宽带平面单极天线

提出了一种宽带平面单极天线,其辐射单元为底部具有斜切角的矩形铜片,馈电点偏离辐射单元的中心位置,斜切角和不对称馈电的应用有效地扩展了带宽.用Ansoft HFSS软件对天线尺寸、斜切角和馈电点位置等参数对天线特性的影响作了分析,给出了这些参数的最佳值,并根据这些最佳参数制作了天线样机.以电压驻波比小于3.5:1为标准,实测得到的天线带宽为70～3000 MHz.电压驻波比和方向图的测量结果与仿真结果吻合较好.     

A printed dual-wideband magneto-electric dipole antenna for WWAN/LTE applications

A planar-printed dual-wideband U-shaped magneto-electric dipole omnidirectional antenna with a composite feeding structure for WWAN/LTE applications is proposed. Firstly, a U-shaped electric dipole structure is presented to provide a dual-wideband by changing the surface-current distributions. In addition, in order to reduce antenna size and improve impedance matching, a new feeding structure designed with inverted U-shaped tapered line and meandering T-shaped line is introduced. Finally, instead of a conventional vertical ground plane, a small-size one is printed on the reverse side of the substrate to achieve stable gains and omnidirectional radiation patterns. The antenna prototype can attain a bandwidth of 35.8% (0.78–1.12 GHz) with a stable gain of 3 ± 0.5 dBi for the lower band, and a bandwidth of 50.5% (1.66–2.78 GHz) with a gain of 3.8 ± 0.6 dBi for the upper band, covering the frequency bands granted for WWAN/LTE systems. To the best of our knowledge, it is the first real-sense planar magneto-electric dipole antenna proposed. In comparison with the existing ME dipole antennas, the proposed antenna, which is planar-printed on a small-size FR4 substrate with a simple structure, can be easily fabricated at low cost and thus is promising for WWAN/LTE communication.     

小型化准分形加载单极子天线

提出了一种小型化宽带加载单极子天线,即对有顶部加载的单极子天线进行准分形和RLC集总加载.研究表明准分形可以有效地降低天线的谐振频率,提高辐射能力.准分形加载单极子天线和三维分形树单极子天线相比,结构非常简单,容易实现,和典型的加载单极子天线相比,天线的电尺寸要小得多.对准分形加载单极子模型天线进行了测试,实测结果和仿真结果比较一致.加入匹配网络后,可得到10:1的带宽.     

无线局域网应用的接地平面单极天线的设计

提出了一种应用于无线局域网(WLAN)的新型低成本多频段天线,采用斜切角接地的平面单极结构,天线顶部折返成水平面内的两个对称矩形单元来降低高度。同时,通过在垂直辐射单元表面开L形槽的方法,实现了无线局域网高低两个工作频段覆盖的需求。天线在各工作频段内具有良好的全向辐射特性。实测和仿真结果基本吻合,从而验证了这种设计方法的有效性。     

一种新型超宽带单极子天线设计与仿真

通过单极子和高介电常数(相对介电常数为38)陶瓷介质谐振器的耦合设计了一种新型类齿状UWB单极子天线,以实现天线超宽频带的目的。采用软件HFSS进行仿真,并对天线模型参数进行优化,得到最佳设计效果。结果表明,该天线频带宽度为2.6~20.0 GHz(S11≤–10 dB),相对带宽达到了154%,满足超宽带天线要求。该天线实现小型化超宽带的同时,在整个UWB匹配频段内,具有良好的驻波比和方向图特性,较好地兼顾了各方面的性能。     

一款多频段小型单极子天线的设计

设计了一款多频段小型宽带单极子天线。采用Ansoft公司的HFSS13电磁仿真软件,对天线进行了仿真及优化,天线尺寸为39mm×29mm×1.7mm,该天线在多个频率点上谐振。仿真结果表明,该天线参数S11≦-10 dB,天线和馈线匹配的很好,覆盖了LTE2300,LTE2500和WLAN的2.4/5.2/5.8 GHZ及WiMAX的2.5/5.5 GHz的工作频段,适于目前的超薄智能手机。     

