Abstract: A new uniplanar CPW-slotline double junction balun has been proposed. Being realized as uniplanar equivalent of the microstrip-slotline double junction transition, this balun is well suited for MMIC's, and has better characteristics than other uniplanar baluns published up to now. Measured VSWR is less than 1.6 and insertion loss is about 0.7 dB for bandwidth ratio 1:6.
Key words: Balun, microstrip, VSWR, Marchand balun, CPW slotlie, MMIC.