Short-circuit microstrip antenna and device including that antenna
First Claim
Patent Images
1. A microstrip antenna including:
- a dielectric substrate having a bottom surface, a top surface and an edge surface,a conductive ground plane on said bottom surface,a conductive patch on said top surface,two short-circuit conductors on said edge surface and connecting said patch to said conductive ground, andconnecting conductors for transmitting a signal between said antenna and a signal processing unit;
wherein the connecting conductors include a coplanar line having a first section on the top face of the substrate and a second section on the edge surface and extending the first section with no significant impedance discontinuity, andwherein the antenna is symmetrical about a plane passing through an axis of symmetry of said patch in a vertical direction that is contained with the edge surface.
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Accused Products
Abstract
A microstrip antenna includes a composite short-circuit consisting of two conductive strips. A vertical strip, in the plane of the short-circuit between the two strips, is connected to the central conductor of a coupling line forming part of the antenna and enabling the coupling with a resonance thereof, as for example to excite such resonance. The short-circuit and the vertical strip constitute two terminals for said antenna, enabling it to be easily connected to a signal processing units, such as a transmitter. The antenna described includes two zones enabling it to operate at two frequencies. The antenna has particular utility in portable telephones and their base stations.
108 Citations
5 Claims
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1. A microstrip antenna including:
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a dielectric substrate having a bottom surface, a top surface and an edge surface, a conductive ground plane on said bottom surface, a conductive patch on said top surface, two short-circuit conductors on said edge surface and connecting said patch to said conductive ground, and connecting conductors for transmitting a signal between said antenna and a signal processing unit; wherein the connecting conductors include a coplanar line having a first section on the top face of the substrate and a second section on the edge surface and extending the first section with no significant impedance discontinuity, and wherein the antenna is symmetrical about a plane passing through an axis of symmetry of said patch in a vertical direction that is contained with the edge surface. - View Dependent Claims (2, 5)
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3. A microstrip antenna including:
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a dielectric substrate having a bottom surface, a top surface and an edge surface, a conductive ground plane on said bottom surface, a conductive patch on said top surface, two short-circuit conductors on said edge surface and connecting said patch to said conductive ground, and connecting conductors for transmitting a signal between said antenna and a signal processing unit; wherein the connecting conductors include a coplanar line having a first section on the top face of the substrate and a second section on the edge surface and extending the first section with no significant impedance discontinuity; including a resonant structure including; said dielectric substrate, said substrate having two mutually opposed main surfaces extending in directions defined in said antenna and constituting horizontal directions, said two surfaces respectively constituting said bottom surface and said 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, said edge surface containing said vertical direction, a conductive bottom layer on said bottom surface and constituting said ground of said antenna, a conductive top layer on an area of said top surface above said ground to constitute said patch, said patch having a configuration, edges, a length and a width, said length and said width extending in two of said horizontal directions constituting a longitudinal direction and a transverse direction, respectively, said edge surface further containing an edge of said patch, said edge extending in said transverse direction, and said short-circuit conductors extending in said vertical direction and imposing at least approximately on said resonant structure a quarter-wave type resonance, said antenna further including a coupling line adapted to couple a traveling wave propagating in said line and said resonance of the resonant structure, said line including; a main conductor connected to said patch at an internal connecting point, and a ground conductor parallel to and alongside said main conductor, wherein said main conductor of the coupling line includes a vertical section alongside said short-circuit conductors and constituting a first connecting conductor, said ground conductor of said line including a vertical section consisting of said short-circuit conductors to enable said resonant structure to be connected to said signal processing unit by means of a vertical line including said vertical sections of said conductors forming part of said coupling line, wherein said main conductor of the coupling line further includes a horizontal coupling strip formed in said top conductive layer and extending in said longitudinal direction to connect said vertical section of said conductor to said internal connecting point, said horizontal coupling strip being separated from said patch by two longitudinal lateral slots on respective edges of said strip, said ground conductor of said line further including a horizontal section consisting of said patch on either side of said coupling strip, said horizontal coupling strip and said horizontal section of the main conductor constituting a horizontal coplanar line, said antenna including a vertical conductive layer on areas of said edge surface, said short-circuit being a composite short-circuit including two of said short-circuit conductors, said two short-circuit conductors comprising two vertical short-circuit strips forming part of said vertical conductive layer on respective opposite sides of said vertical section of the main conductor of the coupling line which comprises a vertical coupling strip which is also part of said vertical conductive layer and is separated from said two short-circuit conductors by respective vertical lateral slots so that said vertical line section constitutes a vertical coplanar line connected to said horizontal coplanar line with no significant impedance discontinuity. - View Dependent Claims (4)
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Specification
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Current AssigneeWSOU Investments, LLC (WSOU Holdings, LLC)
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Original AssigneeAlcatel SA (Nokia Corporation)
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InventorsToutain, Serge, Lepennec, Francois, Coupez, Jean-Philippe, Lorcy, Laurence, Kouam, Charles Ngounou, Grangeat, Christophe
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Primary Examiner(s)Wimer, Michael C.
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Application NumberUS09/209,449Time in Patent Office676 DaysField of Search343/700 MSUS Class Current343/700.0MSCPC Class CodesH01P 5/08 for linking dissimilar line...H01Q 1/24 with receiving setH01Q 9/0407 Substantially flat resonant...H01Q 9/0421 with a shorting wall or a s...H01Q 9/045 with particular feeding mea...
