Miniaturized multi-band antenna using deformed splot ring resonator

A 48 mm x 60 mm x 1 mm miniaturized multi band antenna based on deformed split ring re sonators was presented. The antenna was consisted of a micro strip line and a deformed split square ring. Its/S11/parameters were determined through numerical simulation and experimental measure ment within three working bands of 2.6 GHz to 3. 0 GHz, 3. 9 GHz to 4. 4 GHz and 5.2 GHz to 5. 8 GHz and the results showed that the parameters within all the bands were less than 10 dB. The gain at every frequency for the antenna was above 2.2 dB and it increased monotonously with the frequency from 5. 5 GHz to 7. 0 GHz.

Design of multi-band metasurface antenna array with low RCS performance

In this paper, a multi-band metasurface（MS） antenna array with low radar cross section（RCS） performance is proposed and measured. Firstly, a 44 antenna array is composed of four 22 Jerusalem cross structure antenna arrays working at different frequency bands, which is aimed at enhancing the bandwidth effectively. Then, each antenna can be seen as a unit of MS in spite of adding the feeding structure. Based on phase cancellation principle, the MS is arranged into a chessboard configuration in order to realize wideband RCS reduction. Thus, excellent radiation and scattering characteristics are obtained simultaneously. Simulated and measured results indicate that this work provides a novel method to achieve bandwidth expansion as well as wideband RCS reduction of the antenna array.

Novel dual-band antenna for multi-mode GNSS applications

A novel dual-band antenna is proposed for mitigating the multi-path interference in the global navigation satellite system（GNSS） applications. The radiation patches consist of a shortedannular-ring reduced-surface-wave（SAR-RSW） element and an inverted-shorted-annular-ring reduced-surface-wave（ISAR-RSW）element. One key feature of the design is the proximity-coupled probe feeds to increase impedance bandwidth. The other is the defected ground structure band rejection filters to suppress the interaction effect between the SAR-RSW and the ISAR-RSW elements. In addition, trans-directional couplers are used to obtain tight coupling. Measurement results indicate that the antenna has a larger than 10 d B return loss bandwidth and a less than 3 d B axial-ratio（AR） bandwidth in the range of（1.164 – 1.255） GHz and（1.552 – 1.610） GHz. The gain of the passive antenna in the whole operating band is more than 7 d Bi.

Multi-Band Antenna with Three Folded Monopoles for Mobile Communication Systems

This paper presents the design and the experimental characterization of a new multi-band antenna consisting of three folded monopoles dedicated to mobile communication systems. The originality of this paper is to get the PMR (Professional or Private Mobile Radio) band with the GSM (Global System for Mobile Communications), DCS (Digital Cellular System) and UMTS (Universal Mobile Telecommunications System) bands. The main lobe of the antenna radiates in the zenith direction with a linear polarization over all bands. It is interesting to design the proposed antenna in order to obtain better performances in terms of directive radiation pattern (especially in the PMR band) in comparison with the already existing antenna systems in the wireless market for similar purposes. The prototype was studied with the software CST-MWS (Micro wave studio 2012). The antenna has been designed and successfully measured.

Multi-Band Rectangular Patch End-Fire Antenna Array

A novel multi-band end-fire antenna array was designed, fabricated, and characterized. Analytical calculations were carried out to determine the critical antenna dimensions and the design was optimized using a 3D electromagnetic finite-element solver. The measured results were in good agreement with the designed results. The proposed antenna array exhibits multi-band capabilities which can be potentially used for applications that require a multi-band end-fire radiation pattern.

N Design of an H-shaped Slot Multi-frequency Microstrip Antenna

Conventional slot microstrip antenna is analyzed,an h-shaped multi-frequency and miniaturization slot microstrip antenna is proposed.Numerical simulation is performed for the characteristics of the antenna with the software HFSS11.0,which is a kind of simulation software based on Finite Element Method,the simulation results shown that the antenna operated at 2.26~2.42GHz,2.67~2.82GHz,4.28~4.39GHz and 5.76~5.89GHz when the return loss S11<-10dB,the size reduced compare to general microstrip antenna,demonstrated the effectiveness of the design scheme.The antenna structure is simple and easily to be implemented,met the wireless LAN 802.11a/b/g/n mobile terminal antenna miniaturization and multi-band requirements.

Tri-Band Fractal Antennas for RFID Applications

The RFID is a rapidly developing technology. It’s used in many applications such as logistics, ticketing, security, employee attendance record and others. Also, fractal technology is used in many areas, and recently in antenna design because it allows making multi-band and wide-band antennas. In this paper, two tri-band fractal antennas are studied for the Radio Frequency Identification (RFID) applications using the Method of Moment (MoM). The first one is designed for the RFID readers and it operates at 3.85 GHZ, 5.80 GHZ and 8.12 GHZ. The second one is designed for the RFID Tags and it operates at 3.94 GHZ, 5.65 GHZ and 8.20 GHZ.

