Linear array of microstrip antennas with sector radiation pattern operating in the X-band

In this paper a linear antenna array utilizing sector radiation pattern is presented. The Fourier transform method is used for synthesis, from which the obtained excitation coefficients determine the resultant radiation pattern for an arbitrary sector. Moreover, the influence of a single radiating element radiation pattern is considered which is used to act as a counterweight to compensate the degradation which occur at the sector boundaries, by modifying the array factor. Theoretical examples for this phenomenon are presented, whereas for the purpose of this paper a nine-element linear array with 90° sector was designed and manufactured in order to verify this concept.