Abstract

This chapter describes the design and development of broadband slotted waveguide array (SWA) antenna. Conventional SWA antenna offers a few percentages of bandwidth, which can be enhanced using proposed novel differential feeding technique which electrically divides large resonating SWA into wideband subarrays by creating virtual shorts. This chapter discusses concepts to achieve broadband nature of SWA antennas, design, development, and characterization of edge fed slotted waveguide array antenna, coupling slot fed SWA antenna, and high efficiency broadband slotted waveguide array. The developed SWA antennas are characterized and their measured results are presented. The developed prototype of proposed SWA antenna demonstrates measured return loss better than −17 dB over 7.6% bandwidth and achieves 90.2% antenna efficiency. This chapter also briefs about planar broadband SWA antenna and its prototype development and characterization.

Highlights

  • Slotted waveguide array (SWA) antenna technology has been utilized by many spaceborne missions such as Radarsat-1, SIR-X, ERS-1/2, and Sentinel-1, because SWA technology has several advantages like high efficiency, good mechanical strength, high power handling capacity, and manufacturing ease

  • High efficiency broadband 10-element linear SWA integrated with differential feeding technique has been discussed in detail and compared with conventional SWAs

  • The differential feeding technique has been proposed to eliminate the drawbacks of conventional SWAs excited with edge feeding and/or coupling slots

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Summary

Introduction

Slotted waveguide array (SWA) antenna technology has been utilized by many spaceborne missions such as Radarsat-1, SIR-X, ERS-1/2, and Sentinel-1, because SWA technology has several advantages like high efficiency, good mechanical strength, high power handling capacity, and manufacturing ease. The main drawback of this technology is narrow impedance bandwidth, which limits its applications to support high resolution SAR systems for civil and military applications. The traveling wave type SWA provides wide bandwidth, but its efficiency is very low

Emerging Waveguide Technology
Subarray: conventional technique for bandwidth enhancement
Feeding mechanisms for subarray
Theory of virtual short
Design and simulation of linear slotted waveguide array antenna
Design and simulation of planar slotted waveguide array antenna
Prototype fabrication and measurement
Findings
Conclusion

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