.8 Mm Power Integrated Circuits

The successful application and development of millimeter-wave solid-state system are greatly determined by the system output power. The approach of power combing is an effective solution for greater output power, when restricted by the output of single device.The multilevel binary power combing technique based on 3-dB hybrid have experienced heavily development, because of the development of technique the millimeter-wave devices have endured, because of the mature of millimeter-wave monolithic integrated circuits which make the circuits fabricated more easily and cost effectively, and because of the design of low loss 3-dB hybrid which is key to improve the combing efficiency. Under the presently conditions, we have designed a low loss 3-dB three port network available in power combing or dividing. Since without resistive material, it is different from conventional 3-dB Wilkinson hybrid and can fabricated on soft substrate, so simplify technology of circuit fabrication. In 32GHz~37GHz, the insert loss is about 0.2dB.In the millimeter-wave system which chiefly using waveguide as transmission line, the transition between waveguide and microstrip is absolutely necessarily. It's most important performance is low insertion loss and facility of realization. Utilizing ridge waveguide we have designed a waveguide-microstrip transition, in 32GHz~37GHz frequency range, which have a loss less than 0.2dB. Furthermore, it deserves more attention for easily fabrication process, very good firmness, and the input and the output lying in a line to meet the particular requirement.Finally, using the low loss 3-dB three port network as power dividing and combing network and using HMMC 5040s fabricated by Agilent co. as single-way amplifiers, with the help of E-plane waveguide to microstrip transition, we have designed a two-way power combing circuit with waveguide as interface ports. In 33GHz~35GHz,the measured saturated output power is about 170mW, and the combing efficiency estimated is greater 70%. The results indicate that our scheme is practical and feasible and it will obtain efficiency greater than 80% with the improvement of fabricating technology. The realization of highly efficient two-way power combing is the firm basement of multilevel combing for greater output power.