Design And Development Of Power Line Communication Coupler Based On Ni-Zn Ferrite

Power line communication(PLC)is a kind of data transmission communication technology using medias such as the power line,coaxial cable and telephone lines.At present,power line network has been distributed everywhere.Using power line network for data transmission can not only reduce the communication cost,but also greatly expand the communication range by taking advantage of its wide coverage.As a key part of signal coupling in power line communication system,the signal coupling module realizes the transmission and access of the high frequency signals in power line channel,playing an important role in the whole system.Currently,there are two kinds of coupling devices for power line communication,namely capacitive coupler and inductive coupler,with different installation methods and cable connections.The inductive coupler working with the principle of electromagnetic induction is the main research obj ect of this topic.As a medium to transmit electric energy,power line itself cannot transmit data.Therefore,the use of power lines to transmit data will be subj ect to a number of limitations.The main purpose of this work is to couple the transmission signal into the power line with a low insertion loss.The inductance coupler is simulated by using CST modeling.By means of the non-contact inductance coupler,the carrier signals on the wire with large diameter are coupled into the one with small diameter,and then enter the power line carrier handling veneer,so as to realize the coupled transmission of the signals.Based on the ringlike coupler model,we designed other three open type inductive couplers adopting round,square and triangular openings respectively on the core ring in order to further improve the performance of the coupler.The characteristic parameters of these inductive couplers(including coupling coefficient and insertion loss,etc.)are simulated.The structure model of the inductive coupler was established,in which the key technologies are the selection of magnetic core materials and the design of the coupler structure.In addition,this paper also simulated the microstrip antenna with Ni0.5Zn0.5Fe2O4 ferrite as the substrate material,and mainly studied the structure of the microstrip antenna and the influence of ferrite material's own electromagnetic characteristics on the performance of the microstrip antenna.