Research On High Performance Wideband Anti-jamming Receive Front-end Technology

With the development of wireless technology,wireless devices are widely used in our lives.These devices emit electromagnetic waves of various frequencies into space,causing mutual interference between devices.With the increase of wireless devices,The situation is getting worse,causing "electromagnetic pollution".Especially in electronic warfare such as electronic countermeasures,the enemy generally intentionally releases strong interference signals to cause paralysis in our communications system,which may cause permanent damage in severe cases.In order to avoid the appearance of the above situation,this paper develops a high performance wideband anti-jamming receiving front-end system with high sensitivity and large dynamic range based on the broadband high-temperature superconducting receiving front-end structure.The system maximizes the anti-jamming capability of the receiving front-end,and it has extraordinary significance in civil and military applications.The main content of this article includes:1.Research on anti-jamming receiving front-end technology.The anti-interference performance of the conventional receiving front-end and broadband high-temperature superconducting receiving front-end is studied,and the final system design scheme is proposed and the indexes are refined.2.Research on high-temperature superconductor limiter.Based on the microwave nonlinear mechanism of high-temperature superconducting thin films,a step-impedance low-pass filter structure is used to design a broadband high-temperature superconductor limiter that satisfies the anti-jamming criteria,and simulations are performed using electromagnetic simulation software ADS and HFSS to complete the circuit.Packaging and testing.3.Cryogenic Low-Noise Amplifiers technology research.Analyze the matching technology and broadband technology of Cryogenic Low-Noise Amplifiers,select E-pHEMT ultra-low noise MMIC amplifier chip PSA4-5043,design a Cryogenic Wideband Low-Noise Amplifiers circuit that meets the anti-interference criteria,and use ADS The software provides a co-simulation method for accurate simulation,and finally encapsulates and tests the designed circuit.4.The use of discrete components cascaded to form a receiving front-end system,completed system debugging,and tested and analyzed system indicators,and proposed improvements to the inadequacies.The experimental data at 77K indicates that the front-end broadband high-temperature superconducting limiter in the designed front-end system has extremely low transmission loss(less than 0.1dB)and high linearity in the wide frequency range of 30MHz to 3GHz,and it is The anti-overload and anti-burnout protection of the receiving system ensures the high sensitivity and large dynamic range design of the system.The designed Cryogenic Wideband Low-Noise Amplifiers realizes ultra-low noise and greater than lOdB gain and output 1dB compression point power greater than 20dB in the wide frequency range of 30MHz-3GHz,realizing the system’s high sensitivity and large dynamic range design.After testing,the receiving front-end system designed in this paper has a gain of more than 10dB,an input reflection of less than-10dB,a noise figure of less than 1dB,an output 1dB compression point power of more than 20dBm,and an anti-burnout power of more than 30dBm at operating frequency bands of 30MHz-3 GHz and 77K.In summary,the wideband receiver front-end composed of broadband high-temperature superconductor limiter and Cryogenic Wideband Low-Noise Amplifiers has high sensitivity and large dynamic range,which improves the anti-jamming performance of the receiver front-end and further studies the anti-jamming receiver front-end.And the application has a certain significance.