A narrow-frame antenna for WWAN/LTE/WiMAX/WLAN mobile phones

In this paper, we present a novel narrow-frame antenna with a size of 75 × 8 × 5.8 mm³ for 5.7 in. mobile phones. The antenna mainly consists of a monopole with four branches that are coupled to a two-branch grounded strip. Our antenna is able to cover more bands than other narrow-frame antennas by excitation of several resonant modes. The improved range of the antenna covers the following eleven bands: LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, LTE2500, LTE3400 (3400–3800 MHz)/WiMAX3.5 GHz (3400–3650 MHz), WLAN5.2 GHz (5150–5350 MHz) and WLAN5.8 GHz (5725–5875 MHz). Another advantage of the proposed antenna is that it does not need any lumped element to match the antenna. The working principles of the proposed antenna are thoroughly studied. A prototype of the proposed antenna is fabricated and measured, with the results in good agreement with the simulation results.     

Narrow and wide band monopole antenna design using heterogeneous bidirectional recurrent neural network for LTE and UWB applications

The proposed antenna is a small wideband monopole with wideband circular polarization using heterogeneous bidirectional recurrent neural network for both narrow and wide band applications (NWB-MAD-HBRNN). The electromagnetic structure is designed, fabricated, and simulated with 1 mm thickness on FR4 substrate material along dielectric constant 4.3. The proposed antenna includes 4.3–8.85 GHz for ultrawideband applications; it contains reconfigurable narrow band for L-band 1.27 GHz, LTE, and ultrawideband applications. To enhance the antenna impedance bandwidth (BW) along axial ratio bandwidth (ARBW), a slit is etched at the antenna patch, a rectangular stub is inserted into the ground plane, and semicircular stub is added to the top of antenna feed line. The better agreement is observed in the measured and simulated gain performance of 4.8 dB for LTE band applications. The proposed NWB-MAD-HBRNN design provides 13.50%, 18.91%, and 22.58% higher bandwidth and 18.36%, 20.38%, and 27.58% lower return loss than the existing designs, such as bio-inspired wideband antenna for wireless applications based on perturbation technique (BWA-WA-PA), a compact circularly polarized modified printed monopole antenna for wireless applications (CCP-MPMA-WA), and new multiband monopole antenna for certain broadband wireless applications along wireless personal communications (PA-MMA-BWA), respectively.     

高频地波雷达交叉环/单极子天线幅度相位校准

针对小口径高频地波海态监测雷达广泛采用的交叉环/单极子天线阵列,理论分析了接收通道幅度和相位误差对其到达角估计精度的影响.由于常规线性拟合估计增益误差的方法常常失效,为此提出了更实用的校正方法:在单极子上预选出大信噪比谱点作为候选校正谱点,再根据天线共相位中心约束条件作进一步筛选,由单极子和交叉环上各谱点的互协方差估计出相位误差,并由归一化谱功率比估计出幅度误差.该方法在便携式高频地波雷达OSMAR-S中运行良好.现场比测实验结果证明了该方法的有效性.     

改进的圆形单极子超宽带天线

为了有效地对圆形单极子超宽带天线进行小型化,在圆形贴片上进行切边和加圆处理,设计了一款尺寸为30 mm×31 mm的改进型圆形单极子天线。该天线印刷在相对介电常数为4.4、厚度为1.6 mm的FR4介质板上,通过改变切边圆和所加圆的尺寸对天线进行优化。实验结果表明,该天线在S11≤–10 d B的工作带宽为3.03~11.55GHz,相对带宽为116.9%。该天线减小了传统圆形单极子天线的尺寸,可应用于超宽带通信系统中。     

