Printed twin spiral dual band antenna
First Claim
1. A communication device for use in a radio communication system, said device comprising:
- a microphone opening for allowing the communication device to receive auditory information from a user;
a speaker opening for allowing the communication device to transmit auditory information to said user;
a keypad;
a multiple band antenna comprising;
a first arm and a second arm tuned to different frequency bands; and
a matching bridge, connected to a feeding part in which each of the arms are attached, for matching an input impedance of said antenna,wherein said multiple band antenna is a built-in antenna.
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Accused Products
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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Citations
21 Claims
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1. A communication device for use in a radio communication system, said device comprising:
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a microphone opening for allowing the communication device to receive auditory information from a user; a speaker opening for allowing the communication device to transmit auditory information to said user; a keypad; a multiple band antenna comprising; a first arm and a second arm tuned to different frequency bands; and a matching bridge, connected to a feeding part in which each of the arms are attached, for matching an input impedance of said antenna, wherein said multiple band antenna is a built-in antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication device for use in a radio communication system, said device comprising:
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a printed circuit board mounted on a chassis of said communication device; a substrate attached to said printed circuit board and having a predetermined thickness; and an antenna mounted on said substrate and comprising; first and second spiral arms which are resonant at different frequencies and a matching bridge connected to the spiral arms, by way of a feeding point, for matching an input impedance of said antenna, wherein said antenna is a built-in antenna. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An antenna for a radio communication device, said antenna comprising:
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two printed spiral arms each of which is tuned to a different frequency band; a matching bridge connected to the spiral arms for matching an input impedance of said antenna; and a loading resistor attached to the matching bridge for enhancing a bandwidth of the antenna wherein said antenna is a built-in antenna. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification