Dual-resonant antenna
First Claim
1. An antenna comprising:
- a radiative element;
a feed pin electrically connected to the radiative element; and
a matching network electrically connected to a ground plane, wherein the matching network comprises;
an inductive element electrically connected to the feed pin; and
a capacitor connected in parallel to the inductive element, wherein the inductive element has a center tap for determining impedance of the matching network relative to impedance of the antenna.
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0 Petitions
Accused Products
Abstract
A wide-band antenna comprises a series-resonant antenna and a resonant circuit. The antenna has a radiative element and a feed pin. The resonant circuit comprises an inductive element connected to the feed pin and a capacitor connected in parallel to the inductive element, which has a center tap for adjusting the impedance of the resonant circuit relative to the antenna impedance. The antenna can be a low-impedance PILA, a helix, monopole, whip, stub or loop antenna. The wide-band antenna can be used for the low (1 GHz range) or high (2 GHz range) band. The antenna can be made to simultaneously cover both 850 & 900 bands with the ground plane small enough to be implemented in a mobile phone or the like. The center tap is either connected to the feed of the antenna or connected to an RF front-end dependent upon the impedance level of the antenna element.
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Citations
22 Claims
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1. An antenna comprising:
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a radiative element; a feed pin electrically connected to the radiative element; and a matching network electrically connected to a ground plane, wherein the matching network comprises; an inductive element electrically connected to the feed pin; and a capacitor connected in parallel to the inductive element, wherein the inductive element has a center tap for determining impedance of the matching network relative to impedance of the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna system comprising:
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a circuit board with a ground plane; an antenna having an antenna impedance disposed in relation to the circuit board, the antenna comprising; a radiative element; a feed pin electrically connected to the radiative element; and a matching network electrically connected to the ground plane, wherein the matching network comprises; an inductive element electrically connected to the feed pin; and a capacitor connected in parallel to the inductive element, wherein the inductive element has a center tap for determining impedance of the matching network relative to the antenna impedance; and an RF front-end operatively connected to the antenna. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method to increase a bandwidth of an antenna having an antenna impedance for use with a ground plane and electrically connected to an RF front-end, the RF front-end having a load impedance, the antenna having
a radiative element disposed in relationship with the ground plane; -
a feed pin electrically connected to the radiative element, said method comprising; providing a matching network between the antenna and the RF front-end, the network having an inductive element and a capacitor connected in series, the inductive element having a center tap; and electrically connecting the center tap to the feed pin or the RF front-end for adjusting the matching network relative to the antenna impedance.
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Specification