共查询到18条相似文献,搜索用时 171 毫秒
1.
介绍了中国计量科学研究院(NIM)开发的一套精密球面近场扫描法天线校准装置(400 MHz~110 GHz)在测量天线归一化方向图(限于幅度)时的不确定度评定。以“自我比较法”为基础,简介了探头、安装对准、数据采样和射频系统等引入的18个不确定度分量的评定结果,重点针对天线暗室反射引入的不确定度不易评估的难题,基于射线追踪法提出了一种分析、测量和计算相结合的“干扰法”。评估结果表明该套近场系统在-40 dB副瓣电平内,重复性优于0.1 dB (26 GHz)、在忽略探头极化误差时的扩展不确定度优于2.7 dB。最后分析了球面近场天线测量的不确定度特点。 相似文献
2.
本文讨论了基于线分量幅度的圆极化天线测试方法,介绍了这种方法测试轴比的原理,首次指出了这种方法不能判定主极化旋向的问题,并提出了采用两个一般性能的圆极化参考天线来判定旋向的修正方案.此外针对实际测试中的特殊情况进行了修正完善.最后实际测量了自行设计的双频双圆极化天线阵列,测试与仿真结果保持了良好的一致性,从而表明了该修正的正确性、有效性与实用性. 相似文献
3.
给出一种应用于无线通信的极化分集天线.该天线结构简单紧凑,由两个方向垂直的T形天线单元实现线性极化分集.通过在接地板上开L形的槽,实现了天线的小型化,同时提高了两个端口的隔离度.仿真和测量结果表明,所实现的天线工作在2.4 GHz,在两个端口上,回波损耗小于-10 dB的带宽大于30%,两端口隔离度基本在-20 dB以下.测量结果与仿真结果基本吻合. 相似文献
4.
《真空科学与技术学报》2020,(7)
设计了一套回旋振荡器高阶体模开放式谐振腔自动扫描测试装置。该装置通过计算机程序控制,采用BJ1400标准矩形波导作为天线检测辐射场,扫描精度可达0.05 mm,具有100 dB的动态范围。以140 GHz的TE_(28,8)高阶体模谐振腔场分布检测为例,当扫描步长在水平方向和垂直方向分别取0.5 mm和0.3 mm时,y方向电场波峰和波谷的检测数据相差约10 dB。 相似文献
5.
设计一种工作在C波段(5.15-5.825GHz)的新型的双线极化高隔离度微带振子天线,主要应用于短距离的移动通信。天线单元采用双"H"缝隙地板、合理的振子排列方式及微带线馈电方式,通过HFSS软件的优化仿真,得到很好的结果,并组成2×2面阵,在整个频段内驻波比小于2,隔离度大于30dB,在中心频率5.54GHz时,E面最大辐射方向的增益为8.9dB;H面最大辐射方向的增益为11.2dB。该天线体积小,有利于小型化和集成化。 相似文献
6.
针对Ka频段卫星通信系统的需求,设计了一种应用于卫星通信的星载Ka频段圆极化振子天线阵列.天线单元采用非对称双臂振子单元形式,十字交叉振子采用自相移结构来实现圆极化.天线阵列采用三角形排布的方式,通过调整布阵时天线单元旋转相位,来实现阵列的右旋圆极化.仿真结果表明:天线阵列驻波比除阵面四周由于边缘效应引起的驻波比偏大外,其余都小于1.5;天线阵列的轴比小于2.3 dB;扫描60°时,天线增益下降小于5 dB,表明天线阵列具有较高辐射功率.该天线阵列可作为相控阵天线的馈源,在卫星通信系统具有良好的应用前景. 相似文献
7.
设计了一种P波段宽频带高隔离度双极化柔性微带天线的。天线各层均采用柔性薄膜材料制作,相邻层间为空气层,因此天线整体为柔性可折叠展开。仿真结果表明,该天线单元的阻抗带宽大于30%,极化端口隔离度大于42dB。 相似文献
8.
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
9.
10.
郝刚刘宇峰陈新伟韩国瑞 《测试技术学报》2021,35(6):544-548
本文设计了一款新型微带栅格阵列天线.为了拓展天线带宽,辐射单元采用非均匀尺寸的菱形结构,在介质基板与地板间加入空气层,采用探入式同轴探针对天线进行馈电.单元间微带传输线采用正弦曲线结构,极大地减小了天线的辐射口径.天线面积为290×205 mm^(2),共包含7个菱形辐射单元.通过建模仿真和扫参分析,结果表明,天线的阻抗带宽(|S_(11)|<-10 dB)为13.0%(2.30 GHz~2.62 GHz).在工作频率2.45 GHz处,天线的最大增益达到15.4 dBi,交叉极化小于-25 dB,旁瓣电平低于-15.6 dB. 相似文献
11.
