整不明白啊
e9c01 (d)
what is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-
wavelength apart and fed 180 degrees out of phase?
d. a figure-8 oriented along the axis of the array
~~
e9c02 (a)
what is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-
wavelength apart and fed 90 degrees out of phase?
a. a cardioid
~~e9c03 (c)
what is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-
wavelength apart and fed in phase?
c. a figure-8 broadside to the axis of the array