We propose a novel $4{ imes}4$ Hadamard matrix feed network for a $4{ imes}1$ array antenna to form a dual beam. If each element of the array is excited following the elements in a row of the Hadamard matrix, a two-lobed antenna beam can be obtained. The angle between the two lobes can be controlled. The Hadamard matrix feed network consists of four $90^{circ}$ hybrids, a crossover and four $90^{circ}$ phase shifters. The array, including the Hadamard matrix feed network, was fabricated on a microstip structure. The measured beam directions of the two lobes are $0^{circ}$, ${pm}15^{circ}$, ${pm}33^{circ}$, ${pm}45^{circ}$ depending on the choice of the input port of the feed network.