陷波平面超宽带天线的研究进展

随着对超宽带平面天线的研究和广泛应用,在超宽带天线中实现对其他无线通信设备特别是WLAN设备的干扰抑制成为近年来的研究热点。介绍了陷波特性超宽带天线的技术背景,对近几年国内外关于陷波超宽带天线的最新研究成果进行了分析总结,研究成果对超宽带天线的设计和频带的抑制具有一定的指导作用。最后对无线通信中超宽带天线的发展趋势进行了展望。     

具有多阻带特性的超宽带天线研究与设计

设计一种具有多阻带特性的平面超宽带天线,采用在辐射贴片开C型槽和H型槽的方法实现天线在Wi MAX频段和WLAN频段的带阻抑制特性。U型槽孔产生高于10.6 GHz的高频阻带,同时馈线终端的阶梯结构实现了多频宽带的匹配。该天线在3.16~3.73 GHz,4.63~6.02 GHz以及高于10.6 GHz的超宽带频带内形成阻带,表明其在工作频带内有良好的抗干扰能力。此外,在天线的通带内有良好的全向特性,结果表明该设计方法的有效性。     

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。     

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。     

基于遗传算法设计的双陷波超宽带天线

为了抑制窄带信号对超宽带系统的干扰,利用遗传算法结合时域有限差分法分两次优化设计了一种新型双陷波平面超宽带天线,在3.5~4.2GHz和5~6GHz范围实现了频率阻断,并将天线加工成实物,电压驻波比的实测结果、CST仿真结果和数值计算结果基本一致。分析了天线陷波的原理,并利用仿真软件研究了天线性能。结果显示,所设计的天线具有良好的性能,能够广泛应用于无线通信设备中;该设计理论简单,通用性强,对以后设计陷波超宽带天线具有指导作用和参考价值。     

超宽带天线的研究现状与展望

对超宽带天线已有的研究方法进行了总结和分析,概述了相关拓宽频带的措施,总结了超宽带天线的设计思想,对近年来超宽带天线的研究现状进行了介绍,最后研究了天线的Q因子,对未来利用Q因子设计宽带天线进行了展望。     

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.     

一种新型具有带阻特性的超宽带天线

提出了一种新型共面波导馈电的,具有带阻特性的平面单极子超宽带天线.为了抑制与WLAN系统的干扰,通过在天线平面上加入调谐支节,从而达到了在WLAN频段上的带阻特性.该天线在回波损耗S11≤-10 dB的工作频带带宽达到了2.49～14.53 GHz,并且在4.9～5.92 GHz频带内形成了阻带.采用基于有限元的电磁场仿真软件HFSS进行了优化,并绘出天线的方向图,结果表明该设计方法的有效性.     

3．1～17GHz的带阻超宽带单极天线

提出一种用于超宽带系统的小型化平面单极天线,采用共面波导馈电,其辐射贴片采用矩形与半椭圆形组合的结构,使其在3．1～17GHz的频带内驻波比〈2,同时引入开环谐振结构实现频带抑制,使其在5．1—5．9GHz的频带内驻波比〉2。仿真结果与实测结果匹配良好。     

一种新型超宽带平面单极天线的设计

提出了一种新型超宽带平面单极子天线。该天线由一个倒置的月牙形金属贴片和一个槽口金属接地板构成,采用微带线对其进行馈电。通过数值仿真和实验测量,该平面结构的单极天线具有超宽带性能,实测天线的-10dB回波损耗的频率覆盖范围为3．2～1．8GHz,相对带宽达115％,阻抗带宽达到3．6倍频。且该天线体积小、结构简单、加工简便,适合应用于短程超宽带通信系统。     

一种新颖可控陷波特性的超宽带天线

设计了一种具有可控陷波特性的超宽带天线,有效抑制了超宽带通信系统与窄带通信系统之间潜在的干扰。该天线的尺寸仅为3.5 cm×3.5 cm×0.1 cm,使用微带线进行馈电,并通过在天线单元上加载支节,从而实现天线可控陷波特性。利用仿真软件HFSS对天线进行计算,对天线的阻抗、方向图特性进行仿真对比。仿真结果表明,天线在超宽带系统3.1 GHz~25 GHz工作频段内的电压驻波比（VSWR）小于2,在5.2 GHz~5.8 GHz频率范围内的滤波特性较好,有效降低了无线局域网系统对超宽带系统的影响,在工作频段内该天线的辐射方向特性和方向图特性都较为理想。     

Design of a Multiresonator Loaded Band-Rejected Ultrawideband Planar Monopole Antenna With Controllable Notched Bandwidth

We present a new multiresonator loaded band-rejected planar monopole antenna for ultrawideband applications. The proposed microstrip-fed antenna is composed of a flared metal plate, a truncated ground plane, and two pairs of folded strips. By applying the resonance nature of the folded strips and the associated cross coupling effects, the proposed antenna demonstrates bandstop-filter-like response with bandwidth controllability at the targeted rejection band. To illustrate the antenna operating mechanism more clearly, an equivalent circuit model consisting of RLC lumped resonators and J-inverters is discussed and extracted. The antenna input admittance calculated with the help of the equivalent circuit model agrees reasonably well with the simulated one obtained by the full-wave simulator. The design concept and the simulated and experimental results including the return losses, radiation patterns, and gain responses versus frequencies are carefully investigated throughout the paper. A parametric study in terms of the bandwidth tunability of the proposed design at the notched band is performed. The effects of the finite size ground plane are studied in this paper as well.      

