KEYWORDS: Microwave radiation, Diodes, 3D modeling, Advanced distributed simulations, Electronics, Electromagnetism, Device simulation, Frequency conversion, Data conversion, Signal attenuation
A double balance mixer based on the microstrip balun is proposed in this paper. The new design is simulated and validated by the measurement. The measured results show that the typical conversion loss is 10dB from 2GHz to 20GHz, with a local oscillator (LO) power level of 12dBm. Furthermore, the return loss and the LO-to-RF isolations are better than 10dB and 20dB, respectively. Compared with the reported works, the circuit performs the best conversion loss and isolation characteristic in the wide bandwidth. In conclusion, the designed mixer exhibits an outstanding comprehensive performance.
A novel marchand balun is proposed using multilayer microstrip lines technology. The developed balun achieves he broadband operation and the blocking by introducing rectangle-shape microstrip and a U-shape microstrip coupled line in the conventional marchand balun. Meanwhile, the distribution of the electromagnetic field in the multilayer microstrip circuit has been analyzed. The measured results of the proposed balun agree well with the full-wave simulation results across the bandwidth from 20GHz to 55GHz,the insertion loss and the phase difference is better than 5dB and close to 1800,,respectively, and the circuit size is about 2.6mm *1.5mm.
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