新型WLAN平面倒F双频天线的设计

提出了一种新型的应用于2.4/5GHz蓝牙和无线局域网的双频内置平面倒F天线。该天线结构紧凑,可以方便地植入无线通信设备中,有较强的实用性。通过加载F形槽和阶梯形槽使天线能够满足无线局域网中小型化双频天线的技术要求。天线在蓝牙频段阻抗带宽达到300MHz(2.21~2.51GHz),在无线局域网频段阻抗带宽达到1070MHz(4.95~6.02GHz),辐射方向图表明该天线全向性能较好,增益在3.1~6.7dBi范围内。     

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。     

一种应用于WLAN 的双频对称型单极子天线

设计了一种应用于无线局域网的由共面波导馈电的双频单极子天线。该天线在2.45 和5.5 GHz 频率下谐振,其(10 dB)阻抗带宽分别为2.40～2.52 GHz 和4.80～7.30 GHz,覆盖了无线局域网2.4/5.2/5.8 GHz 的工作频带。另外,在工作频带内,还获得了良好的全向辐射方向图和天线增益。     

新型双频全向Alford环微带天线

基于无线通信系统对极化分集的应用需求,提出一种新型双频水平极化全向Alford环天线。该天线由2个环形辐射结构构成,外环辐射结构包含4个微带偶极子阵列,谐振频率为2.45 GHz;同时新增耦合圆环内辐射结构,谐振频率为5.225 GHz。实测结果表明,该天线在802.11b (2.40～2.48 GHz)和802.11a (5.15～5.35 GHz)频率范围内S11优于-10 dB,其中在2.45 GHz和5.225 GHz的S11分别达到-17.9 dB和-27.2 dB。由于具备良好的水平极化全向辐射特性,该天线可作为极化分集天线单元应用于无线局域网(WLAN)多输入多输出(MIMO)系统中。     

一种用于WLAN的双频反C形CPW馈电天线

提出了一种新颖的由共面波导(CPW)馈电的单极子双频天线。天线可分别在2.5 GHz和5.5 GHz频率上谐振。该天线由一个反C型单极子组成,如同一个缺了一角的环形单极子,结构简单。利用HFSS仿真得到的-10 dB阻抗带宽分别为低频部分10.4%(2.35~2.61 GHz),高频部分27.8%(4.96~6.46 GHz),能够满足无线局域网(WLAN)的需要。同时天线的体积较小可以降低成本。     

用于无线局域网的双频微带接收天线

文中设计一种在贴片上加载开C形缝隙的新型双频微带天线,该天线具有结构简单,体积小,重量轻,制造简单,成本低的优点,适合集成.可以应用在无线局域网802.11b(2.4-2.48GHz)和802.11a(5.150-5.350GHz)的系统中.并且经过实验测得,可以通过改变馈源的位置,实现对天线的高频和低频段的调节,实验测试和仿真结果有很好的效果,适用于无线局域网系统中.     

基于PIN管的波束可重构双频反射阵列天线

利用PIN管实现反射阵列天线单元补偿相位的改变,使得反射阵列天线完成快速的双频宽角度电子波束扫描。天线结构为12×12反射天线阵列,通过在天线单元上添加PIN管,并编程控制PIN管的导通截止,可进行反射阵列天线双频宽角度电子波束扫描。仿真和实验表明,反射阵列天线在3.82 GHz和4.52 GHz均可实现±45°波束扫描,实测3.82 GHz增益为10 dB左右,4.52 GHz增益为13 dB左右。     

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。     

应用于WLAN的小型化双频微带天线设计

设计一种中心频率分别为2.43GHz和5.24GHz的小型化双频微带天线,在反射系数S11-10dB条件下,带宽分别为63MHz和105MHz,基本覆盖了2.4GHz的ISM波段(2.4GHz-2.4835GHz)和5.25GHz的ISM波段(5.15GHz-5.35GHz)。通过在矩形辐射贴片开槽来实现天线的小型化和双频工作,并分析了槽对天线S11的影响。辐射贴片尺寸为16mm×25mm,天线整体性能良好,适合应用于无线局域网(WLAN)通信终端。     

一种新颖的应用于无线局域网的小型化单极子天线

给出了一个新颖的三频工作的单极子天线,并可以应用于无线局域网。这个天线由对称结构和地板组成,它们分别印刷在介电常数为4.4、厚度为1.6 mm 的FR4 介质板的两面,并且采用微带线的馈电方式。这个天线有着小型化尺寸26 mm×20 mm×1.6 mm。测量结果显示,低频和高频的-10 dB 阻抗带宽分别为2.3-2.5 GHz 和4.7-6.8 GHz;这个 带宽覆盖了2.4/5.2/5.8 GHz 无线局域网工作频段。同时得到了较好的全向方向图。这个天线的低频和高频的平均增益分别为2dBi 和3.7dBi。     

Compact triple band antenna for WLAN/ WiMAX applications

A low profile printed antenna with triple band operation is presented for simultaneous use in wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The antenna consists of a rectangular radiating element fed asymmetrically by a 50 Omega microstrip line and a shaped trapezoidal ground plane. Rectangular horizontal strips are attached to the radiation element to form different current paths which make the antenna resonate in WLAN and WiMAX frequency bands. The antenna operates in dipole configuration outlining overall dimensions of 38 times 30 times 0.8 mm³.     

