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E9C01:What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

E9C01E9C

What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E9C01 is A figure-eight oriented along the axis of the array.

The key fact is A figure-eight oriented along the axis of the array. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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More questions in E9C

E9C02What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?E9C03What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?E9C04What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?E9C05What is the purpose of feeding an off-center-fed dipole (OCFD) between the center and one end instead of at the midpoint?E9C06What is the effect of adding a terminating resistor to a rhombic or long-wire antenna?E9C07What is the approximate feed point impedance at the center of a two-wire half-wave folded dipole antenna?