Ka-band Harmonic Amplifier Module

The dissertation is a part of "millimeter-wave front-end of 'LMDS'", which is the beforehand researchful item of the Electronic 10th Institute of Ministry of information Industry . The purpose is to escalate the centimeter-wave signal to Ka-Band trough multiplier and attain conversion gain . The dissertation is mainly on the theory and design of the frequency doubler-power amplifier sets of Ka-band.In the passive circuit, we analyzed the characteristic of microstrip and coupled microstrip. At the same time, we analyzed the basal theory of waveguide to microstrip probe transition. Then, using HP ADS software, we optimized and designed two filter-parallel coupled filter and interdigital filter. Finally, ,we analyzed and compared these filters. For waveguide-to-microstrip probe transition, We constructed model using the electromagnetic CAD software-HP ADS and designed it, then analyzed it.In active section, the fundamentals of FET and HEMT that are used as multipliers were analyzed. On the basis, we designed multiplier/amplifier circuits, respectively. In microwave section, we used FET and designed a multiplier and an amplifier. At first, we set up models using software-HP ADS, optimized and simulated the models using harmonic balance method. The results of simulation and experiment were obtained good consistence . In millimeter wave section, a multiplier/amplifier module was set up ,and realized the effective conversion gain.At last, according to the upper result of simulations and designs, we designed and fabricated the frequency doubler-power amplifier sets of Ka-band. The modules include six parts: a centimeter wave signal, which power is 4 dBm and frequency is 3.4 GHz , was multiplied by FET. And then it was filtered and amplified by FET. Finally, we get a signal of 6.8 GHz. After that, the signal was quadrupled, filtered and amplified again ,which used HMMC 5040. The frequency and power of output signal is 27.2 GHz and 20.37dBm, respectively.The experimental result expresses that the frequency doubler-power amplifier sets of Ka-band can supply good local oscillation source for "millimeter-wave front-end of 'LMDS'". The model has the advantages of low cost, small size and high reliability.