一种小型的具有良好陷波特性的超宽带缝隙天线

 为了有效地抑制超宽带通信系统与窄带通信系统之间潜在的干扰,提出了一种小型的带组合陷波结构的缝隙超宽带天线.该天线采用印刷电路板上的多边形缝隙作为辐射单元,由背面的T形微带线馈电,天线的总尺寸仅为16mm×25mm×0.8mm.通过T形微带上开的一C形槽和地板上开的一矩形槽的组合陷波结构,产生阻带特性且阻带陡度更陡峭、带宽更宽,实现了良好的陷波功能.仿真和测试的结果表明,天线在超宽带系统3.1GHz~10.6GHz工作频段内的电压驻波比小于2,在5~6GHz频率范围实现了良好的滤波特性,有效地阻隔了无线局域网系统对超宽带系统的影响.同时该天线在整个工作频段具有良好的全向辐射方向特性和稳定的增益.     

一种具有三阻带特性的超宽带天线的设计与研究*

提出了一种紧凑型共面波导馈电的具有三阻带特性的超宽带天线。所设计天线的基本几何结构由共面波导(CPW)馈电线、菱形辐射贴片和矩形宽缝隙组成。通过在辐射贴片上刻蚀一个U型槽,以及在共面波导的接地面上增加两对L型的寄生旁枝结构来实现天线的三陷波特性。天线尺寸为32mm×32mm×0.508mm。仿真和实验结果表明,该天线在2.6~11.5GHz的频段内电压驻波比小于2,在3.15~3.80GHz、5.20~5.80GHz和8.2~8.7GHz三个频段内具有陷波特性,分别有效阻隔了Wi MAX系统、WLAN系统和ITU 8GHz频段信号对于超宽带(UWB)系统的干扰。在除三个阻带频段外的其余UWB工作频段范围内,具有良好的辐射方向特性和稳定的增益。仿真结果和实验结果表现出良好的一致性。     

一种双陷波超宽带阵列天线的设计

以传统矩形微带天线为基础模型,设计了一种双陷波超宽带阵列天线。阵列由两个相同结构的超宽带单极子天线构成,均由微带线馈电。通过在辐射贴片上蚀刻两个C型槽实现了WiMAX和WLAN频段的陷波,在两个贴片边缘开一个矩形缺口并加载寄生单元来提高隔离度。测试与仿真吻合度较好,天线覆盖2.5～12.0 GHz,具有3.3～3.7 GHz和5.1～5.9 GHz两个阻带,隔离度全部高于22 dB,峰值增益达6.7 dB,辐射方向近乎全向,可应用于UWB无线通信系统。     

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。     

一种共面波导馈电的双陷波渐变槽天线

为了滤除WIMAX(3.3～3.8 GHz)和WLAN(5.125～5.825 GHz)窄带信号对超宽带系统的干扰,该文提出一款共面波导馈电的小型化双陷波渐变槽天线。共面波导结构可以有效地扩展天线的带宽,实现对整个UWB(3.1～10.6 GHz)频段的全覆盖。通过在天线的馈线上开L型缝隙和在辐射贴片上开一对E字型缝隙的方法,有效实现了在3.15～3.97 GHz和4.94～6.05 GHz频段的双陷波特性,能够抑制WIMAX和WLAN对超宽带系统的干扰。该天线结构简单紧凑,尺寸非常小,仅为40 mm×18 mm×0.813 mm。仿真和实测结果表明该天线在超宽带波段内具有良好的陷波特性、增益特性,可以应用于小型化超宽带系统中。文中方法对于陷波渐变槽天线的研究具有一定的借鉴意义。     

一种紧凑型超宽带双陷波天线设计与研究

超宽带(UWB)系统的工作频段与现有的许多窄带系统频段相互重叠,因此各个系统信号之间存在潜在的干扰。针对上述问题提出了一种紧凑型超宽带双陷波天线。天线由一个圆形辐射贴片构成并通过50W的微带线进行馈电。接地板和传统的接地板相比被截短了,以提高天线的阻抗带宽。通过在辐射贴片上刻蚀H 型槽来实现天线的双陷波功能,并在微带馈线中引入了嵌入式谐振回路(ERC)结构,加大了天线的陷波深度和阻带宽度,陷波性能好于同频段的双陷波天线。仿真和测试结果表明,天线在3.1～4.2 GHz 以及5.0～6.6GHz 具有陷波特性,有效地避免了WiMAX 和WLAN 频段信号的干扰。同时在2.8 ~10.7 GHz 的其它频段上具有良好的阻抗匹配和较好辐射方向特性。天线的尺寸为34mm*26mm*1.6 mm,结构较为紧凑。     

一种新型的具有陷波功能的超宽带天线仿真与设计

提出了一种新型的具有陷波功能的共面波导(CPW)馈电的超宽带(UWB)天线,基于有限元电磁仿真软件HFSS对天线结构参数进行大量仿真优化,最终天线阻抗带宽为2.SGHz～ 12.0GHz,在3.3GHz～3.8GHz频段范围内实现了陷波阻带,在带通频段范围内实现了良好的辐射特性,并且具有较稳定的增益,为2.7dBi～5.8dBi.     

