为增加PCB平面电感器单位面积上的电感值,提出一种采用磁性基板作为PCB叠层制作高感值PCB平面电感器的方法,并将磁性基板应用于两种典型的平面螺旋电感结构设计中。采用HFSS全波仿真方法对采用常规FR4基板和磁性基板的平面电感设计进行...为增加PCB平面电感器单位面积上的电感值,提出一种采用磁性基板作为PCB叠层制作高感值PCB平面电感器的方法,并将磁性基板应用于两种典型的平面螺旋电感结构设计中。采用HFSS全波仿真方法对采用常规FR4基板和磁性基板的平面电感设计进行了比较,结果显示使用磁性基板能够在保持电感Q基本不变的情况下增大单位面积上的电感值,使用磁导率为2和1.5的磁性基板设计的电感器单位面积电感值能够达到13.1 n H/mm2和8.9 n H/mm2,与使用磁导率为1的FR4基板相比单位面积电感值的增大量与所使用磁性基板的磁导率基本成正比关系。展开更多
近场通信(Near Field Communication,NFC)系统通信频率为13.56 MHz,采用近场磁耦合方式进行信号传输,具有通信距离近、安全度高等特点,广泛应用在银联、公交、门禁等领域.随着NFC技术的发展,越来越多的智能终端设备中配备了NFC系统.由于...近场通信(Near Field Communication,NFC)系统通信频率为13.56 MHz,采用近场磁耦合方式进行信号传输,具有通信距离近、安全度高等特点,广泛应用在银联、公交、门禁等领域.随着NFC技术的发展,越来越多的智能终端设备中配备了NFC系统.由于NFC系统工作频率低,NFC天线面积较大,天线尺寸通常为30 mm×40 mm,而且配置磁性基板用于金属环境使用,这使NFC天线制造成本较高,不利于NFC系统应用.本文通过空间磁场分布理论计算,采用分布式磁性基板设计,大幅降低磁性基板使用面积,并通过NFC天线结构设计,提高天线磁场辐射性能.仿真与实验证明,该设计方法使NFC天线磁性基板使用面积下降约40%,且天线辐射能力增强.在提升天线性能的同时,有效降低天线成本.展开更多
Co5 Sm/Cr bilayer films were deposited on Si and glass slides by means of a Direct-Current （DC） magnetron sputtering system with substrate heating. Magnetic properties measurements show that the sample with glass su...Co5 Sm/Cr bilayer films were deposited on Si and glass slides by means of a Direct-Current （DC） magnetron sputtering system with substrate heating. Magnetic properties measurements show that the sample with glass substrate has a comparatively large coercivity （He = 2 141.20e） with a rela- tively low optimal temperature （ Ts =350 ℃ ）. X-ray diffraction patterns indicate that Cr presents a hexagonal-close-packed （hcp） texture on Si, while a body-centered-cubic （bcc） struc- ture on glass substrate, which leads to Cos Sm films having dif- ferent lattice constants on Si and glass substrates. At their opti- mal temperature, the grain size of the sample on glass slide is smaller with its size distribution more uniform. Concurrently, the shape of magnetic domain is more regular and ordered. The value of magnetic switching volume （ V ） for the film on glass is 1.65×10-18 cm3 , smaller than that for films on Si. For the film on glass, the magnetization reversal mechanism is mainly influenced by magnetocrystalline anisotropy, the shape of the crystal grain and the stress in the film.展开更多
文摘为增加PCB平面电感器单位面积上的电感值,提出一种采用磁性基板作为PCB叠层制作高感值PCB平面电感器的方法,并将磁性基板应用于两种典型的平面螺旋电感结构设计中。采用HFSS全波仿真方法对采用常规FR4基板和磁性基板的平面电感设计进行了比较,结果显示使用磁性基板能够在保持电感Q基本不变的情况下增大单位面积上的电感值,使用磁导率为2和1.5的磁性基板设计的电感器单位面积电感值能够达到13.1 n H/mm2和8.9 n H/mm2,与使用磁导率为1的FR4基板相比单位面积电感值的增大量与所使用磁性基板的磁导率基本成正比关系。
基金supported by National Science Foundation of China(10804026)Natural Science Foundation of Hebei Province(E2010000429)Foundation of Hebei Educational Committee(2006123)
文摘Co5 Sm/Cr bilayer films were deposited on Si and glass slides by means of a Direct-Current （DC） magnetron sputtering system with substrate heating. Magnetic properties measurements show that the sample with glass substrate has a comparatively large coercivity （He = 2 141.20e） with a rela- tively low optimal temperature （ Ts =350 ℃ ）. X-ray diffraction patterns indicate that Cr presents a hexagonal-close-packed （hcp） texture on Si, while a body-centered-cubic （bcc） struc- ture on glass substrate, which leads to Cos Sm films having dif- ferent lattice constants on Si and glass substrates. At their opti- mal temperature, the grain size of the sample on glass slide is smaller with its size distribution more uniform. Concurrently, the shape of magnetic domain is more regular and ordered. The value of magnetic switching volume （ V ） for the film on glass is 1.65×10-18 cm3 , smaller than that for films on Si. For the film on glass, the magnetization reversal mechanism is mainly influenced by magnetocrystalline anisotropy, the shape of the crystal grain and the stress in the film.
