Planar antenna for vehicles
First Claim
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1. A planar antenna for a vehicle comprising:
- a dielectric substrate;
an antenna including a radiating conductor and a grounding conductor arranged on both sides of said dielectric substrate to oppose each other, said antenna being mounted on a surface of a vehicle;
at least one feeder connected to a feeding position of said radiating conductor suitable for excitation; and
means for exciting through said feeder said antenna substantially at a resonance frequency of a higher-order resonance mode higher than that of a primary resonance mode;
said antenna being a microstrip antenna having said dielectric substrate formed in a rectangular plate, said radiating conductor formed in a circular plate mounted in a partial area on the side surface of said dielectric substrate and said grounding conductor mounted entirely on the opposite side surface of said dielectric substrate;
said microstrip antenna being excited in a higher-order excitation mode at a resonant frequency fnm given as follows with a constant α
nm inherent to the mode, thickness h and dielectric constant ε
of said dielectric substrate and radius a of said circular plate;
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Abstract
At least one microstrip antenna comprising a radiating conductor and a grounding conductor arranged on both sides of a dielectric substrate is mounted on a roof surface of an automobile. One or more feeders are each connected to a feeding position of the radiating conductor to excite the antenna in a higher-order mode.
21 Citations
6 Claims
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1. A planar antenna for a vehicle comprising:
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a dielectric substrate; an antenna including a radiating conductor and a grounding conductor arranged on both sides of said dielectric substrate to oppose each other, said antenna being mounted on a surface of a vehicle; at least one feeder connected to a feeding position of said radiating conductor suitable for excitation; and means for exciting through said feeder said antenna substantially at a resonance frequency of a higher-order resonance mode higher than that of a primary resonance mode; said antenna being a microstrip antenna having said dielectric substrate formed in a rectangular plate, said radiating conductor formed in a circular plate mounted in a partial area on the side surface of said dielectric substrate and said grounding conductor mounted entirely on the opposite side surface of said dielectric substrate; said microstrip antenna being excited in a higher-order excitation mode at a resonant frequency fnm given as follows with a constant α
nm inherent to the mode, thickness h and dielectric constant ε
of said dielectric substrate and radius a of said circular plate;
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Specification