| Millimeter wave frequency band is between microwave and infrared,and it has the characteristics of two kinds of spectrum.It has rich spectrum resources and is suitable for all-weather work.Therefore,millimeter wave system has been widely used in communication,radar,remote sensing,imaging,astronomy,electronic countermeasures and other fields.High-power amplifier is an important part of millimeter wave system,and its performance directly affects the overall performance of millimeter wave system.The main research work of this paper includes:1.The power distribution/synthesis structure based on waveguide has the advantages of high power capacity,small loss and easy heat dissipation.In this paper,an over-mode waveguide E-plane T-junction structure is designed to solve the problem of difficult processing at high frequency.The power distribution/combination structure is analyzed and verified in detail in terms of model,simulation and processing test,which proves the feasibility of the power distribution/combination structure.On this basis,combining the waveguide-microstrip conversion structure with the above E-plane T-junction mode waveguide power synthesis structure,an E-band four-way power distribution/synthesis structure is realized.The experimental results show that this four-way power distribution/synthesis structure has high synthesis efficiency.2.In order to solve the problem that the resonant mode and other modes are easy to appear in the metal cavity at high frequency,which will cause permanent damage to the system,this paper introduces an electromagnetic band gap structure formed by periodic metal pin structure in the E-band power amplifier system,which prevents the transmission of internal waves in certain frequency bands and improves the performance of the passive structure of the metal cavity.3.Two types of solid-state power amplifier modules(71GHz～76GHz and81GHz～86GHz)were designed with EBG package.Aiming at the problems of high heat consumption,natural heat dissipation difficulties and easy burning of chips,a reasonable heat dissipation channel was designed to ensure that the overall temperature of power amplifier modules would not increase significantly when they work for a long time.The measured typical synthetic power values of the two power amplifier modules are 8.5W and 7.9W,and the power added efficiency is 12.1% and 14.4% respectively.The T-junction synthesis structure of the two solid-state power amplifier modules achieves a combined efficiency of over 92%,demonstrating the excellent performance of the EBG package for e-band cavity stability.4.Aiming at the small size of metal waveguide filter in millimeter wave band,which is difficult to be processed by traditional processing technology,a W-band silicon-based cavity filter with folded path is designed in this paper,and the precision machining of silicon cavity is realized by using the emerging silicon-based micromachining technology and silicon microprocessing technology.The test results show that the insertion loss of the filter is less than 1.8d B and the return loss is better than 11 d B between 91.3GHz～97.7GHz passband.The filter structure is compact,the physical size is only 8mm*5.48mm*0.75 mm,and the consistency between batches is high,suitable for large-scale production. |
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