An excited 1/2 wavelength antenna produces:

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Multiple Choice

An excited 1/2 wavelength antenna produces:

A half-wavelength antenna, when driven at resonance, has charges that move back and forth and currents that change with time. This creates an electric field from the oscillating charges and a magnetic field from the changing current. In the region close to the antenna (the near field), both of these components exist and behave like reactive or electrostatic-type fields, while at a distance the energy is radiated away as electromagnetic waves with synchronized electric and magnetic fields. So an excited lambda/2 antenna has both the near-field electrostatic-type components and the radiated electromagnetic field, making the correct description a combination of both.

A half-wavelength antenna, when driven at resonance, has charges that move back and forth and currents that change with time. This creates an electric field from the oscillating charges and a magnetic field from the changing current. In the region close to the antenna (the near field), both of these components exist and behave like reactive or electrostatic-type fields, while at a distance the energy is radiated away as electromagnetic waves with synchronized electric and magnetic fields. So an excited lambda/2 antenna has both the near-field electrostatic-type components and the radiated electromagnetic field, making the correct description a combination of both.

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