共面波导-槽线馈电的引向天线

在对现有印刷形式的引向天线进行简单分析之后,文章提出了一种共面波导-槽线馈电的引向天线的设计方法。通过对共面波导-槽线馈电网络的馈电端口阻抗的仿真计算,解释了天线的带宽特性;在对有源振子和引向器的表面电流的仿真基础上,建立了该天线的三元对称振子阵列的辐射模型,该模型很好地解释了天线的定向辐射特性。仿真和实验结果表明,所设计的天线是一种性能良好的小型宽带定向天线。     

紧凑型共面波导馈电的超宽带印刷天线设计

针对超宽带天线设计的重要性,基于微带天线和电磁散射理论,设计和分析了一种新的紧凑型共面波导反馈超宽带印刷天线。天线采用逆L型和U型非对称的辐射单元结构,以便最大程度地展宽天线带宽。与以往所提出的共面波导馈电天线相比,该天线具有尺寸小、近线性阻抗、高增益、宽频带、准全向性辐射模式和低成本等特点。并且,该天线的主要性能参数达到了一个较好的平衡。仿真和测量结果保持一致。该天线能满足多种宽带无线通信应用的要求。     

一种基于遗传算法的超宽带天线自动设计方法

提出了一种基于遗传算法的超宽带天线的自动设计方法,并利用此方法设计了一种紧凑型共面波导馈电超宽带天线。所设计的天线采用印刷电路板上的共面波导(CPW)进行馈电,利用遗传算法对天线的贴片形状轮廓进行自动化设计和优化,最后得到一种新颖的UWB 印刷缝隙天线。天线尺寸为32mm′32mm′0. 787mm。仿真结果和实验结果表现出良好的一致性。实验结果表明,该天线在2. 89 ~12. 6GHz 的频段内电压驻波比小于2,在整个UWB 工作频段范围内有稳定的增益和良好的辐射方向特性。     

一种新型双频圆极化微带缝隙天线的设计

提出了一种新型的弹载通信天线结构。采用微带天线结构,通过缝隙加载和共面波导馈电结构,得到宽带小型化天线辐射单元。该天线具有良好的 E 面全向特性和宽带特性,并且结构紧凑、馈电简单、带宽较宽、易于制造。     

共面波导(CPW)馈电单极子天线的设计与研究

给出一种工作于900MHz的共面波导(CPW)馈电单极子天线的设计。该单极子天线以共面波导的中心导带为辐射单极子，以中心导带两边的金属导体作反射板，结构简单紧凑。但是由于天线与共面波导之间缺少有效的隔离，造成天线性能受共面波导尺寸的影响较严重。本文通过模拟计算和实验测量详细分析了共面波导尺寸的变化对天线性能的影响，给出了结合共面波导尺寸设计的工作在900MHz的单极子天线结构数据。     

一种新型弹载遥测通信天线的设计

为满足因信道容量的扩充而产生的对通信天线更宽频带的需求,提出了一种新型的弹载通信天线结构。采用微带天线结构,通过缝隙加载和共面波导馈电结构,得到宽带小型化天线辐射单元。该天线具有良好的E面全向特性和宽带特性,并且结构紧凑、馈电简单、带宽较宽、易于制造。     

一种用于WLAN的小型双频宽带印刷单极天线

设计了一种满足WLAN双频工作所需的小型共面波导馈电的双频宽带印刷单极子天线单元.该单极子天线的设计采用了在倒锥形单极天线顶部添加半圈矩形螺旋枝节的结构,使其获得了小型化和双频宽带的性能.采用基于共面波导的馈电方式,天线单元具备宽带匹配、结构简单、制作方便和易与其它无线通信设备集成等优点.仿真和实测结果表明,设计的天线单元在WLAN应用的高、低频段上10dB阻抗带宽分别约为2100MHz(4.52～6.62GHz,约37.7%)和220MHz(2.27～2.49GHz,约9.2%),增益在2～3dBi之间;在相应工作点辐射波瓣图上全向性较好.该天线能满足WLAN应用所需,具有较高的工程应用价值.     

