MOUNTING TYPE RECEIVER, MOUNTING TYPE TRANSMITTER, MOUNTING TYPE TRANSMITTER-RECEIVER, ANTENNA, RECEIVER, TRANSMITTER, AND TRANSMITTER-RECEIVER

摘要

An antenna (100), comprising a core (101) formed of ferrite and an antenna copper plate (102) wound generally one turn on the outer periphery of the core (101). The length L1 of the core (101) is equal to the length L2 of the antenna copper plate (102), and the width W1 of the core (101) is equal to the width W2 of the antenna copper plate (102). Also, the height H1 of the core (101) and the height H2 of the antenna copper plate (102) are set to be equal to each other or so that one of these heights is larger (or smaller) than the other according to required reception characteristics.