在GSM短短几年的发展中，GSM900MHz成为全球数字网的主导标准，全球绝大部分的GSM运营商都选择了900MHz的频段。
文章摘要信息 关键词 ： 水平极化 全向天线 双频 [gap=741]Keywords : horizontal polarization;omni-directional antenna;dual band
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... double-framed generator ==> 双机座型发电机,内外机座型发电机 double frequency ==> 双频 double-frequency coding ==> 双频率编码 ...
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脑电双频指数 BIS ; Bispectral index ; Bispectralindexvalues
双频率电动机 dual-frequency motor ; frequency motor ; motor
抗耦双频激电仪 [地物] anti-coupling bi-frequency induced polarization instrument
同步双频 dual-band concurrent ; Concurrent dual-band ; dual-bconcurrent ; RSDB
双频信号 two-frequency signal ; Double frequency signal
双频激光干涉仪 dual-frequency laser interferometer ; frequency laser interferometer ; Laser measurement system
双频无缝切换 Dual Band Seamless Handovers
双频率激光器 two frequency laser
双频手机 Dual-Band Mobile Phone ; dual-band handset
The test results show that the design meets the application requirements and can be applied to other types of dual-frequency or even multi-frequency receiver design.
测试结果表明该方案及电路满足实际应用的要求,并可推广应用于其它类型双频甚至多频接收机的设计。
参考来源 - 双频GPS接收机下变频电路设计After that, broad band transformer, impedance tapered lines, single and dual-band quadrature hybrid are designed and simulated. The results by simulation satisfy the design requirements, with size reduction of about 50%.
设计了基于局部基片集成人工介质结构小型宽带阻抗变换器、渐变阻抗变换器、分支线耦合器和加载分支线双频耦合器,并对它们进行了仿真分析,仿真结果能够达到设计要求,并且电路尺寸有了比较明显的减小。
参考来源 - 基片集成人工介质阻抗变换器、耦合器的研究At present, dual-frequency receivers have been commonly used in GNSS precise navigation and positioning mainly to eliminate the ionospheric error.
目前,GNSS精密导航与定位一般都采用双频接收机,其主要原因是为了消除电离层误差的影响。
参考来源 - GNSS单频接收机精密点定位统一性方法的研究The article proposed three programs using different radio frequency chips, 433MHz ultra HF system, the CC1100 chip using the program, while the 2.4GHz MW systems using CC2500 chip, dual-band system is a combination of high-low frequency.
文章提出的三种方案中采用的射频芯片各不相同,433MHz的超高频系统方案采用CC1100芯片,而2.4GHz的微波系统方案采用CC2500芯片,双频系统是高低频相结合。
参考来源 - 基于RFID的矿井人员定位射频读写系统的设计double-frequency vibrating pressing machine. According to the theory of double-frequency vibrating pressing, the main parameters of this double- frequency vibrating pressing model machine is decided.
针对双频振动压实理论，确定了双频振动压实机的主要设计参数，并建立了数学模型。
参考来源 - 双频振动压实机的设计及性能研究·2,447,543篇论文数据，部分数据来源于NoteExpress
并介绍了双频激光同轴量规计的设计方法、工作原理及利用它对标准件定标的情况。
It also involves the design method, principle of two-frequency laser gauge meter and the result of verifications of standard devices using the gauge.
双频路由器发送2.4GHz和5GHz两种频段信号，使之成为一个使用同样名称和密码的网络。
Dual-band routers transmit both the 2.4GHz and 5GHz bands as one network with the same name and password.
最后对双频蝶形微带天线的贴片参数与馈电位置综合进行了优化，使之准确实现双频工作。
By optimizing the parameters of the patch and the feed position, the bow-tie microstrip can operate well on dual frequencies.
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