Abstract
This paper describes the design and performance of annular slot planar arrays which generate pencil beams and monopulse tracking beams in both principal planes. These planar arrays consist of a transmission line in the form of a radial waveguide whose upper plate contains annular groups of linear slots. Monopulse operation is obtained by dividing the transmission line into four independently excited quadrants, each of which is propagating a field configuration identical to the dominant H_{01} radial waveguide mode. The antennas radiate linear polarization. In contrast with many other types of two-dimensional waveguide slot arrays, these antennas can be fabricated inexpensively. Small diameter versions possess the following electrical and mechanical advantages when compared to a dish antenna of comparable size: 1) comparable gain, 2) improved backlobe suppression, and 3) more compact size and lower weight. Designs have been developed at X band.
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