Aperture-coupled planar inverted-F antenna
First Claim
1. An antenna comprising:
- a ground plane having an aperture formed therein;
a radiating patch formed on one side of the ground plane and separated therefrom by a first dielectric;
a feedline arranged on an opposite side of the ground plane and separated therefrom by a second dielectric, such that signals are coupled between the feedline and the radiating patch via the aperture; and
a single shorting strip located proximate to an edge of the radiating patch, away from a corner of the edge, and connecting the radiating patch to the ground plane, such that a dimension of the radiating patch required for resonance is reduced by a factor of approximately one-half, and wherein a position of the shorting strip along the edge of the radiating patch is selected to alter a characteristic of a radiation pattern of the antenna.
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Accused Products
Abstract
An aperture-coupled planar inverted-F antenna (PIFA) including a radiating patch formed on one side of a ground plane and separated therefrom by a first dielectric which may be air, foam or another suitable material. A shorting strip connects a side of the radiating patch to the ground plane at a point corresponding to a dominant mode null, such that the size of the radiating patch may be reduced by a factor of two. A microstrip feedline is arranged on an opposite side of the ground plane and separated therefrom by a second dielectric which may be part of a substrate formed of printed wiring board material. Signals are coupled between the microstrip feedline and the radiating patch via an aperture formed in the ground plane. The use of aperture coupling avoids the excessive cost associated with conventional TEM transmission line or coaxial feeds, while providing improved manufacturability and ease of integration relative to PIFAs with conventional feeds. Moreover, the aperture coupling provides improved tuning flexibility. For example, a portion of the microstrip feedline may be used as a tuning stub to provide impedance matching on the feedline.
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Citations
24 Claims
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1. An antenna comprising:
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a ground plane having an aperture formed therein; a radiating patch formed on one side of the ground plane and separated therefrom by a first dielectric; a feedline arranged on an opposite side of the ground plane and separated therefrom by a second dielectric, such that signals are coupled between the feedline and the radiating patch via the aperture; and a single shorting strip located proximate to an edge of the radiating patch, away from a corner of the edge, and connecting the radiating patch to the ground plane, such that a dimension of the radiating patch required for resonance is reduced by a factor of approximately one-half, and wherein a position of the shorting strip along the edge of the radiating patch is selected to alter a characteristic of a radiation pattern of the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A signal directing method for use in an antenna, the method comprising the steps of:
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arranging a radiating patch of the antenna on one side of a ground plane having an aperture formed therein, such that the radiating patch is separated from the ground plane by a first dielectric; arranging a feedline on an opposite side of the ground plane such that the feedline is separated from the ground plane by a second dielectric and signals may be coupled between the feedline and the radiating patch via the aperture; and connecting the radiating patch to the ground plane via a single shorting strip proximate to an edge of the radiating patch and away from a corner of the edge, such that a dimension of the radiating patch required for resonance is reduced by a factor of approximately one-half, and wherein a position of the shorting strip along the edge of the radiating patch is selected to alter a characteristic of a radiation pattern of the antenna. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification