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.

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

The analysis of the single diode quad ring mixer incorporating broadside coupled suspended microstrip baluns and a 4-wire balanced line is presented. Design trade-offs and guidelines are presented. Practical results of multi octave, highly rugged, high performance up/down frequency converters for airborne applications are presented.

O. S. A. Tang

Papers

Design and Performance of Rugged High Performance Broadband Diode Mixers for Airborne Applications