Compact uniplanar antenna for WLAN applications

A compact dual-band uniplanar antenna for operation in the 2.4/5.2/5.8 GHz WLAN/HIPERLAN2 communication bands is presented. The dual-band antenna is obtained by modifying one of the lateral strips of a slot line, thereby producing two different current paths. The antenna occupies a very small area of 14.5times16.6 mm² including the ground plane on a substrate having dielectric constant 4.4 and thickness 1.6 mm at 2.2 GHz. The antenna resonates with two bands from 2.2 to 2.52 GHz and from 5 to 10 GHz with good matching, good radiation characteristics and moderate gain     

Dual-band HF-UHF RFID tag antenna

A dual-band HF and UHF RFID tag antenna with two feeding points is presented, fabricated and measured. A convenient HF resonance is obtained with an HF ASIC chip as well as good impedance matching with UHF ASIC chip in the European RFID UHF band. Tuning techniques of the design parameters are proposed, and tag performance in both frequency bands is evaluated.     

一种新型宽带双频段圆极化RFID读写天线

提出了一种新型宽带双频圆极化射频识别(RFID)读写天线,由上层的旋转对称折合振子和缝隙加载的方形贴片以及下层的紧凑型馈电网络构成。天线具有两个外部端口,分别激励低频0.9 GHz和高频2.45 GHz双频段的圆极化辐射。借助HFSS对天线进行了建模、仿真和优化,最后采用FR4板材制作天线实物并完成了试验测试。天线的外部尺寸为0.6λ0×0.6λ0×0.1λ0(λ0为0.9 GHz频点下的自由空间波长),测试结果表明,天线在低频段和高频段的-10 dB阻抗带宽和3dB轴比带宽分别为91.1%(4.9%)和87.8%(1.3%),频段内的峰值增益为5.48 dBic(3.63 dBic),最小轴比为1.1 dB(1.2 dB),在高低频段内,天线的辐射方向图对称稳定。该天线不仅能够满足全球通用型UHF频段(0.84~0.96 GHz)和ISM频段(2.4~2.5 GHz)RFID读写应用需求,而且具有低成本、易加工等优点,在物联网领域将具有很好的应用前景。     

A Dual-Band Circularly Polarized Hexagonal Ring Antenna for Handheld RFID Readers

In this paper, a compact, lightweight, low-profile dual-band circularly polarized antenna is presented for handheld radio frequency identification (RFID) readers. The proposed antenna consists of two concentric hexagonal rings and a feed network printed on different layers of the dielectric substrate. The antenna configuration exploits a stacked-coupled technique for gain enhancement and single-port feeding for easy manufacturing. The center frequencies of the two resonating bands are 0.92 GHz (UHF) and 2.45 GHz (ISM). The antenna exhibits circular polarization characteristics in both the resonating bands, therefore encountering the losses due to polarization mismatch and increasing the tag detection reliability. A prototype of the proposed RFID antenna is simulated and fabricated, and experimental results are in close agreement. The peak antenna gain is 3.3 dB and 5 dB in the UHF and ISM bands, respectively. The overall size of the RFID antenna is 80 mm?×?80 mm?×?7.76 mm.

     

适用于IT设备资产管理的RFID标签天线设计

针对用于IT设备资产管理的RFID系统存在读取率低、读取范围小、易受干扰的问题,设计了一种具有抗金属、抗移动通信终端干扰、高增益的双频微带天线。HFSS仿真结果显示,标签天线在CDMA800和GSM的UHF频段 S11值大于-10 dB,天线最大增益为7.28 dBi,标签最大读取距离理论估值为17.66 m。设计的RFID标签天线适应IT设备资产管理环境特殊要求。     

一种基于零阶谐振的双频电小天线设计

提出利用复合左右手传输线结构的零阶谐振设计一款具有双频特性的电小天线.该电小天线主要由介质基板、地面、加载了交指电容的贴片、弯曲线电感与圆角矩形虚拟地组成,具有电小尺寸特性(电尺寸为0.75).该天线有两个工作频段,频段1的中心频率为1.22 GHz,频段2的中心频率为2.78 GHz,对应的相对带宽分别为3.28％和...     

