超宽频带小尺寸对数周期偶极子天线设计分析

文章研究了超宽频带对数周期偶极子天线(LPDA)的结构,对15～110MHz超宽频带对数周期偶极子天线的尺寸参数进行了设计,根据设计分析,对于超短波波段超宽频带对数周期偶极子存在的天线纵向尺寸较大的问题对该天线纵向尺寸进行了设计创新,从而使天线在包括工作带宽、增益、方向图等电特性参数不变差的前提下使纵向尺寸设计值从29...     

一种新型宽频带折合平面单极子手机天线的设计与分析

本文设计了一种新型微带馈电的折合平面单极子手机天线，采用时域有限差分法（FDTD）计算并分析了新型折合平面单极子天线几何参数对其性能的影响．实际测试发现，FDTD方法分析所得结果与实验结果基本一致,该天线具有结构简单、宽频带、馈电方便、便于集成等特点，为第三代移动通信手机天线增加了一种新选择.     

适用于WPAN/WLAN的一种新型双频IFA印制天线

首先对单频IFA印制天线的各项主要尺寸参数进行研究，并给出其对天线阻抗性能及谐振频率的影响结果；然后在此基础上设计出可工作于2．45GHz和5．25GHz的原型双频IFA天线，并提出天线的新型结构——改进型双频IFA天线，给出其相应的仿真与测量结果。该新型天线可直接印制到FR-4板材上，结构紧凑，价格低廉，馈电方便，设计简单、灵活，具有等向辐射和交叉极化特性，适用于前景广阔的WPAN和WLAN系统。     

一种宽频带共形天线的特性研究

设计了一种具有宽频带特性的柱面共形天线,通过改变柱体曲率半径、长度和介电常数等参数,详细分析了其变化对共形天线性能的影响。结果表明:柱体各个参数的变化会导致天线的谐振频率、阻抗带宽以及辐射特性发生显著的改变。对设计宽频带共形天线时共形载体的选取提供了可靠依据。实际加工制作了天线,测量结果表明:该天线具有宽频带特性,可用频段覆盖2～16GHz,在工作频段内具有较好的辐射特性,增益稳定。     

一种超宽频带双圆锥全向天线的设计

介绍了一种可工作于0．8～16GHz的超宽带双圆锥全向天线的工作原理、设计参数及其对电性能的影响，给出了该天线工作于X波段的具体结构尺寸以及VSWR、辐射方向图的仿真和测试数据曲线，以及此天线在0.8～16GHz范围内的VSWR的测试数据曲线，并提出了一些设计此天线的关键点。结果表明，此天线具有频带宽、全向均匀性好、增益大、结构简单等优点，可广泛应用于高低功率的雷达、通讯中的全向天线。     

曲面EBG结构带隙特性的研究

利用光学B ragg反射条件,设计了一种曲面电磁带隙结构。采用悬置微带线法,分析了其结构参数以及圆柱结构参数对带隙特性的影响。结果表明,结构参数对表面波带隙影响的规律与平面上一致,圆柱曲率对表面波带隙的影响不是太大,只是带隙中心频率略有下降。这一结论对在曲面共形天线上应用电磁带隙结构提高天线性能有重要的指导意义。     

一种分齿蝶形超宽带天线的设计与研究

对一种分齿结构的蝶形平面天线进行了研究设计与验证。通过仿真将该结构天线与普通蝶形天线进行对比,分析了分齿比例参数对其性能产生的影响。结果表明,该类天线可以在保证特定频段驻波比性能的同时,减轻天线的重量。优化设计并制作了工作在300～480 MHz频段的一款天线,测量结果显示,在工作频率范围内,天线馈入端驻波比小于2,相对带宽大于40%,符合超宽带天线设计要求。     

PBG结构分析及其在柱面共形微带天线中的应用

利用光学Bragg反射条件,设计了两种曲面光子带隙结构,并将其应用于柱面共形微带贴片天线中,分析了光子带隙结构的结构参数对微带贴片天线性能的影响。计算仿真表明,利用合适的PBG结构可以增强微带贴片天线的前向增益,抑制高次谐波,减小旁瓣,减小表面波损耗。     

