缝隙加载双频RFID读写器天线设计

设计了一款应用于RFID系统的双频读写器天线,该天线由一层双边开槽贴片,厚空气层及接地层的加载缝隙耦合实现双频工作.仿真天线的性能指标为:在驻波比小于2.0时,低频段(900 MHz)的工作带宽约为70 MHz(870～940 MHz),天线增益为6.57 dBi,高频段(2.4 GHz)的工作带宽约为300 MHz(2.235～2.535 GHz),天线增益为4.74 dBi;所设计的天线尺寸为179.3 mm×120 mm.     

用于WLAN的双频天线的设计与实现

提出了一种应用于无线局域网（WLAN）的新型双频天线。该天线采用微带线馈电的方法,其辐射面呈阶梯形,接地面为＂工＂型宽缝结构,可以覆盖IEEE802.11a/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160MHz（2.4～2.56GHz）,在5GHz频段的可达1.32GHz（5.05～6.37GHz）。整个天线在42mm×52mm、介电常数为4.5、厚度为1.5mm的FR4介质基片上实现。结果表明,该天线具有十分良好的应用潜质。     

一种新型的双频带可植入天线设计

设计了一款工作在医疗设备通信服务频段(MICS,402~405 MHz)和工业、科学和医疗频段(ISM,2.4~2.48GHz)的新型小型化双带植入天线。通过合并一个螺旋辐射带和一个U型辐射带,天线能形成紧凑的双平面倒F(PIFA)结构。包括上下基片层的天线总体积为17 mm×16 mm×1.27 mm。测量的低频带和高频带的–10 d B带宽分别为412~436 MHz和2.4~2.5 GHz。此外,研究了天线的辐射特性及比吸收率(SAR)。     

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.     

人工神经网络基双频RFID读写器天线设计

给出了结合人工神经网络进行双频RFID读写器天线的优化设计方法,该天线由一层双边开槽贴片,厚空气层及接地层的加载缝隙耦合实现双频工作.以天线电磁仿真结果作为人工神经网络模型的训练数据,以天线贴片的四个关键结构尺寸作为神经网络模型的输入参数,以天线回波损耗作为输出参数,实现天线的快速优化设计.所设计天线的性能指标为:在驻波比小于2.0时,低频段(900 MHz)的工作带宽约为70 MHz(870～940 MHz),高频段(2.4 GHz)的工作带宽约为300MHz(2.235～2.535 GHz);天线尺寸为179.3 mm×120 mm.神经网络模型和电磁仿真结果吻合良好.     

应用于手机中的小型化WLAN双频天线设计

设计了一款适用于手机的小型化WLAN天线,尺寸为10 mm×35 mm,天线的主要结构为一个折叠型倒L-L结构.设计过程中采用了共面波导馈电（CPW）技术,有效地增加了天线的带宽.仿真结果表明,天线在2.45 GHz时覆盖了2.38 GHz ～ 2.688 GHz,5.2 GHz时覆盖了4.77 GHz～6 GHz,同时达到了IEEE 802.1 1a和IEEE 802.11 b/g标准.整体来说,天线尺寸小、频带宽,方向图性能良好.对天线进行了实物加工并进行了测试,结果显示仿真与实验结果吻合,均能覆盖所需频段.     

一种新颖的宽频带无线局域网天线设计

本文提出一种结构简单的、宽带双频、共面波导馈电的单极子天线,本天线采用50欧姆的SMA接头对其进行馈电,印刷集成在一个22×35mm2的介质基板上,覆盖了无线局域网(WLAN)的2.4-,5.2-,5.8-GHz三个频带,并且具有良好的阻抗匹配特性。此天线的低谐振模式在VSWR<2时的阻抗带宽为320MHz(2.38到2.70GHz),满足了2.4-GHz WLAN工作频段(2.400-2.484GHz);此外,天线的高谐振模式在VSWR<2时的阻抗带宽为2.480GHz(3.580到6.060GHz),包含了5.2-GHz的HIPERLAN频段(5.150到5.350GHz)和5.8-GHz的WLAN频段(5.725到5.852GHz)。     

