Dual frequency band inverted-F antenna
First Claim
1. A dual frequency band inverted-F antenna for communicating a low frequency signal and a high frequency signal, comprising:
- a substrate;
a ground metal, which is formed on a lower surface of said substrate;
a vortical metal structure, which is formed on an upper surface of said substrate, further having a short circuit end and an open circuit end wherein said open circuit end is located within a center of said vortical metal structure;
a short circuit leg, which connects electrically said short circuit end of said vortical metal structure with said ground metal;
a feeding leg, which extends along a predetermined direction of said vortical metal structure to couple with a feeding circuit on said substrate; and
a terminal micro strip, which is fabricated on the lower surface of said substrate and connected electrically to said open circuit end through a first conductive aperture;
wherein, by increasing an encircling number of said vortical metal structure to generate a coupling effect so that an equivalent wavelength of said high frequency signal becomes longer and thereby a resonance frequency at a lower frequency band and a second frequency is added for communicating at a higher frequency band.
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Accused Products
Abstract
A dual frequency band inverted-F antenna used for communicating a low frequency signal and a high frequency signal includes a substrate, a ground metal, a vortical metal structure, a short circuit leg, a feeding leg, and a terminal micro strip. The ground metal and the terminal micro strip are formed on the lower surface of the substrate. The vortical metal structure, formed on the upper surface of the substrate, further has a short circuit end and an open circuit end. The short circuit leg connects electrically the short circuit end of the vortical metal structure with the ground metal. The feeding leg extends along a predetermined direction of the vortical metal structure to couple with a feeding circuit on the substrate. The terminal micro strip connects electrically to the open circuit end through a first conductive aperture. By increasing the encircling number of the vortical metal structure, the coupling effect is generated so that the equivalent wavelength of the high frequency signal can be longer, thus the resonance frequency thereof can be reduced, and so a first frequency can be still kept communicating at a lower frequency band and a second frequency can also be added for communicating at a higher frequency band.
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Citations
6 Claims
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1. A dual frequency band inverted-F antenna for communicating a low frequency signal and a high frequency signal, comprising:
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a substrate;
a ground metal, which is formed on a lower surface of said substrate;
a vortical metal structure, which is formed on an upper surface of said substrate, further having a short circuit end and an open circuit end wherein said open circuit end is located within a center of said vortical metal structure;
a short circuit leg, which connects electrically said short circuit end of said vortical metal structure with said ground metal;
a feeding leg, which extends along a predetermined direction of said vortical metal structure to couple with a feeding circuit on said substrate; and
a terminal micro strip, which is fabricated on the lower surface of said substrate and connected electrically to said open circuit end through a first conductive aperture;
wherein, by increasing an encircling number of said vortical metal structure to generate a coupling effect so that an equivalent wavelength of said high frequency signal becomes longer and thereby a resonance frequency at a lower frequency band and a second frequency is added for communicating at a higher frequency band. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification