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,wherein Q of the coupled resonator is substantially the same as Q of the second resonator, andwherein the coupled resonator and at least one of the first resonator and the second resonator are colinear.
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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.
60 Citations
47 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, wherein Q of the coupled resonator is substantially the same as Q of the second resonator, and wherein the coupled resonator and at least one of the first resonator and the second resonator are colinear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. 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, wherein the at least one clip is formed separate from the antenna and on an attachment device that further comprises at least one bracket containing a hole. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. 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 (23, 24, 25, 26)
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27. 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, wherein the first resonator has a reverse-fed configuration in which a radiating end of the first resonator is more proximate to a short between the first resonator and ground plane than to the RF feed. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. 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, wherein the at least one clip is formed on an attachment device that further comprises a base from which the at least one clip extends, the base having an area about the same as or larger than an area of the ground plane. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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Specification