Research And Design Of Four-Channel Broadband Transmitter System

With the rapid development and spread of high-tech,the efficiency of work in various fields is also increasing,coal mining technology is also progressing,efficiency continues to increase,while coal mine water and gas safety and other sudden accidents still occur.Aiming at the complicated geology around the coal seam and reducing the coal mine safety accident,the paper designs a wireless transmission system which can detect water and gas in coal seam.This paper studies the Four-channel broadband transmitter system,which mainly includes the signal generator,power amplifier and antenna.Signal generator uses a relatively popular FPGA to design and realize.In the QuartusII 13.1 development environment,through the preparation of Verilog hardware description language,intelligently and quickly producing the required high-frequency signal,and calling ModelSim on the generated signal simulation verification finally;The Power amplifier is based on the front and rear signal power requirements,using the PHILIPS company's high-frequency power transistor BLF404,with Altium Designer software to achieve transistor peripheral circuit and PCB design,and be used to simulate with ADS;While the Antenna adopts microstrip antenna which is suitable for wireless detection,so half-wavelength dual-band microstrip patch antenna has been put to use,with HFSS on the antenna simulation optimization,making physical antenna finally.The FPGA produced four high-frequency pulse signal in this system,respectively,traversing the power amplifier,high-frequency signal will be feed through antenna into the ground,thus completing the launch function.Taking advantage of the characteristics of multi-channel and multi-frequency technology,it is possible to detect the type and distribution structure of underground media.This will be of great practical significance to understand the situation around coal seam and reduce coal mine safety accidents in advance.The innovation for the system,this paper analyzes and simulates the modules.The results show that the design of the four-channel broadband transmitter system can be realized.It can detect the water and gas in the coal seam and play a role to promote the wireless advanced detection technology.