一种具有阻带特性的超宽带天线设计

文章提出了一种具有陷波功能的平面超宽带天线,通过在天线的辐射贴片上开缝,实现了天线在4.7GHz~5.84GHz的频带范围内的阻带特性,避免了超宽带系统与无线局域网之间的干扰。     

一种双陷波超宽带天线设计与研究

为了避免如WiMax和WLAN等窄带通信系统对超宽带通信系统的影响,该文提出一种具有双陷波特性的超宽带天线。该天线采用圆形贴片作为辐射单元,通过在贴片和接地板上分别开圆弧状的H形槽和L形槽来实现双陷波特性。天线在3.1~10.6 GHz的超宽带频段内能够有效地工作并抑制两种不同的窄带通信系统的干扰。同时圆弧状H形槽的参数研究表明,这种开槽结构能够以槽参数组合的形式更有效地控制陷波中心频率。实测和仿真结果吻合,该天线实现了良好的陷波功能,在工作频段内有良好的辐射方向特性。     

一种紧凑型超宽带双陷波天线的设计

提出了一款共面波导馈电的超宽带双陷波天线。该天线主要由梯形共面地、微带馈线和圆形辐射体三部分构成。其中,梯形共面地使天线实现超宽带,圆形辐射贴片上的倒L形槽和弧形槽使天线实现陷波特性。使用Ansoft HFSS软件对所设计天线进行仿真实验,然后加工成实物天线并进行测试。结果表明:天线回波损耗及辐射方向图的实测结果与仿真结果基本吻合,在3.0～10.9 GHz频段内,除陷波频段3.3～3.6 GHz和5.15～5.825 GHz外,天线的回波损耗均在-10 dB以下,相应工作频段内有较好的辐射方向图。因此,所设计的天线性能满足超宽带通信系统应用要求。     

一种双陷波超宽带单极子天线的设计

提出了一种新型双陷波特性的超宽带单极子天线。通过在介质基板上添加锥形辐射贴片,天线可以覆盖超宽带通信频段。在辐射贴片上引入上、下两个锥形缝隙结构,可以实现3.5 GHz、5.5 GHz的双陷波特性。天线实测模型电压驻波比＜2的阻抗带宽是2.56~10.61 GHz,其中3.18~3.76 GHz和4.4~5.75 GHz具有陷波特性。测试表明,天线在工作频带内具有全向辐射特性。     

新型小尺寸三陷波超宽带天线的设计

设计了一种紧凑的具有三陷波特性的超宽带天线。天线采用渐变微带线馈电,并通过矩形加半圆的辐射单元和半圆形地板来实现超宽带。通过在辐射单元上刻蚀对称的L形槽和圆环形槽,来实现在WLAN/WiMAX的陷波特性;在渐变微带馈线两侧增加对称的C形谐振器来达到在X频段的陷波特性。实验结果表明,天线在2.68~13GHz频段内电压驻波比小于2,同时在3.1~3.8GHz,5~5.9GHz,7.25~7.85GHz频段内有陷波抑制作用,且具有良好的辐射特性。天线具有较小的几何尺寸,仅为20mm×30mm。     

Dual mode wideband band-pass filter with notched band for communication system

This paper presents a planar microstrip wideband dual mode Band-Pass Filter (BPF) from 2 GHz to 3.4 GHz with a notched band at 2.62 GHz. The dual mode band-pass filter consists of a ring resonator with two quarter-wavelength open-circuited stubs at ?? =90° and ?? =0°, respectively. A square perturbation stub has been put at the corner of the ring resonator to increase the narrow stopbands and improve the performance of selectivity. By using a parallel-coupled feed line, a narrow notched band is introduced at the required frequency and its Fractional BandWidth (FBW) is about 5%. The proposed filter has a narrow notched band and a wide pass-band with a sharp cutoff frequency characteristic, the attenuation rate for the sharp cutoff frequency responses is 297.17 dB/GHz (calculated from 1.959 GHz with ?34.43 dB to 2.065 GHz with ?2.93 dB) and 228.10 dB/GHz (calculated from 3.395 GHz with ?2.873 dB to 3.507 GHz with ?28.42 dB). This filter has the advantages of good insertion loss in both operating bands and two rejections of greater than 16 dB in the range of 1.59 GHz to 1.99 GHz and 3.49 GHz to 3.98 GHz. Having been presented in this article, the measurement results agree well with the simulation results, which validates our idea.     

