Design of an Edge Slotted Waveguide Antenna Array Based on T-Shaped Cross-Section Waveguide

Teng Li,Wenbin Dou

doi:10.1155/2017/7385357

Abstract

An edge slotted waveguide antenna array based on T-shaped cross-section radiating waveguide is proposed. The T-shaped waveguide is analyzed and designed to operate in dominant mode around the center frequency, which has a lower profile compared with the rectangular one. The radiating slots are etched and rotated alternatively on the broadened top plate without cutting into the adjacent walls. The metal fences are inserted between slots to reduce the mutual coupling and surface wave. Therefore, the sidelobe level in E-plane is well suppressed. A 2 × 8 antenna array working at Ka-band is designed and fabricated. The measured results agree well with simulations which demonstrate this novel waveguide structure.

Highlights

Slotted waveguide antenna array is a good candidate in the areas of radar and communication systems due to its attractive features, such as low power loss, low cross-polarization levels, low profile, high power capacity, high efficiency, and accurate control of amplitude and phase distributions
The slots etched on the narrow wall of the waveguide are usually cut into the adjacent broad walls [1,2,3] or folded as Z-shaped [4,5,6] to achieve the resonance
A novel edge slotted waveguide antenna array is proposed based on the T-shaped cross-section waveguide

Summary

Introduction

Slotted waveguide antenna array is a good candidate in the areas of radar and communication systems due to its attractive features, such as low power loss, low cross-polarization levels, low profile, high power capacity, high efficiency, and accurate control of amplitude and phase distributions. The slots etched on the narrow wall of the waveguide are usually cut into the adjacent broad walls [1,2,3] or folded as Z-shaped [4,5,6] to achieve the resonance. A novel edge slotted waveguide antenna array is proposed based on the T-shaped cross-section waveguide. The metal fences are inserted between slots to suppress mutual coupling and surface wave which are beneficial to improve the radiation performance. The effect of these fences on radiating slots is analyzed as well. A 2 × 8 antenna array working at 35 GHz is designed by using full wave EM simulator and validated experimentally

The Analysis of T-Shaped Waveguide

Fabrication and Measurement Results

Findings

Conclusions