一种新型的宽频带双极化微带偶极子天线

根据通信行业标准,从工程应用角度出发,文章提出了一种新型的宽频带双极化微带偶极子天线,并应用HFSS11对天线性能进行仿真。仿真结果显示,在1.7GHz～2.7GHz频段内,天线VSWR〈1.3,隔离度小于-29dB,交叉极化比小于-15dB,具有较为稳定的方向图。     

一种宽频宽角圆极化一维相扫天线阵

基于改进型Vivaldi天线单元,采用4单元十字交叉组合构成圆极化天线,并通过增加耦合金属立柱改善天线轴比,设计了一种超宽频宽角覆盖圆极化直线阵。该天线在1.25-4.1 GHz频段电压驻波比(VSWR)小于2,在1.6-3.6 GHz频段轴比小于3 dB,在垂直扫描方向具备宽角覆盖能力,具备较高的工程应用价值。     

一款面向5G微基站的双频双极化电磁偶极子天线的设计与分析

小型化是进行5G微基站天线设计的重要考虑因素,文中设计了一款适用于5G微基站的电磁偶极子天线. 天线由一对正交放置的单极化电磁偶极子、一对交叉放置的渐变式Γ形馈电线、一个圆形寄生贴片和一块正方形反射板组成,工作频段为2.50~3.62 GHz和4.8~5.0 GHz,能够覆盖工信部规定的5G的全部中频段. 在工作频带内,天线的输入回波损耗小于?10 dB;端口隔离度在低频段小于?25 dB,在高频段小于?42 dB;仿真平均增益在高、低频部分分别为5.57 dBi和9.84 dBi. 该天线能够实现双频段和双极化,可以作为小型化微基站天线设计的参考,同时为5G天线的商用化提供参考.     

一种新型UWB平面单极子微带天线阵的设计

提出了一种新型平面单极子微带天线阵,以平面矩形单极子天线为原型,通过改变辐射贴片的形状实现对原有天线性能的优化。设计了中心频率为2.4 GHz,相对带宽是42%,增益达13 dBi的宽频带四单元平面单极天线阵。通过仿真与实验表明,该天线在1.93 GHz~2.93 GHz频带内反射系数均小于-10 dB。     

一种2.45GHz圆极化二元微带天线阵列

本文设计了一种2.45GHz二元圆极化微带天线阵列,天线单元采用开槽的圆形贴片形式.测试结果表明:在工作频段内,其仿真和测试结果吻合,回波损耗为-23.01dB,相对带宽为9.8%(VSWR 2),方向图良好,增益大于12dB.     

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。     

基于超表面的超宽带低剖面双极化天线

提出了一款基于超表面的超宽带低剖面双极化天线。该天线由2对垂直放置的偶极子和超表面阵列组成。由于采用双极化形式,能够引入附加的谐振点,从而拓展了天线的带宽。为了实现低剖面特性,偶极子天线加载了具有同相反射相位的超表面阵列。此外,通过超表面阵列的切角设计,改善高频段的电压驻波比和辐射方向图。该天线剖面高度仅为38 mm(0.1λ),在0.81~2.35 GHz(97.4%)频带内,电压驻波比(VSWR)小于2,端口隔离度大于15 dB,增益为5~11 dBi。     

一种新型布局的圆极化微带天线阵优化设计

提出了一款高增益低副瓣新型圆极化微带天线阵。单元天线采用叠层切角圆极化微带结构,通过八边形边界布局和顺序旋转交叠组阵技术,实现了天线阵方向性图的对称性和圆极化辐射性能的最优化;馈电网络采用威尔金森功分器和最大平坦式阻抗变换器实现不等功分宽带阻抗匹配,通过改进馈电方向寻求对称结构,简化了馈电网络的设计。制作了天线阵实物并进行了测量。测试结果表明:天线在3.2~4.6 GHz频段内S₁₁<-10 dB,阻抗相对带宽36%;在3.8~4.5 GHz频段内顶点轴比小于3 dB,圆极化相对带宽17%;在4~4.4 GHz频段内天线增益均在15 dB以上,最高增益达17 dB。     

