Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1998-07-09
2000-12-26
Wong, Don
Communications: radio wave antennas
Antennas
With radio cabinet
343700MS, 343895, 343850, H01Q 124
Patent
active
061666947
ABSTRACT:
The present invention overcomes the above-identified deficiencies in the art by providing a miniature, built-in dual band antenna which is suitable for use in future compact mobile terminals. According to exemplary embodiments, a built-in antenna is provided which includes two spiral conductor arms which are of different lengths and capable of being tuned to different frequency bands. The spiral arms are mounted on 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 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.
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Chen Shih-Chao
Telefonaktiebolaget LM Ericsson (publ)
Wong Don
LandOfFree
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