一种集总元件加载极端电小折叠单极子天线设计

针对无线通信等领域对电小天线的应用需求,设计了一种基于加载集总元件技术的极端电小折叠单极子天线结构。该天线在平面单极子天线的基础上,增加短路枝节拓展电流路径扩展带宽,采用集总元件加载技术,在辐射贴片上串联电阻元件增加输入电阻,并联电抗元件以改善输入电抗,实现了天线的极端电小特性。仿真表明,这种结构可以达到0.053λ×0.022λ×0.000 8λ(94 mm×40 mm×1.5 mm,λ为低频170 MHz处的波长)的极端电小尺寸,电压驻波比(Voltage Standing Wave Ratio, VSWR)在170～910 MHz时小于2,具有超宽带特性,并在工作频带内天线都具有良好的全向辐射特性。仿真分析了350 MHz、550 MHz、750 MHz三个频点处的方向图,且对应增益分别能达到-28.8 dBi、-16.7 dBi、-10.4 dBi。加工制作了该极端电小天线模型,实验测试验证了该天线的电小特性和超宽带特性,且方向图和增益测试结果均与仿真结果吻合良好。     

基于RLC集总加载的鞭状宽带天线设计

鞭状天线是中短波中应用最多的天线形式,其工作原理和有限导电平面上的单极天线相同,但单极天线的输入阻抗在3～30 MHz内变化剧烈,不能满足宽带发射要求.为了改善单极天线的带宽特性,可以采用多种方法展宽带宽,如加粗振子、采用多谐振形式以及沿振子线集总或分布加载等.设计一种基于无线链路控制层协议(Radio Link Co...     

小型化宽带宽波束四臂螺旋天线

文章提出一种应用于卫星移动通信系统的小型化宽带宽波束印刷四臂螺旋天线结构,每组辐射振子分成两个支路,分别以不同的长度、宽度和螺旋角度绕制以减少振子间的耦合、提高带宽。该天线的宽频带、宽波束能适用于卫星通信手持终端系统的应用。     

加载宽带天线分析

本文采用混合法分析了位于有限大地面上的加载天线，并计算其相关特性，结果表明，该类天线可得到良好的宽带特性。     

一种双频宽带天线设计

文中给出了一种双频宽带平面天线设计。该天线由矩形加载单极子,倒L形加载单极子和匹配网络组成,频带覆盖30MHz-88MHz、107MHz-500MHz,带内驻波比〈3,增益分别〉-22dBi和-10dBi。该天线具有宽频带、小型化和低剖面等特点,可以用作机载天线使用。     

一种宽带双极化共享折合臂天线设计

针对L、S波段双极化信号宽带监测,提出了一种宽带双极化共享折合臂（dual-polarized shared-folded-dipole,DPSFD）天线. 天线采用宽度渐变振子臂和共享折合枝节结构,这种设计使天线的相对带宽由原来的57.8%拓宽到85.7%,并改善了天线高频段方向图分裂的问题. 理论和实验测试表明:天线在1.6~4 GHz频带范围内,电压驻波比小于2,典型增益为8.3 dBi,天线尺寸仅为最低工作频率对应波长的28%. 新设计的天线可应用于通信信号宽带双极化监测系统中.     

一种新型小型化宽带无人机机载智能天线研究

随着无人机系统的发展,无人机无线链路需要具有智能波束跟踪能力的小型化宽带高增益定向波束实现无线连接与组网。以电抗加载理论为基础,研究一款机载电控无源阵列天线(ESPAR),为了实现宽带效果,中心部位馈电的主振子以单锥天线作为激励,以寄生单元高度、单元间间距和加载电抗参量为优化参量,经过参数扫描、筛选和优化,给出了仿真结果,并进行了样机制作,给出了测试结果,实现了机载智能天线的小型化与宽带化。     

一种小型化船用短波宽带天线

设计了一种新型小型化短波宽带接收天线,该天线工作频率为5MHz～15MHz,天线通过传输线变压器以及交叉螺旋天线等技术,有效的达到阻抗匹配,提高天线增益,使得天线总体高度控制在3m,非常适于舰载使用。     

