Abstract: In this paper, a 4 × 4 wideband linearly polarization (LP) antenna array is proposed by using planar dual-arm spiral structures. Wideband balun structures, composed of microstrip line-fed ...
Abstract: This letter introduces a novel subarray-configuration method of n × m spiral sequential rotation (SSR) to achieve low cross-polarization level (XPL) and low sidelobe level (SLL) over wide ...
Two Indian astronomers have used data from Nasa’s James Webb Space Telescope (JWST) to discover an ancient and massive galaxy with two well-defined spiral arms that appears to challenge standard ideas ...
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