Multifrequency microstrip antenna and a device including said antenna
First Claim
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1. A multifrequency microstrip antenna including:
- a plane dielectric substrate;
a conductor constituting a ground plane on the bottom surface of said substrate;
a plurality of conductive zones on the top surface of the substrate and each having an elongate shape imparting a candlestick shape to the antenna;
an antenna coupling device common to all the conductive zones;
and wherein said conductive zones are separated from each other by slots the widths of which are very much less than the operating wavelengths of the antenna;
wherein said conductive zones are sufficiently decoupled from each other to enable various resonances to occur, respectively, in various areas formed by said zones, said resonances being at least approximately of the quarter-wave type;
and wherein each of said zones has an electric field node fixed by at least one short-circuit to the ground plane and said short-circuit is in the vicinity of the base of the candlestick.
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Abstract
A multifrequency microstrip antenna in accordance with the present invention includes two zones connected to a short-circuit consisting of two conductive strips. These zones are sufficiently decoupled from each other to enable two resonances to be established in two respective different areas formed by the zones. The resonances are at least approximately of the quarter-wave type and each has an electric field node fixed by the short-circuit. The same coupling device is used to excite the two resonances. The invention applies in particular to portable telephones and to their base stations.
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Citations
10 Claims
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1. A multifrequency microstrip antenna including:
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a plane dielectric substrate; a conductor constituting a ground plane on the bottom surface of said substrate; a plurality of conductive zones on the top surface of the substrate and each having an elongate shape imparting a candlestick shape to the antenna; an antenna coupling device common to all the conductive zones; and wherein said conductive zones are separated from each other by slots the widths of which are very much less than the operating wavelengths of the antenna; wherein said conductive zones are sufficiently decoupled from each other to enable various resonances to occur, respectively, in various areas formed by said zones, said resonances being at least approximately of the quarter-wave type; and wherein each of said zones has an electric field node fixed by at least one short-circuit to the ground plane and said short-circuit is in the vicinity of the base of the candlestick.
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2. A multifrequency microstrip antenna including:
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a dielectric substrate having two mutually opposed main surfaces extending in directions defined in said antenna and constituting horizontal directions, said two surfaces respectively constituting a bottom surface and a top surface, another direction being further defined in said antenna at an angle to each of said horizontal directions, said other direction constituting a vertical direction, a bottom conductive layer on said bottom surface and constituting a ground of said antenna, a top conductive layer on an area of said top surface above said ground having a plurality of conductive zones, to constitute a patch having a configuration, a length and a width, said length and said width being in two of said horizontal directions constituting a longitudinal direction and a transverse direction, respectively, said configuration forming at least one slot within said patch, said slot contributing to defining for said antenna a group of resonances including a plurality of resonances respectively corresponding to a plurality of operating modes and to a plurality of operating frequencies of said antenna, and an antenna coupling device including; a main conductor connected to said patch at a connecting point, and a ground conductor, so that said antenna can be connected to a signal processing unit via said device for each of said operating frequencies, wherein said conductive zones are separated from each other by slots the widths of which are very much less than the operating wavelengths of the antenna; wherein said conductive zones are sufficiently decoupled from each other to enable various resonances to occur, respectively, in various areas formed by said zones, said resonances being at least approximately of the quarter-wave type; wherein each of said zones has an electric field node fixed by at least one short-circuit to the ground plane; and wherein said at least one short-circuit electrically connects said patch to said ground at an edge of said patch, said edge extending in said transverse direction and constituting a rear edge defining in said patch in said longitudinal direction a rearward way directed towards said rear edge and an opposite forward way directed towards the front, two regions of said patch respectively constituting a rear region contiguous with said rear edge and a front region in front of said rear region, one slot opening towards the front and outside said patch to constitute a longitudinal separator slot dividing said front region into two of said zones respectively constituting a primary zone and a secondary zone, said connecting point being outside said secondary zone. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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Specification