Ka频段卫通收发共口径多波束相控阵封装天线设计

为满足卫星通信中双频共口径、高集成、多波束等要求,提出了一种基于封装天线(Antenna in Package, AIP)架构的Ka频段收发共口径多波束相控阵天线。天线以双频堆叠微带单元的形式实现了收发共口径,并通过天线集成滤波器保证了收发通道的隔离度优于44 dB。在±60°范围内,64元接收阵增益优于17.4 dB,128元发射阵增益优于20.2 dB,具有良好的波束扫描性能。为获得收发多波束一片式集成,在收发(Transmitter/Receiver, T/R)组件中使用晶圆级三维系统集成封装(Three Dimensions System in Package, 3D-SIP)并结合微凸点的制备技术,保证了系统级芯片(System-on-Chip, SOC)的高密度二次集成。高低频混压技术同样被应用于阵面、收发网络、控制供电链路的多层板集成。所提多波束的相控阵天线新架构具有高密度集成TR组件、多波束一体化、高效散热等特点,在卫星通信和数据链等方面具有广阔的应用前景。

采用螺旋线实现高隔离度的车载多频宽带MIMO天线

为解决车载天线工作带宽窄和MIMO天线低频段隔离度低等问题,提出一种应用于车载通信系统的多频宽带高隔离度的MIMO天线,其工作频段为824~960 MHz和1710~6000 MHz,可覆盖民用移动通信的2G/3G/4G/5G和无线局域网/车联网等频段。单极子天线单元采用弯曲、开槽等诸多技术实现多频宽带,还通过添加接地枝节来降低天线高度和提高物理稳定性;在MIMO天线设计上采用螺旋线来提高天线单元之间的隔离度。实测结果表明,天线在工作频段内的反射系数小于-10 dB,隔离度小于-20 dB,低频段增益和辐射效率略低,中高频段的增益均大于4 dBi,最高达到7 dBi,效率均高于70%,最高可以达到96%。实测数据与仿真数据具有良好的一致性,所研制的天线可满足车载天线对多频段通信和高隔离度MIMO天线的技术要求,其结构和尺寸专为安装于汽车内部中控台背面而设计。

基于缺陷地和开口谐振环的三频段小型化天线

提出了一种新型三频段工作的小型微带贴片天线,天线采用不对称结构,在接地板上引入缺陷地结构(DGS)改变了天线表面电流分布,改善工作频率,衍生在无线局域网(WLAN)(2.4 GHz)处的频带。加载开口谐振环(SRR)金属环结构在独立控制WLAN(5.8 GHz)的频带的同时,减小了12%的天线体积。天线结构紧凑,整体尺寸为12.5 mm×28.5 mm×1.5 mm。结果表明,天线覆盖3个独立的阻抗带宽,分别为800 MHz(1.96~2.76 GHz),200 MHz(5.65~5.85 GHz)和1 460 MHz(7.64~9.1 GHz),在频段内的回波损耗均小于-10 dB,具有良好的方向性和增益,支持WLAN(5.8/2.4 GHz)频段和国际电信联盟(ITU)(8.0~8.7 GHz)频段的应用。

一种使用高次模式阻抗匹配的三频频率可重构天线设计

传统的频率可重构天线多采用电控可变元件构造馈电网络,导致设计和加工复杂。此外,电子元件的使用降低了辐射效率,使得性能不稳定。本文提出了一种采用高次模式进行阻抗匹配的机械调谐频率可重构天线。为使用固定的馈电网络进行阻抗匹配,并且不添加任何电控可变元件,该天线在两个低频频段工作于三次模以增加输入阻抗。这一设计增加了性能的稳定性,提高了辐射效率,减少了天线设计和加工的复杂度,降低了成本。天线在2.6 GHz、3.5 GHz和4.9 GHz三个5G应用波段取得了良好的谐振,辐射效率基本达到90%。

基于3D打印的柔性三频微带天线的设计与加工

为解决可穿戴设备在复杂应用场景中无线信号响应范围较窄的问题,该文提出了一种柔性三频微带天线,在2.5 GHz、3.5 GHz、5.4 GHz微波频段采用双“T”型+双“L”型表面结构实现天线的谐振,采用聚酰亚胺为基底材料,纳米银为辐射贴片及接地面的导电材料以实现柔性化。使用ANSYS HFSS对天线进行建模并进行仿真分析,使用微滴喷射3D打印工艺对其加工,有效地解决了传统微机电系统(MEMS)加工在柔性电子领域上成本高及步骤复杂等问题。最后使用场发射扫描电镜分析打印面形貌,并使用矢量网络分析仪分别测试天线成品的回波损耗、可弯折性及弯折抗疲劳性,测试结果与仿真结果基本一致,且天线具有较好的弯折性能。

