Which of the following generates the same field pattern as a vertical dipole antenna?(a) Yagi antenna(b) Helix antenna(c) Alford loop(d) Microstrip antennaThis question was addressed to me in a job interview.Question is taken from Point Source Radio Systems topic in section Terrestrial Radio Navigation System of Avionics

Which of the following generates the same field pattern as a vertical

1.	Which of the following generates the same field pattern as a vertical dipole antenna?(a) Yagi antenna(b) Helix antenna(c) Alford loop(d) Microstrip antennaThis question was addressed to me in a job interview.Question is taken from Point Source Radio Systems topic in section Terrestrial Radio Navigation System of Avionics
Answer» Right option is (c) Alford loop Explanation: Each radiator in the GROUND station transmitter is an Alford loop. The Alford loop GENERATES a horizontal polarized signal having the same FIELD PATTERN as a vertical DIPOLE.

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