A 24-GHz CMOS Butler Matrix MMIC for multi-beam smart antenna systems

Editors' Choice—Review—Semiconductor Integrated Radar for Sensing Applications

“…Besides this work, it should be pointed out that the BM MMICs designed with different order or operating frequencies can be also found in other literatures. [29][30][31] There are numerous applications that require two-dimensional (2-D) radar coverage, such as air defense, surveillance, positioning or imaging. Accordingly, a phased array with 2-D beam scanning capability is essentially in need.…”