Amateur Extra › E9 Antennas and Transmission Lines › E9C03
E9C03
What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?
Pick an answer to check it.
Answer: C. A figure-eight broadside to the axis of the array
Two verticals a half wavelength apart fed in phase add broadside to the array and cancel along its axis. The pattern is a figure-eight broadside to the array.
Tip: Half wave, in phase: broadside figure-eight.