家用小功率电器的微波无线供电研究

智能家居热度不减,而家用电器的无线供电也是人们研究的热点.微波无线能量传输具有定向性好、传输距离远的特点,在无线输电领域具有广泛的研究前景.通过仿真计算确定印制偶极子天线的基本参数,完成了偶极子天线的设计和制作.以印制偶极子天线为微波的接收天线,结合椭圆滤波器和整流二极管等制作的整流电路,完成了2.45 GHz频率下的微波输电实验.实验获得了72.7％的RF-DC整流效率及197 mW的直流能量,为家用电器的无线供电提供了一种可供探索的方式.     

应用于无线人体局域网的小型超宽带天线

文章设计了一种应用于无线人体局域网的超宽带单极天线,使用高频结构仿真软件HFSS13.0对天线尺寸进行仿真和优化,对天线的阻抗特性、方向图进行了研究.仿真和测试结果表明,该天线在3.1GHz～ 3.3GHz、4.2GHz ～ 4.9GHz和6GHz ～ 10.6GHz的工作频段内电压驻波比均小于2,且具有稳定的方向图,十分适用于无线人体局域网.     

一种应用于WLAN的新型多频印制天线

基于微带天线设计思路和方法,设计了一种新型小型化应用于2.4 GHz/5.2 GHz/5.8 GHz多频段无限局域网(WLAN)的微带印制天线并进行了软件仿真,该天线在要求阻抗带宽内有很好的辐射特性,仿真结果验证了文中研究工作的合理性和可行性.     

一种适用于2.4GHz无线语音的IFA天线设计

设计了一种用于2.4GHz无线语音的IFA( Inverted -F Antenna)天线,该天线能够满足2.4GHz频段无线语音传输对天线尺寸、价格和性能的要求.使用有限元法进行数值仿真和设计,该天线可达到较好的效果.该天线的仿真和实测结果表明,在2.46 GHz的中心工作频率下,回波损耗为19.9 dB,带宽约为5...     

一种适用于无线网络的倒F天线设计

设计了一种用于无线传感器网络的结构紧凑的倒F天线，该天线能够满足无线传感器网络尺寸小、价格低廉、功耗低的要求。通过有限元法进行数值仿真和设计，该天线可达到较好的效果。设计制作的天线经测试，在2．45GHz的中心工作频率下，回波损耗为。25dB，带宽为120MHz，满足了IEEES02．15．4协议的要求。     

基于玻璃纤维环氧树脂的双陷波宽频微带天线设计

设计了一种新型的宽频微带天线,天线基本结构为回字形,在两个正方环主辐射贴片之间通过四个长方形辐射贴片进行连接.天线基板材质选用玻璃纤维环氧树脂复合材料,大小为30 mm×45 mm,厚度为1.6 mm.天线结构采用电路板印制工艺进行图形化,参考地印制于基板背部.借助Ansoft HFSS 13.0进行仿真,在1～8 GHz范围内进行扫频,结果显示其可用频段为2.1～4.3GHz,相对带宽为68％.给出了天线反射系数、电压驻波比、输入阻抗和增益方向图的仿真结果,分析了结构参数对天线辐射性能的影响,实际测量与仿真结果基本一致.     

一种小型化双频微带缝隙天线的设计

设计了一款贴片上开槽加载和微带线馈电的新型结构缝隙天线,可工作在无线局域网络的2.4GHz/5.2GHz双频段上。经过高频仿真软件HFSS对天线的仿真,结果比较理想,实测结果也表明该款天线完全符合无线局域网络所需的频带要求。     

一种用于WSN的微小型UWB雷达天线设计

超宽带雷达不受雨、雪、声、风等自然环境的干扰,可用于无线传感器网络并全天候工作;在通信领域,超宽带雷达可避免多径干扰问题,解决无线传感器网络在复杂多径环境中的应用局限问题。故超宽带雷达可以与无线传感器网络形成天然的结合。为满足无线传感器网络低功耗、体积小的要求,设计了一种微小型超宽带雷达天线。该天线为共面波导方式馈电的贴片式微带天线。仿真结果表明,天线具有体积小、带宽广(1.78~2.38 GHz)、全向性好的优点,满足无线传感器网络应用需求,并可避免与已用无线通信频段的干扰,具有广阔的应用前景。     

一种新型双频天线的设计

提出了一种新型紧凑单馈的双频段天线,天线采用单层微带馈线和开口矩形框的接地板结构,分别印制在介质板的两侧。天线的面积只有13 mm×22 mm。天线的工作中心频率分别为2.45 GHz和5.25 GHz,同时,运用HFSS10电磁仿真软件对影响工作中心频率的参数进行了分析。最后制作出实物,并且对其进行测试,测试结果与仿真结果基本吻合。所提出的天线具有小型化和双频段的特性,在无线局域网通信中有很好的应用前景。     

