搜搜考试网英语翻译Development of small antennas for mobile phones has rece
来源：学生作业帮 编辑：搜搜考试网作业帮 分类：英语作业 时间：2024/08/11 17:57:35
英语翻译
Development of small antennas for mobile phones has received a lot of attention during the last few years due to sizereduction of the handsets,requirements to keep the amount of RF power absorbed by the user below standardized levelsregardless of the handset size,and introduction of multimode phones.Single-band and dual-band phones in which theexternal whip or helix antenna has been replaced by an internal shorted patch antenna (or PIFA) are already in themarket.It may be assumed that in the future there will also be a need for internal antennas which operate in severalcommunication systems.In this paper,a multiresonant dual-band internal handset antenna is introduced.The antenna isbased on the dual-resonant antenna structure reported in [1].To our knowledge,this is the first internal handset antennawhich covers the E-GSM900 (880 MHz - 960 MHz),GSM1800 (1710 MHz - 1880 MHz),DECT (1880 MHz - 1900MHz),PCS1900 (1850 MHz - 1990 MHz),and UMTS (1900 MHz - 2170 MHz) frequencies with a return loss Lretn
Development of small antennas for mobile phones has received a lot of attention during the last few years due to sizereduction of the handsets,requirements to keep the amount of RF power absorbed by the user below standardized levelsregardless of the handset size,and introduction of multimode phones.Single-band and dual-band phones in which theexternal whip or helix antenna has been replaced by an internal shorted patch antenna (or PIFA) are already in themarket.It may be assumed that in the future there will also be a need for internal antennas which operate in severalcommunication systems.In this paper,a multiresonant dual-band internal handset antenna is introduced.The antenna isbased on the dual-resonant antenna structure reported in [1].To our knowledge,this is the first internal handset antennawhich covers the E-GSM900 (880 MHz - 960 MHz),GSM1800 (1710 MHz - 1880 MHz),DECT (1880 MHz - 1900MHz),PCS1900 (1850 MHz - 1990 MHz),and UMTS (1900 MHz - 2170 MHz) frequencies with a return loss Lretn
用于移动电话的小型天线的发展已经收到,由于在过去的手机,要求sizereduction以保持射频功率量以下的手机用户规模标准化levelsregardless吸收,多模手机的推出几年了众多目光.单频段和双频段,其中theexternal鞭或螺旋天线已经通过内部短路贴片天线（或PIFA）取代手机已在themarket.可以设想,在未来也将有一个这severalcommunication系统运行的内部天线的需要.在本文中,一个multiresonant双频手机天线内部介绍.天线isbased对双谐振天线[1]报道结构.据我们所知,这是第一个内部手机antennawhich包括E - GSM900（880兆赫 - 960兆赫）,GSM1800（1710兆赫 - 1880兆赫）,DECT（1880兆赫 - 1900MHz的）PCS1900（1850兆赫 - 1990兆赫）,和UMTS（1900兆赫 - 2170兆赫）的频率与回波损耗Lretn
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