Antenna Design Of Cable-less Seismograph Nodes Based On WLAN Communication

Microseismic monitoring technology has become more and more concerned as an important technology for monitoring petroleum fracturing.This monitoring method not only improves the recovery ratio but also reduces the cost of the project,which has important guiding significance for the actual construction.In the microseismic monitoring,many seismographs were arranged around the monitored wellsite which transmitted the collected data to the upper computer through the antenna,and processed the experimental data through the upper computer to give the fracture.Therefore,the antenna as a seismograph node plays an important role in the important part of information transmission.In order to achieve miniaturization(<550mm2),wideband(>50%)design indicators,this paper used the slotted gap method,supplementary active network method and other technical means to achieve miniaturization;During the design process,we continuously simulated and optimized the feed branches and the gap structure to achieve wideband requirements.First,a printed antenna was applied to the node of the cableless seismograph.The innovation of this design is that the working bandwidth of the antenna is effectively enhanced by using a five-pronged feedband and a tapered impedance transformer.The feed strip connects the triangle and the two branches to form an upper surface radiating patch.This structure can effectively shunt current to produce three resonant frequencies.The M and F components are primarily used as meandering techniques to increase the current path on the antenna surface,reduce the resonant frequency of the antenna,and improve the bandwidth of the antenna.This antenna is suitable for WLAN and Wi MAX(5.15-5.35 GHz)high frequency bands.Design an integrated antenna that integrates the GPS/Wi MAX / WLAN bands.The printing gap method was used for research.The innovation of the design is that the lower surface of the antenna is formed by a rectangular groove,an inverted C stub and two inverted L stubs.The upper surface is a stepped radiation patch,and the antenna slot coupling is mainly applied to generate a frequency band.This design antenna covers GPS(1575.42±1.023MHz),Wi MAX band(2.5~2.7GHz)and WLAN band(2.4~2.484 GHz,5.725~5.825GHz).The antenna application is described under the seismograph node system to meet the communication requirements between the central control unit and the AP(access port)relay.