超宽带印制矩形单极天线设计

针对超宽带通信应用,研究影响印制单极天线阻抗带宽的主要因素,设计基于微带馈电的小型化印制矩形单极天线。按照等效性原理,采用黄金分割比设计矩形振子体;通过接地面上端引入渐变梯形或凹形结构,同时调整馈入端接地面间隙,可实现印制矩形单极天线的超宽带特性。对具有渐变梯形或凹形接地面结构的微带馈电矩形印制单极天线结构进行优化,仿真结果表明,前者的阻抗带宽为2.96～17.94GHz,后者的阻抗带宽为2.9～13.3GHz,而两者的辐射方向基本保持不变。实测结果与仿真结果基本一致,达到了超宽带通信应用的要求。     

一种用于无线局域网的双频带印刷偶极子天线

介绍了一种运用于无线局域网的小型化印刷偶极子天线,它采用对偶极子两个臂开槽结构,使其获得双频带和小型化的特性。采用基于耦合馈电的巴伦馈电方式,使天线具有宽带匹配、结构简单、制作方便、易于集成到无线通信设备中的优点。仿真结果表明,在2.4 GHz和5.8 GHz两个频带的带宽分别为590 MHz(2.13~2.72 GHz约24.33%)和700 MHz(5.24~5.94 GHz约12.52%),而且方向图比较理想。该天线的主要优点是结构简单、体积小、低剖面、成本低、易共形,能够满足WLAN的需要。     

Microstrip-fed dual-U-shaped printed monopole antenna for dual-band wireless communication applications

A microstrip-fed dual-U-shaped printed monopole antenna design for wireless communication applications in the 2.4 and 5.8 GHz bands is presented. This antenna combines omnidirectional, high gain and broad bandwidth in an easy to fabricate structure. Experimental results of the constructed prototype are presented.     

一种改进型折叠条带带陷UWB印刷单极子天线

为满足短距离无线通信系统的要求,设计并实现了一种改进型的超宽带印刷单极子天线,通过在U型辐射臂上对称加载了两个折叠条带,使天线具备了带陷功能,利用HFSS软件详细分析了折叠条带和缝隙的尺寸变化对天线陷波特性的影响。实际制作了天线的实物,测试结果和仿真结果基本吻合。该天线的阻抗带宽可以覆盖3.04~10.95 GHz,阻带范围约为4.95~5.97 GHz,绝对带宽为7.88 GHz,完全具备超宽带性能。在整个工作频段内近似具有全向性,增益曲线平坦,天线的尺寸仅为31 mm×35 mm,结构紧凑,加工方便且容易集成。     

Printed modified loop antenna for WLAN/WiMAX applications

A printed modified loop antenna design for wireless communication applications in WLAN and WiMAX operation in the 2.4 GHz bands is presented. This antenna combines omnidirectional, high gain and broad bandwidth performance in an easy to fabricate structure. The experimental results of the constructed prototype are presented     

A novel Ultra WideBand monopole antenna with band-notched characteristics

A simple and compact microstrip-fed Ultra WideBand(UWB) printed monopole antenna with band-notched characteristic is proposed in this paper.The antenna is composed of a square ring with a small strip bar,so that the antenna occupies about 7.69 GHz bandwidth covering 3.11～10.8 GHz with expected band rejection from 5.12 GHz to 5.87 GHz.A quasi-omnidirectional and quasi-sym-metrical radiation pattern is also obtained.This kind of band-notched UWB antenna requires no ex-ternal filters and thus greatly simplifie...     

Dual-band monopole antenna with shorted parasitic element

A printed dual-band C-shaped monopole antenna with a shorted parasitic element is proposed. The proposed antenna can provide two separate impedance bandwidths of 156 MHz (about 6.4% centred at 2.45 GHz) and 2048 MHz (about 37% centred at 5.5 GHz), making it easily cover the required bandwidths for wireless local area network (WLAN) operation in the 2.4 GHz band (about 3.4% bandwidth required) and 5.2/5.8 GHz bands (about 13% bandwidth required). Furthermore, the proposed antenna shows a low-profile of 635 mm above the ground plane. Details of the proposed antenna design and experimental results are presented and discussed.     

