Slotted Waveguide Frequency-Scanned Slow-Wave Antenna With Reduced Sensitivity of the Closed Stopband at Millimeter-Wave Frequencies

In this paper, we describe the design and implementation of a frequency-scanned slotted waveguide antenna with a closed stopband which has a low sensitivity to the fabrication errors. The antenna is implemented as a slotted slow-wave waveguide by loading a standard WR22 waveguide with elliptical posts. A systematic design approach for scanning through broadside and closing the stopband with a reduced sensitivity to fabrication tolerances is discussed in the paper. This approach allows for fabricating the antenna using CNC machining with a tolerance of &#x002B;/&#x2212;0.13 mm for the waveguide and a tolerance of &#x002B;/&#x2212;0.05 mm for the posts. The antenna beam can be steered from &#x2212;38&#x00B0; to &#x002B;27&#x00B0; by changing the frequency from 27 GHz to 34.7 GHz. The effective radiating length of the antenna is <inline-formula> <tex-math notation="LaTeX">$27.6\lambda $ </tex-math></inline-formula> corresponding to a 1.75&#x00B0; half-power beamwidth while its radiation efficiency changes between 54&#x0025; and 90&#x0025; throughout the steering range.

Abstract licence: CC BY-NC-ND

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