in response to a determination by the determination circuit that the LF signal received by the LF antenna is different from the authorized LF signal by controlling the switch in such a manner that the damping resistor is enabled. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification