Design of Ridge Waveguide Array Antenna for Radar

Shared-Aperture 24–28 GHz Waveguide Antenna Array

“…Antenna array concepts established for 5G operation in microwave-frequency bands use several types of elements, such as a planar dipole [10,11], patch [12,13] and Vivaldi [14,15] structures, substrate integrated waveguide (SIW) [16][17][18], and slotted [19] and horn (including various ridges) [20][21][22][23] waveguides. The elements based on the planar dipole, patch and Vivaldi structures, and SIW are easy to manufacture and integrate with other planar microwave circuits; however, they may exhibit higher losses since their metallic structures are supported by a dielectric substrate.…”

“…A Γ probe, which requires the stacking of three substrates, is necessary for a transition between an excitation SIW and radiating horn waveguide in [21], and a triangular extension of the substrate has to be employed for the same transition in [22]. An array based on an element of similar construction using the H waveguide is employed in [23]; however, the bandwidth is narrow (2.7%) compared to the proposed array (>25%). The main contribution of this paper is as follows:…”