基于北斗卫星导航系统的一种圆极化微带天线

介绍一种用于北斗卫星导航系统的圆极化微带天线。该天线的主辐射器由开槽的圆形贴片构成,采用单点的同轴馈电,设计的中心工作频率为2．492GHz。仿真结果显示,调节圆形贴片中开槽的长度,可以分离出简并模,激励两个正交的模式,当两个分量相位为90deg,可以实现圆极化。实际测试中,｜S11｜于-10dB的阻抗带宽为0．09GHz,3dB轴比带宽为0．033GHz,与仿真结果基本吻合。     

如何调整卫星接收天线接收卫星信号

调整卫星天线接收卫星信号让人觉得是个很复杂的工作,难掌握,看到有人在调整卫星接收天线便想看个究竟,但是看过之后还是一头雾水。其实接收卫星信号并没有想象中的复杂,它非常简单,也很容易掌握。下面就介绍一下如何从实际角度出发来调整卫星接收天线,达到较好的信号接收效果。     

一种卫星接收天线的研究

介绍了一种宽带宽、轴比带宽宽的卫星接收天线的设计,天线采用微带线共面馈电的微带天线形式,利用增加寄生贴片展宽天线单元的电压驻波比带宽和圆极化轴比带宽,利用旋转馈电技术扩展了天线阵列的圆极化轴比带宽.天线设计得到了实验的验证.     

单面卫星天线接收多颗卫星信号方案

单面卫星天线接收多颗卫星信号方案鹤壁市广播电视局孙贤明目前使用的卫星接收天线一般是一天线接收一卫星信号，如果能实现一接收天线接收多颗卫星信号，则将节省不少资金，减少占地面积。所以，一接收天线收多颗卫星信号有其经济价值和现实意义。尽管目前有几种利用一面...     

馈源漏雨引起接收不到卫星信号防止一法

采用后馈天线进行卫星接收，如果在一场雨水过后出现所有的频道均接收不到节目，监视器里只有一片噪波、噪声的现象，而此时接收机上信号强度指示仅比正常时的稍小，一般都是因为雨水漏进了馈源，最后沉积于高频头上波导同轴转换器的槽里所致。     

哈尔滨地区可接收的卫星及相应的接收天线的口径

北方的一些初级发烧友由于不知道自己收视的卫星用多大的天线,常使自己安的天线收不到信号或没有空间安装。笔者特将在哈尔滨收视的热星和需要天线口径列一表共发烧友参考。★68.5°E泛美7/10号:C:2.4m★76.5°E亚太2R:C:1.8m、Ku:0.9m★78.5°E泰国卫星3号(现为5号):C:1.8-3.5     

一种用于北斗卫星导航系统监测站的故障监测与诊断设计

监测站是北斗卫星导航系统（BDS）地面监控部分的重要组成之一,设备类型和数量众多,在长期运行过程中,随着运行时间累积、设备老化,各种设备出现故障不可避免。为了保障BDS整体长期稳定运行,必须最大限度减少监测站因设备故障造成的运行中断时间,这对于设备故障的快速检测和定位就显得尤为重要。基于此,设计了一种用于北斗卫星导航系统监测站的故障监测与诊断方法,从设备故障的自动监测和智能诊断两个层次来进行故障处理,能够快速检测和定位出故障设备和原因,及时更换故障设备或模块,使监测站尽快恢复正常运行。     

多卫星接收天线原理及设计

本结合实际工程背景,讨论了基于修正双曲面抛物面的单站多卫星地面接收天线的原理与设计,并给出了计算机辅助设计的实现方案。     

频谱分析仪在卫星接收中的应用

本文作者从业内实践出发,通过详细介绍频谱分析仪的工作原理,提出了频谱分析仪在卫星地面接收中的五项基本应用:观察某个极化上的所有信号、某个转发器上的信号状况、高频头(LNB)本振的准确度,调准天线的指向和极化倾角、以及分析LNA和LNB的性能。     

双频双圆极化北斗天线的设计

设计了一种的小型化的双频双圆极化微带天线。对两个工作于主模的正方形贴片,通过采用对角切角方法,在北斗卫星导航系统的S频段实现右圆极化。通过蚀刻不对称臂U型槽结构,在北斗卫星导航系统的L频段实现左圆极化与小型化。其相比对普通的圆极化天线尺寸减小了24%,使用HFSS进行仿真,仿真结果表明本天线可以达到北斗系统对天线的各项指标要求。     

一种获取北斗卫星信号新方法的研究

北斗导航卫星系统作为兼容、独立、开放和全球的导航系统,被设计用于执行导航和控制任务。该系统在现实环境中的成功运行必须克服众多挑战,其中主要是提高北斗卫星信号的捕获成功率。旨在减轻调制码处理方式带来的混叠伪像,提高北斗定位接收机定位性能,提高捕获成功率,文中提出了一种使用信号平方的捕获卫星信号的方法。实验结果表明,相对于传统方法,该方法具有更好的北斗信号捕获性能。     

The performance of antenna amplifiers used for terrestrial DTV reception

Measurements were made on currently available commercial antenna-mounted amplifiers to ascertain their effects on DTV reception. Data regarding amplifier gain and noise figure is presented, followed by data illustrating the effects of intermodulation within the tested amplifiers as shown by the change in the D/U interference ratio of a control DTV receiver, and ending with observations regarding amplifier environmental sensitivity. Also presented are the inconsistencies between the performance of commercially available amplifiers, advertised to the public for use with television, and the performance claims made by the manufacturers of such amplifiers.     

