| 摘要 |
<p>User's acquisition of a high antenna gain in a simple constitution under various service conditions of a portable radio apparatus. The length of approximately half wavelength of an antenna element made of a conductor plate is used as a monopole section (1) and disposed along inside of the upper-end housing of a portable radio apparatus (6). The length of approximately quarter wavelength of the antenna element is used as an inverse F antenna section and disposed in parallel with the face of the ground plate (5) of the a radio apparatus (6). The inverse F antenna section (2) is disposed in parallel (in the Y-axis direction) with the upper end of the portable radio apparatus (6). The inverse F antenna section (2) is grounded to the ground plate (5) via a ground point (3) provided at one end. A power feed point (4) is provided at a predetermined distance away from this ground point. This constitution dispenses with a matching circuit, simplifies a portable radio apparatus, and enables a high antenna gain under various service conditions.</p> |