Compact ultra-wideband antenna with tri-band notched characteristic

A compact ultra-wideband printed planar antenna with tri-band notched characteristic is presented. Two different types of slots are used to obtain tri-band notched characteristic. By using a U-slot defected ground structure, a notched band, 5?6 GHz for WLAN, is achieved. An H-shaped slot is etched on the radiating patch to obtain another two notched bands at 3.3?3.7 GHz for WiMAX and 7.2 GHz for some C-band satellite communication systems. The proposed antenna yields an impedance bandwidth of 3.1?10.6 GHz with VSWR , 2, except the notched bands. The antenna is successfully simulated and measured, showing tri-band notched characteristic can be obtained by using two different slots.     

Compact UWB monopole antenna with quadruple band notched characteristics

ABSTRACT

A compact planar Ultrawideband (UWB) monopole antenna with quadruple band notch characteristics is proposed. The proposed antenna consists of a notched rectangular radiating patch with a 50 Ω microstrip feed line, and a defected ground plane. The quadruple band notched functions are achieved by utilising two inverted U-shaped slots, a symmetrical split ring resonator pair (SSRRP) and a via hole. The fabricated antenna has a compact size of 24 mm × 30 mm × 1.6 mm with an impedance bandwidth ranging from 2.86 to 12.2 GHz for magnitude of S₁₁ < ?10 dB. The four band notched characteristics of proposed antenna are in the WiMAX (worldwide interoperability for microwave access) band (3.25–3.55 GHz), C band (3.7–4.2 GHz), WLAN (wireless local area network) band (5.2–5.9 GHz) and the downlink frequency band of X band (7–7.8 GHz) for satellite communication are obtained. The measured and simulation results of proposed antenna are in good agreement to achieve impedance matching, stable radiation patterns, constant gain and group delay over the operating bandwidth.     

一种新型超宽带带通滤波器的设计

针对超宽带(UWB)系统易受无线网络信号干扰及传统的超宽带带通滤波器阻带较窄,不能有效抑制谐波的问题,提出了一种新型的UWB带通滤波器,该滤波器由两级交指梳状耦合谐振器级联组成,通过增加耦合指的个数来实现陷波特性,然后在两个交指谐振器的中间添加一个槽线锥形谐振器,使该滤波器具有抑制高次谐波特性,达到拓宽高阻带的效果,同时由于槽线谐振器的加入,陷波频段的抑制电平进一步提高.实验结果证明,所设计的滤波器既能保证3.1～10.6 GHz频段内的插入损耗小于3 dB,陷波频段为5.7～5.8 GHz,陷波频段的抑制电平高达-43 dB,同时又能拓宽高频阻带.     

Design of a Compact Hexagonal Monopole Antenna for Ultra—Wideband Applications

This paper presents two design compact hexagonal monopole antennas for ultra-wideband applications. The two antennas are fed by a single microstrip line . The Zeland IE3D version 12 is employed for analysis at the frequency band of 4 to 14 GHz which has approved as a commercial UWB band. The experimental and simulation results exhibit good agreement together for antenna 1. The proposed antenna1 is able to achieve an impedance bandwidth about 111%. The proposed antenna2 is able to achieve an impedance bandwidth about (31.58%) for lower frequency and (62.54%) for upper frequency bandwidth. A simulated frequency notched band ranging from 6.05 GHz to 7.33 GHz and a measured frequency notched band ranging from 6.22 GHz to 8.99 GHz are achieved and gives one narrow band of axial ratio (1.43%). The proposed antennas can be used in wireless ultra-wideband (UWB) communications.     

Controllable Band‐Notched Slot Antenna for UWB Communication Systems

We propose a slot antenna consisting of a rectangular slot on the ground plane, fed by a microstrip line with a rectangular‐ring‐shaped tuning stub that can be deployed in ultra‐wideband (UWB) communication systems to avoid interference with wireless local area network (WLAN) communication. Our antenna can achieve a single band‐notched property from the 5 GHz frequency to the 6 GHz frequency owing to a controllable band notch that uses L‐ and J‐shaped parasitic elements. The antenna characteristics can be modified to tune the band‐notched property (4 GHz to 5 GHz or 6 GHz to 7 GHz) and the bandwidth of the band notch (1 GHz to 2 GHz). Furthermore, the shifted notch with enhanced width of the band notch from 1 GHz to 1.5 GHz is described in this paper. The UWB slot antenna and L‐ and J‐shaped parasitic elements also provide the band‐rejection function for reference in the WiMAX (3.5 GHz) and WLAN (5 GHz to 6 GHz) regions of the spectrum. Experiment results evidence the return loss performance, radiation patterns, and antenna gains at different operational frequencies.     

具有陷波特性的宽带微带线-槽线巴伦的设计

提出了一种具有陷波特性的宽带微带线-槽线巴伦。通过采用阶梯型阻抗变换器,拓宽了巴伦的工作带宽。同时,在微带线的开路枝节上增加了一个1/4波长的开路枝节,使得巴伦可以在所需的频段内实现陷波特性。仿真结果表明,巴伦除在1.25~1.46 GHz频带内实现陷波外,在0.38~2 GHz频带内反射系数均＜-10 dB,插入损耗均优于-1.8dB。