钻井液环境无线传输微型PIFA共形天线研制  

Development of micro PIFA conformal antenna for wireless transmission in drilling fluid environme

作　　者：夏文鹤[1] 邓力浩川 官文婷 过方舟 陈一健 Xia Wenhe;Deng Lihaochuan;Guan Wenting;Guo Fangzhou;Chen Yijian(School of Electrical Information,Southwest Petroleum University,Chengdu 610500,China;Engineering Technology Research Institute,Petrochina Southwest Oil&Gasfield Company,Chengdu 610050,China;School of Petroleum and Gas Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学电气信息学院,成都610500 [2]中国石油西南油气田公司工程技术研究院,成都610050 [3]西南石油大学石油与天然气工程学院,成都610500

出　　处：《国外电子测量技术》2024年第10期135-144,共10页Foreign Electronic Measurement Technology

基　　金：国家重点研发项目(2023YFB3210205)资助。

摘　　要：井下上返式微球测量仪需在钻井液环境中实现无线数据传输功能,其直径一般不超过10 mm,该参数限制了无线收发结构的尺寸,同时,传统天线大多采用低损耗板材,不利于大批量应用。针对上述问题,提出了辐射贴片弯折与地平面开槽的方法对传统PIFA天线进行改进,天线平面尺寸仅为17 mm×8.4 mm×0.049 mm,较类似天线的设计缩小了68.3%;天线通过柔性印刷电路技术制造,弯曲175°后安装在微球测量仪表面。天线在相对介电常数为81、电导率为1.258 S/m的钻井液中测得的谐振点频率为310 MHz,对应回波损耗为-32.4 dB,-20 dB带宽为35 MHz。天线在相对介电常数和电导率不同的钻井液中,均具有较为理想的全向辐射特性。相比其他天线,所提出的天线在尺寸、谐振点频率和回波损耗等性能指标上均具有一定的先进性。综上,所提出的天线可用于微球测量仪在钻井液环境中的无线通信,使原有微球测量仪的数据传输方式由有线通信变为了无线通信,降低了井下测量短节的设计难度,提升了数据传输的时效性。The downhole upwelling microsphere measuring instrument needs to realize wireless data transmission function in drilling fluid environment,and its diameter is generally not more than 10 mm,which limits the size of wireless transceiver structure.At the same time,traditional antennas mostly use low-loss plates,which is not conducive to large-scale applications.To solve the above problems,this paper proposes the method of bending the radiation patch and grooving the ground plane to improve the traditional PIFA antenna.The plane size of the antenna is only 17 mm×8.4 mm×0.049 mm,which is 68.3%smaller than that of similar antenna designs.The antenna is manufactured by flexible printed circuit technology,bent at 175°and mounted on the microsphere measuring instrument surface.The resonant point frequency measured by the antenna in the drilling fluid with relative dielectric constant of 81 and conductivity of 1.258 S/m is 310 MHz,corresponding return loss is-32.4 dB,and the bandwidth of-20 dB is 35 MHz.The antenna has ideal omnidirectional radiation characteristics in drilling fluids with different relative dielectric constant and conductivity.Compared with the antennas proposed in other literatures,the antennas proposed in this paper are advanced in dimensions,resonant frequency and return loss.In summary,the antenna proposed in this paper can be used for wireless communication of the microsphere measuring instrument in the drilling fluid environment,which changes the data transmission mode of the original microsphere measuring instrument from wired communication to wireless communication,reduces the difficulty of designing the downhole measuring sub,and improves the timeliness of data transmission.

关 键 词：PIFA 辐射贴片弯折 地平面开槽 柔性印刷电路 井下微球测量仪 

分 类 号：TN2[电子电信—物理电子学]