共查询到19条相似文献,搜索用时 140 毫秒
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本文提出了一个陷波可重构的超宽带单极天线.为了实现超宽带,辐射单元采用阶梯式结构.在辐射单元刻蚀一个开口缝隙,并在缝隙的适当位置放置三个开关,通过控制开关的不同组合状态实现陷波可重构.天线的尺寸为30mm×22mm(0.42λg×0.31λg,λg为低频导波波长).仿真和测量结果表明:天线可以工作在超宽带以及3个陷波可重构频段,超宽带工作频带为3.1GHz~10.7GHz,陷波频段涵盖3.4GHz~3.69GHz,3.7GHz~4.2GHz和5.2GHz~5.875GHz. 相似文献
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本文设计了一种小型化差分双频微带天线.天线辐射单元由方环形结构和1对叉形结构组成,低频由方环形结构和叉形结构共同决定,高频主要由内部叉形结构决定.天线辐射单元总尺寸为18 mm×18 mm(0.31λg×0.31λg,λg为低频导波波长),比传统半波长微带天线减小了38%.仿真和测量结果表明,天线可以工作在2.45 GHz和5.25 GHz,低频和高频段带宽分别为4.5%(2.39 GHz~2.5 GHz)和4.8%(5.1 GHz~5.35 GHz),峰值增益分别为2 d Bi和4.3 d Bi,适用于WLAN(Wireless Local Area Network)的应用. 相似文献
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提出一种新型的多边形结构宽带微带天线。此天线拥有体积小、剖面低、重量轻、结构简单等。采用ansoft公司的基于时域有限差分法(FDTD)的HFSS12电磁仿真软件对该天线进行了仿真。从仿真结果上看,该微带天线的中心频率10GHz,S11≤-10dB时的相对带宽147%(3.0GHz~20.0GHz),可以有效的覆盖到S、C、X、Ku各个波段以及3GHz到6GHz各个移动通信频段,也可用于各种无线局域网等场合。该天线的平均增益3dB,最高增益达到5dB。 相似文献
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设计一种新颖的平面宽带单极天线。该天线由矩形平板单极天线变形而来,通过U形槽、增加和折叠天线两臂,实现小型化、多模和低驻波比特性(在1.71~1.96GHz和2.38~6.37GHz频段内VSWR小于2)。通过CST软件进行仿真,分析各谐振的电流分布和谐振长度。该天线结构简单,尺寸较小(60mm×20mm),制作容易,可用于GSM/WLAN/WIMAX应用。通过加工测试,天线的仿真结果和实测结果非常吻合。 相似文献
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《测试技术学报》2017,(5)
针对应用于WLAN/WIMAX的双频和三频天线,通过构造6/9形辐射贴片和接地板开槽的方式,本文设计了一款结构简单的6/9形宽频带单极子天线.仿真结果表明:天线低频的相对带宽为14.8%(2.36~2.73 GHz),高频的相对带宽为52.8%(3.463~5.944 GHz).天线可同时接受WLAN(2.5/5.2/5.8GHz)和WIMAX(3.5/5.5GHz)等多个频率.在整个工作频带内天线的电压驻波比小于2.实测结果表明,加工的天线低频的谐振频率为2.58GHz,工作带宽为2.33~2.9GHz,相对带宽为22.1%(是仿真天线的1.46倍);高频的谐振频率为4.705GHz,工作带宽为3.45~5.96GHz,相对带宽为53.4%(是仿真天线的1.06倍),加工的天线比仿真模型的频段更宽.实现了一个结构简单且易于加工的天线设计,可以很好地接受WLAN/WIMAX的多个频率,且有较好的辐射特性,提高了天线的性能. 相似文献
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本文采用了部分均匀覆盖层,设计了一款新型的高增益Fabry-Perot谐振腔天线.该天线覆盖层采用部分均匀结构,划分为3×3个区域,不同区域内贴片的尺寸不尽相同.每个区域内包含5×5个矩形贴片,单元尺寸一致.由于各区域的贴片尺寸不同,使得部分反射层不同区域内的反射系数和透射系数也不同,从而改善了天线口径面上的幅度和相位的均匀度.仿真结果表明,天线的阻抗带宽(|S_(11)|-10 dB)为3.77%(5.72~5.94 GHz).在工作频率5.8 GHz处,天线的主交叉极化相差30 dB以上,增益达到19.9 dBi. 相似文献
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Naeem Ahmad Jan Saad Hassan Kiani Daniyal Ali Sehrai Muhammad Rizwan Anjum Amjad Iqbal Mujeeb Abdullah Sunghwan Kim 《计算机、材料和连续体(英文)》2021,66(1):35-49
In this paper, a low cost, highly efficient and low profile monopole
antenna for ultra-wideband (UWB) applications is presented. A new inverted triangular-shape structure possessing meander lines is designed to achieve a wideband response and high efficiency. To design the proposed structure, three steps
are utilized to achieve an UWB response. The bandwidth of the proposed antenna
is improved with changing meander lines parameters, miniaturization of the
ground width and optimization of the feeding line. The measured and simulated
frequency band ranges from 3.2 to 12 GHz, while the radiation patterns are measured at 4, 5.3, 6 and 8 GHz frequency bands. The overall volume of the proposed
antenna is 26 × 25 × 1.6 mm3
; whereas the FR4 material is used as a substrate
with a relative permittivity and loss tangent of 4.3 and 0.025, correspondingly.
