Antenna with stacked resonant structures and a multi-frequency radiocommunications system including it
First Claim
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1. An antenna with stacked resonant structures, the antenna including:
- two resonant structures facing each other on respective opposite sides of a plane occupied by a conductive layer constituting a coupling layer, the two structures having respective resonant frequencies with a defined frequency ratio, and an internal coupling system including at least one slot formed in the coupling layer to enable coupling of the two resonant structures to a processor unit external to the antenna, in which antenna said two resonant structures are sufficiently decoupled from one another by said coupling layer for the coupling of each of the two structures to said processor unit via said internal coupling system to be substantially independent of the other of the two structures, said frequency ratio departing significantly from a value imposed on that ratio by coupling between the two structures.
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Abstract
An antenna with stacked resonant structures includes: a guide line for guiding electromagnetic waves formed in a conductive layer lying in a plane, and two resonant structures having different resonant frequencies, the two structures being formed on respective opposite sides of the plane so that both are coupled directly to the line and substantially decoupled from one another by the conductive layer. The guide line is preferably of the coplanar type and the two resonant structure are preferably of the quarter-wave type. The invention applies in particular to dual-band mobile telephones.
89 Citations
14 Claims
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1. An antenna with stacked resonant structures, the antenna including:
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two resonant structures facing each other on respective opposite sides of a plane occupied by a conductive layer constituting a coupling layer, the two structures having respective resonant frequencies with a defined frequency ratio, and an internal coupling system including at least one slot formed in the coupling layer to enable coupling of the two resonant structures to a processor unit external to the antenna, in which antenna said two resonant structures are sufficiently decoupled from one another by said coupling layer for the coupling of each of the two structures to said processor unit via said internal coupling system to be substantially independent of the other of the two structures, said frequency ratio departing significantly from a value imposed on that ratio by coupling between the two structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A multifrequency radiocommunications system including:
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a processor unit adapted to transmit and/or to receive a guided electromagnetic wave that can have two frequencies, and an antenna connected to the processor unit to couple the guided wave to radiated waves, in which system said antenna comprises;
two resonant structures facing each other on respective opposite sides of a plane occupied by a conductive layer constituting a coupling layer, the two structures having respective resonant frequencies with a defined frequency ratio, and an internal coupling system including at least one slot formed in the coupling layer to enable coupling of the two resonant structures to said processor unit external to the antenna, in which antenna said two resonant structures are sufficiently decoupled from one another by said coupling layer for the coupling of each of the two structures to said processor unit via said internal coupling system to be substantially independent of the other of the two structures, said frequency ratio departing significantly from a value imposed on that ratio by coupling between the two structures and said two resonant structures respectively resonate at said two frequencies of the guided electromagnetic wave.
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Specification