共面波导馈电的新型微带缝隙天线

本文介绍一种共面波导馈电的新型微带缝隙天线。通过选择正方形缝隙形状和对共面波导与辐射缝隙的连接区域进行渐变，有效地展宽了缝隙天线的阻抗带宽，实验天线的-10dB反射损失带宽达40％。文中对不同渐变形式下的天线特性进行了研究。仿真结果与实测结果吻合良好。     

X波段共面波导结构串馈天线的设计

介绍了共面波导天线的辐射原理,在此基础上依据串馈天线理论设计出一种共面波导结构的串馈天线。天线辐射单元由6个微带单元串接组成,辐射单元与上地面之间的缝隙为恒定值,各个辐射单元的辐射系数由泰勒加权法确定,各个辐射单元的辐射能量逐次递减。经仿真计算回波损耗小于15 dB时,天线带宽为260 MHz(10.45~10.71 GHz),天线辐射主瓣与最大旁瓣差大于16.5 dB,天线的辐射效率为69%。     

具有双陷波功能的超宽带天线设计

提出了一种具有双陷波特性的共面波导馈电的超宽带天线。该天线的结构类似于一般的单极子天线,辐射体采用双环形结构,馈电部分由共面波导来实现,具有良好的宽带阻抗匹配特性。通过在辐射体和馈电部分分别嵌入不同形状的缝隙,使得天线在(3.2~3.6 GHz和5~6 GHz)出现频带阻断,并且天线在通带内呈现良好辐射的特性。     

小型化超宽带印刷单极子天线

该文提出一种小型化超宽带印刷单极子天线,阻抗带宽为3．17～50GHz。该天线采用圆彤单板子为辐射结构,利用共而波导馈电方式．天线的尺寸为30×32×1．6mm,通过适当地调整板尺寸和阋形辐射单元的半径,可以使天线得到很好的阻抗匹配。与以往的天线相比,带宽更宽,尺寸更小,天线具有良好的辐射性能,达到了小型化的婪求．可为将来的超宽带通信应用提供良好的选择。     

超导共面波导谐振腔稳频振荡器的实验研究

对共面波导谐振腔稳频振荡器进行了实验研究。在对不加谐振腔的简单振荡器研究的基础上，设计并制作了反馈型和传输型谐振腔稳频振荡器。首先，稳频谐振腔分别用常规导体介质基片和在ＺｒＯ衬底上的金膜来实现。然后，用ＬａＡｌＯ３介质衬底上的ＹＢＣＯ超导薄膜制作的共面波导稳频谐振腔嵌入振荡器电路，利用其高品质因数取得较好的稳频效果。所有电路的有源器件均采用ＮＥ７２０８４ＧａＡｓＭＥＳＦＥＴ。     

CPW fed active dipole antenna for television receivers

A coplanar waveguide fed active dipole antenna for a television receiver is fabricated on a thin dielectric film by using photoetching techniques. A transistor amplifier is integrated between the feeding point of the dipole and CPW. Actual gains of more than 8 dBd are obtained at frequencies from 470 to 770 MHz     

Coplanar waveguide-fed slot antennas on cylindrical substrates

This paper describes cylindrical coplanar waveguide (CCPW)-fed slot and folded slot antennas encompassing cylindrical substrates. Using a 1.27 cm diameter Teflon substrate, antennas that operate around 7 GHz have been realized with gains of 1.5 dB (slot) and 2.8 dB (folded slot). The antennas have a well-defined pattern null of 8 dB along the side of the CCPW feedline. A 1.6 GHz slot antenna on a 1.27 cm diameter alumina substrate was also fabricated using a novel direct-write technique, and shown to have comparable performance characteristics.The results include measured data and simulated data using a 3D cylindrical finite difference time domain (FDTD) code.     

