Analysis and synthesis of a waveguide slot antenna with a predetermined amplitude distribution

 

V. I. Kalinichev

Kotelnikov Institute of Radio-engineering and Electronics of RAS

 

The paper is received on December 1, 2015

 

Abstract. The problem of analysis and synthesis of a leaky wave antenna on a rectangular waveguide with an equidistant array of dual slots in the wide wall and predetermined amplitude field distribution along the waveguide is considered. Using the finite-element method, the calculations of the complex propagation constant in periodic waveguide of comparison are performed. Given the cosine amplitude distribution, the required slot lengths distribution along the array is determined. For the synthesized antenna, the S-parameters, radiation and beam scanning characteristics are computed in the 8.5-9.5 GHz band. The descending towards the edges of the aperture amplitude field distribution yielded the reduced SLL and improved matching in the frequency band.

Keywords: leaky-wave antenna, complex propagation constant, rectangular waveguide, nonuniform slotted array, antenna synthesis.