Analysis and design of coplanar waveguide-fed slot antenna array

A method for analyzing and designing the slot antenna array excited by a co planar waveguide (CPW) is presented, The slots are etched on the conducting plane of the CPW and placed in the direction perpendicular to the transmis sion line. Moment-method analysis and matrix-pencil approach are adopted to calculate the scattering parameters and hence the self-admittance of each slot. The mutual admittances between the slots are calculated from the form ulas derived for the complementary strip dipoles based on the reciprocity t heorem and via Booker's relation. Then the transmission line theory is used to calculate the input impedance of the array, and an iterative process is employed to obtain a matched design for a desired slot-voltage distributio n. A four-element slot array is fabricated and measured using this design p rocedure. Calculated results are in good agreement with measurements.