Research On Receive Technology Of Microwave Nondestructive Testing System

Introduce practical application of research results and an overview of the development of microwave nondestructive testing system at home and abroad as well as discussions of the microwave imaging technology and its development. The basis of modern electromagnetic theory is Maxwell's equations. Address Maxwell's equations and its border condition. These are very important theoretical basics. As the non-destructive testing of microwave imaging systems combine with the algorithm completed with reinforced concrete imaging detection, several commonly used electromagnetic imaging algorithm are introduced. Study on structure and principle of the microwave nondestructive testing of reinforced concrete, which has great significance.Introduced Agilent's ADS and Ansoft's HFSS which is mainly EDA simulation software used in microwave and high frequency and electromagnetic fields. ADS's specific application of the simulator and the direction of the simulation process have been given. Introduce concrete steps which simulate antenna by HFSS and pay attention to some matters. Establish specifically simulation mode and do simulation test by HFSS and ADS software.Design a wide frequency band microwave power detector. The use of EDA software tools to design power Detection frequency coverage 0.8GHz～2.4GHz, which is satisfied system requirement. In the process of designing, an accurate simulation of frequency, power and temperature in power detection circuit performance by ADS are given. It features lots of advantages such as small in size, wide frequency band, stable and reliable performance, easily being integrate .It can be widely applied in the microwave field.Design a piece of print wide frequency band antenna. When VSWR is less than 2, antenna's relative bandwidth can reach to 1. This design can completely covers 0.8GHz～2.4GHz which the system required. Dielectric constant of 2.6, thickness 2.8mm PTFE material is selected as substrate of antenna, and the top and bottom of substrate are copper which a good conductor is. The S-parameters, the radiation characteristics and surface current distribution of antenna radiator are simulated with HFSS. From the result of simulation, the design is satisfied requirement.