The peak gain of 4 dB is achieved with a radiation efficiency of 80 to 98% for
the entire wideband. Design modelling of proposed antenna is performed in
ANSYS HFSS 13 software. A decent consistency between the simulated and
measured results is accomplished which shows that the proposed antenna is a
potential candidate for the UWB applications. 相似文献
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M. Inam M. H. Dahri M. R. Kamarudin A. Y. I. Ashyap M. H. Jamaluddin N. H. Sulaiman M. A. Khan Z. A. Shamsan K. Almuhanna F. Alorifi 《计算机、材料和连续体(英文)》2022,72(2):2397-2410
This work provides the design and analysis of a single layer, linearly polarized millimeter wave reflectarray antenna with mutual coupling optimization. Detailed analysis was carried out at 26 GHz design frequency using the simulations of the reflectarray unit cells as well as the periodic reflectarray antenna. The simulated results were verified by the scattering parameter and far-field measurements of the unit cell and periodic arrays, respectively. A close agreement between the simulated and measured results was observed in all the cases. Apart from the unit cells and reflectarray, the waveguide and horn antenna were also fabricated to be used in the measurements. The measured scattering parameter results of the proposed circular ring unit cells provided a maximum reflection loss of 2.8 dB with phase errors below 10°. On the other hand, the measured far-field results of the 20 × 20 reflectarray antenna provided a maximum gain of 26.45 dB with a maximum 3 dB beam width of 12° and 1 dB gain drop bandwidth of 13.1%. The performance demonstrated by the proposed reflectarray antenna makes it a potential candidate to be used in modern-day applications such as 5th Generation (5G) and 6th Generation (6G) communication systems. 相似文献
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Md. Amanath Ullah Touhidul Alam Ali F. Almutairi Mohammad Tariqul Islam 《计算机、材料和连续体(英文)》2022,71(2):2533-2542
This paper reveals a new design of UHF CubeSat antenna based on a modified Planar Inverted F Antenna (PIFA) for CubeSat communication. The design utilizes a CubeSat face as the ground plane. There is a gap of 5 mm beneath the radiating element that facilitates the design providing with space for solar panels. The prototype is fabricated using Aluminum metal sheet and measured. The antenna achieved resonance at 419 MHz. Response of the antenna has been investigated after placing a solar panel. Lossy properties of solar panels made the resonance shift about 20 MHz. This design addresses the frequency shifting issue after placing the antenna with the CubeSat body. This phenomenon has been analyzed considering a typical 1U and 2U CubeSat body with the antenna. The antenna achieved a positive realized gain of 0.7 dB and approximately 78% of efficiency at the resonant frequency with providing 85% of open space for solar irradiance onto the solar panel. 相似文献
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为了有效抑制双倍频对2.4 GHz无线通信干扰,采用滤波馈电网络与天线振子一体设计技术,设计一种具有滤波功能的多层结构天线,使天线在2.4~2.5 GHz时,信号可以几乎无衰减地通过;而在4.8~6 GHz频段,信号被抑制,对邻频干扰也有一定的抑制作用,使干扰信号在天线等前端设备受到较大衰减,从而改善了通信质量.仿真与测试结果表明,在2.4~2.5 GHz频段滤波天线回波损耗小于-16 dB,驻波比小于1.4;在4.8~6 GHz频段滤波天线回波损耗大于-6.6 dB,驻波比大于2.7.该蓝牙微带天线具有较好的传输特性和滤波功能,满足蓝牙通信传输特性需要. 相似文献
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利用矩量法的粗振子模型分析了粗振子天线,并分别对长度为500mm,半径各为1mm、5mm、10mm、50mm的对称振子进行计算,通过计算结果的比较得出了振子的粗细对天线性能的影响.实用中可以根据对天线性能的要求,选择合适粗细的对称振子天线。 相似文献
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给出了既有双稳态特性又具有天线功能的多功能复合材料层板设计与分析方法。基于非线性层板理论和Rayleigh-Ritz法,建立了双稳态混杂层板构型预报理论模型,并通过有限元计算和实验进行了验证。研究了薄膜天线混杂非对称双稳态复合材料层板的临界载荷及电磁性能,分析了铺层方式对双稳态混杂层板稳定构型、临界载荷和电磁性能的影响。结果表明:双稳态混杂层板通过转变其稳定构型实现天线主辐射方向在俯仰面内偏转30°,实现方向图可重构,扩大天线波束的扫描范围。铺层方式对层板构型和反射系数影响较大,当天线辐射层铺设在层板表面且聚酰亚胺薄膜厚度大于0.2 mm时,其双稳态特性消失,没有出现分叉现象,且其中心频率会左移大约0.2 GHz。 相似文献
