Different feeding techniques of microstrip patch antennas with different spiral defected ground structures are presented in this paper. The investigated structures illustrate some merits in designing multi-electromagn...Different feeding techniques of microstrip patch antennas with different spiral defected ground structures are presented in this paper. The investigated structures illustrate some merits in designing multi-electromagnetic band-gap structures by adjusting the capacitance and changing the inductance through varying the width and length of spiral defected ground structure. Then by applying the three different spirals shapes (one, two and four arms) as the ground plane of microstrip patch antenna with different feeding techniques to create multi or ultra wide-band, improve the antenna gain and reduce the antenna size, it is found that the four arms spiral defected ground structure of microstrip patch antenna with offset feed gives good performance, electrical size reduction to about 75% as compared to the original patch size and ultra-wide bandwidth extends from 2 GHz up to 12 GHz with ?8 dB impedance bandwidth.展开更多
An uncommon fractal construction method is applied in the microwave element design. A novel fractal defected ground structure （DGS） based on micro electro-mechanical system （MEMS） is proposed. The size of this nov...An uncommon fractal construction method is applied in the microwave element design. A novel fractal defected ground structure （DGS） based on micro electro-mechanical system （MEMS） is proposed. The size of this novel fractal DGS can achieve 86% size reduction compared with the conventional dumbbell type DGS. This novel fractal DGS is used in the miniaturization design of L-band microstrip antenna array. The simulation result shows that this novel fractal DGS can effectively reduce the mutual coupling between the antenna elements, so it is helpful to the miniaturization of microstrip array, namely the approximately same gain value can be achieved with the shorter distance between elements.展开更多
在Vicsek结构的分形理论基础上进行了改进,提出了一种具有良好空间填充性和自相似特性的新型类Vicsek分形天线,并在接地板上引入缺陷地结构（Defected Ground Structure,DGS）来改善频率、抑制谐波,得到了可以运用在无线局域网（Wireles...在Vicsek结构的分形理论基础上进行了改进,提出了一种具有良好空间填充性和自相似特性的新型类Vicsek分形天线,并在接地板上引入缺陷地结构（Defected Ground Structure,DGS）来改善频率、抑制谐波,得到了可以运用在无线局域网（Wireless Local Area Networks,WLAN）、全球微波互联接入（Worldwide Interoperability For Microwave Access,WiMAX）以及C波段卫星通信的四个频段.天线的谐振频率分别为2.45GHz、3.46GHz、5.8GHz和7GHz,相应带宽为0.2GHz（2.37~2.57GHz）、0.49GHz（3.2~3.69GHz）、0.75GHz（5.52~6.27GHz）和0.56GHz（6.68~7.24GHz）,增益最高达到4.89dB.天线的小尺寸及全向性辐射特性表明该天线能很好地满足便携式多频段移动设备的要求.展开更多
文摘Different feeding techniques of microstrip patch antennas with different spiral defected ground structures are presented in this paper. The investigated structures illustrate some merits in designing multi-electromagnetic band-gap structures by adjusting the capacitance and changing the inductance through varying the width and length of spiral defected ground structure. Then by applying the three different spirals shapes (one, two and four arms) as the ground plane of microstrip patch antenna with different feeding techniques to create multi or ultra wide-band, improve the antenna gain and reduce the antenna size, it is found that the four arms spiral defected ground structure of microstrip patch antenna with offset feed gives good performance, electrical size reduction to about 75% as compared to the original patch size and ultra-wide bandwidth extends from 2 GHz up to 12 GHz with ?8 dB impedance bandwidth.
文摘在传统微带线结构基础上利用阶跃阻抗并联短截线SISS(Step-Impedance Shunt Stubs)的带阻及慢波抑制特性,提出了一种新的基于SISS缺陷微带线结构S-DMS(SISS Defected Microstrip Structure),利用该结构设计制作了具有谐波抑制功能的双通带滤波器。采用HFSS进行仿真优化,在此基础上进行了实物加工,获得了通带中心频率为3.5 GHz,8.5 GHz,插入损耗分别为0.45 d B,2.7 d B,3 d B带宽分别是550 MHz,260 MHz,带外最大抑制小于-40 d B的实测结果,与仿真结果相当吻合。结果表明该双通带滤波器具有良好的谐波抑制能力、小带内衰减和宽且深的阻带特性。
基金supported by the 11th Five-Year Plan under Grant No. 11001030203
文摘An uncommon fractal construction method is applied in the microwave element design. A novel fractal defected ground structure （DGS） based on micro electro-mechanical system （MEMS） is proposed. The size of this novel fractal DGS can achieve 86% size reduction compared with the conventional dumbbell type DGS. This novel fractal DGS is used in the miniaturization design of L-band microstrip antenna array. The simulation result shows that this novel fractal DGS can effectively reduce the mutual coupling between the antenna elements, so it is helpful to the miniaturization of microstrip array, namely the approximately same gain value can be achieved with the shorter distance between elements.
文摘在Vicsek结构的分形理论基础上进行了改进,提出了一种具有良好空间填充性和自相似特性的新型类Vicsek分形天线,并在接地板上引入缺陷地结构（Defected Ground Structure,DGS）来改善频率、抑制谐波,得到了可以运用在无线局域网（Wireless Local Area Networks,WLAN）、全球微波互联接入（Worldwide Interoperability For Microwave Access,WiMAX）以及C波段卫星通信的四个频段.天线的谐振频率分别为2.45GHz、3.46GHz、5.8GHz和7GHz,相应带宽为0.2GHz（2.37~2.57GHz）、0.49GHz（3.2~3.69GHz）、0.75GHz（5.52~6.27GHz）和0.56GHz（6.68~7.24GHz）,增益最高达到4.89dB.天线的小尺寸及全向性辐射特性表明该天线能很好地满足便携式多频段移动设备的要求.
