The Development Of 100-110 Ghz Frequency Multiplier

The millimeter-wave plays an important role in the electromagnetic spectrum. The research about millimeter-wave is in the cross field of microwave technology and light-wave technology. Millimeter-wave has a great scientific value and application prospect in fields of medical, astronomy, satellite communication and radars.Generally, there are two ways to realize millimeter wave source with solid-state circuits:oscillating and frequency multiplying. Among these two methods, frequency multiplying is usually preferred to generate millimeter-wave signals for its better signal stability, lower master oscillator frequency, wider operating frequency band and deeper modulation depth. In this dissertation, I researched the100-110GHz frequency multiplying technology, and I designed, simulated, fabricated and tested one multiplier. Since millimeter wave with a wavelength of3mm lies in the atmospheric window frequency band, the research in this dissertation would overcome the drawback of high atmospheric transmission loss of ordinary millimeter wave. This multiplier adopts the unbalance-balance structure based on the input finline matching network, output suspended-stripline matching network, bias-filtering network and Schottky barrier diodes. Thus, this multiplier has higher ports isolations, and the matching networks are more convenient to be simulated separately. Besides, the input filter and the output filter can be dismissed because of the orthogonality of electromagnetic fields between input odd mode and output even mode of the frequency multiplier realized with balanced structure. Therefore, the multiplying circuits could be simplified and the multiplying loss introduced by the filters could be reduced. The bilateral dual finline is creatively adopted as the input matching network to reduce the inconsistency between input and output transmission lines, thus to enhance the multiplying efficiency. U-band signal is incident into the standard waveguide WR19, and the2nd harmonic is fed out through standard waveguide WR10. To further enhance the output power in100-110GHz, an amplifying module in100-110GHz is designed and fabricated in this thesis.Measured results show that in the frequency range of100-110GHz, a multiplying loss of12.9is acquired at102GHz, and the average loss is16.69dB. The multiplier has a good abstinence for fundamental-wave signal. The amplifying module could successfully amplify the signal power in100-110GHz and the best output power of7.65dBm could be acquired. At present, there are a few publications about using solid-state multiplier to acquire millimeter-wave signal over100GHz. Therefore, the research in this thesis will make contributions and promotions in realizing millimeter-wave signal source.