Development Of C-band Miniaturized T/R Module Based On LTCC

Active phased array radar is the core development direction of modern militarized information field.As the most critical component of radar,the transceiver front end directly affects the technical index and cost of the whole radar system.LTCC has the huge advantage of 3D integration,so the research of miniaturized transceiver module based on LTCC technology is of great academic and application significance.Firstly,according to the application background requirements of the existing C-band phased array radar,this thesis proposes the system index requirements of C-band transceiver components and studies the basic technological process and technical specifications of LTCC.Then,the thesis analyzes the basic architecture of existing phased array radar transceiver module and designs the system architecture with compact structrue and strong anti-interference based on Common-Leg,which combines the complex electronmagnetic environment of C-band and the requirement for system miniaturization.Finally,the link noise coefficient cascade formula is also used to complete the link index allocation for the receiver branch and give the main technical index requirements? in the transmitter branch,the maximum output power of the transmitter branch is mainly considered,and the gain allocation of the driver amplifier and power amplifier is completed.This thesis focuses on the design of C-band miniaturized filter.By combining the LTCC technology background and comb filter principle,a design method of LTCC resonator with miniaturization and high Q value is proposed,then the cross coupling structure of the filter is analyzed and designed.A hign out-of-band suppression bandpass filter is successfully developed by discussing the controling method of transmission zero.The filter is compact and suitable for miniaturized transceiver systems.Then,this thesis completes solid-state active circuit index of the system analysis and selection according to the system plan,in order to ensure the receiving channel noise coefficient,this thesis studies the low noise amplifier theory,analyes the low noise amplifier design process and developed a C-band low noise amplifier of low noise and high gain through the input and output matching network design optimization method.At the end of this thesis,by analyzing the TRM internal discrete component interconnection(right-angle bend,wire bonding,stripline microstrip lines)discontinuity problems,and establishing the equivalent circuit model of calculating transmission characteristics and 3D electromagnetic simulation software to build the simulation model validation,analyzing the causes of discontinuity,optimizing the physical size,add grounding hole and chamfering methods,this thesis effectively improve the discontinuity of the transition structure,and finally completes the development of the C-band miniaturized transceiver module.According to the measured results,the received transceiver module developed in this thesis can achieve 21.6d B receiving gain within the working bandwidth of 5.1 5.8GHz,the noise coefficient of the receiving channel is better than 4d B,the four-displacement phase and six-bit attenuation are adopted,the phase-shifting accuracy RMS is better than2°,the amplitude modulation accuracy RMS is better than 0.4d B,the maximum output power is greater than 25 d Bm,and the component volume is 20mm×20mm×5mm,and all experiment results meet system specifications.