太赫兹开槽介质型菲涅尔天线设计

设计了一款工作在太赫兹频段的开槽介质型菲涅尔(Fresnel)透镜天线,该天线由馈电结构和透镜结构两部分组成。利用CST微波仿真软件,首先设计波纹喇叭馈电结构,其次基于波纹喇叭馈电结构设计开槽型菲涅尔透镜天线,分析全波周期、焦径比和子区等对天线性能的影响,通过横向和纵向对比,确定最佳天线参数。结果表明对天线性能影响从大到小分别为:焦径比、全波周期、子区。焦径比F/D=3、全波周期w=3、子区P=4为最佳天线参数,波纹喇叭馈电天线经过开槽介质型菲涅尔透镜天线聚焦后,天线的增益提升12.5 d B。     

一种新型的大带宽微带天线研究

本文对一种新颖的具有宽频带特性的微带天线进行了实验研究，给出了这种天线的设计方法和测试结果，同时探讨了各结构参数对天线性能的影响．测试结果表明，这种天线其驻波比小于２（ＶＳＷＲ≤２）的相对带宽可达到３３％。在整个频带内，不同频率点上其Ｈ面方向图的３ｄＢ波瓣宽度在５０°～７０°之间。     

Development of a Cavity-Backed Broadband Circularly Polarized Slot/Strip Loop Antenna With a Simple Feeding Structure

A cavity-backed loop antenna is developed for producing broadband circularly polarized (CP) radiation. The antenna configuration consists of a slot loop and a strip loop. The slot loop radiates a CP wave at a lower frequency while the strip loop produces CP radiation at a higher frequency. A combination of the two frequencies leads to a bandwidth enhancement. The slot/strip loop antenna is fed by a single straight microstrip line. It is demonstrated that the cavity-backed slot/strip loop antenna can achieve an axial ratio (les 3 dB) bandwidth of 19% with good impedance matching. The antenna configuration is described and the operating principles for broadband circular polarization and impedance matching are analyzed. The antenna performance is confirmed by experimental results.     

一种宽带宽波束移动终端卫星通信天线

提出一种实用型宽带宽波束移动终端卫星通信天线。该天线采用双臂渐变螺旋以及锥形反射板的结构提高了常规双臂螺旋天线的性能。结合HFSS 软件与理论分析进行了天线结构参数设计,并进行了仿真和实验。仿真结果与测试结果吻合良好。该天线采用左旋圆极化方式,中心工作频率为1. 6GHz,工作频带150MHz,波束宽度大于110毅,且天线结构简单、牢固、易于加工,适合于各类小型移动卫星通信终端,以及高纬度地区的卫星通信。     

Some results on broad-band microstrip antenna with low cross polarand high gain

Stacked square microstrip broadband antennas with low cross polarization and high gain are studied. The low cross polarization is mainly due to the location of excitation feeds on the diagonals of the square lower patch. These advantages are explained in comparison with the usual case in which the excitation is positioned along the median. The evolution of one of the principal antenna parameters is studied by the spectral domain approach. A stacked antenna is realized on a low-loss substrate, and experimental results are compared with theory. The good performance obtained, even for linear polarization, shows that this antenna can be used in many applications in telecommunications     

一种新型C波段宽带圆极化贴片天线的设计

采用电磁仿真计算软件HFSS设计并仿真了一种工作于C波段宽带圆极化微带贴片天线。天线采用双馈点对圆形微带贴片进行馈电,实现圆极化;选用两层聚四氟乙烯玻璃纤维板作为介质,通过底层馈电网络由探针穿过中间地板层对上层圆形贴片进行馈电,在探针周围用环形槽将探针与地板进行隔离,并增加了天线的谐振点,从而进一步扩展了天线频带。结果表明天线的相对带宽约为30％,并且E面、H面3dB轴比角度均大于90°。     

Broadband dual-frequency operation of circular patch antennas and arrays with a pair of L-shaped slots

