A low profile dual-band multiple-input-multiple-output (MIMO) antenna system is proposed. The proposed MIMO antenna consists of two low profile unbalanced fed inverted L antennas with parasitic elements to resonate at...A low profile dual-band multiple-input-multiple-output (MIMO) antenna system is proposed. The proposed MIMO antenna consists of two low profile unbalanced fed inverted L antennas with parasitic elements to resonate at 2.45 GHz and 5 GHz. The structure is uncomplicated by locating two ultra low profile inverted L antennas on the finite conducting plane. The proposed MIMO antenna is numerically and experimentally analyzed. When the size of conducting plane is 55 mm by 55 mm and the height of antenna is 9 mm, the directive gain of 4.11 dBi and the S11 bandwidth of 5.71% are achieved for lower frequency of 2.45 GHz. At the upper frequency of 5 GHz, the directive gain of 8.22 dBi and the S11 bandwidth of 6% are obtained. The proposed antenna has good diversity gain, shown by the correlation coefficient becomes less than 0.005 at the frequency of 2.45 GHz and 5 GHz band when the distance between inverted L elements is 41 mm. A good agreement between calculated and measured results is obtained. The results show that the weak mutual coupling of the proposed antenna and this feature enables it to cover the required bandwidths for WLAN operation at the 2.4 GHz band and 5 GHz band.展开更多
为满足机载系统的需要,给出了共形相控阵天线的分析和设计过程,同时研制了一种高度仅为0.14波长的准八木天线单元。利用三维电磁仿真软件HFSS对天线单元和共形相控阵进行了仿真设计,并研制了一套L频段共形相控阵天线。该天线由天线阵面...为满足机载系统的需要,给出了共形相控阵天线的分析和设计过程,同时研制了一种高度仅为0.14波长的准八木天线单元。利用三维电磁仿真软件HFSS对天线单元和共形相控阵进行了仿真设计,并研制了一套L频段共形相控阵天线。该天线由天线阵面、波束形成网络和波控器等构成。天线阵面由4个天线单元组成,共形安装在机头上。经实际测试,共形相控阵天线阵面的和波束在扫描范围内增益大于10 d Bi,并具有较低的副瓣电平;差波束零深小于-20 d B。展开更多
针对无线通信系统中的多频段传输要求,设计了一种倒L型宽频带双频天线。通过在传统平面单极子天线的辐射振子上增加谐振枝节,形成两个倒L结构,获得能完全覆盖WLAN频段的宽频带双频天线。利用HFSS13.0电磁仿真软件,对天线进行参数仿真优...针对无线通信系统中的多频段传输要求,设计了一种倒L型宽频带双频天线。通过在传统平面单极子天线的辐射振子上增加谐振枝节,形成两个倒L结构,获得能完全覆盖WLAN频段的宽频带双频天线。利用HFSS13.0电磁仿真软件,对天线进行参数仿真优化分析。仿真结果表明,当S_(11)<-10 d B时,天线的工作频段分别为2.32~2.77 GHz,5.00~6.75GHz,相对带宽分别达到17.6%,29.8%,频率为2.4 GHz时增益为8.04 d Bi,5.2 GHz时为7.61 d Bi。相较于传统的平面单极子天线,该天线有更好的带宽、增益、辐射特性。展开更多
L波段阵列天线是隐身平台的强散射源之一,其主要散射源包括结构项散射、模式项散射及散射栅瓣三类。对上述三类强散射源进行机理分析,提出相应的缩减方法,完成了天线的RCS(Radar Cross Section雷达散射截面)缩减设计,并针对L波段一维低...L波段阵列天线是隐身平台的强散射源之一,其主要散射源包括结构项散射、模式项散射及散射栅瓣三类。对上述三类强散射源进行机理分析,提出相应的缩减方法,完成了天线的RCS(Radar Cross Section雷达散射截面)缩减设计,并针对L波段一维低RCS阵列天线的特点,对结构项散射缩减等方法给出了数值仿真验证。针对所示算例,仿真结果表明,采用矩形平板偏置15°的方法,3 GHz频率下可以将结构项散射由3.5 d Bsm降低到–26 d Bsm。展开更多
文摘A low profile dual-band multiple-input-multiple-output (MIMO) antenna system is proposed. The proposed MIMO antenna consists of two low profile unbalanced fed inverted L antennas with parasitic elements to resonate at 2.45 GHz and 5 GHz. The structure is uncomplicated by locating two ultra low profile inverted L antennas on the finite conducting plane. The proposed MIMO antenna is numerically and experimentally analyzed. When the size of conducting plane is 55 mm by 55 mm and the height of antenna is 9 mm, the directive gain of 4.11 dBi and the S11 bandwidth of 5.71% are achieved for lower frequency of 2.45 GHz. At the upper frequency of 5 GHz, the directive gain of 8.22 dBi and the S11 bandwidth of 6% are obtained. The proposed antenna has good diversity gain, shown by the correlation coefficient becomes less than 0.005 at the frequency of 2.45 GHz and 5 GHz band when the distance between inverted L elements is 41 mm. A good agreement between calculated and measured results is obtained. The results show that the weak mutual coupling of the proposed antenna and this feature enables it to cover the required bandwidths for WLAN operation at the 2.4 GHz band and 5 GHz band.
文摘为满足机载系统的需要,给出了共形相控阵天线的分析和设计过程,同时研制了一种高度仅为0.14波长的准八木天线单元。利用三维电磁仿真软件HFSS对天线单元和共形相控阵进行了仿真设计,并研制了一套L频段共形相控阵天线。该天线由天线阵面、波束形成网络和波控器等构成。天线阵面由4个天线单元组成,共形安装在机头上。经实际测试,共形相控阵天线阵面的和波束在扫描范围内增益大于10 d Bi,并具有较低的副瓣电平;差波束零深小于-20 d B。
文摘针对无线通信系统中的多频段传输要求,设计了一种倒L型宽频带双频天线。通过在传统平面单极子天线的辐射振子上增加谐振枝节,形成两个倒L结构,获得能完全覆盖WLAN频段的宽频带双频天线。利用HFSS13.0电磁仿真软件,对天线进行参数仿真优化分析。仿真结果表明,当S_(11)<-10 d B时,天线的工作频段分别为2.32~2.77 GHz,5.00~6.75GHz,相对带宽分别达到17.6%,29.8%,频率为2.4 GHz时增益为8.04 d Bi,5.2 GHz时为7.61 d Bi。相较于传统的平面单极子天线,该天线有更好的带宽、增益、辐射特性。
文摘L波段阵列天线是隐身平台的强散射源之一,其主要散射源包括结构项散射、模式项散射及散射栅瓣三类。对上述三类强散射源进行机理分析,提出相应的缩减方法,完成了天线的RCS(Radar Cross Section雷达散射截面)缩减设计,并针对L波段一维低RCS阵列天线的特点,对结构项散射缩减等方法给出了数值仿真验证。针对所示算例,仿真结果表明,采用矩形平板偏置15°的方法,3 GHz频率下可以将结构项散射由3.5 d Bsm降低到–26 d Bsm。