一种应用于RFID 的印刷倒F 天线设计

基于平面倒F 天线模型,设计了一种用于2.4GHz RFID 系统的印刷倒F 单极子天线。采用易于射频集成的微带馈电方式,并结合带线阻抗变换,以实现较宽的阻抗带宽;采用在印刷倒F 结构正上方加载寄生辐射贴片,以提高天线增益。利用高频电磁仿真软件Ansoft HFSS 对提出的天线进行了建模、仿真和优化设计,该天线在2.28-2.51GHz 频率 范围内VSWR＜2,达到了10%左右的阻抗带宽,特别在RFID 系统的工作频段内（2.401GHz~2.409GHz）VSWR＜1.35, 增益＞2.36dBi。该天线具有尺寸小,重量轻,成本低等众多优点,能应用于工作于2.4GHz 的各种RFID 系统中。     

一种复合左右手结构的高扫描率微带漏波天线北大核心CSCD

提出了一种新型复合左右手结构微带漏波天线,利用超材料的左手特性消除开路阻带效应、曲折线单元在纵轴上的垂直偏移提高天线增益以及调节群时延法提高天线的扫描率。采用全波分析法分析了天线的阻抗带宽和辐射特性,实测结果表明在9.7~11.45 GHz工作频段内,天线的回波损耗小于-10 dB,当频率从9.7 GHz变化到11.1 GHz时,主波束可以从-50°到+31°进行电子扫描且增益均大于9.8 dB。该天线具有高增益、高扫描率和小型化的优点,可以应用于轻质机载频扫雷达系统中。     

Design of wideband dual-band dual-polarized dipole for base station antenna

This article put forward a novel dual-band dual-polarized magneto-electric dipole antenna excited by F-shaped strips. The proposed antenna achieved a common impedance bandwidth of 25.5% and 39.5% in the lower and the upper bands at both input ports, ranged from 0.75 GHz to 0.97 GHz and from 1.73 GHz to 2.59 GHz respectively. The antenna has good performance in isolation, which is more than ?32 dB between the two input ports, and the gain of the antenna is average 4.3 dB and 7.8 dB in the lower and upper bands. The antenna has a stable broadside radiation pattern with low cross polarization and low back lobe radiation over the operating band. Metallic side walls on the ground are added for better performance in gain and radiation pattern.     

一种基于5G应用的圆极化微带相控阵天线

本文提出一款应用于5G频段,可实现方位面±40°波束扫描的圆极化微带相控阵天线。该相控阵天线单元是由矩形贴片、上下介质板、缝隙耦合馈电结构、金属反射板构成。利用切比雪夫综合法的一分八不等分功分器实现相控阵天线的馈电形式。测试结果表明,阵列天线的驻波比带宽为3.25 GHz～3.69 GHz,端口隔离度大于25 dB,扫描过程中增益最大为21 dB,增益衰落小于3 dB,最大扫描角处轴比为2.89 dB。该天线具有低剖面、高隔离度、高增益以及良好的波束扫描性能等优点。     

Ka频段宽带双口双模馈源设计

针对卡塞格伦天线系统对馈源的要求,设计了一种Ka频段双口双模馈源,可与X频段馈源组合成体积较小的双频段馈源。采用圆环状的和差比较器结构,降低了双频段馈源的体积,通过添加过渡阶梯、圆柱销钉与金属调配板等设计,改善了双频段馈源的性能。测试结果表明,在绝对带宽2 GHz范围内,S和口、E差口与H差口驻波比均小于2,3个端口间的隔离度均大于25 dB。测试频率的和方向图在±60°时的归一化增益均在-14~-20 dB范围内,初级归一化和方向图的对称性较理想,差方向图的零值深度均小于-25 dB,满足卡塞格伦天线对馈源设计的指标要求。     

Construction technique and performance of a 2 GHz rectangularcorrugated horn

A large rectangular horn antenna with a center frequency of 2.0 GHz, corrugated on the E-plane walls, made out of aluminium sheet, has been designed, constructed, and tested. A technique has been developed to solder thin aluminium strips onto the back plane to form the corrugations. The radiation beam pattern shows half-power beamwidths of 12° and 14° in the H- and E-planes, respectively, and sidelobe response below -40 dB at angles greater than 50° from the horn axis. The measured return loss is greater than 20 dB (VSWR<1.22) between 1.7 and 2.3 GHz; insertion loss is less than 0.15 dB     

