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Shortwave four power combiner design and simulation studies

Author: ZhangFengPing
Tutor: ZhangHuaiWu；PanHuaRong
School: University of Electronic Science and Technology
Course: Software Engineering
Keywords: Transmission line Power combiner Thermal Design Thermal simulation
CLC: TN73
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract


A radio transmitting apparatus , in order to ensure sufficiently far transmission distance , the transmission signal is often subject to excessive stage power amplifier until obtain a sufficiently large power is then sent to the transmitting antenna . Mostly used in modern broadband amplifier solid state amplifier technology to achieve power amplification and high-power high-power synthesis technology , high-power synthesizer become key components of radio transmitting equipment . Can be superimposed the multiple amplifier module power output power can reach several kilowatts or tens of kilowatts of continuous wave power to meet the needs of the military and civilian remote communications . Using transmission line transformer of the works in this article in detail introduced the synthesizer design and simulation process , carried out the following series of research work : 1) This paper introduces a power type magnetic materials in a transmission line transformer that played the role , as well as large power design requirements of magnetic materials , detailed study of a two-wire transmission line , the characteristic impedance of the coaxial cable design theory and design methods ; 2 ) detailed derivation 1 : -1 and 1:4 impedance transformer transmission characteristics as well as a method of improving the working frequency of the upper limit thereof , introduces a phase compensation technology , and used in ultra- wideband synthesizer design ; 3) This article successfully developed a novel short 5kW quad power combiner circuit , the circuit through the drop the two synthetic impedance and liters impedance to complete the synthesis of the four synthetic series of the simplest , shortest path of power transfer , the performance index is excellent : ~~ 30MHz operating frequency for insertion loss lt ; 0.2dB in wave lt; 1.15 , isolation gt ; to 26dB, phase inconsistencies lt ; 3 ° synthetic power of not less than 5kW continuous wave . 4) structural design using Solidworks software ; Flotherm software synthesizer Single off road cases the balancing resistor fever problem of thermal analysis , worked out using forced air-cooled heat design ; harshest and synthesizer working state thermal simulation ; designed synthesizer samples at the same time the static parameter testing and high-power load validation . The results show that the design of this article is correct , as is reasonably practicable , through the work of the above series successfully completed the study .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Power combiner
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