Experimental investigations of CPW-slotline transitions for uniplanar microwave integrated circuits

Eight novel coplanar waveguide (CPW) to slotline transitions using uniform and nonuniform CPWs or slotlines are discussed. These transitions are uniplanar and simple to fabricate. No via-holes are needed for ground connections, and integration with solid-state devices is easy. A pair of broadband transitions using CPW shorts and slotline radial stubs is demonstrated with a 1-dB bandwidth of more than 5.2:1.<>