基于开环谐振结构的超宽带天线设计

提出了一种新颖的小型共面波导馈电超宽带(UWB)天线.该天线是基于开环谐振器(SRRs)的结构变形而来,设计时共采用了三对成等差数列的开环谐振结构作为天线的辐射面,同时为了获得较好的超宽带频率特性,馈电微带线采用了渐变微带线共面波导馈电结构.通过数值仿真计算获得了优化后的天线几何尺寸,并且加工制作了一副天线,对天线的回波损耗特性、方向图以及增益都进行了测试.测试结果显示该天线具有良好的超宽带特性和较高的增益.     

超宽带折合环天线的设计与研究

提出了一种新型超宽带折合环形天线的设计.该天线采用共面波导馈电,易于与其他微波电路集成在一起;通过引入五边形的折合环结构,该天线的工作带宽较常规的折合环天线提高了一倍以上;通过数值计算研究了某些尺寸参数对天线输入特性的影响,在计算的基础上通过大量的实验详细研究了天线的频域工作特性.计算与实验的结果表明,该天线具有超过4.75:1的工作带宽和全向辐射特性,因此是一种有实用意义的超宽带天线.     

应用于无线USB的小型超宽带阻带天线

设计了一种用于超宽带无线通信系统的小型化天线.该天线贴片尺寸为20 mm×15 mm×3mm,采用U形折叠结构和渐变结构相结合,可使天线具有超宽带特性.为了减小对无线局域网(WLAN)系统5GHz频带的干扰,天线采取了叉形谐振结构来实现对相应频带的抑制.采用仿真软件分析了该天线阻抗带宽和不同频点处的辐射方向图.仿真和实...     

一种新型超宽带陷波天线的设计

提出了一种新型超宽带(UWB)陷波天线,该天线的结构由常规的圆形单极子天线演变而成。为获得超宽带特性,天线的辐射体被设计成渐变的笑脸形状。同时,通过在辐射贴片上开C形槽来实现陷波特性。合理选择C形槽的尺寸可有效去除超宽带频段内的无线局域网WLAN(5.150~5.825GHz)的干扰。仿真结果表明,天线在4.91~6.07GHz处形成了阻带特性(电压驻波比VSWR>2),天线结构新颖简单,适用于超宽带通信系统。     

一种新型的陷波天线

设计了一种新型的超宽带天线,具有小型化,2.0~10.6GHz的工作带宽及全向性的特点。基于该超宽带天线提出了一种新的实现陷波特性的方法,在天线的地板上添加一个近似半圆的谐振单元,该单元与辐射部分通过一个通孔相连,并且所加的结构对原始超宽带天线的其他特性影响很小。同时给出了该方法的等效电路。仿真与实测结构均表明该超宽带天线驻波比(VSWR)小于2的阻抗带宽是2.0~10.6GHz,天线在5.0~5.9GHz处有明显的陷波特性,很好的覆盖了无线局域网(WLAN)(5.125~5.85GHz)的工作频段。可以解决超宽带通信频段与WLAN间的电磁干扰问题,实现频谱兼容。     

共面波导馈电小型平面超宽带天线的设计与研究

首先提出了一种新结构共面波导馈电的小型平面超宽带(UWB)天线,该天线类似一般的共面波导馈电宽缝隙天线,为了获得超宽带工作特性,设计方案中采用了叉状结构的调谐支节,并将其辐射缝隙设计为多边形;通过数值计算研究了某些尺寸参数对天线输入特性的影响,在计算的基础上通过大量的实验详细研究了天线的频域工作特性,然后对其时域瞬时脉冲信号保真度特性进行了数值分析。计算与实验的结果表明,该天线具有超过3.2∶1的工作带宽和全向辐射特性,而且具有较好的线性相位传输特性和脉冲信号保真度,是一种有实用意义的超宽带天线。     

