一种接地板开槽的耦合馈电紧凑型天线阵列

提出了一种接地板上开槽的耦合馈电紧凑型微带天线阵。通过采用耦合馈电技术,其工作宽频带和增益等特性优于传统的微带天线;在接地板开槽使得天线尺寸缩小,结构十分紧凑。给出了2.4 GHz频段天线阵列的实例,仿真和实验结果表明,可实现10%的相对带宽,并具有良好的辐射特性。     

正交异性非二次屈服函数探讨

迄今有关异性材料的研究资料表明,不同材料的屈服准则,宜用不同次方的函数描述。但是,能描述正交异性的,目前只有二次函数和四次函数两种形式的屈服准则,不敷应用。本文提出了一个正交异性任意次方式屈服函数。对一些材料的应用表明,预测结果良好。     

A Novel Tri-band GPS/WLAN Antenna for Tablet with Full Metal Housing

A full metal housing antenna for tablet to cover the GPS and WLAN b/g/a bands(1565-1585,2412-2484 and 4920-5825 MHz) is presented. The cavity is created by the enclosed volume of PCB and metal housing of the tablet. The cavity is properly excited by a flat exciting element w ith dimensions of only 36×4mm~2 positioned at an open slot betw een PCB and metal housing at the tablet's top surface. Among many excited cavity mode resonances,the ones close to the target frequency bands w ere selected and properly adjusted by adding grounding vias and shorting strip based on the E field distributions. This unique cavity mode excited antenna has measured-6dB return loss bandw idth of 1500-1600MHz,2380-2500 MHz,4580-5960 MHz and the average efficiencies for all the three bands are over 50%. Therefore,it overcomes the efficiency degradation issue that traditional IFA or monopole antennas are facing at the full metal housing environment.