一种五陷波超宽带天线的设计

为了在所需的多个陷波频带中获得额外的谐振频率,设计了一种具有五陷波特性的超宽带单极子天线,天线包括蚀刻了两个不封闭口字型槽的秤砣形贴片、矩形微带馈电线、缺陷接地板和两个类U形谐振器.将两个类U形谐振器耦合在馈电线附近,与辐射贴片上蚀刻的两个槽及缺陷接地板共同实现五陷波特性.该天线工作带宽为3.01～12 GHz,有效滤除了WiMAX通信频段(3.73～3.89 GHz)、C频段卫星通信系统(4.25～4.9 GHz)、无线局域网通信频段(5.51～5.83 GHz)、INSAT(Indian National Satellite System)频段(6.77～7.32 GHz)和ITU 8GHz频段(8.13～8.38 GHz)的干扰,且天线在通带频段内五个陷波特性和方向性结果均吻合良好.     

小型双频圆极化微带天线

随着卫星组合导航技术的发展,可同时接收多个频段信号的卫星接收天线的设计得到了广泛重视。设计了一种双频圆极化微带天线,该天线能够工作在GPS的L1(1.575 GHz)频段和RNSS B3(1.268 GHz)频段。该天线双层贴片之间采用相同的介电常数,天线使用单个探针馈电。与常规的双频圆极化微带天线相比,该天线在两层贴片之间没有空气层,因此天线尺寸小,结构更加紧凑,便于加工。     

新型共口径四频双圆极化微带天线的设计

提出了一种加载"牛角"形折线槽的贴片天线结构,通过调节折线槽尺寸,可灵活实现小频率比的双频设计。基于此设计了一种新型共口径四频双圆极化微带天线,仅利用三层堆叠结构实现了四个频段的覆盖,包括北斗三个频段B3(1 268±10)MHz、L(1 616±10)MHz、S(2 491±10)MHz和L波段的(1 995±10)MHz。仿真结果表明,天线在四个频段范围内均满足回波损耗小于–10 d B、轴比小于3 d B及基本的增益和波束宽度要求。天线两输入端口隔离度小于–15 d B,因此可用作北斗天线收发一体卫星通信终端应用。     

一种五频PIFA手机天线设计

提出了一种平面倒F五频手机天线,通过辐射贴片开缝和增加寄生单元,实现天线小型化和多频段需求。仿真结果表明,天线在回波损耗S11<–6 d B时,工作频段完全覆盖了GSM 900 MHz、DCS 1800 MHz、DCS 1900 MHz、LTE 2300 MHz和ISM 2450 MHz的所有频率,工作性能良好,且增益均大于2 d Bi。该天线结构简单易于实现,便于集成,可满足多频手机应用要求。     

基于3D打印技术的宽带圆形微带天线

该文介绍了一款环形耦合的圆形贴片天线。采用圆形金属贴片作为天线的辐射贴片,通过在介质板上引入两个谐振环,产生两个新的工作谐振频段。通过调节圆形贴片和耦合环之间的高度,进一步拓宽了天线的工作频段。通过3D打印技术对不规则的介质基板进行加工制作,有效解决了传统加工方法加工难度大及生产周期长的问题。测试结果表明,该天线在3.8~5.8 GHz工作频段内,回波损耗小于10 dB;在5.1 GHz时,天线增益达到8.4 dBi;天线相对带宽为42%,且具有良好的全向辐射特性。天线的测试结果与仿真结果基本吻合。     

一种容性馈电宽带微带天线的设计与分析

通过使用容性馈电贴片、短路面和短路探针,设计并分析了一种宽带微带天线.该天线的相对带宽达到47.3% (S11＜-10 dB),频段覆盖1.6～2.59 GHz.工作频段内的3个谐振频率形成了足够大的带宽.仿真结果表明,容性馈电贴片对辐射贴片表面电流的耦合效应会影响天线的性能,通过调节短路探针的位置可以获得稳定的辐射方向图.该天线的工作频段和特性符合无线通信系统应用的要求.     

