| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent any adverse influence such as the deterioration of an antenna gain to be generated due to the existence of a glass supposing the communication through a glass with an outside device. SOLUTION: An incident wave 41 radiated from a radiator 31, and made incident to a front glass 5 is divided into a reflected wave 42 reflected on an in-vehicle side boundary face 51 and a transmitted wave 43 transmitted inside the front glass 5, and the reflected wave 42 is divided into a re-radiated wave 47 connected to and re-radiated from the radiator 31 and a reflected wave 46 reflected on a high frequency substrate 21. As the result of the repetition of the above operations, a standing wave is generated between an antenna 34 for on-vehicle radio equipment and the front glass 5, and the gain of the antenna 34 for the on-vehicle radio equipment shows constant regularity as indicated by Finger (b) depending on a distance L between the antenna 34 for the on-vehicle radio equipment and the front glass 5. Then, the distance L between the antenna 34 for the on-vehicle equipment and the front glass 5 is considered so that the relative gain can be turned to be the maximum value or the maximum neighborhood point in Figure (b).</p> |