一种应用于WLAN/WiMAX的新颖的三分枝单极天线

提出了一种应用于WLAN/WiMAX的新颖的多分枝单极天线,天线有三个分枝,结构紧凑,其大小为26mm×24mm×1.6mm,加工出了天线并进行测试,测试结果表明天线具有良好的双波段工作特性,｜S11｜≤-10dB时对应中心频率2.47GHz和4.825GHz处带宽分别达4%和62.4%,覆盖WLAN的2.4/5.2/5.8GHz频段及WiMAX的3.5/5.5GHz频段,同时采用了接地板开槽技术以调整带宽,天线在上述频段有近似于全向辐射方向图。     

A novel broadband circularly polarised monopole antenna

A novel broadband circularly polarised (CP) monopole antenna is designed and implemented in this article. The antenna consists of a radiating patch that is composed of an annular-ring linked by a square ring over the corner and a modified ground plane. The broadband property is achieved based on a novel monopole structure that is connected by two perturbed loops, so the CP wave is generated due to the perturbation. Besides, by cutting a rectangular slit and embedding a vertical stub on the ground plane, the impedance and axial-ratio (AR) bandwidths can be greatly enhanced. The measured results reveal that the proposed monopole antenna has an impedance bandwidth of 4.575 GHz from 2.3 to 6.85 GHz, reaching the particularly broad bandwidth of 99.5%. Furthermore, a wide 3-dB AR bandwidth of 34.6% (1.53 GHz, 3.65–5.18 GHz) centred at 4.42 GHz is achieved. The radiation characteristics of the designed antenna are also presented.     

共面波导馈电的频率可重构印刷单极子天线

提出了一种间接改变天线辐射体长度的方法。该方法通过改变天线馈线中地导体的长度,间接地改变天线辐射体的长度,有效避免了有源开关对天线辐射性能的影响。为验证此方法,设计了一个共面波导馈电的频率可重构印刷单极子天线,该天线利用PIN二极管来改变馈电端地的长度。实验结果表明:控制开关的工作状态,可使天线的谐振频率发生明显的变化。相应的中心频率分别为1.9 GHz和2.3 GHz,相对阻抗带宽分别为20.8%和17.2%。     

一种小型化超短波单极子天线设计

超短波天线在舰船飞机上应用很广,天线的小型化有利于提升其隐蔽性、稳固性,因此对天线的小型化设计显得异常重要。采用加载集总元件和宽带匹配网络的方式,设计了一款新型超短波天线。将宽带匹配网络做成一个微带电路结构与天线辐射单元直接相连的一体化设计,进一步减小了天线的长度;采用 Matlab 和 HFSS 软件联合仿真,并运用遗传算法优化计算全部集总元件的具体数值。天线在100 MHz~400 MHz频段范围内的驻波系数 VSWR(电压驻波比)小于3,水平方向全向辐射。天线和匹配网络总的物理长度仅为255 mm,实现了小型化的要求。制作了天线实物并测量,实测天线参数与仿真参数吻合较好,达到了设计目标。     

Compact CPW-Fed ultrawideband MIMO antenna using hexagonal ring monopole antenna elements

In this paper, a compact coplanar waveguide (CPW) fed ultra-wide band (UWB) multi input multi output (MIMO) antenna is proposed. The antenna consists of two antiparallel hexagonal ring monopole elements. Circular arcs shaped grounded stubs are used to enhance the isolation, both the arcs are connected through stub to make common ground. Tapering of the slots of CPW feed line at feed point, and grounded slots are introduced for impedance matching over UWB. The proposed antenna is fabricated and impedance bandwidth, isolation, radiation pattern, and gain are measured. Moreover, envelop correlation coefficient (ECC) results are given. Proposed antenna structure operates in the frequency range 3–12 GHz with a fractional bandwidth of 120% keeping isolation better than 15 dB. The antenna has a compact size of 45 × 25 mm².     