A Compact Plus Shaped Carpet Fractal Antenna with an I-Shaped DGS for C-band/X-band/UWB/WIBAN applications

This article presents the design and development of a compact broadband “+” shaped aperture coupled carpet fractal antenna with a defected ground structure (I shaped slot in the ground) for broadband/ultra wideband (UWB) and a multiband characteristics. The antenna has overall dimensions of 8.4 cm?×?5.5 cm?×?3.2 mm and is fed using aperture coupled feeding mechanism. It shows an impedance bandwidth (<?10 dB) of 4460 MHz from 6.93 to 11.39 GHz with fractional bandwidth of 0.48 at the center resonant frequency of 9.16 GHz. A multiband behavior is also exhibited by this antenna from 3.9–4.08 GHz, 4.8–5.06 GHz and 6.1–6.4 GHz with impedance bandwidths of 180 MHz, 260 MHz and 300 MHz respectively. It therefore supports the wireless applications of Wi-MAX (3.8–4.1 GHz), Wi-BAN/long distance radio telecommunication (4.8–5.06 GHz), wireless sensor networks (6.1–6.4 GHz), satellite (7.4–7.8 GHz) and UWB (6.9–11.03 GHz). The antenna is designed as a ‘+’ shaped patch with fractal rectangular slots cut out from it up to iterations of second order that allow the antenna to support multiband characteristics. The bandwidth at these bands is improved by using I shaped defected ground structure (DGS) and a parasitic feeding method i.e. aperture coupled feeding (Karur et al., in: ICMARS (IEEE), Jodhpur, India, pp. 266–270, 2014).The antenna has a compact structure with two layers of FR4 substrate, the ‘+’ shaped carpet fractal printed on the upper substrate layer and the lower substrate has a ground layer printed on its top and feed line on its bottom layer respectively. It shows a simulated peak gain of 4 dB at an operation frequency of 7.95 GHz. The antenna design and simulations are done using CST MWS V14. The Simulation results in terms of impedance bandwidth, smith chart, gain are presented in this article. To validate the impedance bandwidth results, the proposed carpet fractal antenna is experimentally tested using a vector network analyzer and the measured results are found to be closely matching with the simulated ones, allowing the antenna to be practically suitable for the afore mentioned wireless applications.

     

可用于物联网的高隔离度双频MIMO天线

设计了一种高隔离度双频多输入多输出（MIMO）天线,该天线覆盖2.4 GHz和5 GHz无线局域网频带,可以应用于移动物联网之中。天线包含两个相同的辐射单元天线,采用微带馈电的方式进行馈电。单元天线使用单极子天线作为基本辐射器,其包含一根长的和短的单极子天线,分别谐振在低频和高频频段。通过在两个单元天线中间加载T型隔离器提高了单元天线之间的隔离度。天线的辐射振子、馈电以及T型隔离器都印刷在同一块微波板材上,从而方便了天线的制作和加工。仿真结果表明,该天线在1.9~2.8 GHz以及4.7~6.2 GHz频带范围内能实现良好的双频工作特性,天线隔离度近20 dB,可以广泛应用于物联网系统中。     

一种基于缝隙结构的小型双频段射频能量接收天线

随着超低功耗芯片技术的发展,无线传感器节点的功耗已进入微瓦（μW）级范围,使低功耗传感器利用周围环境中的射频无线能量为自身供电成为可能。提出了一种用于无线传感器节点的小型射频能量接收天线。该天线采用微带缝隙结构,基于缝隙天线设计理论,应用全波电磁场工具对其进行了设计及仿真优化,并获得了该结构谐振点随尺寸变化的一般规律。在常用FR4材料的小尺寸双面PCB板上,通过开槽加载和微带线馈电方法使天线可以同时工作在GSM和ISM两个频段。在1．9GHz和2．4CHz频率点上,天线的回波损耗分别为-39．4dB和-20．8dB,最大增益分别达到1．4dBi和2．9dBi,测试与仿真结果基本吻合。该天线含地平面在内的尺寸为5cm×5cm,实现成本低,可同时接收两个频段的射频能量,有效地扩展了频率适应范围,提高了能量接收效率。     

Radiation Characteristics and Mutual Coupling of a Dual: Band Antenna Array Structure

In this paper, an antenna array structure consisting of a reflector plate and a number of printed dipole radiation elements is investigated. This antenna array implementation is suitable for the globally available 2.4 and 5?GHz ISM frequency band facilitating a variety of wireless applications. S-parameters and radiation characteristics are simulated and measured in details. The impact of the plane reflector on radiation patterns and the reflection coefficient are also investigated. Furthermore, mutual coupling effects between adjacent elements and the corresponding radiation patterns are studied for different antenna array configurations. Both simulated and measurement results are useful in antenna array design and antenna applications in wireless communications.