| 摘要 |
<p>PURPOSE:To obtain a radio wave key which is high in the radio emission efficiency and also which is less attenuated, by applying a silver plating on the antenna core material for transmission of radio wave key locking or unlocking the key by radiowave and further, reducing the electric resistance of the superficial part. CONSTITUTION:Silver plating is applied on the core material 14 of a transmission antenna equipped within the case 2 of radio wave key locking or unlocking a door or a trunk of a car by means of radio wave. When a switch 16 is turned on in order to lock or unlock the lock equipped in the car side, a transmitter 10 is actuated and key signals are transmitted from the antenna core material 14 on the transmission frequency of UHF bond. In this time, high frequency current is conducted in the superficial part of antenna 14, but since the silver plating is low in the electric resistance, little energy is lost and hence, it is efficiently transmitted. In this way, a radio wave key with less attenuation can be obtained.</p> |
