一种采用微带馈电的陷波超宽带天线的设计

提出了一种改进的贴片超宽带天线。所设计的天线的是印刷在35mm＊35mm＊1mm的FR-4介质基板上。采用微带线馈电,通过将传统的矩形贴片改进为多边环形辐射单元,并且为了拓宽宽带特性,在接地板上刻蚀出一个凹形槽,使其满足超宽带系统（3.1～10.6GHz）的带宽要求。同时为了避免无线局域网（WLAN）的干扰,利用开路微带线来使天线具有陷波特性。采用高频结果仿真软件HFSS对天线进行仿真,结果表明该天线在超宽带频带范围内的回波损耗小于-10dB,同时实现了所需频带的陷波特性。     

一种新型平面结构的双陷波超宽带天线设计

为了避免现存的一些窄带通信系统对超宽带天线的干扰,提出了一种具有双陷波特性的超宽带天线结构。由于采用了渐变式阶梯阻抗匹配结构作为超宽带基础天线的馈电,使天线具有了宽阻抗匹配能力。通过在基础天线背面附加双偏T寄生单元和在辐射贴片上开窗的联合方法,实现了超宽带天线的双陷波特性。天线电流分布结果可以完全反映出在陷波频率下两种方法的谐振抑制作用,而且实验结果表明该结构的天线对 WLAN(5.15～5.825 GHz) 和WiMAX(3.4～3.69 GHz)频段的信号起到了有效的抑制作用,同时在工作频段内表现出较好的全向辐射特性。     

一种基于仿生学的小型双陷波超宽带天线

基于仿生学原理,以对称牛头形设计了一款小型超宽带双陷波功能微带天线。该天线包括带有“牛角”的对称牛头形的主体辐射单元,采用共面波导结构进行馈电。通过仿真及实验验证可以看出该天线在3. 3 ～3. 8GHz 和5. 0～5. 5GHz 具有良好的陷波特性,天线的驻波比从2.1GHz 覆盖到了14.4GHz (VSWR<2),相对阻抗带宽超过了149%。     

新型陷波超宽带天线设计

为了避免超宽带通信中其他系统的干扰问题,设计了一种双阻带的超宽带天线。通过采用一种不等宽的条带结构,从而较好地实现了双阻带特性。除了在要求屏蔽的WiMAX频段(3.3~3.7 GHz)以及X频段的卫星通信下行频段(7.25~8.395 GHz),回波损耗S11在整个频段<-10 dB。通过仿真设计结果表明,该天线在3.38~3.58 GHz和7.29~8.13 GHz处均具有较好的阻带性质。     

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。     

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。     

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。     

一种新型超宽带双陷波平面单极子贴片天线设计

设计一种新型双陷波超宽带单极子贴片天线,辐射贴片为酒杯型天线结构,采用对底部边缘开槽曲流的办法,实现了良好超宽带天线性能。同时对辐射贴片加载了U形和C形缝隙,分别在3.5 GHz和5.5 GHz处产生陷波。利用HFSS软件对所设计天线进行仿真验证,仿真结果与实测结果表明,该天线在超宽带范围内能有效抑制双陷波能力,并且在通带范围有良好辐射和稳定增益特性。其天线尺寸为33 mmX26 mmX0.74 mm,便于集成在电路系统中。     

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...     

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。     

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。     

具有陷波特性的超宽带准自补天线设计

提出一种新型的微带馈电准自补天线,其辐射贴片由矩形和扇形金属片构成,并在地板上刻与辐射元互补的缝,天线整体尺寸为25 mm×32 mm×1 mm,为进一步展宽带宽,在馈电点下方的地板上挖去一个矩形缺口。仿真结果表明:驻波比小于2的带宽覆盖3.04~11.00 GHz,在整个工作频段有良好的辐射方向图。通过在馈线上嵌入U型槽,实现了对WLAN频段的陷波,而通带内仍可保持稳定的增益。     

一种小型平面超宽带天线的设计与实现

提出了一种新颖的小型平面超宽带天线。该天线由矩形微带天线的基本结构演变而来,为获得超宽带频率特性,设计时辐射单元下端采用了渐变结构,金属底板使用缺陷地结构。对天线的反射系数、方向图及增益进行了仿真计算和优化设计,实测结果为:天线的工作频段为3.1~13.0 GHz(S11<-10 dB),增益大于1 dB,具有良好的超宽带特性和全向辐射特性。     

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.     