一种用于笔记本电脑的双频段八天线系统

提出了一种应用于笔记本电脑的双频段八天线系统.该八天线系统由一个四天线系统、两个双天线系统和两个T形谐振带构成.在分析了四天线系统和两个双天线系统的耦合机理后,提出了减小耦合的方法.实测结果表明:天线样品在2.4-GHz无线局域网(Wireless Local Area Network,WLAN)频段的-10 dB公共阻抗带宽为90 MHz(2.4～2.49 GHz),在5.2/5.8-GHz WLAN频段的-10 dB公共带宽为0.9 GHz(5.15～6.05 GHz),其中在5.15～5.19 GHz频段内的反射系数为-9.5～-10dB;八个天线单元在2.4/5.2/5.8-GHz WLAN频段内的互耦均低于-15 dB;在2.4-GHz和5.2/5.8-GHz WLAN频段内的增益分别高于2.7 dBi和3.3 dBi、效率分别高于53％和65％.根据实测三维辐射方向图计算了八天线系统的包络相关系数.     

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。     

新型WLAN双频天线的研究与设计

针对无线局域网(WLAN)通信技术的要求,设计了一副小型化WLAN双频天线。利用Hilbert分形曲线和倒L型加载分别在低频和高频段获得了98 MHz(2395 MHz～2503 MHz)和2 200 MHz(4160 MHz～6360 MHz)的阻抗带宽(S11≤10 dB)。制作了天线实物并测量,仿真与测试结果吻合良好,天线在工作频带内具有全向辐射性能。天线整体尺寸仅为0.16λl×0.128λl,非常有利于WLAN天线的小型化应用。     

基于复合辐射器的WLAN/WiMax多频CPW微带天线

提出了一种图形结构简单,可同时工作于WLAN和WiMax频段,且具有甚好的带宽性能的新型结构微带天线。该天线辐射器由三角形、矩形和圆形辐射单元组合而成,采用共面波导(CPW)进行馈电,并利用微扰量加载调谐天线的工作频率。由此设计制作的天线实测结果表明:在802.11b/g(2.4～2.4835GHz)频段,相对阻抗带宽为34%,回波损耗优于-10dB的频段覆盖为2.03～2.87GHz;在WiMax(3.4～3.7GHz)频段,相对阻抗带宽为37%,回波损耗优于-10dB的频段覆盖为3.17～4.37GHz;在802.11a(5.15～5.825GHz)频段回波损耗优于-10dB的频率范围覆盖为4.91～6.83GHz。该天线尺寸为65mm×50mm×2mm,可以集成应用于相关微波电路系统中。文中还给出了天线的设计尺寸,并对仿真和实测结果进行了对比与讨论。     

Dual broadband design of rectangular slot antenna for 2.4 and 5 GHz wireless communication

A novel dual broadband rectangular slot antenna for 2.4 and 5 GHz wireless local area network (WLAN) is proposed. With the use of a U-shaped strip inset at the centre of the rectangular slot antenna, the obtained impedance bandwidths for two operating bands can reach about 10.6% for the 2.4 GHz band and 33.8% for the 5 GHz band, which cover the required bandwidths of IEEE 802.11b/g (2.4-2.484 GHz) and IEEE 802.11a (5.150-5.950 GHz). Details of the antenna design and experimental results are presented and discussed.     

A compact microstrip fed dual polarised multiband antenna for IEEE 802.11 a/b/g/n/ac/ax applications

A compact microstrip fed dual polarised multiband monopole antenna for IEEE 802.11 a/b/g/n/ac/ax communication based applications is presented. The antenna is circularly polarised in IEEE 802.11 b/g bands while linearly polarised in IEEE 802.11 a/n/ac/ax bands. The asymmetric U-shaped slot in the ground plane of proposed antenna is used to introduce the necessary 90° phase shift between two orthogonal electric field vectors necessary for circular polarisation. The Ω-shaped slot on patch is used to introduce a band elimination notch between the usable frequency bands. The radiation characteristics of the proposed antenna (at 2.4 GHz) can be changed from left hand circular polarisation (LHCP) to right hand circular polarisation (RHCP) by replacing asymmetric U-shaped slot with its mirror image on the opposite side of ground plane. The proposed antenna has a wide impedance bandwidth of 110.8% and can also be used in various applications including worldwide interoperability for microwave access (WiMAX) and IEEE 802.11p standard based V2V (Vehicle to Vehicle) communication.     

