基于覆盖LTE700的手机天线设计的文献综述

当前手机通信行业3G和4G通信技术的发展已经成为主流,而LTE是3G的演进,属于3G和4G技术之间的过渡。发展LTE的关键是频率,而在低频段只有700MHz是最佳频段。国际上颁布的3GPPR10标准已经把698M~806MHz的108MHz带宽确定为LTE700。给出了国外手机天线设计文献中能够覆盖LTE700的几篇文献进行分析和综述,说明其主要天线结构和特点以及低频段能够覆盖LTE700所采用的设计方法。     

飞思卡尔推出首款2W功率放大器

<正>可为单个5 V器件提供频率范围、增益和功率特性,实现了一个设备覆盖1 500 MHz² 700 MHz频段射频功率晶体管领域的全球领导者飞思卡尔半导体公司日前推出首款2 W集成式功率放大器,采用5 V电源,可提供超过40 dB的增益,可覆盖1 500 MHz2 700 MHz频段射频功率晶体管领域的全球领导者飞思卡尔半导体公司日前推出首款2 W集成式功率放大器,采用5 V电源,可提供超过40 dB的增益,可覆盖1 500 MHz² 700 MHz的所有频段。该组件可支持在该频率下运行的任何蜂窝标准,其中包括GSM、3G、4G和LTE。     

一种用于5G终端天线设计及辐射性能分析

随着移动通信技术的飞速发展，市场对手机天线的性能提出了更高的要求，表现为小型化、多频带上。本论文在研究手机天线理论和分析方法的基础上，针对当前手机天线的研究热点和趋势，借助基于FEM（有限元）方法的电磁仿真软件Ansoft HFSS建立了多频段天线手机天线，体积小，结构简单，在满足VSWR（回波损耗）为3:1时可覆盖GSM-850/900、PCS-1900、UMTS-2000、LTE2300/2500多个频段，辐射特性良好，900MHz增益最大为12.905dB,3.5GHz增益为6.4921dB，可满足增益需求。     

一种小型化宽频基站天线设计

随着无线通信技术的迅速发展,为了满足2G/3G/4G频段的覆盖,同时减小天线尺寸,本文提出了一种小型化宽频基站天线.该天线由一个低频辐射单元和高频辐射单元同轴嵌套而成,±45°双极化,低频辐射单元由两对偶极子构成,通过共用偶极子臂和辐射臂弯折,来实现天线小型化。天线仿真的-15dB阻抗频带为694-960MHz(相对带宽为32%)和1695-2690MHz(相对带宽为45.5%),轴向交叉极化大于33dB,频带宽,尺寸小,增益比较高,满足2G/3G/4G通信系统的需求。     

一种适用于航空货运的双频RFID标签天线设计

为满足在航空货物运输中射频识别(RFID)标签双频段工作的需要,文章提出了一种基于缝隙耦合结构的偶极子天线。所设计的天线满足-10dB回波损耗带宽在ISO18000-6频段是840MHz到940MHz(11%),在ISO18000-4频段是2.26GHz到2.56GHz(12%)。回波损耗的仿真结果和实际测量结构吻合良好。工作在900MHz和2.45GHz时能获得较好的方向图。     

穿戴系统中的天线设计

采用U型缝加载技术,设计了一种用于穿戴系统的双频平面倒F天线(PIFA),分别工作于GSM(全球通)的900 MHz和WLAN(无线局域网)的2.45 GHz频段,两个频段的相对阻抗带宽分别为10%和5%;在两个谐振频点处,天线的增益分别为0.4 dBi和1.7 dBi.天线具有低剖面结构、重量轻、结构简单等优点,完全满足穿戴系统中长、短距离无线通信要求.     

