Fig. 1. The circuit topology of the proposed sub-harmonic mixer

Fig. 2. Simulated S parameters of the proposed diplexer

Fig. 3. The proposed RF band pass filter (a) Geometry view, (b) Simulated S parameters

Fig. 4. Photograph of the fabricated sub-harmonic mixer

Fig. 5. Measured conversion loss versus RF frequency at different IF frequencies (a) USB at IF of 1 GHz and 6 GHz (b) USB and LSB at IF of 1 GHz

Fig. 6. Measured USB conversion loss versus IF frequency at different LO frequencies (a) Down-conversion (b) Up-conversion

Fig. 7. Measurement results of LO-to-RF and LO-to-IF isolations as a function of LO frequency