End fire commutated linear antenna array - for simulated Doppler ground beacon guidance, with each element giving same radiation pattern

摘要

The array operates as an entire array of n elements in which n-1 elements are successively excited in accordance with a commutation (scan) programme. As each element is excited, the immediately adjacent element to the rear (opposite the radiation direction) has a base loading circuit activated such that it acts as a short circuit and therefore the element itself acts as a reflector in cooperation with the excited element. At the same time all other elements are provided with base loadings so that they are open circuited and appear transparent for radiation purposes. A dummy parasite reflector behind the first element of the array (not commutated) has a fixed short-circuit loading at its base. Thus the radiation pattern is the same in the forward direction during the successive excitation of the commutated elements.