非辐射边馈电的宽带双层微带贴片天线

介绍了一种非辐射边馈电的宽带双层微带贴片天线单元,并对其参数特性进行了仿真研究,结果表明,通过在寄生贴片上开3～5个与极化方向相平行的缝,可有效抑制天线的交叉极化,同时改善天线的阻抗带宽。相比传统双层微带贴片,该天线单元的阻抗带宽可提高3%以上,而交叉极化指标相当。当该单元应用于阵列天线设计时,可简化馈电网络,便于实现宽带、高效、大扫描角的微带共面馈电天线阵。对X波段8×8单元实验小阵的测试结果表明,该天线在17.6%的频段内具有良好的交叉极化性能及较高的工作效率。     

双频双极化微带共形天线

设计了一款工作在不同频率的双极化微带共形天线。首先,天线单元采用矩形微带贴片,并且通过改变贴片尺寸实现两种谐振频率;其次,改变两种单元的馈电方向,以此实现不同极化辐射;最后根据天线单元排布形式,设计了基于T 型功分器的馈电网络。根据最终的仿真结果,加工了天线实验样机。在工作带宽内,天线1、2 不圆度为分别为3. 56dB 和3. 98dB,增益分别为1.1dBi 和0.85dBi。通过比对,实测结果与仿真结果一致性较好,达到了预期目标。     

一种单空气介质层GNSS测量型天线设计

本文设计了一款单空气介质层测量型有源贴片天线,天线结构采用单层空气介质作为全球卫星导航系统(GNSS)贴片天线高低频段的电场辐射层,通过对高频贴片外边缘锯齿化处理和低频贴片内边缘锯齿化接地以及其外边缘设置锯齿辐射单元,使天线整体尺寸减小约20%。通过HFSS软件优化设计,实现了GNSS天线的成本低、体积小、增益高、轴比频带较宽、圆极化性能好等特点。同时,天线辐射贴片结构在设计上满足高低频相位中心高程差较小。本文所设计天线满足覆盖四大在运行卫星导航系统的高低信号频段,并且采用对称的四馈针馈电技术使得天线表现出良好的圆极化性能和相位中心稳定性,尤其适合于GNSS精确测量与精准定位系统终端设备。     

一种风车型多频贴片天线

提出了一种新型风车型多频天线, 该天线辐射贴片的结构类似于一个风车, 可以通过增加风车叶片的个数进而增加天线的工作频带数。利用数值模拟调节风车叶片的个数以及叶片的分布, 分别设计具有双频、三频以及四频的风车型贴片天线。此外, 通过在风车叶片上刻蚀单环和双环螺旋环结构的花纹, 可以改变天线的有效电流长度, 使得多频天线可以工作在UMTS (2. 1 GHz)、WLAN (2. 45 GHz)、Wimax (3. 5 GHz)以及X 频段卫星下行通信(7. 2 ~7. 6 GHz)等不同频段。最后, 实验结果与模拟结果一致, 具有较好的工程实用意义与价值。     

Dual-band dual polarised printed antenna element

A novel printed antenna element capable of providing dual polarised operation over two widely separated frequency bands is described. The element consists of a perforated proximity-fed microstrip patch antenna operating at the lower frequency, layered over a subarray of aperture coupled microstrip elements operating at the upper frequency. Results for a specific example operating at L and X bands (a frequency ratio of 8:1) are presented. The impedance bandwidth for both bands is >6%, with isolation within bands >20 dB and isolation between bands >40 dB. The element and feed network also has the advantage of being compact enough to be used in arrays, providing dual polarised dual-band operation from a single low-profile aperture     

Design of dual-polarized L-probe patch antenna arrays with high isolation

An experimental study of a dual-polarized L-probe patch antenna is presented. The antenna is designed to operate at around 1.8 GHz. A "dual-feed" technique is introduced to achieve high isolation between two input ports. The proposed antenna has an impedance bandwidth of 23.8% (SWR/spl les/2), 15% (SWR/spl les/1.5) and an isolation over 30 dB. In array designs, techniques for improving the isolation between two adjacent elements of an antenna array are also investigated. A two-element array with more than 30 dB isolation is designed and tested.     

