Internal Multiband Antenna and Methods
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Abstract
A multiband antenna intended for small-sized radio devices, internal to the device. The antenna comprises a main element (320) connected to the antenna feed conductor (326) and a short-circuited parasitic element (330). The feed point (FP) is beside the short-circuit point (S1) of the parasitic element. The elements are typically elongated, and at least their parts, which correspond a certain operating band, are substantially perpendicular to each other. Two resonances, the frequencies of which fall on two different operating bands of the antenna, are excited also in the parasitic element. In order to implement the resonances of the parasitic element, the coupling between the elements takes place through a very narrow slot (309) near the feed point and the short-circuit point of the parasitic element. The coupling is then sufficiently strong in spite of the positions of the main and the parasitic element. Even the lower operating band of the antenna can be made so wide that it covers the frequency ranges of two different systems.
112 Citations
64 Claims
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1-14. -14. (canceled)
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15. A multiband antenna comprising:
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a ground plane; a main element comprising a first part and a second part, wherein the first part is adapted to form at least a portion of a first resonator, and wherein the second part is adapted to form at least a portion of a second resonator; a parasitic element comprising a third part and a fourth part, wherein the third part is adapted form at least a portion of a third resonator, and wherein the fourth part is adapted to form at least a portion of a fourth resonator; a feed conductor adapted to connect to the main element at a feed point; and a first short-circuit conductor adapted to connect to the parasitic element at a first short-circuit point. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus comprising:
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a ground plane; a main element comprising a first part and a second part, wherein the first part is adapted to form at least a portion of a first resonator, and wherein the second part is adapted to form at least a portion of a second resonator; a parasitic element comprising a third part and a fourth part, wherein the third part is adapted form at least a portion of a third resonator, and wherein the fourth part is adapted to form at least a portion of a fourth resonator; a feed conductor adapted to connect to the main element at a feed point; and a first short-circuit conductor adapted to connect to the parasitic element at a first short-circuit point. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An apparatus comprising:
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a ground plane; a main element comprising a first part and a second part each adapted to resonate at separate frequencies; a parasitic element comprising a third part and a fourth part each adapted to resonate at separate frequencies; a feed conductor adapted to connect to the main element at a feed point; and a first short-circuit conductor adapted to connect to the parasitic element at a first short-circuit point. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
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49. An internal antenna having at least a lower and an upper operating band, comprising a ground plane, a radiating main element, a radiating parasitic element, an antenna feed conductor connected to the main element at a feed point, and a first short-circuit conductor connected to the parasitic element at a first short-circuit point, the main element comprising a first and a second radiating part, and the parasitic element comprising a third and a fourth radiating part, each radiating part having a major dimension of its own, wherein:
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the first radiating part together with the surrounding parts of the antenna forming a first resonator having its natural frequency in the lower operating band of the antenna; the second radiating part together with the surrounding parts of the antenna forming a second resonator having its natural frequency in the upper operating band of the antenna; the third radiating part together with the surrounding parts of the antenna forming a third resonator having its natural frequency in the lower operating band of the antenna; and the fourth radiating part together with the surrounding parts of the antenna forming a fourth resonator having its natural frequency in the upper operating band of the antenna; said antenna further characterized in that; at least the major dimensions of the radiating parts are substantially perpendicular to each other; and the feed point is proximate to the first short-circuit point, and between the starting portion of the main element, as seen from the feed point, and the starting portion of the parasitic element, as seen from the first short-circuit point, comprises a slot, the width of which is at the most of the order of magnitude of one hundredth of the wavelength corresponding to the highest operating frequency of the antenna to create a sufficient coupling between the main and the parasitic element. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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63. A method of operating a multiband antenna comprising a main element connected to a antenna feed conductor and a short-circuited parasitic element having a feed point proximate thereto, the method comprising:
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exciting at least first and second resonances in said main element; and exciting at least third and fourth resonances in said parasitic element; wherein the frequencies of said first and second resonances and said third and fourth resonances fall within first and second different operating bands of the antenna, respectively. - View Dependent Claims (64)
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Specification