一种应用于WLAN的抗金属四频段平面单极天线设计

用于非金属外壳设备的常规天线与金属外壳设备一起使用,会导致完全不同的回波损耗。因此,提出了一种同时适用于金属外壳和非金属外壳设备的四频段平面单极天线,该天线由一个弯曲接地层、一对寄生贴片和由同轴馈电激发的辐射片组成。提出的天线能够在不同类型接地层影响下,保持其谐振频率一致性,甚至能够连接到金属外壳上。该天线适用于在WLAN 2.4/5.2/5.8 GHz、WiMAX 3.5/5.5 GHz和4.5GHz工作的多种应用。仿真和实际测量结果显示,即便是连接到较大的金属外壳或金属板时,提出天线能够较好地保持回波损耗和增益一致性且符合行业标准。     

一种新型超宽带双陷波平面单极子贴片天线设计

设计一种新型双陷波超宽带单极子贴片天线,辐射贴片为酒杯型天线结构,采用对底部边缘开槽曲流的办法,实现了良好超宽带天线性能。同时对辐射贴片加载了U形和C形缝隙,分别在3.5 GHz和5.5 GHz处产生陷波。利用HFSS软件对所设计天线进行仿真验证,仿真结果与实测结果表明,该天线在超宽带范围内能有效抑制双陷波能力,并且在通带范围有良好辐射和稳定增益特性。其天线尺寸为33 mm×26 mm×0.74 mm,便于集成在电路系统中。     

一种新型超宽带双陷波平面单极子贴片天线设计

设计一种新型双陷波超宽带单极子贴片天线,辐射贴片为酒杯型天线结构,采用对底部边缘开槽曲流的办法,实现了良好超宽带天线性能。同时对辐射贴片加载了U形和C形缝隙,分别在3.5 GHz和5.5 GHz处产生陷波。利用HFSS软件对所设计天线进行仿真验证,仿真结果与实测结果表明,该天线在超宽带范围内能有效抑制双陷波能力,并且在通带范围有良好辐射和稳定增益特性。其天线尺寸为33 mmX26 mmX0.74 mm,便于集成在电路系统中。     

Integrated amateur band and ultra-wide band monopole antenna with multiple band-notched

This paper presents the integrated amateur band and ultra-wide band (UWB) monopole antenna with integrated multiple band–notched characteristics. It is designed for avoiding the potential interference of frequencies 3.99 GHz (3.83 GHz–4.34 GHz), 4.86 GHz (4.48 GHz–5.63 GHz), 7.20 GHz (6.10 GHz–7.55 GHz) and 8.0 GHz (7.62 GHz–8.47 GHz) with VSWR 4.9, 11.5, 6.4 and 5.3, respectively. Equivalent parallel resonant circuits have been presented for each band-notched frequencies of the antenna. Antenna operates in amateur band 1.2 GHz (1.05 GHz–1.3 GHz) and UWB band from 3.2 GHz–13.9 GHz. Different substrates are used to verify the working of the proposed antenna. Integrated GSM band from 0.6 GHz to 1.8 GHz can also be achieved by changing the radius of the radiating patch. Antenna gain varied from 1.4 dBi to 9.8 dBi. Measured results are presented to validate the antenna performances.     

单极子-交叉环天线阵波束形成的分析

为了提高便携式近程海态测量与分析高频地波雷达（OSMARS）的风、浪探测能力,以单极子-交叉环组合天线为基本单元构建小型均匀直线阵列.分析了阵元间距对波束形成的影响,讨论了低副瓣处理对波束栅瓣的作用.结果表明：单极子交叉环天线阵波束的栅瓣幅度要比主瓣幅度小,且低副瓣处理能够将栅瓣完全压制.通过对不同阵元间距下的单极子交叉环天线阵的波束指向性能的比较,证实了可以适当地增加阵元间距,突破雷达半波长的严格要求,在获取相同的均匀旁瓣电平条件下以得到更窄的主瓣宽度.