A Wideband Vivaldi Array With Enhanced Power Handling Capacity

This paper proposes an all‐metal Vivaldi array based on the tight coupling effect with enhanced power handling capacity (PHC). To achieve this, L29 connectors and enlarged parallel‐plate waveguides are strategically implemented to reduce localized electric field intensity. By optimizing the reflective cavity dimensions, half‐wavelength resonance within the operational bandwidth is effectively suppressed. Furthermore, extending the arms of edge elements mitigates the E‐plane truncation effect. The designed array demonstrates an active voltage standing wave ratio (VSWR) below 2 across 0.55–4.17 GHz and below 3 within 0.53–4.15 GHz while scanning up to 45° in both E‐ and H‐planes. A prototype 8 × 10 array (370 × 240 mm) was fabricated and tested, achieving a PHC of ≥ 10.1 MW at broadside and ≥ 7.25 MW at 45° scan angles. Measured results align closely with simulations, validating the design’s robustness for high‐power microwave (HPM) applications.