Research on Desighn Method of Antennas Used for Compact Portable Telephine

为了建立用于便携式电话的天线的设计方法，已经使用由本研究者提出的新方法，Galerkin矩量法和时域有限差分（FDTD）法，对安装在便携式电话的导电体上的天线的特性进行了分析。采用FDTD方法设计并制作了本课题组研制的S形天线.将导体盒内绿色函数与矩量法相结合的新方法应用于导体盒天线的分析。结果表明，该方法的精度与传统的伽辽金矩量法相当，而计算时间仅为矩量法的1%左右。对安装在导电盒上的缝隙天线和微带天线的特性进行了数值计算。因此，已经证实， ...更多信息 该方法可用于便携式电话天线的数值设计。将该方法应用于有限长导电圆柱上缝隙天线的特性分析.采用时域有限差分法（FDTD）对便携式电话中常用的几种典型天线，如微带天线、平面倒F形天线和S形天线的特性进行了分析，验证了FDTD方法在便携式电话设计中的有效性。分析和讨论了电话机机身周围介质层的作用和人体的影响.采用FDTD方法对S形天线进行了数值设计和制作。实验表明，S形天线即使在便携式电话的体积小于100cm^2时也具有宽的频带宽度，并且在人体存在的情况下辐射效率的降低很小。少

In order to establish design methods of antennas used for the portable telephones, analyzes of the characteristics of antennas mounted on a conducting body of the portable telephone have been performed using a new method proposed by the present investigators, the Galerkin moment method and the finite diffierence time domain (FDTD) method. S-shaped antenna, which was developed by the present investigators, has been designed by the FDTD method and fabricated.1. The new method, combining the interior Green's function of the conducting box and the moment method has been applied to the analysis of the antennas mounted on the conducting box. The results show that the accuracy of the analysis is almost the same to that of the conventional Galerkin moment method, while the required CPU time is about 1% of that in the moment method. Numerical results of the characteristics of a slot antenna and a monopole antenna mounted on the conducting box have been obtained . Thus, it has been confirmed tha … More t the new method is available for the numerical design method of the portable telephone antennas. The present method has been applied to analyze the characteristics of a slot antenna on a conducting circular cylinder with finite length.2. The characteristics of typical antennas used for the portable telephone such as the monopole antenna, the planar inverted F-shaped antenna and the S-shaped antenna have been and analyzed by using the FDTD method, the validity of the FDTD method for the design method of the portable telephone has been confirmed. The effect of a dielectric layr surrounding the body of telephone and the influence of the human body have been also analyzed and discussed.3. S-shaped antenna has been numerically designed by the FDTD method and fabricated. It has been shown experimentally that the S-shaped antenna has a wide frequency band width even when the volume of the portable telephone is less than 100cm^2 and the decrease of the radiation efficiency in the presence of the human body is small. Less