A Novel X-band Multiplier

With the development of radio communication technology,frequency synthesis technology is more and more widely used in radar guidance and communication equipment.In frequency synthesis technology,frequency doubling technology is a common application technology that can realize high stability and low noise frequency synthesizer.The performance of the multiplier link can also directly affect the signal quality of the frequency synthesizer,thus affecting the performance of radar communication.The demand for miniaturized and miniaturized frequency synthesizing devices is becoming more and more urgent on the market today.This paper designs a novel X-band frequency multiplication link,which is cascaded by two-stage frequency multiplication link.The research,design and implementation of the two-stage frequency multiplier circuit are the focus of this paper.The link has a small size and low phase noise.The subject is based on the technical requirements of 70 times of frequency multiplication,and the two-stage frequency multiplication link 7×10 is selected to be cascaded,which is realized by diode stack type frequency multiplication mode and nonlinear transmission line NLTL frequency multiplication mode.The stacked-multiplier of the tube stack mainly utilizes the switching effect of the diode to generate a square wave signal at the load end to realize odd-time multiplication.The diode stack type frequency multiplication mode has the advantages of simple circuit structure,small size,easy integration,easy debugging,good frequency expansion,suppression of even harmonic generation,and extremely low additional phase noise,which is suitable for low-order odd-time multiplication.The nonlinear transmission line NLTL frequency doubling technique is a frequency doubling method that realizes high-order doubling by performing pulse compression using the transmission characteristics of soliton waves to generate ultra-narrow pulses.The NLTL is a periodic loaded reverse biased diode that constitutes a coplanar waveguide.The junction capacitance of the diode changes with the applied bias voltage,causing a nonlinear wave transmission effect.This multiplier method enables any multiple doubling of the input signal.It has a higher cutoff frequency and smaller additional phase noise,and is easy to integrate.It can be applied to various high speed,wideband systems such as picosecond resolution.Sampling circuits,microwaves,and millimeter-wave signal sources are often key components of the extended frequency band in instrumentation.The innovation of this design is that the frequency doubling method of the non-linear transmission line is usually used in the MMIC process.The subject uses a separate device to simulate the MMIC to complete the frequency doubling.It has references and references in the research and use of the frequency doubling method of the non-linear transmission line.Role;using non-uniform non-linear transmission line soliton waves to achieve high-order pulse compression and harmonic generation;in order to reduce the volume and reduce the number of NLTL stages,the last stage is a π-type topology with a Schottky diode in series Way to compensate,to further separate the soliton waves on the non-linear transmission line,to achieve the result of high frequency doubling;in the three-cavity microstrip ring filter,each cavity is further added with a low-impedance open circuit,and so on.The effect of the effective capacitor is equivalent to the effect of loading a capacitor in a waveguide cavity filter.The passband frequency of a three-cavity filter of the same size can be lower,which can reduce the circuit size.From the perspective of designing X-band multi-frequency link,this paper focuses on the theoretical basis of diode stack frequency doubling technology and nonlinear transmission line NLTL frequency doubling technology,and designs and implements the frequency doubling achieved by using these two frequency doubling technologies.The actual circuit of the link and associated filters and amplifiers,and the process and results of circuit simulation and performance testing are given.