Analysis And Design Of Environmental Electromagnetic Monitoring System Based On Planar Spiral Antenna

With the popularization of wireless communication,large quantities of electromagnetic devices are widely used in daily life,forming a complex electromagnetic environment with various styles,dense overlap and dynamic overlap.Considering the complexity and diversity of environmental electromagnetic signals in space,time domain,frequency domain and energy,this paper makes full use of planar spiral antenna technology,artificial intelligence technology and interactive design software technology based on the analysis of domestic and foreign environmental electromagnetic signal monitoring technology Based on the latest research achievements in the field,the effective combination of electromagnetic signal receiver,antenna sensor and main control software is realized,and a portable broadband environment monitor and its corresponding system software are developed.The main research contents and innovations of this paper are as follows:1.A low profile slot spiral antenna with a volume of 300mm × 300mm× 30mm is designed for the signal acquisition sensor,which is the key problem of environmental electromagnetic monitoring instrument,and its physical processing test is carried out In the range of 6GHz,the return loss is less than-l0dB,the axial ratio is less than 3dB,the gain is high in the whole frequency band,the directivity of the pattern is good,and there is no split phenomenon.2.In order to improve the portability of the monitor,a composite spiral antenna is designed to reduce the volume of the sensor to 280mm × 280mm×30MM.The results show that the standing wave ratio of antenna and feed system is less than 2,the test axis ratio is less than 3.5db,and the antenna has high gain in the whole frequency band.The designed planar composite spiral antenna and curved balun meet the design requirements.3.Based on two self-developed antenna sensors and 3900a receiver,this paper designs a portable environmental electromagnetic monitor and its main control system.The software hierarchy of the system is designed and developed,and the corresponding communication protocol and data transmission protocol of each module are determined.Finally,a portable environment monitor with the functions of IQ identification,spectrum monitoring,time domain monitoring and switch pulse identification is realized.And the electromagnetic monitor is tested in the working environment.The results show that the designed monitor system has friendly interface and high accuracy,which can meet the performance requirements of the project.