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。     

一种小型化双陷波可重构UWB天线设计

提出了一种小型化的双陷波可重构超宽带(ultra wide band, UWB)天线,通过在辐射贴片上刻蚀大、小两个C形槽,实现5G (3.3~4.4 GHz)/WiMAX (3.3~3.6 GHz)和WLAN (5.150~5.825 GHz)两个频段的陷波. 采用两个PIN二极管跨接在C形槽上,通过控制PIN二极管的通断状态,在两个频段上实现陷波可重构. 为了实现小型化,天线采用削顶圆形结构的辐射贴片,并将C形槽设计为嵌套结构,天线最终尺寸为18.0 mm×19.5 mm. 仿真与测量结果表明:天线可以在UWB、两种单陷波和双陷波共四种状态下工作,UWB频段为3.1~11.0 GHz,两个单陷波频段分别为3.2~4.9 GHz、5.2~6.0 GHz,双陷波频段为3.25~4.75 GHz和5.3~6.1 GHz. 天线的最大增益为2.8 dBi,具有良好的辐射特性.     

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。     

一种陷波可重构的超宽带天线设计与研究

该文设计了一种具有四陷波及可重构特性的超宽带天线。通过在天线辐射贴片、微带馈线上刻蚀U形槽,以及在改进型地板上添加环形开口寄生单元来实现天线四陷波特性。采用在陷波结构中加入PIN二极管开关的方法实现陷波可重构特性,通过开关的断开与闭合,分别实现三陷波和四陷波特性,从而进一步提高了超宽带频段的利用率。分析了天线陷波产生的原理,研究了天线部分尺寸参数对陷波的影响。通过仿真和实物测量结果对比表明,该天线在3~11.74 GHz频段内可有效抑制窄带系统的干扰。天线尺寸为24 mm×16 mm×0.8 mm,结构较紧凑,可广泛用于各种超宽带通信系统。     

一种新型具有双陷波特性的超宽带天线设计

本文提出了一种新型紧凑的具有双陷波特性的印刷超宽带天线。天线采用微带传输线馈电,并通过圆形与矩形 的混合结构辐射单元和带有矩形开槽结构的地板来实现天线的超宽带特性,工作带宽覆盖UWB 频率范围。通过地板上 两个对称的J 形开槽和微带馈线两侧对称添加的线型结构单元来实现双陷波特性,两个陷波频段刚好覆盖了3.5GHz 的 WIMAX 频段标准和5.2/5.8GHz 的WLAN 频段标准。同时,该天线在工作频带范围内具有良好的辐射特性,符合超宽带 通信的使用标准。     

紧凑型多陷波超宽带天线设计与研究

提出了一款紧凑型多陷波特性超宽带天线,该天线由圆形贴片和改进的接地板组成。采用在辐射贴片上开两个圆弧状U形槽和接地板上开一个U形窄缝隙的结构使其具有多陷波特性。天线的体积仅为32 mm′25 mm′1.6 mm,结构紧凑。仿真与测试结果表明:该天线工作带宽为2.8 ~ 16 GHz,实现了3.2~3.8 GHz、4.5~5.5 GHz 和7.2~8.6 GHz 3个频段的陷波特性,有效阻隔了WiMAX(3.3~ 3.6 GHz)、大容量微波通信频段(4.5~5 GHz)、部分WLAN(5.1~5.35 GHz)、X波段(7.25~7.75 GHz)和国际电信联盟(ITU)波段(8.01~8.5 GHz)窄带信号的干扰。除陷波频段外该天线具有良好性能和辐射方向性,更适合应用于超宽带系统。     

具有陷波特性梯形印制单极超宽带天线

设计了带三角形槽梯形辐射元和阶梯接地面的30 mm×30 mm印制单极超宽带天线原型.实验结果表明,原型天线驻波比小于2的阻抗带宽为2.8 GHz～12.81 GHz,频带内天线具有全向辐射特性,增益变化平坦,相位中心稳定.通过对原型天线振子体的缝隙加载,实现了具有带阻特性的陷波超宽带天线,其驻波比大于3的陷波频带为4.8 GHz～6.0 GHz,陷波频带内最高增益抑制为9 dB,而其他频段性能与原型天线基本一致.     

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。     

Compact Quad Band-Notched Monopole Antenna for UWB Systems

A novel compact microstrip-fed UWB antenna with quad notched band is proposed. The antenna consists of a rectangular radiating patch with a half circle, a tapered microstrip feed-line, and a semi-elliptical ground plane. With a pair of L-shaped slots, complementary co-directional SRR and a pair of C-shaped stubs, four notched bands are created to prevent interference from WiMAX/lower WLAN/higher WLAN/X-band. Experimental results show that the designed antenna, with compact size of 20 × 30 mm², has an ultrawide band (VSWR < 2) from 2.68 to 13 GHz, except four notched bands of 3.13–3.8, 4.87–5.52, 5.65–6.1, 7.12–8 GHz. Good radiation patterns and stable gain within the operating band have been observed.     

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.     

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.     