提出一种应用于Wi-Fi/WiMAX的宽带高增益双极化阵列天线.它由+45°和-45°正交极化的两个天线组成。当频率为2.38~2.72 GHz时,天线的回波损耗大于-10 dB;端口1与端口2之间隔离度大于20 dB;端口1在2.45 GHz时获得最大增益为17.14 dBi,端口2在2.483 GHz时获得最大增益为17.15 dBi.仿真和测试很好相吻合,该双极化天线能满足Wi-Fi/WiMAX通信网络要求. 相似文献
12.
A wideband circularly polarised slot antenna is presented. The slot antenna is fed by four microstrip line feeds orientated to have relative phases of 0deg, 90deg, 180deg and 270deg using a feed network comprising a pair of broadband 90deg hybrid. The proposed antenna delivers measured and simulated impedance bandwidths of 77.8% (1.02-2.32 GHz) and 89.1% (1.02-2.66 GHz), respectively, for standing wave ratio (SWR) < 2, measured and simulated axial-ratio bandwidths of 88.9% (1-2.6 GHz) and 81% (1.1-2.6 GHz), respectively, for axial ratio < 3 dB and measured and simulated gain bandwidths of 33% (1.5-2.1 GHz) and 27% (1.6-2.1 GHz), respectively, for gain >3 dB. A good agreement is observed between simulation and measurement. 相似文献
13.
14.
Compact Interlaced Dual Circularly Polarized Sequentially Rotated Dielectric-Resonator Antenna Array
Yazeed Qasaymeh 《计算机、材料和连续体(英文)》2022,72(3):4631-4643
In this study, a compact 2 × 2 interlaced sequentially rotated dual-polarized dielectric-resonator antenna array is proposed for 5.8 GHz applications. The array is composed of a novel unit elements that are made of rectangular dielectric resonator (RDR) coupled to an eye slot for generating the orthogonal modes, and to acquire circular polarization (CP) radiation. For the purpose of miniaturization and achieving dual polarized resonance, the array is fed by two interlaced ports and each port excites two radiating elements. The first port feeds horizontal elements to obtain left hand circular polarization (LHCP). The second port feeds vertical elements to obtain right hand circular polarization (RHCP). A quarter-wave length transformer is employed to reduce the attenuation and consequently increase the array gain performance. The 35 × 35 mm2 () gains were 8.4 and 8.2 dBi for port 1 and port 2, respectively, with port isolations of −33.51 dB. The design achieves a voltage standing-wave ratio (VSWR) < −10 dB and an axial ratio (AR) ˂ − 3 dB bandwidth of 2.48% (5.766 to 5.911 GHz) for LHCP at port 1 and a VSWR < −10 dB and AR ˂ −3 dB bandwidth of 2.28% (5.788 to 5.922 GHz) for RHCP at port 2. The findings of the proposed design validate its use for ISM band applications. 相似文献
15.
16.
Abstract The experimental and simulated results for the proposed antenna are investigated in this article. Moreover, a novel broadband design of a circularly polarized (CP) single square slot antenna fed by a single coplanar waveguide is presented. By appropriately choosing the circumference of the square‐loop, the length of the protruded strip, and the gap, this proposed antenna thus owns good CP radiation and good impedance match simultaneously at the frequency of 2.45 GHz. This proposed antenna has the fundamental resonant frequency of 2.5 GHz with the minimum return loss of ‐39.9 dB. Furthermore, its impedance bandwidth is 460 MHz or 18.4% and 3‐dB axial‐ratio (AR) bandwidth is 360 MHz or 14.4% at 2.5 GHz. 相似文献
17.
18.
The authors present the performance of a patch fed planar dielectric slab waveguide extended hemi- elliptical lens antenna. The lens is constructed using polystyrene and weighs only 90 g. The maximum lens dimensions are 11 lambda times 13 lambda in the lens plane and it is 0.6 lambda thick. From 18 to 30 GHz the lens can handle both TM0 and TE0 signals simultaneously and at 22 GHz it can be made to generate a 1.5 dB axial ratio circularly polarised signal when fed by a linearly polarised patch antenna orientated to 38deg with respect to the horizontal. The measured gain and half-power beamwidth for TM0 and TE0 excitation at 28.5 GHz are 18.5 dB (aperture efficiency of 85%), 4.1deg and 18.7 dB, 4.4deg, respectively, both with a -10 dB return loss bandwidth of about 10%. 相似文献