Miniature printed spiral antenna for mobile terminals
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;
an antenna comprising a printed spiral metallic strip, wherein said antenna is a built-in antenna; and
a matching bridge for matching an input impedance of said antenna.
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Accused Products
Abstract
The present invention seeks to overcome the above-identified deficiencies in the art by providing a built-in printed spiral antenna which is small enough to satisfy the needs of future compact mobile terminals. According to exemplary embodiments, 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 {fraction (1/10)} of the wavelength of the operating frequency). As a result, the antenna can be used in a very compact chassis.
231 Citations
20 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;
an antenna comprising a printed spiral metallic strip, wherein said antenna is a built-in antenna; and
a matching bridge for matching an input impedance of said antenna. - View Dependent Claims (2, 3, 4, 5)
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6. 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;
an antenna comprising a printed spiral metallic strip, wherein said antenna is a built-in antenna;
a matching bridge for matching an input impedance of said antenna; and
a loading resistor attached to said matching bridge for enhancing a bandwidth of said antenna.
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7. 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;
an antenna mounted on said substrate and comprising a printed spiral metallic strip, wherein said antenna is a built-in antenna; and
a matching bridge for matching an input impedance of said antenna. - View Dependent Claims (8, 9)
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10. 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;
an antenna mounted on said substrate and comprising a printed spiral metallic strip, wherein said antenna is a built-in antenna; and
a matching bridge for matching an input impedance of said antenna and located between a feeding point and a grounded post. - View Dependent Claims (11, 12, 13)
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14. An antenna for a radio communication device, said antenna comprising:
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a printed spiral metallic strip;
a matching bridge for matching an input impedance of said antenna; and
a loading resistor attached to said matching bridge;
wherein said antenna is a built-in antenna. - View Dependent Claims (15, 16, 17, 18, 19)
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20. 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;
an antenna comprising a printed spiral metallic strip, wherein said antenna is a built-in antenna; and
a matching bridge for matching an input impedance of said antenna, wherein said matching bridge is interposed between a ground post and a feeding point and wherein said matching bridge, ground post, and feeding point are located at one end of said printed spiral metallic strip.
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Specification