一种用于5G通信的双极化水平全向天线

目前,5G应用已迫在眉睫。笔者设计了一款由三天线单元组成的±45°极化水平全向天线,单元之间采用一分三功分器进行馈电,并利用HFSS软件进行仿真。经实际测验,3300～3800MHz所需频段,天线驻波小于1.8,覆盖了LTE 3400(3 400～3 600 MHz)和5G的Sub-6 GHz(3 300～3 600 MHz)频段,端口隔离小于-20 dB,天线在工作频段内的增益大于1.5 dBi,圆度小于5 dB。     

一种新型EBG低剖面的微带基站天线设计

设计了一种工作在LTE及5G频段的新型微带基站天线,该天线通过在反射背板上加载新型EBG的方法,既满足天线的工作带宽及辐射增益,还达到了降低天线剖面高度的作用,将天线的高度从40 mm降低至22 mm。该基站天线的工作频带为1.65～3 GHz,阻抗带宽达到了1.351 GHz,阻抗带宽达到58%,在2.1 GHz频率上天线的方向性系数为8.13 dBi。研究证明,贴片在反射背板上加载EBG结构可以有效降低天线高度。     

富士通半导体推出收发器家族全新LTE优化多频单芯片MB86L13A

<正>新品多频4G LTE收发器专为智能手机及其他移动应用而设计富士通半导体(上海)有限公司近日宣布推出MB86L13A LTE(FDD和TDD)优化收发器。该全新收发器为面向LTE专向应用开发,采用富士通开拓的RFIC设计架构,无需外部的低噪声放大器(LNAs)和级间声表面波(SAW)滤波器,可覆盖700MHz～2700MHz的频谱。该全新设备与上个月发布     

基于PSO的E型双频天线自适应优化设计

研究天线性能优化问题,为了满足多个无线通信系统实现多系统收发共用,天线需在宽频带及不同频段下工作.为了得到优化的谐振频率和宽带,通过在矩形微带线上开两条对称的槽得到E型贴片天线,实现天线的双频功能,利用电磁仿真软件IE3D建立天线模型,通过IE3D对天线的性能进行仿真和分析,同时使用粒子群优化算法对其关键性参数进行了自适应优化,得出天线的具体尺寸.仿真结果表明,天线-10dB阻抗带宽分别为125 MHz(2400-2525MHz)和275MHz(5575-5850MHz),能够满足WLAN(2400-2484 MHz/5725-5825 MHz)的通信需求.优化的天线结构简单,具有很好的双频特性,在工作带宽内有很好的全向辐射特性.     

Compact dual‐band antenna based on CRLH‐TL for WWAN/LTE terminal applications

In this article, a compact dual‐band antenna based on composite right/left‐handed transmission line (CRLH‐TL) is proposed for WWAN/LTE wireless terminal applications. By using 2 symmetrical CRLH structures, the proposed antenna can easily produce 2 wide separate operating frequency bands with a compact size of 25 × 25 × 6 mm³. Additionally, a pair of matching strips is introduced on both sides of the feeding line to further improve the impedance characteristics of the terminal antenna. The experimental results demonstrate the proposed antenna is capable of working over the frequency ranges of 0.66‐1.06 GHz and 1.68‐2.88 GHz with |S₁₁| < ?6 dB, which can cover the bands of LTE700, GSM850, GSM900, GSM1800, GSM1900, UMTS, LTE2300, and LTE2500 for wireless terminals. Moreover, the multiple input multiple output (MIMO) operating performance of the proposed antenna element is also studied, and an enhanced isolation between the antenna elements is obtained by utilizing the defected ground structures and grounded branches.     

Dual‐feed full‐metal‐case antenna for WWAN/LTE smartphone applications

A dual‐feed small size full‐metal‐case (FMC) antenna for hepta‐band LTE/WWAN operation in smartphone applications is presented. The antenna proposed here is an integrated part of the full metal case located at the top edge of the smartphone, and it only occupies a small volume of 5 mm × 70 mm × 6 mm. It has two feeding ports that are separately connected to an ON/OFF switch (SW1 and SW2) for controlling the lower and higher operation bands, respectively. For the case when SW1 (ON) and SW2 (OFF), Port‐1 is engaged, and a lower operating band that covers the GSM850/900 operation (824–960 MHz) is achieved. In contrast, Port‐2 will be engaged for the case when SW1 (OFF) and SW2 (ON), and with the aid of a wideband matching circuit, the antenna can induce a higher operating band that can cover the DCS/PCS/UMTS2100/LTE2300/LTE2500 operations (1690–2690 MHz). Detailed design considerations of the proposed FMC antenna are described, and both experimental and simulation results are also presented and discussed. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:595–601, 2016.     