一种新型的陷波天线

设计了一种新型的超宽带天线,具有小型化,2.0~10.6 GHz的工作带宽及全向性的特点。基于该超宽带天线提出了一种新的实现陷波特性的方法,在天线的地板上添加一个近似半圆的谐振单元,该单元与辐射部分通过一个通孔相连,并且所加的结构对原始超宽带天线的其他特性影响很小。同时给出了该方法的等效电路。仿真与实测结构均表明该超宽带天线驻波比(VSWR)小于2的阻抗带宽是2.0~10.6 GHz,天线在5.0~5.9 GHz处有明显的陷波特性,很好的覆盖了无线局域网(WLAN)(5.125~5.85 GHz）的工作频段。可以解决超宽带通信频段与WLAN间的电磁干扰问题,实现频谱兼容。     

一种新型超宽带平面单极微带天线的设计与研究

为了适应超宽带通信应用的需求,设计了一种新型的超宽带天线.该天线以平面正方形单极微带天线为原型,通过数值计算获得天线的最佳几何尺寸,并对制作的实际样品进行了天线的反射特性、多天线间的互耦特性测试.研究结果表明该天线具有良好的超宽带特性,适合超宽带通信产品的应用.     

具有带阻特性的宽缝隙超宽带天线研究

根据短距离无线电通信系统对超宽带天线的要求,设计制作了矩形宽缝隙超宽带(UWB)天线,并通过加载λg/4开路枝节的方法实现了超宽带天线的带阻特性,分析了天线参数对其辐射特性的影响.仿真及实验结果表明:该天线满足短距离无线电通信系统对UWB天线的要求,实现了4.5～6 GHz的带阻特性,具有稳定的增益,良好的波形保真特性...     

一种改进的小型超宽带天线

为了有效地对超宽带天线进行小型化,通过对平面椭圆单极子超宽带天线进行切半和切边处理,设计了尺寸为10mm×17mm的小型超宽带天线。为了改善因对天线进行切半而恶化的全向辐射特性,在小型超宽带天线的辐射体中引入了缝隙结构。仿真结果表明:改进的小型超宽带天线在整个超宽带频带内具有良好的阻抗匹配和全向辐射特性。该天线的测量结果与仿真结果基本吻合。     

一种基于微带槽天线的带阻性UWB天线的研究

提出了一种新颖的小型平面超宽带天线。该天线由微带槽天线的基本结构变形而来,为获得超宽带的频率特性,设计时馈电微带采用了圆弧形调谐枝节,金属底板的开槽设计成对称多边形之后通过数值计算获得最佳的天线几何尺寸。通过HFSS仿真和测试设计了一种频率覆盖3.1～10.6 GHz的超宽带UWB天线,其对包含在超宽带频段范围内的民用频率范围有一定的滤除作用,结构简单并且驻波特性良好,方向图具有准全向性。     

一种新型的具有带阻特性的超宽带微带天线

设计制作了一种新型的具有带阻特性的超宽带微带天线。天线采用50Ω共面波导馈电结构,辐射单元采用圆形金属贴片,在圆形贴片上开一个倒U形槽,实现了天线的带阻特性。测试结果表明:在频率段2.8-12.0 GHz内(除5.00-5.95 GHz外)天线驻波比小于2,且天线具有近似全向辐射的特性;而天线在频率段5.00-5.95 GHz内形成了阻带,从而有效阻隔了WLAN(5.150-5.825 GHz)频率段。该天线具有尺寸小,易于与微波电路集成等优点,可以用于超宽带系统。     

Frequency notched wide slot antenna for UWB/2.4 GHz WLAN applications

A compact frequency notched microstrip slot antenna for ultra-wideband (UWB) /2.4 GHz-band wireless local area network (WLAN) applications is proposed. The antenna is similar to a conventional microstrip slot antenna; however, by introducing a cross wide slot and a meandered-slotted stub, both compact size and frequency notched function can be achieved. It has been studied both numerically and experi- mentally for its impedance bandwidth, surface current distribution, radiation patterns, and gain. As will be seen, an operation bandwidth of over 4.61 ranging from 2.39 to 11.25 GHz for return loss lower than having a frequency notched band ranging from 4.75 to 5.85 GHz has been achieved, and good radiation performance over the entire frequency range has also been achieved.     

