designing and simulation of the microstrip antenna array with series feed

in this article, the linear array (with 20 elements in the horizontal orientation) of microstrip antenna is examined with horizontal polarization. the set includes three microstrip substrates. there is a power network in two lower substrates and microstrip patches in the upper substrate. excitation of patches has been done as coupled through the power network in two lower substrates. using the slot between patches and feed transmission lines, the electric fields are coupled from the power network to the microstrip patches. separation of the feed network from the radiating part of the antenna causes for the cross-polarization component to be less than-50 db. on the other hand, in order to reach the appropriate side lobe level (sll) in the horizontal orientation, the array is tapered using chebyshev weights. after antenna simulation, sll<-18 db is achieved in the final structure. this radiation pattern is fan beam and can be used in radar and communication systems