A broadband planar monolithic ring mixer

Abstract

This paper reports the development of a mixer having RF and LO bands of 3 to 11 GHz and an overlapping IF of 1 to 11 GHz. This was achieved through the use of novel planar spiral RF and LO baluns and a new type of four-wire IF balun. We believe that this is the broadest-bandwidth planar monolithic mixer having an overlapped IF reported to date.