Balun design for uniplanar broad band

A novel balm based on an asymmetric coplanar waveguide with
fuute gxouud plane (ASYCPWFGP) to coplanar strip (CPS)
transition is presented. A xetum loss better than 16dB is obtained
up to  5OGHz.丁he baluns  are combined w2th four silicon
Schottky barrier crossover diodes to yield a planar double-
balanced mixer (DBM) which demonstrates an ultra-broadband
performance up to 40GHz.