Research On Millimeter Wave Frequency Multiplier And Amplification Module

In recent years,with the increasing demands of modernized military wars for informatized electronic warfare,millimeter-wave technology has become the focus of the research of various military powers,and has played a pivotal role in modern warfare.In the millimeter wave electronic system,the millimeter wave frequency source is the core and key of the research in this frequency band.Among them,the use of frequency doubling technology to extend the microwave signal of the low frequency band to the millimeter wave signal of the high frequency band is one of the core technologies for developing the millimeter wave frequency source.The millimeter-wave frequency doubling amplification module studied in this thesis is part of the RF terahertz composite system,including a W-band six-frequency filter amplification module and a Ka-band quadruple-frequency filter amplification module.The W-band six-frequency filter amplification module provides a local oscillator source for the terahertz up-and-down converter in the RF terahertz composite system,and the Ka-band quadruple-frequency filter amplification module provides an input signal for the terahertz upconverter in the RF terahertz composite system.This thesis firstly introduces and analyzes the characteristics of millimeter-wave circuits and the common effective methods for developing millimeter-wave frequency sources.In combination with the common multi-frequency methods of millimeter waves and millimeter-wave frequency multipliers and power amplifiers in recent years,Sexual summary.On this basis,combined with the requirements and implementation conditions of the subject,the basic design schemes of the above two millimeter wave frequency doubling filtering amplifier circuits are determined,and the indicators of each part of the module are allocated reasonably,and through the electromagnetic simulation software HFSSH and ADS co-simulation,The whole circuit was designed and simulated,and a W-band six-frequency filter amplification module and a Ka-band quadruple-frequency filter amplification module were successfully researched and fabricated.Among them,regarding the W-band six-frequency filter amplification module,a two-stage frequency cascading cascade method is adopted to realize six times frequency multiplication,and after each stage frequency multiplication,the obtained signals all suppress the harmonic components through the microstrip band-pass filter.The Ku-band signal is finally multiplied to the W-band.Considering that the latter stage is passive frequency doubling,the frequency doubling loss is relatively large,and the millimeter band filter and the microstrip to band transition have higher insertion loss,so that the power loss of the entire link signal is large,so the obtained W band The signal is then amplified in two stages and finally output from the microstrip to the fin line of the waveguide.Regarding the Ka-band quadruple-frequency filter amplification module,the C-band signal input is fed by the SMA connector,and the active quadrature frequency is directly used,and the micro-band filter and the microstrip-to-waveguide fin line transition output are obtained to obtain the Ka-band signal..Since the tiny size of the circuit will have a large influence on the circuit performance in the millimeter wave band,the dimensional accuracy of the microstrip circuit in the module is required to be high.Finally,the circuit module of the design is assembled and debugged.The test results show that the W-band six-frequency filter amplification module has an input frequency of f_in GHz and an input power of+3dBm,the output frequency is 6f_in GHz,and the output power is 15.84dBm.The Ka-band quadruple-frequency amplification module has an output frequency range of4(f_{in 1}?0.125)GHz,and the output power of the module is affected by the input power.When the input power varies from-17dBm to-8dBm in steps of 1dBm,the output power has the same trend in the output frequency band.Under the action of a large excitation signal,the module will have a resonance point at the center output frequency point,and as the input power increases,the resonance phenomenon at the frequency point becomes more obvious.Due to the requirements of specific indicators,the module needs to be excited by small signals below-13dBm.Therefore,within this input power range,the self-excitation of the module at the center output frequency is not obvious and can work normally.In addition,at the same output frequency,the output power of the module varies nonlinearly with the increase of input power.When the input power reaches-12dBm,the output power of the module tends to be saturated.The experimental results show that the module suppresses the third harmonic by more than 32dBc and the fifth harmonic suppression by more than 50dBc.