Dual antenna system for metal frame mobile phone applications

A dual antenna system with 77 mm × 10 mm × 7.5 mm for metal frame (MF) LTE/GPS mobile phones is proposed and studied. The antenna proposed in this study comprises two antenna elements (Ant 1 and Ant 2) and a decoupling line. Ant 1 as the main antenna that covers the lower band (698‐960 MHz), the GPS band, and the higher band (1710‐2690 MHz) consisting of a ground branch, a coupled line, and a tuning line. Ant 2 as the auxiliary antenna that covers the higher band consisting of a monopole branch and a match circuit. Ant 1 and Ant 2 form a two‐element MIMO antenna covering the higher band. The advantages of the proposed antenna are that the main antenna (Ant 1) covers the GPS band and all of the 2G/3G/4G bands, and the two‐element MIMO antenna covering the higher band, which consists of Ant 1 and Ant 2 located at the same side of a mobile phone with an MF, is obtained. A prototype is manufactured and tested. For Ant 1, the measured working bands (under ?6 dB condition) are 685 to 965 MHz and 1480 to 2800 MHz, and the LTE700, GSM850, GSM900, GPS, GSM1800, GSM1900, UMTS, LTE2300, and LTE2500 bands are covered. For Ant 2, the measured working band (under ?6 dB condition) is 1640 to 2720 MHz, and the GSM1800, GSM1900, UMTS, LTE2300, and LTE2500 bands are covered. The measured isolations between Ant 1 and Ant 2 are larger than 12 dB at the working bands. The measured efficiencies, envelope correlation coefficients, and mean effective gains are also presented.     

Design of multi‐band antenna for LTE wearable device with shared slots and radiators for smart watch

In this study, multi‐band antenna for LTE wearable device with shared slots and radiators for smart watch was present. This study incorporated 4G communication frequency bands, a GPS positioning system, and BT/Wi‐Fi in a 43.6 × 43.6 × 5.8 mm³ metal case to achieve satisfactory radiation fields and performance efficiency within a small space. This article presents an overview of the theory. There are four ports in the system. Frist, Port 1 is a low‐frequency antenna offering LTE 700 and GSM 850/900. The maximal gain and efficiency are respectively 3.9 dBi and 82%. Second, Port 2 is a high‐frequency monopole with a winding long path on the side of the frame to achieve a reflection loss bandwidth that fully encompasses GSM 1800/1900/UMTS and LTE 2300/2500. The maximal gain and efficiency of this port are respectively 5.3 dBi and 92%. There are also have GPS (Port 3) and Wi‐Fi (Port 4) antenna implement IFA and loop excitation mechanisms, respectively. This antenna system can fulfill the market demand. As confirmed through both simulation and measurement, the antenna can cover LTE bands. Increasing the path capacity of a MIMO system to increase the transmission speed is a crucial focus in mobile communication research and development.     

A compact uniplanar antenna for nine‐band LTE/WWAN operation in tablet computers

A compact uniplanar dual wideband antenna for tablet computers is presented. The proposed antenna provides full coverage of LTE700/2300/2500, GSM850/900/1800/1900, UMTS2100, Bluetooth, and 2.4‐GHz WLAN bands with a very small foot print 30 × 10 mm². The antenna has uniplanar structure and is easy to fabricate on single side of 0.8‐mm thick FR4 substrate. This is achieved through three optimized strips: a feeding strip, an inductively coupled inverted L‐shaped strip, and a shorted strip embedded with SMT components. The proposed design supports more than eight operating bands in 3:1 VSWR standard, exhibiting positive gains over all nine bands of operation and 80%–90% radiation efficiency in the higher LTE and WWAN bands. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:496–502, 2016.     