小型化缝隙加载圆极化及宽带微带贴片天线设计

提出了一种十字形缝隙加载的小型宽带及圆极化微带贴片天线的设计方法。该天线通过在方形贴片上加载一个大尺寸的十字形缝隙实现天线的尺寸缩减,介质基片采用由FR4和空气层组成的层叠结构,在缝隙中嵌入L型枝节,只需通过调整枝节上同轴线馈电点的位置来获得圆极化或宽带阻抗匹配。ANSYS HFSS仿真分析表明,天线的圆极化带宽（AR≤3 dB）为1.7%,阻抗带宽（VSWR≤2）为5.8%,天线在宽带范围内具有稳定的增益,峰值增益为7.8 dB,同时贴片面积缩减了52.3%。改变馈电点的位置可调节两个谐振频率使天线阻抗带宽达到9.4%,比传统的微带贴片天线阻抗带宽提高了114%。     

并联介质加载折叠臂偶极天线的辐射特性

介绍了一种由折叠臂偶极天线和并联介质块组成的小型化超宽带天线。分析了天线的辐射机理,应用时域有限差分(FDTD)方法和完全匹配层(PML)技术对天线的辐射特性进行了研究。计算结果表明:驻波系数小于3时,天线的阻抗带宽达到2.4GHz(3~5.4GHz),并且辐射脉冲保形性较好,可用于无载波超宽带无线数据通信系统。     

Shorting pin loaded dual-band compact rectangular microstrip antenna

Theoretical and experimental investigations carried out on shorted microstrip patch antenna for dual band operation. The investigations were carried out by varying the shorting-pin position from the edge to the centre of the patch; such an antenna provides a frequency tunability range from 0.88?GHz to 1.08?GHz for first resonance and from 2.20?GHz to 2.59?GHz for second resonance. A frequency ratio of about 2.91 to 2.2 for the two operating frequencies is observed. When the shorting-pin position is close to centre or at the centre of the patch, a single resonant frequency is observed. It is also observed that the resonant frequency of the antenna heavily depends upon the thickness of the substrate, dielectric constant of the substrate and radius of the shorting-pin.     

宽频带盘锥天线的研究与设计

设计了一款工作于700MHz～3GHz的宽频带盘锥天线。在参考现有文献得出盘锥初始模型的基础上,通过高频电磁场仿真软件HFSS对各参数进行参数优化仿真,最终得出最佳值。该天线在700MHz～3GHz的频段内VSWR<2,H面辐射方向图具有全向性,并最终通过仿真和实测验证了其性能。     

小型化准分形加载单极子天线

提出了一种小型化宽带加载单极子天线,即对有顶部加载的单极子天线进行准分形和RLC集总加载.研究表明准分形可以有效地降低天线的谐振频率,提高辐射能力.准分形加载单极子天线和三维分形树单极子天线相比,结构非常简单,容易实现,和典型的加载单极子天线相比,天线的电尺寸要小得多.对准分形加载单极子模型天线进行了测试,实测结果和仿真结果比较一致.加入匹配网络后,可得到10:1的带宽.     

一种小型半U型缝折叠超宽带微带天线

提出了一种四分之一波长半U型缝隙折叠超宽带微带天线。该天线采用短路面加载半U型缝隙以及折叠辐射贴片的方法,实现了小型超宽带特性;天线的尺寸为18mm×7.5 mm×7mm,相对波长尺寸为0.231λg×0.096λg×0.09λg(λg是天线带宽最低频率对应的介质中波长)。仿真显示,天线的阻抗带宽为39.3%,仿真辐射方向图稳定,平均增益4.3 dB。由矢量网络适量分析仪E5071C实测天线模型,天线的带宽为3.86～6.47 GHz,相对带宽为50.53%,并且从3.53 GHz到大于8.5 GHz频段上电压驻波比小于3,相对带宽超过82.6%。     

A wideband on-chip millimeter-wave patch antenna in 0.18/Lm CMOS

A wideband on-chip millimeter-wave patch antenna in 0.18 μm CMOS with a low-resistivity （10 Ω.cm） silicon substrate is presented. The wideband is achieved by reducing the Q factor and exciting the high-order radiation modes with size optimization. The antenna uses an on-chip top layer metal as the patch and a probe station as the ground plane. The on-chip ground plane is connected to the probe station using the inner connection structure of the probe station for better performance. The simulated S11 is less than -10 dB over 46-95 GHz, which is well matched with the measured results over the available 40-67 GHz frequency range from our measurement equipment. A maximum gain of-5.55 dBi with 4% radiation efficiency at a 60 GHz point is also achieved based on Ansofi HFSS simulation. Compared with the current state-of-the-art devices, the presented antenna achieves a wider bandwidth and could be used in wideband millimeter-wave communication and image applications.     

