Studies on Performance Characteristics of Waveguide-Fed Slot Arrays

Abstract

The paper presents the investigation made on the performance of waveguide slot arrays. The variation of insertion loss and input reflection co-efficient of waveguide-fed slot arrays has been determined with change in inter-element spacing and frequency. For the cases of arrays using longitudinal slots, investigation has been made for the variation of inter-element spacing over the range 360° + 36°. These investigations have been extended to the case of arrays using obliquely displaced slots in the broad wall of a waveguide. The variation of the distribution of excitation amplitude with frequency for different inter-element spacings has also been determined. The results show that over the frequency range of interest, the input reflection co-efficient can be considerably reduced and the insertion loss can be maintained at a large desired value by suitably changing the parameters of the slot and of slot array. The design considerations for the optimum performance of such arrays over a large frequency band have been presented.

Indexing Term:

• Slot Arrays