Dual-band CPW-fed folded-slot monopole antenna for RFID application

A folded slot with open end is introduced to achieve a dual-band coplanar waveguide (CPW)-fed monopole antenna for radio frequency identification (RFID) applications. The designed antenna, which, including the substrate, is only 32 mm in height and 20 mm in width, can operate simultaneously at the 2.45 and 5.8 GHz bands with -1.8 and 2.3 dBi gains, respectively. Its properties make the antenna suitable for RFID tags     

Broadband dual-frequency meandered CPW-fed monopole antenna

A coplanar waveguide meandered feedline is introduced to obtain a broadband dual-frequency operation of a planar monopole antenna. The modified feeding technology can lead to good impedance matching in a wide dual-band covering 2.4/5.2 GHz WLAN operations. A prototype of the proposed antenna has been constructed and tested. Good radiation characteristics of monopole-like patterns, 23.3 and 29.5% bandwidths, and 2.41 and 4.21 dBi peak antenna gains for the lower and upper bands, respectively, have been obtained.     

一种UHF频段宽带电子标签天线的设计分析

针对射频识别系统UHF频段的欧洲标准866~869 MHz和美国标准902~928 MHz,以及中国标准840~845 MHz和920~925 MHz,设计并制作了一种电磁耦合馈电结构的标签天线,其结构简单且便于调整匹配阻抗,带宽较宽且具有双频谐振特性,能同时适用于以上几种RFID标准。通过仿真和实测分析关键物理参数对天线特性的影响,结果表明该天线性能较佳且实用。     

Dual-band toroidal beam antenna for WLAN communications

A novel dual-band toroidal beam antenna for wireless local area network (WLAN) communications is presented. The antenna mainly consists of six dual-band inverted-L radiating elements and a twosection six-way microstrip power divider. By inserting slots into the radiating elements, two resonant frequencies are achieved at WLAN bands. By using the two-section six-way power divider, the six radiating elements are excited with equal amplitude and phase at the two working frequency bands. A prototype has been constructed and tested. Good toroidal beam radiation patterns for 2.4 and 5.2 GHz bands are obtained.     

Printed double-T monopole antenna for 2.4/5.2 GHz dual-band WLAN operations

A novel and simple printed dual-band double-T monopole antenna is proposed. The antenna comprises two stacked T-shaped monopoles of different sizes, which generate two separate resonant modes for the desired dual-band operation. The proposed antenna has a low profile and can easily be fed by using a 50 /spl Omega/ microstrip line. Prototypes of the proposed antenna designed for WLAN operations in the 2.4 and 5.2 GHz bands have been constructed and tested. Good radiation characteristics of the proposed antenna have been obtained. Effects of varying the monopole dimensions and the ground-plane size on the antenna performance have also been studied.     

A Low-Profile Dual-Band Surface Wave Antenna With a Monopole-Like Pattern

A dual-band surface wave antenna (DBSWA) that realizes a monopole-like radiation pattern with a low-profile configuration is designed and measured. The antenna consists of two parts: a center-fed modified crosspatch to excite surface waves at two frequency bands, and a thin dielectric slab loaded with periodic patches to support the propagation of the surface waves. The surface wave property and radiation mechanism of the DBSWA are described, and parametric studies are performed to understand the dual-band characteristics of the antenna. The proposed antenna with only 3 mm thickness (< 0.05 lambda) is fabricated and tested, which resonates at 4.2 and 4.9 GHz. The corresponding impedance bandwidths and gains are 1.10% and 4.9 dBi for the low frequency band and 3.94% and 5.4 dBi for the high frequency band.     

一种新型双频宽波束四臂螺旋天线的设计

根据移动卫星通信和卫星导航定位中对天线宽波束、圆极化和低仰角增益等要求,设计了一种新型的双频四臂螺旋天线,通过将工作于不同频段的两副结构类似的天线以内外共轴的方式形成一个整体来实现双频工作。天线通过开槽线巴伦实现平衡馈电,利用四臂螺旋自身的结构特点构造了90°自相移结构,获得了较好的宽波束圆极化特性。测试结果表明。实测和仿真结果基本一致,天线在两个频段都实现了较好的宽波束圆极化特性。     