一种开双H形槽的新型宽频微带天线

提出了一种在接地板和辐射贴片同时开H形槽的新型宽频微带天线。设计了一个工作于Ku波段的微带天线。采用时域有限差分（FDTD）方法对该天线的电特性进行了仿真计算,并制作了实验模型。测量结果表明,该天线驻波（VSWR）小于2的相对阻抗带宽达到了37．6％,交叉极化电平小于-17dB。     

探地雷达阻性加载天线的应用研究

阻性加载技术可以有效拓展天线带宽、降低时域振铃.该文以双纽线构成平面印制天线的辐射臂, 分析阻性加载对其频域和时域特性的影响.通过数值仿真, 讨论了天线在两种阻性加载方式下阻抗带宽和时域波形的变化.设计了一款指数型微带转平行双线的巴伦, 并对巴伦和天线进行了加工及测试.测量结果表明, 天线时域波形拖尾振铃小于10%;在0.8~6 GHz频带内, 天线单元回波损耗小于-10 dB.将天线与雷达收发系统集成后, 进行地下目标探测实验.雷达探测结果成像清晰、浅层目标分辨率较高.该天线具有超宽带、低振铃、紧支撑等特点, 可满足便携式探地雷达的工程化应用需求.     

基于新时域算法的集总加载线天线的耦合分析

在电磁工程应用中, 天线通过加载, 可以缩短天线尺寸, 实现小型化设计.文中提出了网格内置集总元件的时域有限差分(Finite Difference Time Domain, FDTD)处理新方法, 将细导线FDTD与集总元件FDTD结合起来, 模拟了强电磁脉冲对集总加载线天线的耦合, 能够快速计算得到天线上耦合的电流响应.通过与有限积分法软件的仿真结果进行对比, 验证了混合算法的正确性.在此基础上, 分析了入射电磁脉冲的类型以及脉冲宽度对天线上电流响应的影响, 为天线进行前门防护设计提供理论依据.     

SRR and S-shape slot loaded triple band notched UWB antenna

This paper demonstrates the design of a triple band notched ultrawideband circular microstrip patch antenna loaded with Complementary Split RingResonator (CSRR) and S-shaped slot in microstrip feed line. Complementary Split Ring Resonator slot and S-shaped slot are used to produce band notched characteristics for WiMAX band (3.30–3.60 GHz) and WLAN band (5.10–5.80 GHz) respectively. The downlink frequency band (7.25–7.75 GHz) of X-band for satellite communication is notched using Symmetrical Split Ring Resonator Pair (SSRRP) as electromagnetic coupling element near microstrip feed line which produces band stop characteristics. Measured results of fabricated antenna prototype are compared with simulated results and found in correspondence. The VSWR and vector current plots show evidence of the significant suppression in the desired frequency bands.     

Elliptical slot loaded partially segmented circular monopole antenna for super wideband application

This article inspects partially segmented circular monopole with elliptical slot for super wideband applications. Two significant characteristics of proposed antenna design are: (i) partially segmented circular monopole, notch loaded elliptical ground plane along with tapered microstrip line provides super wide bandwidth; (ii) elliptical slot in between the partially segmented circular monopole reduces the lower operating frequency (1.07 GHz–0.96 GHz), which in turn enhance the bandwidth dimension ratio (BDR). For verifying the simulated outcomes, antenna prototype is practically constructed and measured. The proposed antenna design attains frequency range from 0.96 GHz to 10.9 GHz (VSWR < 2) with bandwidth ratio of 11.35:1 and percentage bandwidth of 167.22%. Bandwidth dimension ratio of proposed radiator is 6975.22. Frequency as well as time domain analysis of proposed radiator approves its applicability for super wideband wireless applications.