In this paper, an internal multiband antenna is proposed for LTE-A/WWAN wireless applications in tablet computer. The proposed antenna is configured to have two branch radiators. These two branch radiators are a U-sha...In this paper, an internal multiband antenna is proposed for LTE-A/WWAN wireless applications in tablet computer. The proposed antenna is configured to have two branch radiators. These two branch radiators are a U-shaped driven monopole and a nonuniform wrapped inverted U-shaped monopole. The impedance bandwidths across dual operating bands are 89.7 MHz and 4185 MHz at the LTE-A/WWAN bands. Various techniques, such as branching and parasitic element are used to enhance the antenna’s bandwidth, the matching, and the size of the proposed antenna. The antenna is presented on an area of 50 × 15 mm2. Experimental results of this antenna show nearly omni-directional coverage and stable gain variation across the LTE-A/WWAN bands.展开更多
终端管控技术是指在不依附于运营商和用户的前提下,通过第三方设备对通信终端进行有效控制。为了解决管控成本高、时延大等问题,提出了面向不同场景的长期演进(long term evolution,LTE)管控方案,包括全覆盖管控方案和目标终端管控方案...终端管控技术是指在不依附于运营商和用户的前提下,通过第三方设备对通信终端进行有效控制。为了解决管控成本高、时延大等问题,提出了面向不同场景的长期演进(long term evolution,LTE)管控方案,包括全覆盖管控方案和目标终端管控方案。基于LTE终端定时同步的原理向终端发送同步诱导信号来完成对终端的吸附,构造跟踪区域更新拒绝信令和附着拒绝信令,根据信令所携带的不同核心网信息分别实现LTE终端全覆盖管控和目标终端管控。实验结果表明,提出的全覆盖管控方案能够阻断虚拟基站信号覆盖范围内所有LTE终端与外界进行通信,同时降低了管控成本。相比于传统LTE目标终端管控技术,目标终端管控方案优势在于不仅降低了管控时延,而且可以在目标用户无感知情况下完成其身份信息的检测并阻断包括长期演进语音承载(voice over long term evolution,VOLTE)终端在内的目标LTE终端与外界进行通信。展开更多
提出了一种新型频率可重构的手机天线,尺寸为43mm×9mm×3mm.该天线由曲折馈电枝节、耦合枝节,以及多路射频开关(RF-Switch)组成.通过RF-Switch接入不同的电感改变天线的感抗值和带线的有效电长度,在低频段得到了四种不同的工...提出了一种新型频率可重构的手机天线,尺寸为43mm×9mm×3mm.该天线由曲折馈电枝节、耦合枝节,以及多路射频开关(RF-Switch)组成.通过RF-Switch接入不同的电感改变天线的感抗值和带线的有效电长度,在低频段得到了四种不同的工作状态,天线的低频带宽显著增加.研究结果表明:所设计天线能够很好地覆盖长期演进(Long Term Evolution,LTE)、无线广域网(Wireless Wide Area Network,WWAN)八个频带且频段内回波损耗小于-6dB.实测表明天线具有良好的辐射效率和辐射增益,能够实现全向覆盖,具有很好的应用前景.展开更多
文摘In this paper, an internal multiband antenna is proposed for LTE-A/WWAN wireless applications in tablet computer. The proposed antenna is configured to have two branch radiators. These two branch radiators are a U-shaped driven monopole and a nonuniform wrapped inverted U-shaped monopole. The impedance bandwidths across dual operating bands are 89.7 MHz and 4185 MHz at the LTE-A/WWAN bands. Various techniques, such as branching and parasitic element are used to enhance the antenna’s bandwidth, the matching, and the size of the proposed antenna. The antenna is presented on an area of 50 × 15 mm2. Experimental results of this antenna show nearly omni-directional coverage and stable gain variation across the LTE-A/WWAN bands.
文摘终端管控技术是指在不依附于运营商和用户的前提下,通过第三方设备对通信终端进行有效控制。为了解决管控成本高、时延大等问题,提出了面向不同场景的长期演进(long term evolution,LTE)管控方案,包括全覆盖管控方案和目标终端管控方案。基于LTE终端定时同步的原理向终端发送同步诱导信号来完成对终端的吸附,构造跟踪区域更新拒绝信令和附着拒绝信令,根据信令所携带的不同核心网信息分别实现LTE终端全覆盖管控和目标终端管控。实验结果表明,提出的全覆盖管控方案能够阻断虚拟基站信号覆盖范围内所有LTE终端与外界进行通信,同时降低了管控成本。相比于传统LTE目标终端管控技术,目标终端管控方案优势在于不仅降低了管控时延,而且可以在目标用户无感知情况下完成其身份信息的检测并阻断包括长期演进语音承载(voice over long term evolution,VOLTE)终端在内的目标LTE终端与外界进行通信。
文摘提出了一种新型频率可重构的手机天线,尺寸为43mm×9mm×3mm.该天线由曲折馈电枝节、耦合枝节,以及多路射频开关(RF-Switch)组成.通过RF-Switch接入不同的电感改变天线的感抗值和带线的有效电长度,在低频段得到了四种不同的工作状态,天线的低频带宽显著增加.研究结果表明:所设计天线能够很好地覆盖长期演进(Long Term Evolution,LTE)、无线广域网(Wireless Wide Area Network,WWAN)八个频带且频段内回波损耗小于-6dB.实测表明天线具有良好的辐射效率和辐射增益,能够实现全向覆盖,具有很好的应用前景.