| 摘要 |
<p>A built-in antenna is provided which includes a printed spiral metal strip that is connected to the mobile terminal's printed circuit board via a substrate. Matching of the antenna is performed by a matching bridge which is positioned between a feeding pin and a grounded post. By adjusting the length of the matching bridge, the matching of the antenna can be changed. In an alternative embodiment, a loading resistor is attached to the matching bridge in order to enhance the bandwidth of the antenna. The size of the antenna of the present invention can be reduced to 20-30 % of the conventional PIFA antenna (i.e., less than 1/10 of the wavelength of the operating frequency). As a result, the antenna can be used in a very compact chassis.</p> |
