ANTENNA FOR DIRECTION FINDER

PURPOSE:To enable to perform an operation to find a direction, by a method wherein each pair of vertical (or horizontal) antenna are placed on straight lines crossing each other at right angles, a directivity is found from a difference between (or a total of) the outputs of each pair of the antennas, and a sensitive output from a total (or a difference). CONSTITUTION:Pairs of vertical antennas Ve, Vw and Vn, Vs are placed at a distance of 2l on straight lines X and Y, respectively, which cross each other at right angles. The output of the Vn and Vs are connected to transformers Mn and Ms, having two secondary windings, and a total of or a difference between the outputs of the antennas Vn and Vs is outputted to output terminals Oa and Ob. Like tis, the outputs of the Ve and V2 are connected and a total of a difference between the Ve and Vw is outputted. If an electric wave of Eosinomegat comes from the direction of an angle theta, when the effective height of the antenna is H, a total of the outputs of the antenna is 4HEosinomegat and goes to a sensitivity output. A difference output goes to 2HEoomegalcostheta.sinomegat and 2HEoomegalsinomega.sinomegat, and goes to a function of theta to indicate a directivity. Against an electromagnetic wave having a horizontal polarization, the same result is obtained using horizontal dipole antennas Hn, Hs, He, and Hw. This permits finding of a direction without the need for a nondirectional antenna.