Design and implementation of Slotted Waveguide Antennas with Low Sidelobe Level in X-band for High Power Application

Document Type : Original Article

Authors

Military Technical College, Cairo, Egypt.

10.21608/iugrc.2021.246356

Abstract

slotted waveguide array (SWA) antennas are popular omnidirectional microwave antennas. These antennas feature omnidirectional gain around the azimuth with horizontal polarization.it offers clear advantages in terms of their design, weight, volume, power handling, directivity, and efficiency. They are a popular antenna in navigation, radar and other high-frequency systems. For broad wall SWAs, the slot displacements from the centerline control the antenna’s side lobe level (SLL). This paper introduces a simple creative procedure for the design of broad wall SWA with a desired lower SLLs and lower reflection coefficients. The paper shows the comparison between making the slots rectangular or using elliptical slots. For a given number of longitudinal slots with equal length, width, spacing along the length of the waveguide but non uniform displacements from the centerline and showing the advantage from using equal offsets. Matlab programs with GUI is created to perform the design calculations of slots data and displacements using Chebyshev coefficient distribution. Designing an array by the column to make planner antenna with pencil beam. A prototype column of SWA has been fabricated and tested, and the results are matched with the design objectives.

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