一种应用于5G的紧凑型阵列天线设计

提出一种应用于5G的紧凑型阵列天线,由4个天线单元相互正交放置,通过在天线单元之间的上下两个平面分别添加4个二分之一波长的微带线,提高了天线单元间的隔离度。利用高频电磁仿真软件,对所提天线单元及阵列结构进行分析。实验结果表明,阵列天线的工作频段分别为2.72~3.92 GHz和4.74~5.42 GHz,在工作频段内各天线单元间的隔离度均低于-20 dB,完全覆盖5G所需的3.3~3.6 GHz和4.8~5.0 GHz两个工作频段。该阵列天线结构紧凑,体积仅为68.5 mm×68.5 mm×1.524 mm,能够被5G的小型化便携设备所应用。     

一种面向5G通信的宽带8单元MIMO天线设计

提出了一种面向5G的宽带8端口多输入多输出（multiple-input multiple-output,MIMO）天线.天线单元采用多枝节单极子结构,能够激发多模态,且能覆盖多频段.同时,采用弯折结构来实现小型化,且在相邻单元之间设计T形突出地结构来提高隔离度.仿真和实测结果显示,该天线在3~7.1 GHz内回波损耗大于10 dB,在3.3~7.1 GHz内隔离度高于15 dB.因为进行了有效的去耦,天线体现出明显的辐射分集特性,天线在目标sub-6 GHz频段内的包络相关系数（envelope correlation coefficient,ECC）接近0.在一8×8 MIMO系统中,计算得到的峰值遍历信道容量为43 bps/Hz,达到传统2×2 MIMO上限值的3.74倍.该8单元MIMO天线具有良好的分集和复用能力,能满足5G通信在sub-6 GHz的高速数据传输需要.     

Broadband dual-polarized patch antennas fed by capacitively coupledfeed and slot-coupled feed

Designs of broadband dual-polarized patch antennas fed by promising feed structures of a capacitively coupled feed and a slot-coupled feed (antenna A), two capacitively coupled feeds of a 180° phase shift and a slot-coupled feed (antenna B), and two capacitively coupled feeds of a 180° phase shift and two slot-coupled feeds (antenna C) are proposed and experimentally studied. The first two feed designs are for the excitation of a single-element broadband patch antenna, while the last design is for a two-element broadband patch antenna. These proposed patch antennas have a thick air substrate, and the 10 dB return-loss impedance bandwidths obtained for the two polarizations are all greater than 13%. High isolation (<-30 dB for antenna A, <-32 dB for antenna B, <-35 dB for antenna C) between the two feeding ports for the entire impedance bandwidth of the proposed antennas can be obtained. Also, improved cross-polarization levels (>20 dB) in both E and H plane patterns for the two polarizations of antennas B and C are achieved     

A reconfigurable wideband MIMO antenna combines RF energy harvesting

This article introduces a novel and groundbreaking approach combining multiple-input-multiple-output (MIMO) technology with radio frequency (RF) energy harvesting. The proposed antenna consists of two semi-circular monopole antenna components, optimized with dimensions of 89 × 51.02 × 1.6 mm³, that share a common ground plane to achieve MIMO characteristics. A series of split-ring resonators on the ground plane significantly enhances the isolation between the two radiating components. Band-notched features are performed in the 3.5 GHz WiMAX and 5.5 GHz WLAN bands through modified C-shaped slots in the radiating patch and two rectangular split-ring resonators serving as parasitic devices near the feed line. The reconfiguration of band-notching is made possible by controlling the modes of the embedded PIN diodes. The two antenna elements maintain mutual coupling below −18 dB from 1.5–13 GHz, achieving an impressive 158.62% impedance bandwidth. The antenna's efficiency and gain experience significant drop, indicating effective interference suppression at the center frequencies of the notch bands, and its performance in MIMO systems is assessed through parameters including envelope correlation coefficient, port isolation, radiation patterns, efficiency, gain, and diversity gain. The simulated properties of the designed antenna closely align with the measured outcomes, demonstrating its reliability and consistency. Moreover, the article evaluates the antenna's potential for RF energy harvesting, achieving a maximum harvested energy of 4.88 V. This proposed antenna can be used in multiple applications, like wideband, band-notching MIMO, and RF energy harvesting. This proposed antenna is an efficient, reconfigurable wideband MIMO antenna with novel RF energy harvesting capability.     

Design of a CPW-Fed Compact MIMO Antenna for Next Generation Vehicle to Everything (V2X) Communication

