Study On W-Band Power Combining Technology

The power divider / combiner has become the key components of power amplifier which consists in modern radar and communication transmission systems. In order to be flexible with the MMIC amplifier cascade match, to achieve integration on chip and wideband high output power, a W-band chip-based power combiner was developed in this thesis, the main reseach contents and results are as follows:The development and application of W-band power combination technology were introduced. The characteristics of microstrip line, coplanar waveguide, and the waveguide were described in detail. Simulation analysis of the branch-line-hybrid,Wilkinson power divider and some special transition structures were done. The W-band power combination principle and typical power division / combination framework were studied, then the electromagnetic simulation software ADS, HFSS were applied to W-band two-way power combination network. Finally, a two-way Wilkinson power divider / combiner on quartz chip was fabricated(chip size:2.54×3.97mm). According to test results, at the center frequency 110 GHz, S parameters of power division/combination network are S21=-2.29 d B、S11=-21.93 d B, In the 107 GHz ~ 112 GHz, S11 <-15 d B. According to the equivalent circuit model parameters of MMIC amplifier chip, simulation and optimization of Wilkinson power divider / combiner chip cascaded with the two MMIC amplifier chips were made, besides, capacitors and resistors of two MMIC amplifier chips biasing circuit layout were designed and optimized reasonably. An integrated, miniaturized W-band two-way power combining amplifier chip on Mo Cu substrate(size:8.85×6.55mm) is made for the first time. At 95 GHz, power output achieves 300 m W, synthesis efficiency is 83.74%. At 106 GHz, power output achieved 202 m W, synthesis efficiency is 78.33%. The test results are in good agreement with simulation results, which confirmed the feasibility and correctness of the design. The same design methods applied herein for the modeling and simulation of a four-way power divider / combiner network(at the center frequency of 95GHz).On-chip W-band power dividers were developed in this design, and can be batch manufactured by use of microelectronics production line with small size, and low-cost advantages, which lays the foundation of developing a new generation of compact, efficient millimeter-wave radars and communication systems.