Multi-Reconfigurable Band-Notched Coplanar Waveguide-Fed Slot Antenna

This paper proposes an antenna design concept to achieve a multi-reconfigurable band-notch antenna by using a set of microswitches. The proposed idea was proved by the design of the coplanar waveguide(CPW)-fed slot antenna. The sample design gives a wideband antenna the impedance bandwidth of which covers the frequency ranged from 1.9 GHz to 6.55 GHz.The antenna could be configured to work either in single-band mode or in one of the defined dual-band modes.

New band-notched UWB antenna

A simple and compact ultra wideband （UWB） printed monopole antenna with band-notched performance is proposed in this paper. The antenna is partially grounded so that the Q value is depressed and the impedance bandwidth is broadened. A small strip bar is loaded on each arm of the similar U-shaped radiator. The impedance bandwidth of the antenna overlap with IEEE 802.11a is rejected consequently. The geometry parameters of the antenna are investigated and optimized with HFSS. The measured bandwidth of the proposed antenna occupies about 7.89 GHz covering from 3.05 GHz to 10.94 GHz with expected notched band from 4.96 GHz to 5.98 GHz. A quasi-omnidirectional and quasi-symmetrical radiation pattern in the whole band is also obtained. As a result, a UWB wireless communication system can be simplified with the band-notched UWB antenna presented.

Optimization of band-notched UWB antenna using micro-genetic algorithm combined with FDTD

The micro-genetic algorithm (MGA) optimization combined with the finite-difference time-domain (FDTD) method is applied to design a band-notched ultra wide-band (UWB) antenna. A U-type slot on a stepped U-type UWB monopole is used to obtain the band-notched characteristic for 5 GHz wireless local area network (WLAN) band. The measured results show that voltage standing wave ration (VSWR) less than 2 covers 3.1-10.6 GHz operating band and VSWR more than 2 is within 5.150-5.825 GHz notched one with the highest value of 5.6. Agreement among the calculated, HFSS simulated and measured results validates the effiectiveness of this MGA-FDTD method, which is efficient for UWB antennas design.

A U-Shaped UWB Antenna with Band-Notched Performance

An ultra-wideband antenna with controllable band-notched is presented. Two semi-ellipses with different radiuses are subtracted to result in the main patch. By varying inner and outer radiuses, much more enhancement in bandwidth occurred. A U-shaped slot is used to make band-stop performance. Measured S11 is ≤-10 dB over 2.3 - 5 GHz and 6.1 - 15.1 GHz.

A NOVEL ULTRA WIDEBAND MONOPOLE ANTENNA WITH BAND-NOTCHED CHARACTERISTICS

A simple and compact microstrip-fed Ultra WideBand(UWB) printed monopole antenna with band-notched characteristic is proposed in this paper.The antenna is composed of a square ring with a small strip bar,so that the antenna occupies about 7.69 GHz bandwidth covering 3.11～10.8 GHz with expected band rejection from 5.12 GHz to 5.87 GHz.A quasi-omnidirectional and quasi-sym-metrical radiation pattern is also obtained.This kind of band-notched UWB antenna requires no ex-ternal filters and thus greatly simplifies the system design of UWB wireless communication.

A Novel Bow-Tie Antenna with Triple Band-Notched Characteristics for UWB Applications

This paper presents the design of a compact bow-tie antenna with triple band notched characteristics for UWB applications. The proposed antenna can operate from 3.1 to 10.6 GHz with VSWR - 8.4 GHz) centered at 8.1 GHz, the CSRR2 rejects the WLAN band (5.15 - 5.85 GHz) centered at 5.6 GHz, and the CSRR3 rejects the band (4.10 - 4.47 GHz) centered at 4.32 GHz. Compared with recent design, this antenna is more compact, and presents better simulation results of its characteristics. Our newly designed antenna is a potential candidate for application in UWB communication systems.