基于SRR结构的陷波超宽带天线设计

针对超宽带系统易受窄带信号干扰的问题,设计了一种新颖的基于金属开口谐振环(SRR)结构的平面超宽带陷波天线。在天线的辐射贴片上加载U形缝隙,实现了其陷波特性。利用仿真软件研究了U形缝隙的物理尺寸对其陷波特性的影响,并对所设计的超宽带天线进行了制作和测量。结果表明,所制天线在超宽带系统3.1~10.6GHz工作频段的电压驻波比(VSWR)小于2,在WLAN频段具有良好的陷波特性,有效地抑制了超宽带通信系统与窄带通信系统之间潜在的干扰。     

Circular Fractal Antenna Design with Inscribed Square for Ultra Wide Band Applications

Journal of Communications Technology and Electronics - In this article, an ultra-wide band circular fractal antenna inscribed with square is presented. The prototype of the antenna is fabricated on...     

超宽带多功能数字化相控阵雷达系统技术

针对未来高威胁战场环境和复杂的作战使命要求,简要介绍了超宽带多功能数字化相控阵雷达系统技术,分析了影响其性能的几项主要技术,包括超宽带天线技术及波束控制技术、宽带信号波束形成实现技术、多功能多任务控制与调度技术、数字TR技术和DBF技术,以及它们的实现途径。     

Compact Coplanar Waveguide-fed Planar Antenna for Ultra-wideband and WLAN Applications

A novel compact planar antenna is presented for Ultra-wideband (UWB) applications in this paper. The proposed antenna has rectangle-like slot and it is fed by coplanar waveguide. The antenna is printed on FR4 substrate and it has compact size of $28 \times 31 \times 0.8 \,\,\text{ mm}^{3}$ . Parametric study is performed on the antenna by investigating the effect of various geometrical parameters on the frequency characteristics. The antenna is fabricated and measured. It has better return loss response and stable gain over the entire UWB band. The antenna has stable radiation pattern and good impedance matching over entire ultra-wide bandwidth of 3–10.6 GHz. The results show that there is good agreement between measured and simulated results. Various features such as compactness, simple configuration and low fabrication cost make the antenna suitable for UWB and wireless local area network systems.     

On the design of CPW-feed diamond shape fractal antenna for UWB applications

This article presents the design of diamond shape fractal antenna with coplanar waveguide feed for ultra-wide bandwidth. This new fractal antenna has been designed on substrate ε_r ?=?4.3 and thickness h?=?1.53?mm. The antenna has been constructed incorporating fractal geometry in a circular disc of 30?mm diameter. The experimental result of this proposed antenna exhibits the excellent ultra-wide bandwidth from 2.05?GHz to 6.245?GHz. The detail parametric studies have been carried out using electromagnetic simulator HFSS10. The experimental results are in close agreement with the simulated results. The experimental radiation patterns are nearly omni-directional in H-plane and dumble shape in the E-plane throughout the frequency band of interest. The measured group delay of this antenna is stable throughout the band. Such type of antenna is useful for ultra-wideband communication system, microwave imaging and precision positioning system.     

Analysis of the small band-rejected antenna with the parasitic strip for UWB

A novel band-rejected ultrawideband antenna with one parasitic strip is presented in this paper. It is designed to work on a substrate FR4 that has a thickness of 1 mm and relative permittivity of 4.6, and to operate from 3 to 17 GHz. The proposed antenna is fed by microstrip line and utilizes the parasitic strip to reject the frequency band (5.15-5.825 GHz) limited by IEEE 802.11a and HIPERLAN/2. The size of the antenna is 20/spl times/20 mm/sup 2/ and this antenna has good radiation characteristics. Effects of varying the location and length of the parasitic strip and the structure of the ground and monopole patch on the antenna performance have also been studied.     

集成鳍线为脊的新型圆锥及方锥TEM喇叭及其在目标瞬态特性中的应用

发明了一种共面波导到鳍线的宽带过渡结,采用该结构方式馈电,研制了一种新型超宽带集成鳍线辐射器,把此种鳍线作为圆锥ＴＥＭ喇叭或者方锥ＴＥＭ喇叭的脊,成为超宽带鳍线加脊的ＴＥＭ喇叭,该种喇叭及其脊的形式均为国内外首创。