Antennas
Half Wave Antenna (1)
- The fundamental antenna is a length of wire which is an electrical half wavelength long
- The antenna is said to be resonant at the frequency at which it is
an electrical half wavelength long; at the resonant frequency it will present a resistive load
- The voltage and current distribution on a half wave antenna is shown above
- Note that the voltage is highest (greatest danger of RF burns!!) at the ends of a half wave dipole
- At the centre of a half wave dipole, the current will be highest and the voltage low
- Similarly, at the base of a quarter wave antenna, the current will be highest and the voltage low