欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    ITU-R QUESTION 42-14-1993 Characteristics of antennas at earth stations in the fixed-satellite service《固定卫星业务中地球站天线特性》.pdf

    • 资源ID:792538       资源大小:13.43KB       
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    ITU-R QUESTION 42-14-1993 Characteristics of antennas at earth stations in the fixed-satellite service《固定卫星业务中地球站天线特性》.pdf

    1、QUESTION ITU-R 42-1/4 Characteristics of antennas at earth stations in the fixed-satellite service (1990-1993) The ITU Radiocommunication Assembly, considering a) that the radiation fields close to antennas will affect the level of coupling between earth-station antennas in the fixed-satellite servi

    2、ce (FSS) and nearby antennas using the same frequency bands; b) that the radiation fields of antennas may also be affected by the use of pit shielding; c) that earth-station antennas with more than one beam are feasible, and that the use of such antennas may be preferable to employing several single

    3、-beam antennas at an earth station; d) that frequency re-use might be achieved with orthogonally polarized signals; e) that the precision of satellite station-keeping and attitude control may improve as a result of the development of more advanced control techniques in the satellite sub-systems; f)

    4、that at higher frequency bands (i.e. 20-30 GHz) phased array antennas are also likely to be used, decides that the following Question should be studied 1 What is the relationship between near and far field patterns of earth stations in the FSS and other stations using the same frequency bands? 2 Wha

    5、t is the coupling between antennas close to one another? 3 What is the effectiveness of pits or other devices for providing shieldings? 4 What are the radiation characteristics of each beam of multi-beam antennas? 5 What are the limitations on the number of beams that can be generated by a single an

    6、tenna, and what is the minimum achievable angular separation between the beams? 6 What is the polarization discrimination performance of antenna systems in all angular regions with particular regard to the antenna type? 7 What are the desirable limits of steerability of earth-station antennas for geostationary satellites? 8 What are the radiation characteristics of phased array antennas? further decides 1 that the results of these studies should lead to the formulation of appropriate Recommendations by 2006. NOTE 1 See Recommendation ITU-R S.736.


    注意事项

    本文(ITU-R QUESTION 42-14-1993 Characteristics of antennas at earth stations in the fixed-satellite service《固定卫星业务中地球站天线特性》.pdf)为本站会员(eastlab115)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开