A novel uniplanar ultra-broadband double doubly balanced mixer for high dynamic range applications

A novel uniplanar ultra-broadband double doubly balanced mixer (DDBM) is proposed for high dynamic range applications. The proposed mixer is based on three uniplanar dual baluns employing a coplanar waveguide (CPW)-to-coplanar stripline (CPS) T-junction. The proposed mixer is fabricated on a 25 mil-thick alumina substrate using a standard thin film process. The fabricated DDBM has a RF bandwidth of 1 to 26 GHz with a conversion loss ranging from 4.5 to 9.8 dB and a high third-order intercept point of 24 dBm. The measured LO-to-RF and LO-to-IF isolations are better than 14.8 dB and 16.7 dB for the LO frequency from 1 to 26 GHz.