Patent ID: 7027795

Claim:
A mixer for mixing an RF input signal with a local oscillator signal to provide an intermediate frequency signal, comprising: (a) a plurality of planar layers, the layers located adjacent each other and including a top layer, a bottom layer and inner layers; (b) a plurality of vias interconnecting the layers; (c) a plurality of circuit lines located on the inner layers and connected to the vias; (d) a plurality of diodes mounted to the top layer and electrically connected to the vias; (e) a first balun located on the inner layers and electrically connected to the vias, the first balun connected to the local oscillator signal; and (f) a second balun located on the inner layers and electrically connected to the vias, the second balun connected to the intermediate frequency signal and the first balun connected to the second balun; and (g) a third balun located on the inner layers and electrically connected to the vias, the third balun connected to the RF input signal and the diodes being connected between the second balun and the third balun.