A semi-theoretical design procedure for the linear edge slot arrays

A new algorithm for the design of linear edge slot arrays is presented. The main feature is the theoretical consideration of mutual couplings between slot apertures. Based upon the characteristics of the computed mutual impedance between edge slots and the theoretical admittance of an isolated slot in the waveguide with zero wall thickness, the phase of the mutual impedance and the absolute ratio of mutual impedance to self impedance in realistic condition are reasonably assumed. Under this assumption, the design curve of isolated slot admittances and incremental conductances are interpolated from the measured reflection coefficients of 12 test sections. Thus a linear array can be achieved by recursively choosing a set of slot inclinations and depths and comparing the computed active admittances of these slots with the desired coupling coefficients. An example of designing a Ka band linear edge slot array with -30 dB SLL Taylor´s distribution is presented to show the validity of this algorithm