Design of a novel sextuple band-notched UWB antenna

A novel sextuple band-notched UWB antenna was designed. Sextuple band-notched characteristics could be realized by adding a T-shaped stub, a bent stub, and etching a U-shaped slot on the patch, adding a C-shaped stub, an anti-C shaped stub near microstrip line and etching a pair of L-shaped slots on the ground plane,which effectively sup-presses the interference between narrow band systems and UWB systems. The influence of the proposed structures on band-notched characteristics was studied, and band-notched principle was explained by antenna surface current and equivalent circuit. Finally the antenna was fabricated and measured. The measured results of VSWR, radiation patterns and gains agree well with the simulated results, which demonstrates the correctness of the design method. The proposed antenna has good performance and can be widely used due to its sextuple band-notched characteristics.     

具有三阻带特性的新型平面超宽带天线研究

设计了一款具有三阻带特性的紧凑型超宽带天线。该天线采用共面波导结构进行馈电且能覆盖3.05~11.05 GHz的频率范围。通过在地表面加载两个对称的L形槽可以滤除WiMAX和卫星通信系统对超宽带系统的干扰,同时5.15~5.25 GHz和5.725~5.825 GHz的WLAN系统对超宽带系统的干扰分别被加载在辐射贴片上的倒C形和馈线上的倒U形槽滤除。天线经过设计,优化和制作,并对其进行了测试。测试结果表明,该天线尺寸为23mm×30 mm,其在3.05~11.05 GHz内VSWR小于2,并在3.30~4.16,5.0~5.4和5.6~6.0 GHz处形成了三个阻带。     

A new ultra-wideband fractal monopole antenna

The paper focuses on the peculiar dynamic behaviour of the recently developed 8 mm² TO-220-packaged, high-voltage, double-interdigitated (or rwo interdigi-tation levels—TIL) GTO thyristor. This novel power device was rated under both slightly and heavily inductive resistive loads, i.e. close to the real conditions encountered in practical power circuits employing GTO thyristors. Emphasis is laid on the ability of TIL GTOs to switch safely, with minimum power losses, a certain amount of anode current under high-voltage conditions and high commutation frequencies. The merits of TIL GTO thyristors are analysed in terms of their reliability and switching efficiency, which include the total power losses (conduction and switching losses), turn-on and turn-off gains and the switching speed. It is shown that thanks to their built-in self-protective features, these novel GTOs possess an enhanced current-handling capability at commutation frequencies up to 50kHz under extremely tough load conditions. The main implications of the results for power applications are outlined.     

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。     

An antipodal Vivaldi antenna with band-notched characteristics for ultra-wideband applications

An antipodal Vivaldi antenna (AVA) with band-notched characteristics is proposed in this paper for ultra-wideband (UWB) applications. For UWB systems, there will be some interference from the narrow band systems. The proposed antenna adopts resonant parallel strip (RPS) to reject an unwanted narrow band. It is easy to tune the RPS to eliminate the interference band. To validate this approach, a printed AVA with RPS is simulated and fabricated. From 2 to 9 GHz, the proposed antenna shows a good result with approximate 2:1 VSWR, an average gain of 6.5 dB, and stable radiation patterns except the notched band. At the center frequency of the notched band, the measured results show that the VSWR is more than 8:1, the realized gain is less than −10 dB and a messy radiation pattern is achieved. The simulated and measured results are in good agreement.