Dual-Band Circularly Polarized Dual-Slot Antenna With a Dielectric Cover

A new circularly-polarized (CP) dual-slot antenna fed by a single L-probe is proposed for dual-band applications. The antenna consists of a zonal slot and an annular slot, both of them being cut onto a square conducting cavity with a protective dielectric cover. It is observed that the resonance frequencies of the lower and upper bands are controlled by the zonal and annular slots, respectively, making designs of the dual-band antenna very easy. To demonstrate the idea, the proposed antenna was designed at 2.4/5.8 GHz for two IMS bands. The reflection coefficient, axial ratio, radiation pattern and gain of the dual-band antenna were studied, and reasonable agreement between the simulated and measured results was obtained. A parametric study was carried out to characterize the proposed antenna.      

太赫兹双频缝隙贴片天线的设计

提出了一种工作在太赫兹频段的双频缝隙贴片天线。在天线辐射贴片上加载“C”、“E”型辐射缝隙,改变天线表面电流的路径来实现双频特性。通过HFSS 15.0仿真软件对天线模型进行仿真,天线可以同时在300 GHz(291～306 GHz)和640 GHz(632～656 GHz)的频段下工作,最大增益达到了7.38 dB和10.50 dB。该双频天线结构简单,各项性能指标稳定,对于工作在太赫兹频段上的通信系统和无线传输系统具有一定的应用价值。     

一款低不圆度WLAN 双频天线的设计与实现

提出了一种改进型的应用于无线局域网的双频印刷单极子天线。该天线可以覆盖IEEE 802. 11a/ b/ g (2. 4 ~2. 484GHz,5. 15 ~5. 825GHz)频段标准,其回波损耗小于10dB 的阻抗带宽在2. 4GHz 频段可达290MHz(2. 28 ~2. 57GHz),在5GHz 频段可达5. 53GHz(4. 34 ~9. 87GHz)。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。该天线的总体尺寸为22mm×44mm,结构紧凑, 且具有不圆度低、成本低和易于集成等优点, 因此具有 十分良好的应用潜质。     

Compact printed dual-band dipole with wideband integrated balun

A novel compact printed dual-band dipole with an integrated wideband balun is presented. The proposed antenna consists of two radiating microstrip branches and a slot balun etched in the ground plane. With the integrated balun, the proposed antenna yields an impedance bandwidth of 2.38?2.65 and 4.95?6.35 GHz with return loss less than 210 dB, while retaining a compact size of 30 X 25 X 0.8 mm³. The antenna has general good omnidirectional radiation patterns in its H-plane and attains considerable gain characteristics across its dual bands. Measured and simulated results are demonstrated to verify the proposed design.     

一种高隔离度的双倒L形双频MIMO天线设计

研究了一种微带线馈电的双倒L形双频MIMO印刷天线结构,通过在倒L单极子结构上加载一条倒L形地板枝节,实现了天线的双频特性;通过在天线单元之间加载一条T形去耦枝节,有效提高了天线单元之间的隔离度。实验结果表明,天线在S11≤-10 dB时,工作频段分别为2.39~2.53 GHz和4.92~6.15 GHz,相对带宽分别为5.7%和22.2%,工作频段内隔离度均大于18 dB。此外,天线整体辐射特性较好,结构简单并易于制作,可应用于WLAN无线通信系统。     

A Dual-Band Dipole Antenna With Integrated-Balun

The design and realization of a dual-band balun-integrated dipole antenna is presented. A new type of dual-band balun is introduced as the feeding network, providing antiphase input signals for the dual-band dipole antenna. The dual-band balun is realized by the aid of a stepped-impedance transformer and tapped open-ended stubs. Combined with this balun, a uni-planar dual-band dipole antenna is designed. An experimental prototype working at 2.45/5.25 GHz are fabricated and measured. The measured performances of the antenna show good return loss and radiation patterns at the two working frequencies, proving the dual-band operation of the proposed dipole antenna.     

Tunable dual-band planar antenna

A dual-band antenna design that covers the 2.26-2.54 GHz and 5.14-6.10 GHz bands is presented. The proposed antenna design consists of two patch radiators suspended above a ground plane. The performance in the lower and upper bands can be controlled with less mutual coupling effect. The antenna also features less beam squinting of the radiation patterns at boresight for both operating bands.