Compact varactor-tuned meander line monopole antenna for DVB-H signal reception

A compact varactor-tuned meander line monopole antenna for DVB-H signal reception is presented. The operating frequency of the antenna is continuously tuned over the frequency range of the DVB-H standard 470-702 MHz. The antenna has an omnidirectional radiation pattern and covers the frequency range with requisite impedance bandwidth and gain level. The antenna element occupies a very small volume (0.7 cm³ ) and can be used in 40 x 100 x 10 mm devices.     

The development of radial line slot array antenna for direct broadcast satellite reception

Microwave antennas are extensively used in communications systems such as satellite, television and high-speed data transmission due to their wide and absolute bandwidth. Among the variety of microwave antennas, satellite communication commonly adopts an antenna of parabolic dish type, despite some drawbacks. In a primary fed design, there is considerable aperture blockage. An offset parabolic antenna design, which then eliminates the blockage, is susceptible to physical damage as its feed is significantly exposed from the body of reflector. The radial line slot array (RLSA) type antenna is thus designed to cope with the problems encountered in parabolic antennas. RLSA is a planar antenna suitable for direct broadcast satellite (DBS) reception, with advantages including high radiation efficiency (high gain), low profile, low cost and feed rear-mounted. The prototype development started with the selection of the cavity's dielectric material and construction of the feeding structure of coaxial-to-waveguide transition. Within the frequency band of interest, between 10.95 and 11.7?GHz, results, is showed a lower than ?10?dB of return loss. A DBS receiver test-bed had been developed to test the constructed antenna prototypes and it revealed that the prototype has the capability of receiving TV programs from DBS.     

适用于物联网多频段通信的矩形微带天线设计

为满足主流物联网通信技术的应用需求,提出一种新型的矩形微带单极天线,适用于多频段通信,如射频识别、全球定位系统和无线局域网等。该矩形微带天线由一个带两个U形槽的矩形贴片和一个带两个长方形槽的接地面组成,具有四个工作频段,当谐振频率分别为1.22GHz, 2.47GHz, 3.61GHz和5.60 GHz时,相对带宽为25.7%（1.12~1.45 GHz）、25.3%（2.24~2.89 GHz）、15.7%（3.40~3.98 GHz）以及13.6%（5.21~5.97GHz）。仿真与实测结果显示,该天线的工作频段数量更多且相对带宽更高,在各工作频段内具有良好的全向辐射特性。     

一种 K 频段宽带双极化滤波喇叭天线设计

提出了一种新型结构Ku波段矩形滤波波导缝隙阵列天线的设计方法,该阵列天线的滤波特性由嵌入在矩形波导中的“之”形金属杆实现. 通过分析“之”形矩形波导滤波结构的等效电路和带阻滤波特性,设计了一个滤波波导缝隙阵列天线. 实测结果表明,该滤波波导缝隙阵列天线–15 dB阻抗带宽约为6.8%（12.06～12.91 GHz）,覆盖Ku波段卫星通信的下行频段（12.25～12.75 GHz）,带内增益为13.5～14.4 dBi,交叉极化电平低于–38 dB,且在Ku波段卫星通信的上行频段（14.0～14.5 GHz）具有超过29.8 dB的带外抑制.     

Low-cost approach for steerable flat-plate antenna design withapplication to reception of broadcasting from satellite

A novel design approach for circularly polarised flat-plate antennas has been developed. The proposed antenna is of multilayer construction, rotatable about its normal axis, and comprises a polarisation convertor, an array of elements and a beamforming network. In one potentially large application, the reception of satellite broadcast signals in the 12 GHz band, it can be mounted flat on the most suitable wall of an arbitrarily orientated house and be readily aligned     

Planar antennas for satellite reception

Direct broadcast satellite (DBS) reception requires a circularly polarized antenna with high gain and low axial ratio. Recently, various types of planar antennas have been studied and developed for DBS reception in the 12-GHz band. A summary is presented of properties and classification of planar antennas both commercialized and reported. The basic configurations, working principles, and performance of various planar antennas are described     

用于北斗终端系统介质埋藏天线的设计

传统的微带贴片天线中的辐射贴片振子都采用矩形(方形)、圆形、三角形、Y形等形状,一般使用单馈法加入微扰激励圆极化波,这里描述的立体式介质埋藏微带贴片八木天线中的辐射贴片振子不同于传统的形状,采用了梅花形辐射贴片振子,并在辐射贴片上开矩形槽,用单点馈电激励圆极化波。仿真结果表明在北斗射频信号S(2.491GHz±10.23MHz)的中心频率上,该天线的最大增益为8.72dB;将梅花形贴片改变成花瓣形贴片后的仿真天线增益增大到8.82dB,轴比带宽和S11阻抗带宽变宽,为实物天线的制作提供了依据。     

一种高介GPS微带天线的设计与研究

针对传统GPS天线体积较大的问题,提出了一种改进的圆极化微带贴片天线,该天线用高介电常数的陶瓷作为天线基板,采用单端口背馈方式馈电,缩小了天线尺寸,结构简单。通过仿真优化,获得了比较好的阻抗带宽和轴比带宽,并以此为基础研究了介质基板厚度及损耗对天线性能的影响,为GPS微带天线设计提供一种思路。