共面耦合馈电小型化E-E形及半E-E形宽带微带天线

提出并设计了一种可应用于多频段无线通信的小型化宽带微带贴片天线.天线采用共面容性耦合的馈电方式补偿探针的分布电感,应用FR4高频介质板与空气层组成的层叠介质、E-E形和半E-E形辐射贴片缩减天线的尺寸.结果表明,E-E形微带天线和半E-E形微带天线的阻抗带宽分别为1.85～2.57 GHz(相对带宽32.6％)和1.85～2.50 GHz(相对带宽29.9％).和普通E形微带天线相比,E-E形和半E-E形微带天线的贴片面积缩小了47％和61％.     

Dual band microstrip patch antenna array loaded with split ring resonators and via holes

Reduction in antenna size by using multi-band radiators play a vital role in the miniaturization of present world wireless handheld devices, as dual band behaviour of the antennas result in the integration of more than one communication standard in a single system and thus, saving the installation space required for separate antennas. In this context, this communication presents a shorted-pin dual band metamaterial inspired microstrip patch antenna array. Under the unloaded conditions, the traditional patch antenna array resonates at 5.8 GHz with gain of 9.8 dBi and bandwidth of 540 MHz. However, when each patch of this traditional antenna array is loaded with split ring resonator (SRR) and a metallic via hole is introduced in the patch, the same antenna array produces an additional resonant frequency in IEEE 802.11b/g/n 2.45 GHz Wi-Fi band with bandwidth and gain of 290 MHz and 5.6 dBi, respectively, while the initial resonant frequency (i.e. 5.8 GHz) gets shifted to IEEE 802.11ac 5 GHz Wi-Fi band, providing the gain and bandwidth of 11.4 dBi and 510 MHz, respectively. The proposed antenna array has been fabricated, and the measured results are presented to validate the proposed array. Moreover, the equivalent circuit of the proposed antenna array has been designed and analyzed to validate the simulated, measured and theoretical results. Attainment of dual band characteristics by incorporating the metamaterial with single band traditional patch antenna array makes this structure novel, as this has been achieved without any extra hardware cost, size and loss of structural planarity. Also, both the frequency bands of this proposed metamaterial inspired antenna array possess considerable gain and bandwidth.     

一种新型具有双陷波特性的超宽带天线设计

本文提出了一种新型紧凑的具有双陷波特性的印刷超宽带天线。天线采用微带传输线馈电,并通过圆形与矩形 的混合结构辐射单元和带有矩形开槽结构的地板来实现天线的超宽带特性,工作带宽覆盖UWB 频率范围。通过地板上 两个对称的J 形开槽和微带馈线两侧对称添加的线型结构单元来实现双陷波特性,两个陷波频段刚好覆盖了3.5GHz 的 WIMAX 频段标准和5.2/5.8GHz 的WLAN 频段标准。同时,该天线在工作频带范围内具有良好的辐射特性,符合超宽带 通信的使用标准。     

Compact Dual Band Transversal Bandpass Filter With Multiple Transmission Zeros and Controllable Bandwidths

A compact microstrip dual band transversal bandpass filter (DBTBPF) using short-circuited stub loaded half-wavelength resonator and stepped impedance resonator is proposed. Multiple transmission zeros are created to improve the selectivity of the DBTBPF. Furthermore, the bandwidths of the proposed filter can be regulated in a relatively wide range. Two 2.4/5.2 GHz DBTBPFs with 192 MHz and 120 MHz absolute equal bandwidths, respectively, are designed. The measured results agree well with the simulations.      

Ultra-Wideband and Uni-Directional Radiation Slot Antenna for Multi-Band Wireless Communication Applications

In this paper, a ultra-wideband slot antenna is proposed and developed for multi-band wireless communication applications. The radiating slot is fed by a microstrip line with a microstrip fork shaped tuning stub and backed by a finite metallic reflector. The frequency characteristic and radiation performance of the proposed antenna are successfully optimized and the related prototypes are fabricated and tested. The measured results show that the impedance bandwidth can cover the band from 1.85 to 6.1 GHz with return loss of better than 10 dB. The obtained patterns display a high gain and uni-directional radiation patterns within interested bands. With these features, the proposed structure is suitable for application in wireless communication systems, where a single antenna is needed to operate at multi-bands simultaneously, such as PCS (1.85–1.99 GHz), UMTS (1.92–2.17 GHz) and all WLAN bands (2.4–2.48 GHz, and IEEE802.11a WLAN applications: 5.15–5.35 and 5.725–5.825 GHz).