Millimeter-Wave Series Power Combining Using Sub-Quarter-Wavelength Baluns Hyun-

Abstract

We present a new millimeter-wave power-combining technique using transmission-line baluns which both connect tran- sistor outputs in series and inductively tune the transistor output capacitances. The baluns are much shorter than a quarter-wave- length , hence are more compact and have l ess insertion loss than a balun. We introduce one topology providing an even number of series connections, including 2:1 and 4:1, and a second topology providing either an even or odd num ber of series connec- t