By embedding properly arranged L-shaped slots in a circular patch, a novel broadband dual-frequency design is proposed and experimentally studied. With the use of an L-strip microstrip line for feeding the proposed antenna, the impedance bandwidths, determined from 10 dB return loss, of two operating bands can reach about 7.0% to 12.5% for the lower band and 18.9% to 21.5% for the higher band. Operating frequencies across the obtained lower and higher bands are of the same polarization planes, and have a tunable frequency ratio between the center frequencies of the two operating bands ranging from about 1.31-1.61. The application of the proposed antenna to the design of a 2 /spl times/ 2 broadband dual-frequency patch antenna array is also demonstrated. Details of the proposed broadband dual-frequency design are described, and experimental results of the constructed prototypes are presented and discussed.     

Broadband Stacked Patch Antenna with Low VSWR and Low Cross‐Polarization

A low cross‐polarization broadband stacked patch antenna is proposed. By means of the stacked patch configuration and probe‐fed strip feed technique, the VSWR 1.2:1 bandwidth of the patch antenna is enhanced to 22% from 804 MHz to 1,002 MHz, which outperforms the other available patch antennas (<10%). Furthermore, the antenna has a cross‐polarization level of less than ?20 dB and a gain level of about 9 dBi across the operating bandwidth. Simulation results are compared with the measurements, and a good agreement is observed.     

Printed Wide-Slot Antenna for Wideband Applications

The design and analysis of a novel printed wide-slot antenna, fed by a microstrip line, for wideband communication systems is presented. Detailed simulation and experimental investigations are conducted to understand its behavior and optimize for broadband operation. The designed antenna has a wide operating bandwidth of over 120% (2.8-11.4 GHz) for S11 <-10 dB. In addition to being small in size, the antenna exhibits stable far-field radiation characteristics in the entire operating bandwidth, relatively high gain, and low cross polarization. By properly choosing the suitable slot shape, selecting similar feed shape and tuning their dimensions, the design with very wide operating bandwidth, relatively small size and improved radiation pattern is obtained. A comprehensive parametric study has been carried out to understand the effects of various dimensional parameters and to optimize the performance of the designed antenna. Results show that the impedance matching of this kind of antenna is greatly affected by the feed-slot combination and feed gap width, with the slot shape being a main contributor of the radiation characteristics. The simulated and measured Results for return loss, far-field E and H-plane radiation patterns, and gain of designed antenna are presented and discussed.     

自适应极化宽带天线单元的研究

宽带自适应极化天线在卫星通信和电子对抗领域,逐渐被广泛的应用。本文基于自适应极化天线的原理和方案的选择原则,研究了一种新型宽带组合式双线极化天线的辐射特性,分析了其极化特性,给出了设计方案和方法。     

基于极化转换超表面的低RCS对称振子天线设计

本文基于极化转换超表面加载技术提出了一种具有宽带雷达散射截面(Radar Cross Section, RCS)减缩特性的对称振子天线。用极化转换超表面代替传统对称振子天线的金属反射板， 在不影响天线辐射性能的前提下，实现了天线的带外 RCS 减缩。以对称振子天线为例进行了仿真研究，当电磁波分别以 x 极化和 y 极化方式垂直入射时，相对于传统对称振子天线，加载极化转换超表面的天线可在 5~18GHz 频段内实现不同程度地单站 RCS 减缩，其中 5dB 以上单站 RCS 减缩带宽分别为 6.3~14.5GHz 和 5.9~14GHz。仿真结果表明加载极化转换超表面的天线在保证辐射性能基本不变的情况下，可以实现良好的带外 RCS 减缩性能。     

Ka频段卫通相控阵封装天线设计与实现

针对卫星通信对终端天线低剖面、低功耗、极化可变及发射控制等需求,采用平板相控阵架构、极化可变阵列、稀疏布阵等技术,研制了一台基于单板集成封装技术的Ka频段卫星通信相控阵天线。该天线满足高轨同步卫星宽带应用需求和适航符合性验证试验DO-160G要求,经长时间跑车和飞行试验,其性能优良,可靠性高。