| In the 21st century,military science and technology have been greatly developed.Judging from the current development trend of military technology revolution,in future wars,electronic warfare will become an important part of information warfare.Microwave and millimeter wave technology plays a vital role in electronic warfare and has been extensively studied by many scholars.However,at present,the output power of a single solid-state device decreases as the frequency increases,and it is difficult to meet application requirements in the millimeter wave frequency band.Therefore,in order to obtain high-power millimeter-wave signals,a radial power splitter/combiner,which aims to combine various power signals,has become a research hotspot.This dissertation focuses on high isolation radial power splitter/combiner,and its main work is as follows:1.Designed a compact and high isolation Ka-band five-port radial power distributor/combiner.The structure achieves broadband matching of the structure through two connected probes and two coaxial impedance transformation sections,and achieves good isolation characteristics and matching characteristics of the output port through a trapezoidal round table.When the TEM mode signal is input to the coaxial port,the circular waveguide port has no output signal,and the output signals of the three rectangular waveguide ports are equal in amplitude and in phase.This chapter expounds its working principle in detail,and simulates with simulation software,and then performs processing and testing.Finally,the test results are analyzed,and the test results show that the structure has achieved good results in the millimeter wave frequency band,has strong practical value,and achieved the initial design goals.When the circular waveguide port is connected to a matched load,in the 29-33GHz frequency band,the reflection coefficient of the three rectangular waveguide ports is greater than 14dB,and the isolation between the three rectangular waveguide ports is greater than 20dB.The reflection coefficient of the coaxial port is greater than 15dB in the 30-32GHz frequency band,and greater than 13dB in the 29.5-32.5GHz frequency band.2.Designed a high isolation radial nine-way power splitter/combiner based on the magic T structure.The radial nine-way structure realizes broadband matching of the overall structure through a ridge waveguide probe,two connected probes and two coaxial impedance transformation sections,and achieves port isolation and matching through trapezoidal truncated cones and trapezoidal cut corners.The radial nine-way structure is composed of three rectangular waveguide ports of the five-port structure in Chapter 2 connected with three identical coplanar waveguide magic T ports based on ridge waveguide probe coupling.Therefore,when a TEM mode signal is input to the coaxial port,the output signals of the six rectangular waveguide output ports of the radial nine-way structure are equal in amplitude and in phase.This chapter analyzes and discusses the radial nine-way structure in detail from theoretical analysis,design analysis,simulation analysis to experimental verification.The test results show that the structure has a good effect in the millimeter wave frequency band and has reached the initial design goal.When the circular waveguide port is connected to a matched load,in the 29-32GHz frequency band,the reflection coefficient from rectangular waveguide port 1 to rectangular waveguide port 6 is greater than 17dB,and the reflection coefficient from rectangular waveguide port 7 to rectangular waveguide port 9 is greater than 19dB.The reflection coefficient is greater than 15dB,the isolation between the same magic T output port is greater than 17dB,and the isolation between different magic T output ports is greater than 24dB.3.Designed an inverted radial six-way power divider based on the magic T structure.The inverted radial six-way power divider is composed of three rectangular waveguide ports of the five-port structure in Chapter 2 connected with three identical difference ports of the coplanar waveguide magic T based on the coupling of ridge waveguide probes.When a TEM signal is input to the coaxial port,this structure produces two radial three-way power splitters.The output signals between the two radial three-way power dividers are equal in amplitude and opposite phase,but the output signals at the internal output ports of the radial three-way power divider are equal in amplitude and in phase.This chapter presents the working principle of the inverted radial six-way power divider based on the magic T structure,and conducts simulation analysis on it.The simulation analysis results show that the structure has good broadband characteristics and isolation characteristics in the millimeter wave frequency band. |
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