Multiband antenna with parasitically-coupled resonators
First Claim
1. A multiband antenna comprising:
- an RF feed;
a ground plane;
at least two resonators, the at least two resonators containing a first resonator and a second resonator that are driven directly by the RF feed and resonate in different frequency bands; and
at least one parasitically coupled resonator that is connected to the ground plane, electromagnetically coupled to the first resonator and the second resonator, and resonates near the frequency band of the second resonator.
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Accused Products
Abstract
A multiband antenna includes at least two resonators that are driven directly and resonate in different frequency bands and a parasitically coupled resonator that resonates in one of the frequency bands. The coupled resonator is grounded with a conductive trace at one end and is thus not directly fed by the RF feed of the antenna. The coupled resonator increases the efficiency bandwidth near the frequency of operation for the coupled resonator. The antenna is fabricated from a stamped metal that is bent around or overmolded by a spacer layer. A clip formed integrally with the antenna by bending a portion of the ground plane permits attachment to the metal shield of the display of a laptop computer and is thus grounded along its length.
44 Citations
30 Claims
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1. A multiband antenna comprising:
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an RF feed;
a ground plane;
at least two resonators, the at least two resonators containing a first resonator and a second resonator that are driven directly by the RF feed and resonate in different frequency bands; and
at least one parasitically coupled resonator that is connected to the ground plane, electromagnetically coupled to the first resonator and the second resonator, and resonates near the frequency band of the second resonator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An antenna system comprising:
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an antenna containing at least one resonator that resonates in a desired frequency band and a ground plane; and
at least one clip that is attachable to an external grounding sheet or the ground plane. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for improving efficiency of a multiband antenna comprising:
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forming a ground plane;
forming at least two resonators that resonate at different frequency bands;
connecting an RF feed to the at least two resonators such that a first resonator of the at least two resonators has a reverse-fed connection in which a radiating end of the first resonator is more proximate to a short between the first resonator and the ground plane than to the RF feed; and
connecting the ground plane to a coupled resonator that is coupled to a first resonator and a second resonator of the at least two resonators and resonates near the frequency band of the second resonator. - View Dependent Claims (27, 28, 29, 30)
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Specification