Microwave Broadband Power Synthesis Technology Research

High power broadband power combine amplifer are a crucial element for a variety of defense electronics systems. However, the power amplifier bandwidth is wider, the less the output power. High power, broadband has become a hot and difficult research topic in today’s microwave power technology.This dissertation focuses on these problems, has mainly investigated microwave broadband power combiner technique, the main contents:Firstly, analysis some theories to be considered in the microwave solid state power combiner design, such as loss, band, MMIC application, thermal analysis etc., lay the theoretical basis for the study of broadband technology.Then, a Wilkinson power divider is presented based on the taper of the empirical formula branches, designed and realized by odd and even mode and the minimum reflectivity theory. The results showed that insert loss less than3.3dB, input and output return loss better than16dB,22dB, respectively, and isolation between the outputs better than16dB, in the band of18GHz-27GH. In band of2GHz-8GHz, input and output return loss better than15dB,10dB, respectively, and isolation between the outputs better than10dB, insert loss less than3.23dB. The power splitter is a simple structure, small insertion loss, wide bandwidth, can be an effective solution to the multi-way combine network difficult to integrate.A coaxial ridged waveguide power divider is also designed. By using transmission line theory and electromagnetic field simulation software design. Analysis results showed the input return loss better than20dB and consistency of phase between outputs. The divider exploratory to solve the problem of bandwidth is difficult to break in the SSPA technology.A K-band broadband power combiner is realized by using hybrid power combine technology, which is comprised of Wilkinson power divider and waveguide E-plane micro-strip probe structure. In the band of18GHz-27GHz, test results show the gain is41.5-47.5dB, the P1dB is greater than6.76W and the highest is8.9W at23GHz, the lowest combine efficiency is79.44%in the band of18-25GHz. The combiner also has two properties of the broadband and high power. Moreover, it first time realized high power output in the entire K-band, which has important reference and application value to broadband power combining technology.