This article presents a compact Co-Planar Waveguide (CPW) fed antenna for next-generation Vehicular Communications. The antenna is designed by employing two rectangular stacked patch structures and slots, making the antenna resonate at dual frequency bands. The analytical study of antenna design is carried out using the governing microstrip patch equations. On optimizing the patch's dimensions for CPW structures, the desired frequency range of operation is obtained for the single element antenna structure. The designed antenna resonates at 3.5 GHz (LTE-42 Band) and 5.9 GHz (DSRC Band), yielding this antenna to be a prime component for Vehicular to Everything (V2X) Communication. The optimized single-element antenna structure is 35 mm?×?20 mm designed on an FR-4 substrate of thickness 1.6 mm. The substrate has a dielectric constant of 4.4 and a loss tangent value of 0.001. Further, the antenna structure is developed as a 4-element MIMO configuration with the distance between adjacent antenna elements to be 10 mm. The adjacent antennas in the MIMO configuration are positioned orthogonal to each other, thereby exhibiting better isolation between the antenna elements. The antenna has a reflection coefficient value of?<??10 dB within the bandwidth of interest and VSWR less than 2. The Gain value of the designed antenna ranges between 2.8 and 2.9 dBi at 3.5 GHz and between 3.6 and 3.7 dBi at 5.89 GHz. The overall efficiency of the antenna element is between 60 and 80% at both frequency bands. MIMO parameters are analyzed by calculating the Channel Capacity Loss (CL), Diversity Gain (DG), Envelope Correlation Coefficient (ECC) and Total Active Reflection Co-Efficient (TARC). The designed antenna is fabricated and tested, which shows the measured results coincide with the simulated antenna results. The overall dimension of the MIMO configured antenna design is 60 mm × 60 mm × 1.6 mm, which is highly compact and is a suitable candidate for deployment of Vehicle to Vehicle (V2V), Vehicle to Infrastructure (V2I), and Vehicle to Network (V2N) scenarios.

     

Wideband directional antenna system with different polarizations for wireless communication system

A novel directional antenna system with different polarizations is proposed for wireless communication system application in this paper. The proposed antenna employs modified E-shaped rectangular patch for vertical polarization and crossed dipoles for ±45° slant polarization. The vertically polarized (VP) element is formed by inserting a pair of wide slits at the boundary of rectangular patch with edge folded. The VP element is fed by using an L-probe feed, designed to work at the frequency range of 773–1013 MHz for GSM900 and other wireless communication systems such as GSM850 and LTE700 bands. Dual slant polarized (SP) elements are formed with two orthogonally situated dipoles with corner cut and slots on the patch, which yields a wide impedance bandwidth of 55.5% covering the frequency bands for 3G and LTE communication systems. A wideband diplexer is used to connect VP element and +45° SP element, forming a compact structure. Simulated and measured results show that peak gains of 8.0 dBi for VP element and 9.5 dBi for ±45° SP element, an isolation better than 26 dB over the working frequency bands are achieved. The cross-polarization levels in the azimuth plane for triple polarization states are lower than −14 dB.     

一种用于5G 移动通信终端的双频MIMO天线系统

为满足5G 移动通信系统对信道容量的要求,提出了一种应用于5G 移动终端的双频多输入多输出(MIMO)天线系统。它由沿移动终端两个长边垂直放置的八个天线单元组成。该天线系统可以覆盖中国工业和信息化部(MIIT)所规划的3.3 ~ 3.6 GHz 和4.8 ~ 5 GHz 两个频段,且低频段和高频段的天线效率分别高于61% 和50%。通过优化各天线的相对位置和放置方向,使得各端口之间的隔离度优于15 dB。为更好评估天线系统性能,计算了MIMO天线的包络相关系数(ECC)和信道容量(CC)。所得该MIMO 天线系统在工作频段内ECC均小于0.1,且信道容量峰值可以达到36.8 bps/ Hz。同时,制作并测量了MIMO 天线样品,测试结果与仿真结果表现出良好的一致性。     

Octagonal DGS based dual polarised ring-shaped antenna for MIMO communications

In this article, a dual polarised Microstrip patch antenna is proposed for 2*2 MIMO communications. The proposed antenna is suitable for GSM/DCS-1800 and LTE-1900 bands as diversity and multiple-input multiple-output (MIMO) antenna. Different from conventional MIMO antennas, the radiating aperture is shared among the radiators, which greatly reduces the overall size of the MIMO antenna system. An isolation enhancement of 30 dB between the input ports is achieved by integrating cross-connected octagonal shaped Defected Ground Structure to the ground plane. Furthermore, the Multi-antenna system performance metrics such as Envelope Correlation Co-efficient, diversity gain and Mean Effective Gain, and Total Active Reflection Co-efficient are also computed. The Proposed antenna shows a gain of 3.63 dBi at 1950 MHz. The simulated and measured results demonstrate that the proposed antenna has good impedance matching, isolation and dual polarisation characteristics. From the performance metrics, the proposed antenna performs well in multipath environment.