Design of Dual‐Band MIMO Antenna with High Isolation for WLAN Mobile Terminal

In this paper, we propose a dual‐band multiple‐input multiple‐output (MIMO) antenna with high isolation for WLAN applications (2.45 GHz and 5.2 GHz). The proposed antenna is composed of a mobile communication terminal board, eight radiators, a coaxial feed line, and slots for isolation. The measured ?10 dB impedance bandwidths are 10.1% (2.35 GHz to 2.6 GHz) and 3.85% (5.1 GHz to 5.3 GHz) at each frequency band. The proposed four‐element MIMO antenna has an isolation of better than 35 dB at 2.45 GHz and 45 dB at 5.2 GHz between each element. The antenna gain is 3.2 dBi at 2.45 GHz and 4.2 dBi at 5.2 GHz.     

Ku 波段口径耦合宽带双极化微带天线

本文综合运用双层贴片和口径耦合馈电拓展了微带天线的带宽,设计了一个工作在Ku 波段的宽频带双极化 微带天线。利用在架高层介质上开腔体的方法实现对于寄生贴片的架高,既能有效降低天线成本,又可实现较低的等 效介电常数。基于这种双极化单元组成了一个2×2 的微带天线阵列,仿真结果表明两端口分别拥有20.5%和20.1%的 阻抗带宽,两端口隔离度大于31dB,水平极化和垂直极化的极化隔离大于41dB 和46dB。     

A Planar UWB Diversity Antenna

A planar dual-port diversity antenna, operating with broadside and/or conical radiation patterns in H-planes, is presented for ultrawideband (UWB) applications. The proposed antenna consists of a suspended square patch with a thick stem underneath. A broadband differential feeding strip is used to feed the square patch. The measured gain for the broadside mode is 8.4–10.3 dBi from 3.1 GHz to 5.2 GHz (50.6%), and the conical mode 3.2–5.1 dBi from 3.1 GHz to 4.9 GHz (45%). The measured reflection coefficients $(vert S _{11} vert, vert S _{22} vert)$ are less than -10 dB over the frequency ranges and the isolation $vert S _{21} vert $ between the two ports is greater than 13.5 dB. The operation of the differential feeding strip on the antenna is discussed. Both pattern diversity and partial polarization diversity are achieved for this antenna.      

A High-gain Wideband Antenna with Double Fabry-perot Cavities

A high-gain wideband antenna, using the electromagnetic resonances of double Fabry-Perot (F-P) cavities, is proposed. The two cavities are excited by a patch antenna placed in the cavities on top of the ground plane. One of the double F-P cavities is formed by a ground plane and a single metallic strips array, and the other consists of the patch and the metallic strips array. The two F-P cavities have different resonance points which yield the frequency bandwidth of 7% between 13.0 and 14 GHz with S₁₁?≤?10 dB, meanwhile, in this frequency region high gain is also obtained. Moreover, the center frequency and bandwidth could be adjusted by changing the cavity length. The high-gain wideband antenna was manufactured and measured. The measured VSWR is less than 2 from 13.3 GHz to 15.2 GHz, the measured gain is 13.5 dB at 13.5 GHz. In addition to that, a considerable improvement of 7 dB in terms of gain is obtained when compared to the same antenna without metallic strips.     

双频水平极化全向天线设计

分析并设计了一种双频水平极化全向天线,该天线采用印刷偶极子组阵形式实现全向辐射性能,采用双辐射臂形式以及梯形渐变线馈电,实现在2.4~2.5 GHz和5.1~5.9 GHz上回波损耗低于-10 dB的双频特性。低频增益1.2 dB,不圆度为0.2 dB;高频增益2.4 dB,不圆度为2 dB。该天线结构简单,拥有良好的全向性。     

Dual-polarised single-layer slotted patch antenna

A compact design of the single-layer slotted microstrip patch antenna is presented, which has two highly decoupled orthogonal input ports and is capable of generating dual-polarised radiation. The proposed antenna displays a desired characteristic for reducing polarisation loss between the transmitting and receiving antenna units at arbitrary angles. The measured results show that the proposed antenna with resonance frequency at 5.93 GHz has a bandwidth of about 300 MHz, an average gain of greater than 8 dBi, and an input isolation of exceeding 20 dB for the entire impedance bandwidths of the two polarisations.