Triangular quad-port multi-polarized UWB MIMO antenna with enhanced isolation using neutralization ring

In this study, a quad-port multi-polarized ultra-wideband (UWB) multiple input multiple output (MIMO) antenna system with a new isolation technique is designed for wireless devices. The antenna structure consists of four triangular monopole elements and neutralization ring (NR) structures. The monopoles are back-to-back positioned in symmetrical and orthogonal arrangement. Therefore, they radiate towards four directions without interference, and thus the diversity performance is improved. A novel NR is formed by combining a rectangular ring and a straight line to reduce the mutual coupling due to interoperation of the elements. Each triangular monopole is fed by 50 Ohm microstrip transmission line (MTL) with a thin strip line for ensuring impedance matching. Antenna performance in terms of impedance bandwidth, current distribution, radiation pattern, peak gain and envelope correlation coefficient (ECC) is also investigated. The MIMO antenna system has 3.1–17.3 GHz impedance bandwidth, 1–5 dBi peak gain variation, less than 0.1 ECC. The results indicate that the proposed antenna has the characteristics of larger UWB bandwidth, high isolation by the NR structure, multi-polarization, uniform gain and quasi-omnidirectional pattern.     

Ultra-wideband antipodal slot antenna with improved radiation performance

A novel antipodal wide-slot antenna for ultra-wideband (UWB) applications is proposed and studied in detail. The antenna is fed by a microstrip line terminated with a rectangular tuning patch. An antipodal structure is employed to improve the radiation performances. The return losses, surface E-field, current distribution, radiation patterns and gains of the antenna are numerically and experimentally investigated. Results show that the proposed antipodal antenna has an impedance bandwidth from 0.79 to 4.0?GHz, which is about 5:1. Compared with conventional rectangular wide-slot antenna, more stable radiation pattern with lower cross-polarisation level and flatter gain variation over a 3:1 bandwidth can be obtained. Thus, the proposed antenna should be more suitable for future UWB-multiple-input multiple-output applications using polarisation diversity than conventional UWB rectangular slot antennas.     

Frequency notched ultra-wideband microstrip slot antenna with fractal tuning stub

A frequency notched ultra-wideband (UWB) microstrip slot antenna with a fractal tuning stub is proposed. The antenna is similar to a conventional microstrip slot antenna, and by introducing a fractal tuning stub, frequency notched function is achieved. The antenna was studied experimentally regarding impedance bandwidth, radiation patterns and gain. The operation bandwidth of the antenna is from 2.66 to 10.76 GHz, in which a frequency notched band from 4.95 to 5.85 GHz was achieved, along with good radiation performance over the entire frequency range.     

具有陷波功能的超宽带缝隙天线的设计与研究

提出了一种具有陷波功能与分形调谐支节的新型超宽带缝隙天线.该天线的结构类似于一般的微带缝隙天线,通过采用分形调谐支节引入半波长谐振结构,使得该天线不仅具备了超宽带缝隙天线的优点,还具备灵活可调的陷波功能.通过计算、测量和尺度放大实验,充分考察了天线的频域特性.实验结果表明该天线的工作频带为2.66～10.76 GHz,在4.95～5.85 GHz频段上具有陷波功能,同时具有相对稳定的辐射方向性和近似的全向特性.该研究对设计小型超宽带天线具有一定的价值.     

A compact CPW fed slot antenna for ultra wide band applications

A printed compact coplanar waveguide fed triangular slot antenna for ultra wide band (UWB) communication systems is presented. The antenna comprises of a triangular slot loaded ground plane with a T shaped strip radiator to enhance the bandwidth and radiation. This compact antenna has a dimension of 26 mm × 26 mm when printed on a substrate of dielectric constant 4.4 and thickness 1.6 mm. Design equations are implemented and validated for different substrates. The pulse distortion is insignificant and is verified by the measured antenna performance with high signal fidelity and virtually steady group delay. The simulation and experiment reveal that the proposed antenna exhibits good impedance match, stable radiation patterns and constant gain and group delay over the entire operating band.     

Compact linear tapered slot antenna for UWB applications

A novel ultra-wideband (UWB) antenna consisting of a linear tapered slot in the ground plane and a microstrip to slotline transition is investigated. The antenna possesses a wide bandwidth from 2.95?14 GHz for |S₁₁| < - dB and shows stable radiation patterns with an average gain of 3 dBi throughout the band. Measured group delay and transmission characteristics indicate that the antenna has good pulse handling capabilities.