Compact printed antenna for radiation at low elevation
First Claim
1. A flat printed antenna for transmission and/or reception of microwave signals, the antenna comprising:
- a plate of dielectric substrate;
an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate;
a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate; and
means of feeding said antenna;
said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation pattern at low elevation characterized in that said radiating element has at least one slot allowing the control of the resonance frequency of a chosen higher mode, the at least one slot arranged approximately perpendicular to the current lines of said chosen higher mode.
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Accused Products
Abstract
This invention relates to a flat printed antenna for transmission and/or reception of microwave signals of the type that includes particularly
a plate of dielectric substrate
an earth plane formed by a first conductor layer deposited on a first face of the plate of dielectric substrate,
a radiating element (30) formed by a second conductor layer deposited on a second face of the plate of dielectric substrate,
means of feeding the antenna
This antenna has a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation pattern with low elevation,
According to the invention, the radiating element has at least one slot (31 to 34) allowing the control of the resonance frequency of a chosen higher mode.
54 Citations
19 Claims
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1. A flat printed antenna for transmission and/or reception of microwave signals, the antenna comprising:
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a plate of dielectric substrate; an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate; a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate; and means of feeding said antenna; said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation pattern at low elevation characterized in that said radiating element has at least one slot allowing the control of the resonance frequency of a chosen higher mode, the at least one slot arranged approximately perpendicular to the current lines of said chosen higher mode. - View Dependent Claims (2, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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3. A flat printed antenna for transmission and/or reception of microwave signals, the antenna comprising:
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a plate of dielectric substrate; an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate; a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate; and means of feeding said antenna said feeding means using a feed technique belonging to the group that includes; feed by a coaxial probe; feed by proximity coupling; feed through a feed line in the plane of the radiating element; and feed by coupling through slits; said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation pattern at low elevation, characterized in that said radiating element has at least one slot allowing the control of the resonance frequency of a chosen higher mode.
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4. A flat printed antenna for transmission and/or reception of microwave signals, the antenna comprising:
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a plate of dielectric substrate; an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate; a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate, the radiating element being in the form of a disc, said radiating element having four radial slots spaced two by two at angles of about 90 degrees; and means of feeding said antenna; said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation pattern at low elevation, characterized in that said four radial slots of said radiating element allow the control of the resonance frequency of a chosen higher mode wherein said chosen higher mode is the TM21 mode, whose current lines form a pattern that is repeated in each quarter of said disc, each of said four radial slots being approximately perpendicular to the current lines of one of said disc quarters.
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5. A flat printed antenna for transmission and/or reception of microwave signals, the antenna comprising:
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a plate of dielectric substrate; an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate; a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate, the radiating element being in the form of a disc, said radiating element having at least one circular slot extending over at least a part of the circumference of a circle contained within said disc and disposed concentric therewith; and means of feeding said antenna; said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode in which it generates a radiation pattern at low elevation, characterized in that said radiating element has at least one slot allowing the control of the resonance frequency of a chosen higher mode wherein said chosen higher mode is the TM01 mode, the current lines from which are arranged radially.
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6. A flat printed antenna for transmission and/or reception of microwave signals, the antenna comprising:
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a plate of dielectric substrate; an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate; a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate; and means of feeding said antenna; said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation pattern at low elevation, characterized in that said radiating element has at least one slot allowing the control of the resonance frequency of a chosen higher mode, each of said at least one slot having disabling means, and wherein the antenna includes activation/deactivation means for activating and deactivating said disabling means. - View Dependent Claims (7, 8, 9)
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10. A two band antenna comprising:
- a lower antenna and an upper antenna superimposed thereon, each antenna comprising;
a plate of dielectric substrate; an earth plane formed by a first conductor layer deposited on a first face of said plate of dielectric substrate; a radiating element formed by a second conductor layer deposited on a second face of said plate of dielectric substrate; and means of feeding said antenna; said antenna having a fundamental mode, in which it generates a radiation pattern having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode in which it generates a radiation pattern at low elevation, characterized in that said radiating element has at least one slot allowing the control of the resonance frequency of a chosen higher mode, wherein the radiating element of said lower antenna forms the earth plane of said upper antenna.
- a lower antenna and an upper antenna superimposed thereon, each antenna comprising;
Specification