基于MOEA/D算法的三陷波超宽带天线设计

为实现超宽带通信中对WIMAX(3.3~3.7 GHz)、WLAN(5.150~5.825 GHz)和ITU(8.01~8.50 GHz)频段干扰的抑制,提出了一种基于MOEA/D算法优化设计的具有三陷波特性的超宽带天线。天线采用T形结构作为辐射贴片,通过改变贴片形状等方法实现在3~12 GHz的超宽带。在辐射贴片上刻蚀两个U形缝隙和在传输线两侧加载C形开口环,对天线进行陷波设计。利用MOEA/D算法对陷波结构的结构参数和加载位置进行优化,实现了在3.31~3.69 GHz、5.25~6.13 GHz和8.01~8.51 GHz频段的陷波效果,成功抑制了频段干扰。与传统扫频优化的设计方法相比,采用MOEA/D算法设计的天线在陷波频带内增益低至-19 dB,各陷波频带准确度误差均在3.6%以下,提高了天线的设计效率,具有一定的工程应用价值。

双陷波可重构特性的蓝牙超宽带天线设计

提出了一种具有双陷波可重构特性的蓝牙/超宽带(UWB)天线。天线由削顶圆形单极子天线加载1/4波长圆弧枝节组成。在圆形贴片上刻蚀2个半波长圆形缝隙,实现WLAN(5.125~5.825 GHz)和ITU(8.025~8.4 GHz)频段的陷波功能。通过控制安装在陷波结构中PIN二极管的工作状态,能够实现陷波的可重构特性。测试与仿真结果表明:在天线工作频段2.39~2.52 GHz和2.92~12 GHz内,天线辐射性能良好,峰值增益达到5.2 dBi。可广泛应用在各种通信系统。

一种超宽带双陷波可穿戴天线设计

基于牛仔布柔性材料,设计了一种小型化双陷波超宽带可穿戴天线。天线由牛仔布料基板、开槽单极子辐射贴片和缺陷地平面构成,具有超宽带特性,能覆盖3.1~10.6GHz的超宽带频段范围。通过在天线接地板刻蚀两条新型蜿蜒形槽和在单极子辐射贴片上添加对称枝节以实现双陷波特性。该天线结构紧凑,尺寸仅为24mm×28mm×0.84mm。仿真的-10dB天线工作带宽为143.7%(2.95~18GHz),并且天线在3.24~3.87GHz和5.11~5.91GHz频段内具有双陷波特性,能有效抑制全球微波互联接入系统(WiMAX)和无线局域网(WLAN)频段的干扰。此外,对天线的可弯曲性、辐射性能以及人体安全性能进行了分析。测试与仿真结果基本一致,表明该天线可用于可穿戴系统中。

基于人工表面等离激元的小型化电可调缺口带滤波器

具有小型化的缺口带滤波器在微波集成系统中具有广泛的应用前景.本文基于倒山形单元的人工表面等离激元(spoof surface plasmon polariton,SSPP)提出了一种新型小型化电可调缺口带滤波器.与相同横向尺寸的传统SSPP单元相比,所提出的倒山形单元的色散曲线表现出更好的慢波特性,渐近频率降低至原来的55%.缺口带的频率可通过调整变容二极管两端的偏置电压来动态控制.随着偏置电压从0.5 V增至30 V,缺口带频率从2.1 GHz移动到2.3 GHz,实现动态调节.仿真结果表明,缺口带滤波器通带内实现了较低的插入损耗(S_(21)<-1 dB)和良好的回波损耗(S_(11)>-10 dB),并且具有小型化的优势,尺寸仅为0.78λ_(g)×0.35λ_(g),λ_(g)是中心频率处的波长.采用印刷电路板技术实际加工了缺口带滤波器.实物测量和仿真结果吻合较好,验证了设计的可靠性.

具有五陷波的超宽带天线设计

设计了一款具有五陷波特性的小型化超宽带天线,通过改变陷波结构参数和分析天线表面的电流分布,研究了陷波结构对超宽带及陷波特性的影响。天线尺寸仅为25 mm×20 mm×1 mm。辐射贴片由矩形和圆形贴片组成,背板通过切角挖槽实现了超宽带特性;添加对称钩型枝节,蚀刻U型槽及3类U型槽产生5个陷波。天线的工作带宽在3.8~16 GHz。有效抑制了国际卫星波段(4.5~4.8 GHz)、WLAN下行波段(5.15~5.35 GHz)、UNII-2c(5.47~5.725 GHz)、WLAN上行波段(5.725~5.825 GHz)、下行卫星系统频段(7.25~7.75 GHz)、上行卫星系统频段(7.9~8.4 GHz)、国际电信联盟频段(8.01~8.50 GHz)的干扰。天线在工作频带内具有全向性,增益平均在4 dBi以上。仿真和实测结果基本吻合,表明该天线可用于超宽带通信系统。

