With the exponential development of mobile communications and the miniaturization of radio frequency transceivers, the need for small and low profile antennas at mobile frequencies is constantly growing. Therefore, ne...With the exponential development of mobile communications and the miniaturization of radio frequency transceivers, the need for small and low profile antennas at mobile frequencies is constantly growing. Therefore, new antennas should be developed to provide larger bandwidth and at the same time small dimensions. Although the gain in bandwidth performances of an antenna are directly related to its dimensions in relation to the wavelength, the aim is to keep the overall size of the antenna constant and from there, find the geometry and structure that give the best performance. The design and bandwidth optimization of a Planar Inverted-F Antenna (PIFA) were introduced in order to achieve a larger bandwidth in the 2 GHz band, using two optimization techniques based upon genetic algorithms (GA), namely the Binary Coded GA (BCGA) and Real-Coded GA (RCGA). During the optimization process, the different PIFA models were evaluated using the finite-difference time domain (FDTD) method-a technique belonging to the general class of differential time domain numerical modeling methods.展开更多
为研究当今移动终端金属器件对内置多频天线电磁特性的影响,提出平面倒F(planar inverted F antenna,PIFA)、单极、低温共烧陶瓷(low temperature co-fired ceramic,LTCC)在直板手机模式下,重点从天线的谐振频率、带宽和增益3个参数角...为研究当今移动终端金属器件对内置多频天线电磁特性的影响,提出平面倒F(planar inverted F antenna,PIFA)、单极、低温共烧陶瓷(low temperature co-fired ceramic,LTCC)在直板手机模式下,重点从天线的谐振频率、带宽和增益3个参数角度出发,分别研究了金属器件:扬声器、电池与3种不同类型天线的相对关系,以及对天线性能的影响。总结出3种不同类型的内置手机天线对终端环境的抗干扰特性。综合结果表明,PIFA、单极、LTCC天线的抗干扰特性依次增强;制作的实际模型与测试验证的仿真结果基本吻合。展开更多
文摘With the exponential development of mobile communications and the miniaturization of radio frequency transceivers, the need for small and low profile antennas at mobile frequencies is constantly growing. Therefore, new antennas should be developed to provide larger bandwidth and at the same time small dimensions. Although the gain in bandwidth performances of an antenna are directly related to its dimensions in relation to the wavelength, the aim is to keep the overall size of the antenna constant and from there, find the geometry and structure that give the best performance. The design and bandwidth optimization of a Planar Inverted-F Antenna (PIFA) were introduced in order to achieve a larger bandwidth in the 2 GHz band, using two optimization techniques based upon genetic algorithms (GA), namely the Binary Coded GA (BCGA) and Real-Coded GA (RCGA). During the optimization process, the different PIFA models were evaluated using the finite-difference time domain (FDTD) method-a technique belonging to the general class of differential time domain numerical modeling methods.
文摘为研究当今移动终端金属器件对内置多频天线电磁特性的影响,提出平面倒F(planar inverted F antenna,PIFA)、单极、低温共烧陶瓷(low temperature co-fired ceramic,LTCC)在直板手机模式下,重点从天线的谐振频率、带宽和增益3个参数角度出发,分别研究了金属器件:扬声器、电池与3种不同类型天线的相对关系,以及对天线性能的影响。总结出3种不同类型的内置手机天线对终端环境的抗干扰特性。综合结果表明,PIFA、单极、LTCC天线的抗干扰特性依次增强;制作的实际模型与测试验证的仿真结果基本吻合。
