A New Uniplanar Double Balanced Mixer with High Port to Port Isolation

A design of new uniplanar double balanced mixer with a high port to port isolation is presented. Through the use of novel CPW-slot double junction balun, the need for via holes and back metalization has been eliminated. Hence, this mixer can be easily adapted to monolithic integrated circuits. The mixer realized has superior characteristics in comparison to other uniplanar mixers published up to now. An operating bandwidth, characterized by more than 1:6 frequency ratio has been achieved, at up to 10 GHz, with a conversion loss of 6.0 to 8.5 dB and LO/RF isolation greater then 30 dB.