一种新型双陷波超宽带天线设计

设计了一种新型双陷波超宽带印刷天线。辐射贴片底部为梯形结构,实现了良好的阻抗匹配。通过在贴片上加载两个U型缝隙,分别在中心频率3.5GHz和5.5GHz处产生陷波。比较陷波前后天线表面电流密度,并用传输线理论对陷波产生机理进行了分析。天线实测与仿真结果吻合,通带内天线辐射效果良好,陷波频段内增益下降超过5dB,达到了陷波抑制的效果。     

Performances of OSIC Detector of an UpLink OFDM Massive-MIMO System in Rayleigh and Ricain Fading Channels

A compact rectangular microstrip-fed Ultra Wideband patch antenna with double band notched feature at Wi-Max and WLAN is offered in this paper. The designed antenna is composed of an ordinary rectangular patch antenna with a partially defective ground structure. For achieving dual notch characteristics a ‘U’ and ‘Reversed U’ slots are embedded in the radiating patch. The partial ground plane structure with U shaped slot in the middle is incorporated for achieving additional resonance and bandwidth enhancement. The proposed antenna has a measurement of 20 × 33 × 1.6 mm³. First notch created by U shaped slot at frequency 3.5 GHz is for Wi-Max (from 2.9 to 4.5 GHz) and Second notch which is generated by Reversed U shaped slots at frequency 5.4 GHz is for WLAN (from 5.49 to 6.45 GHz). The antenna covers almost complete range of Ultra Wideband (3.1–10.6 GHz). The Simulation analysis of the proposed antenna is carried out using CST-2011 simulation software. The radiation pattern of the simulated antenna is near Omnidirectional and the Gain of proposed antenna is almost stable over the range of UWB excluding notch bands.

     

Band-notched inverted-cone monopole antenna for compact UWB systems

A microstrip-fed planar ultra-wideband monopole antenna with bandnotch characteristics is proposed. The antenna size is compact (18 x 30 mm) and operates over an extremely wide band of 3-16 GHz. The proposed design consists of an inverted cone as the radiating patch and a tapered ground plane. Wideband matching is obtained by properly shaping the ground. A pair of symmetrically placed quarter wave slot resonators is embedded in the ground plane for rejecting the 5-6 GHz WLAN band. Results indicate a stable and omnidirectional radiation pattern with an average gain of 3 dBi and a sharp reduction in gain at notched frequencies. Moreover, measured group delay and transmission characteristics show excellent transient response.     

A slot resonators based quintuple band-notched Y-shaped planar monopole ultra-wideband antenna

A Y-shaped ultra-wideband (UWB) monopole antenna containing modified ground plane with five stop bands is presented. An inverted U-shaped slot and a C-shaped slot are placed on Y-shaped radiating patch to achieve two notched bands while three pairs of C-shaped slots are placed at different positions on modified ground plane to achieve three more notched bands. The proposed antenna is designed, fabricated and experimentally tested. The designed Y-shaped antenna has overall dimensions of 36 × 38 × 1.6 mm³ (0.34λ_l × 0.36 λ_l × 0.016 λ_l) and has impedance bandwidth 2.86–13.3 GHz at |S₁₁| < −10 dB level. Measured band notches are achieved at 3.75/5.43/7.87/8.62/9.87 GHz centre notched frequencies to eliminate worldwide interoperability for microwave access (WiMAX) band (3.45–4.0 GHz), wireless local area network (WLAN) band (5.15–5.90 GHz), X-band for satellite communication (6.77–8.00 GHz), ITU-8 band (8.3–9.1 GHz), and radio navigation (RN) band (9.3–10.6 GHz), respectively. Variation of slot parameter on individual band notch is also investigated. Omnidirectional radiation pattern for XZ-plane and dipole-like radiation pattern for YZ-plane are observed. Stable gain, variation of phase response in linear fashion and group delay <1.3 ns for whole ultra-wideband except at band notches is achieved.     

Compact,Isolation Enhanced,Band-Notched SWB–MIMO Antenna Suited for Wireless Personal Communications

Herein, a Conductor Backed Co-Planar Waveguide fed, compact, slotted Multiple–Input–Multiple–Output or MIMO antenna having Super Wideband (SWB) response and tunable band-notching feature is presented. In addition, an improved method for cut-off frequency prediction of the antenna is formulated. A super wide frequency response from 01.21 to 34.0 GHz and notches at Wireless Local Area Networks or WLAN bands (04.92–05.83 GHz) and Worldwide Inter-operability for Microwave Access or WiMAX bands (03.30 GHz–03.70 GHz) are obtained. By fine tuning the dimensions of the Split Ring Resonator Structure introduced in the radiating element, band-notched characteristics centered at 05.50 GHz WLAN band is obtained. A second band notch having centre frequency at 03.50 GHz for the WiMAX band is obtained by the introduction of a Spiral Microstrip Defected Structure in the feeding segment. The antenna is 20?×?36?×?1 mm³ in dimension. Acceptable gain all through the functional bandwidth, excepting the notched bands makes the MIMO antenna a novel contender for SWB operations particularly for Wireless Personal Communications.

     

Dual Band-Notched Small Monopole Antenna with Enhanced Bandwidth for UWB Applications

This article proposes a novel printed monopole antenna for ultra wideband applications with dual band-notch function. The antenna consists of a disc-shaped radiating patch with a pair of folded strips arms, and a ground plane with a two L-shaped conductor backed plane, which provides a wide usable fractional bandwidth of more than 140 % (2.6–14.43 GHz). In order to generate single band-notch characteristics, we use a modified disc-shaped radiating patch with a pair of folded strips arms also by using this modified radiating patch, additional resonance is excited and hence much wider impedance bandwidth can be produced, especially at the higher band. By adding two L-shaped conductor backed plane in the ground plane a dual band notch function is achieved. The measured results reveal that the presented dual band-notch monopole antenna offers a very wide bandwidth with two notched bands, covering all the 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX and 4 GHz C bands. The designed antenna has a small size of $12\times 18\,\hbox {mm}^{2}$ .