Compact nine‐band antenna for 4G/5G smartphones

This article presents a nine‐band antenna whose size is 70 mm × 7 mm × 5.8 mm for 4G/5G smartphones. The proposed antenna consists of a T‐shape coupled line and two ground branches. The T‐shape coupled line is used to produce the resonances at about 925 and 2900 MHz respectively. One ground branch along with the T‐shape coupled line is used to cover the lower band (698‐960 MHz), and the other ground branch is used to cover the 3.6 GHz band (3400‐3800 MHz). By using the higher order modes of the T‐shape coupled line and the ground branches, the higher band (1710‐2690 MHz) is covered. The advantage of the proposed antenna is that a nine‐band antenna can be realized with an only 7 mm ground clearance and without using any lumped element. A prototype is manufactured and measured. According to the measured results, at the bands of 0.693‐0.98 GHz, 1.69‐2.94 GHz, and 3.05‐4 GHz, the S11 are smaller than ?6 dB. The ?6 dB impedance operating frequency band of the proposed antenna can cover the LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, LTE2500, and 3.6 GHz bands. The simulated and measured results of the radiation performance also are presented.     

Compact thirteen‐band antenna for 4G/5G/WLAN metal frame mobile phones

An antenna which can cover 13 bands for 4G/5G/WLAN mobile phones including metal frames and has the size of 70 mm × 7 mm × 7 mm is proposed and studied. It comprises four ground branches and a coupled line. The merit of the antenna proposed in this article is that it can cover 13 bands under the condition of a metal frame environment and a 7 mm ground clearance. The prototype of the proposed antenna is fabricated and tested. The measured impedance bandwidths (reflection coefficient less than ?6 dB) are 315 MHz (0.680‐0.995 GHz), 1.1 GHz (1.67‐2.77 GHz), 0.65 GHz (3.25‐3.9 GHz), and 1.35 GHz (4.55‐5.9 GHz). The LTE700, LTE2300, LTE2500, UMTS, GSM850, GSM900, GSM1800, and GSM1900 bands for 4G/3G/2G systems, the 3.5 GHz and 4.8 GHz bands for 5G system, and the 2.4 GHz, 5.2 GHz and 5.8 GHz bands for the WLAN system are covered. The measured efficiencies and patterns are also presented.     

A novel uniplanar antenna with dual wideband characteristics for tablet/laptop applications

A novel uniplanar antenna design for tablet/laptop applications is proposed. The proposed antenna with a size of 68 × 12 × 0.8 mm³ is comprised of three strip sections, namely, the feeding strip, parasitic shorted strip, and tuning stub strip (or printed LC matching circuit). Five resonant modes are induced by the proposed antenna, and they are combined to yield two wide operating bands that have 6‐dB return loss bandwidths of more than 50% (695‐1190 MHz and 1690‐2930 MHz). Thus, the proposed antenna can easily cover the entire LTE/WWAN operations working in the 698‐960 MHz and 1710‐2690 MHz bands. Besides demonstrating good radiation efficiency of more than 60% for the two wide operating bands, the proposed antenna also exhibits reduced ground effects, in which reducing the ground size will not deteriorate the antenna's performances.     

Dual‐band circularly polarized multiple‐input multiple‐output antenna for GSM and lower LTE applications

A circularly polarized multiple‐input multiple‐output (MIMO) antenna is presented for global system for mobile (GSM) (710 MHz) and lower long term evolution (LTE) (900 MHz) frequency bands. The antenna consists of four ports with four impedance transformers on the bottom substrate and elliptical rings on the upper substrates. Impedance transformers include open stub and irregular microstrip lines in order to control impedance matching and resonant frequencies. Two upper substrates that contain orthogonal elliptical rings cause the circular polarization property of the proposed antenna. The results of measurement for the presented antenna show its performance with S‐parameters of less than ?10 dB in the frequency ranges of 699‐750 MHz for GSM and 880‐1115 MHz for lower LTE applications. Also, the gain and radiation efficiency are higher than 5dBi and 70%, respectively.     

一种新型3G系统超宽带室内双向天线研究

设计了一种用于第三代移动通信系统的新型室内双向天线。通过采用渐变球激励的形式,解决了环形天线平衡馈电和阻抗匹配的问题,在节省复杂匹配网络的同时得到了很宽的工作带宽,不需附加额外的匹配网络,天线电压驻波比小于1.5时,阻抗带宽达到100%。天线工作在800 MHz~2 500 MHz,低频段增益可达5 dBi,高频段增益可达8 dBi,满足2G和3G移动室内通信在商务写字楼和宾馆酒店走廊两侧覆盖要求,与现有采用全向天线覆盖的方法相比可有效降低室内移动通信网络的建设成本,提高整个通信网络的容量和质量。