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
双频率电动机 dual-frequency 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 ; RSDB
双频信号 two-frequency signal ; Double frequency signal
双频激光干涉仪 dual-frequency laser interferometer
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
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.
双频激光干涉仪是应用广泛的精密测量仪器。
Dual-frequency laser interferometer is a widely used precision measurement instrument.
双频梯度测量法有抗干扰能力强、分辨率高、仪器轻便等特点，实践证明应用效果很好。
Characterized by strong anti-interference capacity, high resolution ratio and portability of the instrument, the dual frequency gradient method has proved effective in practice.
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