Inverted F antenna system and RFID device having same
First Claim
1. An RFID device, comprising:
- a substrate;
a first active portion of a first inverted F antenna extending along a topside of the substrate;
a first feed electrically coupled to the first active portion;
a second active portion of a second inverted F antenna extending along an underside of the substrate such that the first active portion of the first inverted F antenna and the second active portion of the second inverted F antenna lie along parallel but spaced apart planes, wherein the second active portion of the second inverted F antenna is arranged in an opposite orientation relative to an orientation of the first active portion of the first inverted F antenna, such that the second active portion is rotated about 180 degrees from the orientation of the first active portion relative to a central axis perpendicular to a face of the substrate;
a second feed electrically coupled to the second active portion;
a ground plane spaced from the active portions;
an RFID controller coupled to the feeds; and
a battery coupled to the RFID controller, wherein the battery is positioned between the active portions of the inverted F antennas and the ground plane, such that the active portions of the inverted F antennas are on a first side of the battery and the ground plane is on a second side of the battery that is opposite of the first side.
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Accused Products
Abstract
An RFID device according to one embodiment includes an active portion of a first inverted F antenna; a feed electrically coupled to the active portion; an active portion of a second inverted F antenna, a feed electrically coupled to the second active portion; a ground plane spaced from the active portions; and an RFID controller coupled to the feeds. An RFID device according to another embodiment includes an inverted F antenna having an active portion, a ground plane spaced from the active portion, and a feed coupled to the active portion, wherein the active portion includes multiple aims, a first of the arms having a first length and a second of the arms having a second length; and an RFID controller coupled to the feed.
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Citations
7 Claims
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1. An RFID device, comprising:
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a substrate; a first active portion of a first inverted F antenna extending along a topside of the substrate; a first feed electrically coupled to the first active portion; a second active portion of a second inverted F antenna extending along an underside of the substrate such that the first active portion of the first inverted F antenna and the second active portion of the second inverted F antenna lie along parallel but spaced apart planes, wherein the second active portion of the second inverted F antenna is arranged in an opposite orientation relative to an orientation of the first active portion of the first inverted F antenna, such that the second active portion is rotated about 180 degrees from the orientation of the first active portion relative to a central axis perpendicular to a face of the substrate; a second feed electrically coupled to the second active portion; a ground plane spaced from the active portions; an RFID controller coupled to the feeds; and a battery coupled to the RFID controller, wherein the battery is positioned between the active portions of the inverted F antennas and the ground plane, such that the active portions of the inverted F antennas are on a first side of the battery and the ground plane is on a second side of the battery that is opposite of the first side. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification