Research On Millimeter Wave Front-end Design And Interconnection

With the increasing shortage of spectrum resources,millimeter waves are widely used in precision guidance,radar communications,satellite communications and other fields due to their advantages and the rapid development of monolithic integrated circuits.Therefore,the performance requirements of the millimeter wave system are getting higher and higher,and the improvement of the performance of the millimeter wave system mainly depends on the key components of the millimeter wave front end.This thesis mainly studies the millimeter wave front end and its interconnection technology,analyzes the millimeter wave interconnection technology based on gold wire bonding,and tests the millimeter waves low noise amplifier,waveguide and microstrip transition structure,microstrip array antenna and bandpass through simulation.The filter researched the millimeter waves front end.The thesis first analyzes its working principle through the equivalent circuit diagram of the gold wire,and simulates the influence of different parameters such as the number,diameter,height,length,spacing and bonding position of the gold wire on its transmission performance,and provides a theory for actual gold wire bonding in accordance with.Select the NC10211C-3337 chip of CETC 13 according to the requirements of the amplifier,and simulate the gain,standing wave and stability of it through simulation software,and process and test it.The measured amplifier gain is 18 d B in the working frequency band.±1d B,the input reflection coefficient is less than-10 d B,the output reflection coefficient is less than-10 d B,the noise figure is up to 2.9d B,and the input 1d B compression point is 8.9d Bm.Secondly,a microstrip probe structure is simulated to realize the transition between waveguide and microstrip.The probe structure has an insertion loss of less than 0.1d B in the operating frequency,a standing wave ratio of less than 1.2,and an in-band fluctuation of less than 0.05 d B.Then a microstrip array antenna based on parallel feeding is simulated and designed,and the standing wave ratio of the measured array antenna is less than 2 in the working frequency band.Finally,a hairpin filter is designed according to the principle of a coupled bandpass filter.The measured insertion loss of the hairpin filter in the passband is greater than 5d B,and the input reflection coefficient is less than-10 d B.The suppression of out-of-band signals is not as good as the simulation results.Based on the SIW technology,the SIW filter with two structures of microstrip line and coplanar waveguide is designed and simulated.The measured SIW filter with coplanar waveguide structure has an insertion loss of 4d B in the passband,and an input reflection coefficient of less than-15 d B.The center frequency is ±3GHz.The signal suppression at the center frequency is better than 25 d B,the insertion loss of the microstrip line structure of the SIW filter is 4.5d B in the passband,the input reflection coefficient is less than-15 d B,and the signal suppression at the center frequency of ±3GHz is better than 30dB.