Monopole Crescent Elliptical Antenna with Band-Notched Characteristics for UWB Applications

A compact antenna with extended band-notched characteristics was designed for ultra wideband （UWB） communications. The antenna consists of a crescent-shaped elliptical patch with a T-shaped stub and a square ground board plane. The antenna is easily integrated with radio-frequency/microwave circuits to reduce the manufacturing cost. The central frequency and the notch bandwidth can be adjusted by changing the size of the T-shaped stub. Simulations verify the design characteristics. Measurements show that the antenna produces the UWB working bandwidth.

一种多陷波超宽带微带天线设计方法

超宽带无线通信技术工作频带范围在3.1~10.6 GHz,与现有的窄带系统频带重叠,易造成信号间干扰。鉴于此,提出基于拓扑优化的方法,利用Matlab和HFSS联合仿真实现超宽带微带天线在3个特定频段的陷波设计。以30 mm×40 mm×1mm的FR4作为介质基板,通过拓扑优化和灰狼算法相结合设计天线构型。优化后构型的工作带宽为3.1~10.6 GHz,在3.1~3.76、4.52~4.76和7.12~8.27 GHz 3个频段内反射系数S_(11)>-10 dB,实现了目标频段80%的带阻特性,有效抑制全球微波接入频段(world interoperability for microwave access,WiMAX)和C波段2个频段的信号干扰。数值算例表明:利用拓扑优化方法可以实现多陷波超宽带微带天线的设计,验证了拓扑优化方法在超宽带多陷波天线设计的高效性,拓宽了拓扑优化方法在天线设计领域的应用。

一种紧凑型电磁带隙结构双陷波超宽带天线设计

基于单EBG结构设计一种带有双陷波功能的超宽带单极子天线。以杯型贴片构成天线辐射单元,馈线处引入半圆开口谐振环-电磁带隙(Semicircular Split Ring Resonator Electromagnetic Bandgap,SCSR-EBG)结构,通过将半圆环型EBG结构开口,构成谐振回路,从而在EBG陷波频率的基础上产生第二陷波频率。与传统EBG结构相比,该结构紧凑,陷波性能明显,单个SCSR-EBG单元(0.13λc1*0.065λc1)可以有效消除WiMAX和WLAN两个频段干扰。仿真和测试结果表明,天线在陷波频段处驻波比(Voltage Standing Wave Ratio,VSWR)>10,通带内具有稳定的辐射特性,可应用于超宽带通信系统。

毫米波宽带双陷波MIMO天线设计

为有效抑制部分毫米波通信信号干扰,实现无线通信设备小型化,设计了一款具有双陷波特性的毫米波宽带MIMO天线。天线基本单元由辐射单元、微带馈线、Rogers RO4350B基板以及接地板构成。通过在天线辐射贴片刻蚀U型槽,以及接地板添加倒U型枝节,可在工作频段内产生双陷波特性;进一步在接地板引入圆形开槽使MIMO天线获得良好的隔离度。该天线结构紧凑,尺寸仅为26.7 mm×16.67 mm×1.524 mm,工作于21~40 GHz频段,其中陷波频段为22.04~24.72 GHz和25.96~31.2 GHz。结果表明:该天线在工作频段内隔离度大于20 dB,最大增益可达8.49 dBi,包络相关系数(ECC)均小于0.002,具有良好的辐射和增益性能,在毫米波超宽带通信中具有应用潜力。