Printed dipoles electromagnetically coupled to coplanar waveguide for linear or circular polarisation

Two configurations are proposed for feeding printed dipoles with coplanar waveguide transmission lines. The coplanar waveguide feed is printed on a ground plane sandwiched between a high-permittivity substrate and a low-permittivity substrate which supports the antenna. Both linear and circular polarisation can be achieved. Measured results are presented.     

Dual-band printed dipole antenna with parasitic element for WiMAX applications

Recently, wireless communication has grown exponentially worldwide. The wireless system that is currently popular is the Worldwide Interoperability for Microwave Access (WiMAX) system, which operates in the 2.5?2.7, 3.3?3.8 and 5.2?5.8 GHz frequency bands; the standard that defines interoperability across these bands is IEEE 802.16a/d/e/2004 [1]. Because of this, broadband and multiband antenna designs have become important in wireless applications. Recently, various antenna designs such as those of microstrip line, coplanar waveguide, and PIFA dipole antennas have been presented in the literature. In [2], a novel miniature end-loaded planar open-sleeve dipole (ELPOSD) antenna was presented; it was demonstrated to have a large bandwidth and a short length. A printed dipole antenna with U-slotted arms was proposed in [3]. With the aid of an embedded U-shaped slot, it can generate a new resonant mode at 5.2 GHz. In [4, 5], printed dipole and monopole antennas with parasitic elements were presented. The experimental results show that parasitic strips can be coupled with dipole antennas in order to give rise to additional resonance modes. A broadband printed dipole antenna with a stepshaped feed gap was proposed in [6]. The wide operating band is controlled by the different lengths of the radiation arms. Thus, it was demonstrated that a dipole antenna with parasitic elements has the ability to realise multiband or broadband operation.     

新型圆环嵌套多频印刷天线

提出了一种具有多频特点的新型圆环嵌套印刷天线,该天线由不同直径的圆环嵌套得到。通过电磁仿真软件CST Microwave Studip进行仿真研究,结果表明嵌套圆环的外径、宽度和嵌套数目可以对其通频带中心频率、频带宽度和通频带数目进行控制。设计出了具有2．4GHz,3．5GHz,5．2GHz,5．8GHz四个通频带的共面波导馈电的单极印刷天线和以平衡微带线馈电的对称振子天线。制作了天线实物并在微波暗室中进行测试,测试结果与仿真吻合较好,该天线具有近似独立的频率可控性和较小的尺寸,可用于WLAN和WiMAX等领域。     

CAD modeling of coplanar waveguide (CPW) air-bridges

In this paper, first, a comprehensive review of existing models for the coplanar waveguide (CPW) air-bridge is presented. Then, a new CAD model is proposed, in which the bridge is modeled as a small section of a microshield line, whose characteristics are obtained using the conformal mapping technique. Our results are in good agreement with full-wave results.     

共面波导馈电折叠缝隙对数周期天线的研究

超宽带天线是宽带电子系统中的关键部件。本文开展了折叠缝隙对数周期天线的电磁仿真和性能实验研究。根据对数周期偶极子天线的基本原理,设计了共面波导馈电的折叠缝隙对数周期天线。采用在折叠缝隙对数周期天线的折叠缝隙单元中加载相位槽的方法,进一步改善了天线低频端的驻波特性。对相位槽加载的折叠缝隙对数周期天线进行加工测试,测试结果表明在2 GHz~18 GHz的阻抗带宽内,驻波比小于3.5,与仿真结果吻合良好。设计了基于相位槽加载的共形LPFSA,给出了具体的仿真结果。本文的研究工作为该天线的实际应用提供了技术参考。     

共面波导馈电宽带矩形边蝶形缝隙天线的仿真分析与设计

对一种共面波导馈电的宽带缝隙天线进行了仿真分析。着重研究了共面波导馈线各参数的变化对天线阻抗性能的影响,总结出了相应的规律和参数选取准则。根据分析结果,给出了合理调节共面波导馈线的参数以提高缝隙天线的阻抗性能的方法,并利用所得到的变化规律,给出了该天线的一种宽频带设计方案。