Ka波段宽带耦合器和功率合成器.pdf

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 14, NO. 6, JUNE 2004 295 Broadband Folded Wilkinson Power Combiner/Splitter Yi Sun and A. P. Freundorfer Abstract—A new folded Wilkinson power combiner/splitter has been realized at millimeter-wave frequency with an area that is one half that of the standard two-stage Wilkinson power combiner. The new splitter has an insertion loss of 5 dB, an isolation of 15 dB and a return loss 15 dB from 15 to 45 GHz. Index Terms—Integrated circuit design, integrated circuit layout, integrated circuits, power combiners, power dividers. I. INTRODUCTION IRECT carrier modulation has attracted considerable Dinterest by its reduced hardware complexity and cost (a) for wireless applications especially in millimeter-wave range. Work has been done on the direct modulation techniques based on balanced reflection topology using quadrature couplers with heterojunction bipolar transistors (HBTs) and pseudomor- phic-high-electron-mobility-transistor (PHEMT) as switches [1], [2]. These types of modulators (MODs) and demodulators (DEMODs) have the potential of data rates in excess of 4 Gb/s or higher [3]. An important component used in these MODs/DEMODs are the broadband couplers, combiners, and splitters. Much effort has gone into the miniaturization of the broadband couplers [4]–[6]. It is well known that multistage Wilkinson combiners/splitters have an increased bandwidth (b) of operation over the standard single stage Wilkinson power