5.8 Antenna coupler, AT-1560
5-50
The antenna includes resistance, Ra and reactance components. As the wavelength of
MF band is longer than the antenna length, the antenna becomes capacitive. The
matching circuit needs to cancel the capacitance by adjusting the coil inductance. The
coil is called the loading coil. The inductance in the matching circuit is the sum of the
matching inductance and inductivity of the reactance coil.
Fig.5.8.5 Antenna equivalent circuit
Fig.5.8.6 shows inductances necessary in the matching circuit to cancel the antenna
capacitance.
Fig.5.8.6
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