In this article, a low-profile wideband dual-polarized planar printed dipole antenna, fed by coaxial lines, is investigated for the TD-SCDMA operation. The antenna is composed of two printed dipoles, two pairs of feed...In this article, a low-profile wideband dual-polarized planar printed dipole antenna, fed by coaxial lines, is investigated for the TD-SCDMA operation. The antenna is composed of two printed dipoles, two pairs of feeding coaxial lines and a ground. The single-polarized planar printed rectangular dipole and petal dipole, with the similar configuration, are first studied, exhibiting the potential wideband operation. Two petal dipoles are then cross-arranged to design a dual-polarized planar printed antenna, giving a lower profile and a better bandwidth covering the Chinese TD-SCDMA band (1880-2400 MHz). The dual-polarized antenna is simply excited by two pairs of coaxial feeds. Simulated and measured results show that the antenna achieves a common impedance bandwidth of 42% at both ports, good isolation of more than 25 dB, stable radiation patterns and the gain of about 7 dBi over the operating bandwidth.展开更多
目的:探讨住院患者检验报告由病区医生站进行自主打印的新模式。方法 :使用Delphi 6.0编程语言编写自助打印程序,首先挂接医院信息系统(hospital information system,HIS)的Oracle数据库获取在院及出院患者明细,进而根据明细挂接实验室...目的:探讨住院患者检验报告由病区医生站进行自主打印的新模式。方法 :使用Delphi 6.0编程语言编写自助打印程序,首先挂接医院信息系统(hospital information system,HIS)的Oracle数据库获取在院及出院患者明细,进而根据明细挂接实验室信息系统(laboratory information system,LIS)的SQL数据库进行检验结果及打印标识查询,并对检验报告进行打印。结果:新的检验报告打印模式大大节省了检验科打印及分发下送的精力,缩短了医生手工粘贴报告的时间,降低了漏贴及误贴率,同时避免了由检验单引起的病菌传播,提高了病历质量。结论:该打印模式充分利用网络不受空间限制的特点,实现了高度数据共享,提高了工作效率,值得推广应用。展开更多
设计并优化了一款适用于LTE天线系统的基站天线振子单元。在印刷偶极子天线以及微带巴伦的基础上,通过等效电路模型进行分析,设计出该天线的多级阻抗匹配巴伦。采用寄生贴片、领结型设计等技术,有效地拓展了天线频带带宽,实现了±45...设计并优化了一款适用于LTE天线系统的基站天线振子单元。在印刷偶极子天线以及微带巴伦的基础上,通过等效电路模型进行分析,设计出该天线的多级阻抗匹配巴伦。采用寄生贴片、领结型设计等技术,有效地拓展了天线频带带宽,实现了±45°双极化。仿真结果表明,天线的VSWR≤1.5和回波损耗大于15 d B的带宽达到了54.5%,可以覆盖GSM1800,CDMA2000,WCDMA,TD-SCDMA和LTE系统。在此频带范围内,该天线的驻波特性、方向性、增益和隔离度等指标均满足LTE多模式系统的指标。同时该天线也易于制作,适用于LTE多模式基站天线系统。展开更多
文摘In this article, a low-profile wideband dual-polarized planar printed dipole antenna, fed by coaxial lines, is investigated for the TD-SCDMA operation. The antenna is composed of two printed dipoles, two pairs of feeding coaxial lines and a ground. The single-polarized planar printed rectangular dipole and petal dipole, with the similar configuration, are first studied, exhibiting the potential wideband operation. Two petal dipoles are then cross-arranged to design a dual-polarized planar printed antenna, giving a lower profile and a better bandwidth covering the Chinese TD-SCDMA band (1880-2400 MHz). The dual-polarized antenna is simply excited by two pairs of coaxial feeds. Simulated and measured results show that the antenna achieves a common impedance bandwidth of 42% at both ports, good isolation of more than 25 dB, stable radiation patterns and the gain of about 7 dBi over the operating bandwidth.
文摘目的:探讨住院患者检验报告由病区医生站进行自主打印的新模式。方法 :使用Delphi 6.0编程语言编写自助打印程序,首先挂接医院信息系统(hospital information system,HIS)的Oracle数据库获取在院及出院患者明细,进而根据明细挂接实验室信息系统(laboratory information system,LIS)的SQL数据库进行检验结果及打印标识查询,并对检验报告进行打印。结果:新的检验报告打印模式大大节省了检验科打印及分发下送的精力,缩短了医生手工粘贴报告的时间,降低了漏贴及误贴率,同时避免了由检验单引起的病菌传播,提高了病历质量。结论:该打印模式充分利用网络不受空间限制的特点,实现了高度数据共享,提高了工作效率,值得推广应用。
文摘设计并优化了一款适用于LTE天线系统的基站天线振子单元。在印刷偶极子天线以及微带巴伦的基础上,通过等效电路模型进行分析,设计出该天线的多级阻抗匹配巴伦。采用寄生贴片、领结型设计等技术,有效地拓展了天线频带带宽,实现了±45°双极化。仿真结果表明,天线的VSWR≤1.5和回波损耗大于15 d B的带宽达到了54.5%,可以覆盖GSM1800,CDMA2000,WCDMA,TD-SCDMA和LTE系统。在此频带范围内,该天线的驻波特性、方向性、增益和隔离度等指标均满足LTE多模式系统的指标。同时该天线也易于制作,适用于LTE多模式基站天线系统。
