A K-band low conversion loss single balanced mixer with GaAs Schottky barrier diode

With the rapid development of the wireless technology, mixer, which is the main part of microwave receiver, has been demanded to be much more smaller and better performance. A low conversion loss k-band single balanced mixer is presented in this paper. The radio frequency (RF) signal and local oscillator (LO) signal are applied to one pair of mutually isolated ports of the 180-degree hybrid ring, after calculating the embedding impedance of the diodes in harmonic balance method, an input matching network is designed, then the intermediate frequency (IF) will be taken to the output port through the compact low pass microstrip filter. The circuit is fabricated on the Rogers 3003 substrate with dielectric constant of 3, thickness of 0.254mm using two MAE1310 Schottky diodes.