一种四端口多陷波超宽带天线的设计

针对超宽带(Ultra-Wideband,UWB)多输入多输出(Multiple-Input Multiple-Output,MIMO)天线存在陷波数量少和隔离度不高等问题,提出了一种四端口多陷波超宽带天线。将带有梯形缺口的椭圆形与圆形结合作为辐射贴片实现超宽带功能,利用上下层的十字结构提高隔离度。通过在辐射贴片上蚀刻一个C型开口环槽和一个类C型槽以及添加一对C型开口环,实现WIMAX(3.3~3.6 GHz)、国际移动通信系统(IMT-2020(5G))通信波段(4.84~4.98 GHz)、X下行波段(7.25~7.75 GHz)、国际电信联盟ITU(8.025~8.4 GHz)四个陷波频段。仿真与实测结果表明,该UWB-MIMO天线的工作带宽为3.0~14.0 GHz,仿真结果与实测结果基本吻合。天线隔离度小于-25 dB,包络相关系数(ECC)整体小于0.007,分集增益(DG)值大于9.999,性能指标良好,可以满足UWB-MIMO天线的要求。

具有宽上阻带和双陷波的超宽带滤波器

基于偏置环形谐振器和加载电容器的缺陷地结构设计了一种具有宽上阻带和双陷波的超宽带滤波器。利用奇偶模分析法分析三阶接地短截线的传输极点与结构的对应关系,得到了一个具有五个传输极点的结构。通过采用三阶接地短截线结构和偏置环形谐振器的级联结构得到通带和宽上阻带,通带范围为2.95~12.24 GHz,相对带宽达到122%,上阻带大于10 dB,衰减范围至28.04 GHz。引入两个相同的H形缺陷地结构,并且在缝隙处焊接电容器,在2.69 GHz处共同产生传输零点来改善滤波器带外抑制特性。使用两个不同尺寸的半H形缺陷地结构分别在5.64 GHz和8.31 GHz处产生陷波,陷波衰减分别为16 dB和20 dB,提高滤波器的抗干扰能力。

基于极化分集的四单元三陷波超宽带天线设计

针对超宽带(UWB)系统中存在窄带信号干扰的问题,设计了一种四单元三陷波UWB天线。天线由4个水平正交放置的圆形贴片、微带馈线以及矩形接地板组成,通过在天线辐射贴片和微带馈线上刻蚀不同结构的几何缝隙实现了天线的三陷波特性。在介质基板背面添加十字形谐振枝节,有效提高了天线单元之间的隔离度。该天线尺寸为40 mm×40 mm×1.6 mm。实验结果表明:工作带宽为2~12 GHz,包络相关系数(ECC)小于0.02,分集增益(DG)大于9.92 dB,总有效反射系数(TARC)小于-2.38 dB,可广泛应用在UWB系统中。

具有阻带特性的超宽带MIMO天线设计

根据通信系统中对超宽带传输的要求,设计了一种基于共面波导馈电(CPW)的高隔离度二阻带超宽带多输入多输出(MIMO)槽天线。天线由两个正交放置的辐射贴片组成,印制在FR4介质基板上,辐射贴片为矩形与半圆形相结合的渐变形结构。在辐射贴片处刻蚀C形槽,以及在辐射贴片背部加载开口谐振环(SRR),可抑制WLAN和X波段的干扰。通过引入栅栏形枝节,提高了MIMO天线的隔离度。实测结果表明,该天线工作带宽为3.00~10.66 GHz,此范围内端口隔离度S_(21)均低于-27 dB,在5.11~5.96 GHz和6.82~7.86 GHz处具有阻带特性,包络相关系数(ECC)均小于0.03,可应用于需要抑制多个窄带信号干扰的超宽带MIMO通信系统。

针对eLORAN系统窄带干扰的权函数陷波算法

针对增强型罗兰(eLORAN)系统的带内干扰问题,该文基于陷波滤波器(NF)原理提出一种抗带内窄带干扰的自适应权函数陷波算法(WF-NF)。首先,该文分析讨论了NF算法在eLORAN系统中的适用性及检测频差引起的伪收敛问题;之后通过增加频差权函数,推导出新的WF-NF算法,解决了固有频差导致的陷波逻辑缺陷;随后,提出梯度跳跃收敛优化技术,改进了权系数收敛速度过慢的问题;最后,通过多种环境下的实验验证了算法的稳定性、多元适用性及实用性。分析结果表明,WF-NF算法能够克服检测频差的实际问题,实现高效的干扰跟踪及滤除,同时也可以补偿干扰检测精度,进而为后续的信号处理流程提供保障。