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Ahmed Jamal Abdullah Al-Gburi Zahriladha Zakaria Merih Palandoken Imran Mohd Ibrahim A. A. Althuwayb Sarosh Ahmad Samir Salem Al-Bawri 《计算机、材料和连续体(英文)》2022,73(2):2785-2799
This article introduces a novel, ultrawideband (UWB) planar monopole antenna printed on Roger RT/5880 substrate in a compact size for small Internet of Things (IoT) applications. The total electrical dimensions of the proposed compact UWB antenna are 0.19 λo × 0.215 λo × 0.0196 λo with the overall physical sizes of 15 mm × 17 mm × 1.548 mm at the lower resonance frequency of 3.8 GHz. The planar monopole antenna is fed through the linearly tapered microstrip line on a partially structured ground plane to achieve optimum impedance matching for UWB operation. The proposed compact UWB antenna has an operation bandwidth of 9.53 GHz from 3.026 GHz up to 12.556 GHz at −10 dB return loss with a fractional bandwidth (FBW) of about 122%. The numerically computed and experimentally measured results agree well in between. A detailed time-domain analysis is additionally accomplished to verify the radiation efficiency of the proposed antenna design for the ultra-wideband signal propagation. The fabricated prototype of a compact UWB antenna exhibits an omnidirectional radiation pattern with the low peak measured gain required of 2.55 dBi at 10 GHz and promising radiation efficiency of 90%. The proposed compact planar antenna has technical potential to be utilized in UWB and IoT applications. 相似文献
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Wasi Ur Rehman Khan Muhammad Fawad Khan Muhammad Irfan Sadiq Ullah Naveed Mufti Usman Ali Rizwan Ullah Fazal Muhammad Saifur Rahman Faisal Althobiani Mohammed Alshareef Mohammad E. Gommosani 《计算机、材料和连续体(英文)》2023,74(2):2517-2530
A compact, reconfigurable antenna supporting multiple wireless services with a minimum number of switches is found lacking in literature and the same became the focus and outcome of this work. It was achieved by designing a Th-Shaped frequency reconfigurable multi-band microstrip planar antenna, based on use of a single switch within the radiating structure of the antenna. Three frequency bands (i.e., 2007–2501 MHz, 3660–3983 MHz and 9341–1046 MHz) can be operated with the switch in the ON switch state. In the OFF state of the switch, the antenna operates within the 2577–3280 MHz and 9379–1033 MHz Bands. The proposed antenna shows an acceptable input impedance match with Voltage Standing Wave Ratio (VSWR) less than 1.2. The peak radiation efficiency of the antenna is 82%. A reasonable gain is obtained from 1.22 to 3.31 dB within the operating bands is achieved. The proposed antenna supports Universal Mobile Telecommunication System (UMTS)-1920 to 2170 MHz, Worldwide Interoperability and Microwave Access (WiMAX)/Wireless Broadband/(Long Term Evolution) LTE2500–2500 to 2690 MHz, Fifth Generation (5G)-2500/3500 MHz, Wireless Fidelity (Wi-Fi)/ Bluetooth-2400 to 2480 MHz, and Satellite communication applications in X-Band-8000 to 12000 MHz. The overall planar dimension of the proposed antenna is 40 × 20 mm2. The antenna was designed, along with the parametric study, using Electromagnetic (EM) simulation tool. The antenna prototype is fabricated for experimental validation with the simulated results. The proposed antenna is low profile, tunable, lightweight, cheap to fabricate and highly efficient and hence is deemed suitable for use in modern wireless communication electronic devices. 相似文献