Abstract
In this paper, a dual-ridge gap waveguide (DRGW) based antenna with beam scanning, sum-difference beam, and flat top beam capabilities has been proposed. The proposed antenna is composed of a gap waveguide (GW) with two flared horn-shaped ridges. A metallic plane with the same horn shape as the ridge is inserted between two ridges and extended beyond the waveguide. Two coaxial probes are located on the top and bottom plates of the GW, respectively, to excite the antenna. By independently adjusting the magnitudes and phases of two signals fed into the antenna, the patterns including the beam scanning from θ=60∘ to θ=120∘ in E plane, the sum and difference beams at the endfire direction, and the flat top beam can be flexibly achieved. Measured results are given to demonstrate that the proposed antenna operates in a band of 16.3 18.4 GHz with the average gain about 11 dBi and the front-to-back ratio (FTBR) better than 20 dB for the beam scanning, the sum beam and the flat top beam, and the null depth better than 25 dB for the difference beam.
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