Antennas
Half Wave Antenna (3)
- An antenna that is shorter than a half wavelength at the frequency of operation
will have capacitive reactance as well as resistance at its feed point
- An antenna that is longer than a half wavelength at the frequency
of operation will have inductive reactance as well as resistance at its feed point
- An aerial tuning unit would generally be used to “tune out”
the capacitive or inductive reactance and present a resistive load to the 50Ω
output of the transmitter (Tx)
- The antenna system and Tx are then said to be “matched”