- Volume 2 Issue 1
A noble phased-array antenna of the circular form with microstrip slots was designed for steering the radiation beam and increasing the directivity and gain. The directivity and gain could be controlled, varying the number of slots and the radius of a circle, but here, the 40 .deg. beam scanning antenna system was achieved by tangentially arranging 4 mi- crostrip slots on a circumference and the analog phase shifter was used to adjust phase difference in the adjacent elements. And such a system has a microstrip configuration taking the effects of the line dispersion and discontinuities into account at 10 Ghz. The experimental results were fairly agreed with theoretical values, and this circular phased array had an improved performance over the rectangular phased array with 64-microstrip patches in a view of the number of array elements.