Abstract: This article reports the recent progress in active and passive retrodirective arrays using phase-conjugation techniques. The arrays presented here are designed for wireless communications in ...

Abstract: The theory, design, fabrication, and measurement of a new class of planar ultrawideband modular antenna (PUMA) arrays are presented. The proposed PUMA array class achieves twice the ...

Note: If you are using leetcode.cn, you can just ignore this section. Recently we observed that the extension cannot login to leetcode.com endpoint anymore. The root cause of this issue is that ...

Attributes like Difficulty, Acceptance %, Frequency % are also added to enable filtering. This repository contains the snapshot as of 21st Feb 2026. If you need to sort/filter the questions based on ...