In this paper we discuss analysis and synthesis techniques for planar circular arrays usable in passive HF target ranging. The elements geometries are assumed and analyzed for the array. The frequencies of the bands are taken as; S-band (2 and 4) GHz, C-band (5 and 8) GHz and X-band (9 and 12.4) GHz. The frequencies are taken for the initial and terminal of the specified bands. The circular dish array antenna was used to study the three - dimensional array radiation pattern for circular aperture with diameter (0.3m) at a given wavelength. Linear and polar array radiation patterns were analyzed. It was noted that the number of side lobes increases either by increasing element spacing or by increasing operating frequency. In array design, the positions of sparse array elements is an important concern for optimal performance A new and very fast low-side lobe pattern synthesis method for planar array antennas with periodic element spacing is described.Read Complete Article at ijSciences: V3201408557