4) Influence of the human body

The human body has a substantial influence on the antenna performance, especially when the built-in antenna is used for mobile terminals. Therefore, quantitative antenna gain loss caused by the human body should be evaluated. In this experiment the standard sample board explained in section 1 was used.


・Fig. 4-1 and Fig. 4-2 show the VSWR property and radiation pattern of the standard antenna sample grasped by a human hand. Minimum peak of VSWR scarcely shifts from 430MHz and a 1.41 VSWR value at 430MHz. Moreover, degradation of the maximum antenna gain is hardly observed in Fig. 4-2.
・Fig. 4-3 and Fig.4-4 show the VSWR property and radiation pattern of the standard antenna sample attached to the abdomen of the human body. One plate of styrene foam with 10mm thickness was inserted between the body and the sample board considering that the actual PCB would be enclosed in a case. The VSWR property showed a frequency shift by about 5 MHz towards a lower frequency. The radiation pattern property in Fig. 4-4 indicates a unidirectional property vertically to the sample board.

 

 

 

 

 

 

 

 

 

 

 

 

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