一种宽带多网组合卫星导航终端天线

为了满足多系统兼容、高集成度卫星定位终端对天线的需求,提出了一种宽带多网组合卫星导航终端天线。天线采用宽带交叉偶极子结构实现全球卫星导航系统全频段(1164 MHz~1278 MHz&1557 MHz~1612 MHz)覆盖,采用平面倒F天线结构实现蓝牙/WLAN频段(2400 MHz~2483.5 MHz)覆盖,采用缺陷地单极子结构实现移动通信宽频(824 MHz~960 MHz&1710 MHz~2690 MHz)覆盖,通过微带枝节匹配和去耦结构等手段实现多组天线的融合,天线整体尺寸为120 mm×120 mm×45 mm。实测结果表明:天线电压驻波比优于目标带宽,方向图增益实测结果与仿真结果吻合。该天线具有频带宽、增益高、易调谐等优点,可较好地应用于全频段全网通测量型卫星定位终端设备中。

小型化多频基站天线的设计

文中设计了一种工作频段为698~960MHz的新型低频辐射单元,该辐射单元上方可嵌套4个工作频段为1700~2700MHz的高频辐射单元,实现一列低频两列高频的多频天线,底板宽度只有280mm,与常规三频天线的宽度380mm相比,宽度减小约26%,减小了天线尺寸,实现了天线的小型化设计。仿真结果表明,该方案在698~960MHz及1700~2700MHz的水平面方向上,能满足常规基站天线的需求。

基于哑铃型缺陷地结构的多频微带贴片天线设计

天线的多频带实现对提高无线通信的性能至关重要。通过加载哑铃型缺陷地结构(Dumbbell Defected Ground Structure,DB-DGS)和贴片刻蚀槽缝,设计了一款新型基于同轴馈电的三频段矩形微带贴片天线,可满足无线本地局域网(WLAN-2.45 GHz)、(WLAN-5.25 GHz)以及全球微波互联网(WiMAX-3.5GHz)的应用需要。天线的S11<-10 dB的回波损耗值分别为-20.8、-20.6、-24.0 dB,对应增益分别为2.8、2.2、3.1 dBi,实现了良好的阻抗匹配。引入哑铃型DGS的等效电路模型,对DGS和槽缝结构的主要参数进行仿真分析,可为天线开发设计人员拓宽思路。

北斗GPS双模导航终端天线的设计

阐述海上任意位置接收到卫星信号,接收天线需要覆盖更多的模式,并视情况切换至其他导航系统。探讨一款用于船载导航的多频段圆极化天线的设计,该终端天线能够覆盖北斗一代收发L/S频段,北斗二代B1及GPS L1四个频段,满足了北斗以及多系统联合的导航应用需求。

双频段MIMO印刷偶极子天线设计

该文设计一款双频段MIMO印刷偶极子天线系统,由2个天线单元组成,每个辐射单元由2个不同尺寸的微带开口环组成。通过在地板上开方形栅格,减少了2个天线单元之间的耦合,提高天线端口间的隔离度,在2个工作频段内隔离度均高于25 dB。

一种多频段双波束超宽带测向天线设计

设计了一种多频段双波束超宽带测向天线,通过采用切割抛物面多馈源形式,涵盖L/S/C/X频段,不仅节省设备平台的空间,又能实现多频段双波束共用抛物面,利用结构上改变抛物面切割形式来达到压窄方位面波束的目的。采用馈源偏置的抛物面天线,可以将馈源、馈线、支撑结构等从反射波很强的区域移开,减少对口径面的遮挡,从而改善匹配、降低副瓣电平,实现了多频段双波束共用反射面的设计。测试结果表明天线在L/S/C/X频段范围内电性能良好。

大型宽带相控阵天线子阵级延时器误差分析及补偿

子阵级使用延时器是改善宽带相控阵天线波束性能常用的技术途径。在对延时器电性能误差特性分析的基础上,提出采用次级子阵延时器联合TR通道移相器和衰减器分级补偿天线系统内部射频链路的时延、幅度和相位误差的方法。通过采用两级子阵延时架构的一维大型天线阵列模型的仿真验证,表明该方法不仅可实现大带宽大扫描角大型相控阵天线的方向图高精度控制,同时降低了大时延量延时器的研制难度。