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An RF multiplier integrated planar antenna for DOA estimation

A new RF multiplier integrated planar antenna is proposed to enhance the estimation capability of a phase monopulse direction-of-arrival (DOA) estimation antenna. The conventional monopulse DOA estimation antenna determines the arrival angle using only the amplitude ratio of the sum (Σ) and difference (Δ) of the signals received by two antennas. Hence, it can be used only for the half angle of the space. The proposed antenna employs an RF multiplier to detect the phase relation between the Σ and Δ signals and increase the range of the estimation angle. The basic concept of the proposed antenna is experimentally confirmed by using a prototype antenna.