Printed folded dipole array antenna with directional radiation for 2.4/5 GHz WLAN operation

A printed linear array antenna comprising three half-wave folded dipole elements with the first two elements operating in the 5 GHz band and the third one operating in the 2.4 GHz band for WLAN operation is presented. The array antenna provides directional radiation patterns with vertical polarisation for frequencies across both the 2.4 and 5 GHz WLAN bands, and the measured antenna gain is 3.5-3.7 dBi for the 2.4 GHz band and 4.5-5.0 dBi for the 5 GHz band.     

Feed for dual-band printed dipole antenna

A dual-band printed dipole antenna is proposed for WLAN applications in the 2.4 and 5.2 GHz bands. A spur line was etched on the arms of the printed dipole to achieve the dual-band operation. The printed dipole antenna with a simplified matching network is proposed. The novel simplified feed structure consists of a pair of parallel metal strips printed on the opposite sides of the dielectric substrate and connected to a 50 /spl Omega/ microstrip line with a truncated ground plane. This feeding network does not require additional transition devices, such as a T-junction, power divider, tuning stub or microstrip-to-coplanar stripline balun.     

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.     

Design and performance analysis of side by side,echelon and H‐shaped multiple printed dipole antennas for wireless local area network application

An array of printed dipole antennas for wireless local area network applications is designed and simulated using ads software. In MIMO system, numbers of antenna elements are used in different configuration. This paper presents the simulated results of printed dipole antennas in side by side 4‐element array, echelon and H‐shaped dipole array configurations. The designed antenna is characterized by measuring return loss, radiation pattern, directivity, and gain and also presented the simulated capacity results of different array configurations. The mutual coupling between the dipoles of different orientations is included to make simulation more realistic. Copyright © 2013 John Wiley & Sons, Ltd.     

Printed dual-band dipole antenna with U-slotted arms for 2.4/5.2 GHz WLAN operation

Dual-band operation of a printed dipole antenna with U-slotted arms is presented. Due to the embedded U-shaped slots, two additional dipole arms are obtained in the proposed design, which form a second dipole antenna with a smaller length and which can generate a higher resonant mode for the 5.2 GHz band operation. By incorporating the original dipole arms designed for the 2.4 GHz band operation, the proposed antenna can perform WLAN operations in the 2.4 and 5.2 GHz bands.     

Multi-band monopole antenna with inverted U-shaped parasitic plane

A microstrip-fed printed monopole antenna having a parasitic plane is proposed for multi-band applications. By inserting an inverted U-shaped parasitic plane on the bottom of the dielectric substrate, the proposed antenna can easily cover DCS/UMTS/WiBro/2.4 GHz WLAN and 5.2/5.8 GHz WLAN bands at the same time. In addition, a /spl Gamma/-shaped slit is inserted on the main patch to cover the GSM frequency band. Experimental and numerical results of the designed monopole antenna are presented and analysed.     

一种新型宽带印制天线

本文给出了一种新型双偶极子型宽带印制天线,并设计出相应的类平行宽边耦合双线双面馈电结构。采用矩量法求解积分方程进行理论分析,由此设计出一种新型宽带印制天线,并进行实验测试。理论分析表明：在相同的基片上,双偶极子型印制天线比普通微带振子天线的带宽宽得多;同时实测结果表明：在0.8mm的介质基片上,工作于中心频率2GHz的该新型天线带宽可达23％（VSWR＜2.0）,增益达4.3dBi。该宽带天线为平面印制结构,易于与电路集成,亦可做为天线阵元,成本低,性能好。     

新型可重构临近耦合偶极子天线阵

提出了一种可重构的临近耦合印刷偶极子天线阵。其通过控制每个振子的间距和振子偏移中心馈线的距离实现方向图的改变,提出的可重构天线阵,将形成不同方向图的偶极子天线阵嵌套排布,并通过pin管开关切换不同的偶极子辐射单元组,从而实现天线方向图的重构,改变天线的最大辐射方向。仿真结果表明在9.8 GHz的中心频点上,该天线可实现最大辐射方向在0°和40°上切换:波束指向为0°方向时,最大增益为12 dBi;为40°时,最大增益为8.7 dBi,两种工作状态下天线输入端s11均优于-30 dB,匹配良好。