Research And Design Of 0.3-18GHz Miniaturized Ultra-wideband Receiver

With the rapid development of microwave communication system,the requirements for equipment in the field of electronic countermeasures are constantly developing towards the direction of small size,ultra-broadband and integration.As a key part of modern electronic warfare communication system,it is very important to study the receiver deeply.In this paper,the superheterodyne secondary frequency conversion scheme is adopted.Based on multi-function chip switching filter bank and multi-chip micro-assembly technology(MCM),the microwave single chip integrated circuit(MMIC)is used to realize the compact integration and interconnection of circuits.In terms of structure,the integrated module design is adopted to complete the low-cost design of 0.3-18 GHz miniaturized UWB receiver.Firstly,the development trend of miniaturized UWB receiver is fully investigated and analyzed in this paper,and the microwave multilayer and multi-chip module technologies,as well as the common structure and key index parameters of the receiver are mainly introduced.In this paper,the system scheme of the receiver is analyzed in detail,and frequency planning,RF link design and if link design of the 0.3-18 GHz miniaturized UWB receiver are carried out according to the scheme index requirements,and the system key index performance is simulated and verified by ADS.Secondly,the key components of the designed ultra-wideband receiver are selected and analyzed.Among them,the chip mainly selects the MMIC chip,and the passive circuit part is analyzed and simulated.The specific content of the passive circuit design part is as follows:the miniaturization design of the passive filter part and the analysis of the gold wire bonding characteristics.IF high-selectivity band-pass filter part,this paper is based on hairpin stepped impedance resonator(SIR)and laminated substrate integrated waveguide(SIW)technology.After optimized simulation analysis,the filter passband return loss is finally designed.Less than-15 d B,and the band interpolation loss is greater than-3d B,which not only realizes the high selectivity of the filter but also reduces the area of the filter by nearly 40%.Through the simulation analysis of the bonding characteristics of the gold wire,the influence of the arch height,span,diameter,distance between adjacent gold wires and the number of the bonding alloy wire on the transmission performance is determined.Finally,the three parts of the receiver's radio frequency channel,power control and cavity are designed as an integrated structure.The interconnection assembly between the microwave transmission line and the microwave monolithic integrated circuit is completed through the micro-assembly technology,and the miniaturization design of the 0.3-18 GHz ultra-wideband receiver is finally completed.The size of the whole machine is 10cm×6.1cm×1.1cm.After processing and testing,the final system gain is 20-70 d B with a dynamic range of 50 d B,the noise figure of the system is less than 6d B,the harmonic suppression is greater than 50 d Bc,and the input VSWR is less than 2.2,which meets the system index performance.