Technology Of EHF-band Power Combining

With wide using of millimeter waves system in electronics,higher requirement is addressed on millimeter waves power amplifier. The focus is the efficient power combining technology in high frequency domain. In this paper, an efficient EHF power combining amplifier is designed and developed, with 2GHz operational bandwidth and output power higher than 10 W.In this paper, basic implementation method and key technologies involved in the millimeter waves power combining amplifier is analyzed and studied. And the detailed design and simulation processes of the key components of EHF-band power combining amplifier is given. The main contents are as the following:1) Introduce several millimeter waves power combining solutions commonly used and make detailed analysis and comparison in terms of their advantages and disadvantages. Provide comprehensive analysis on the technical scheme of EHF-band power combining amplifier, and discuss the justification of main technical specifications.2) Design waveguide-microstrip conversion, and simulate several waveguide microstrip conversion modes commonly used and analyze their advantages/ disadvantages. Eventually determine the microstrip probe transition technique is used to realize EHF-band waveguide microstrip conversion. At the same time, the capacitance compensation design is adopted against the inductive effect of the gold wire bonding, greatly improving the RF performance of the gold wire bonding.3) Design efficient EHF-band combining network. Detailed simulation and computation are provided for EHF-band radial power combining technology and odd-way power synthesis based on a resynthesizing technique, comparing their advantages and disadvantages, finally the odd-way power synthesis technique is adopted. The fabrication and test are made on a six-way power combining network in EHF band. The results show good performance in terms of return loss and amplitude-phase consistency within the range of 43.5G-45.5G.(4)Analyze the effects of circuit loss and amplitude-phase consistency on power combining and propose several effective methods to control amplitude-phase consistency. Eventually a 10 W power amplifiers in EHF-band is developed and tested. It has the output power higher than 10 W and gain more than 53 dB in 43.5G-45.5G GHz band, meeting the design requirements.