Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-08-25
2001-04-17
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S831000, C343S846000
Reexamination Certificate
active
06218991
ABSTRACT:
TECHNICAL FIELD
The present invention relates to antennas and more particularly to a compact isotropic planar inverted F antenna.
BACKGROUND ART
Planar inverted F antennas generally include at least one planar radiating element and a ground plane in a plane parallel to the radiating element. A short tab at one end of the radiating element that extends transverse to the radiating element is connected to the ground plane. A coaxial cable extends through the ground plane at a selected location and the center pin of the coaxial cable is connected to the radiating element. This type of antenna is called an inverted F antenna because the side profile is shaped like the letter F with the radiating element forming the long portion, the tab forming top transverse leg and the center pin of the coaxial cable forming the other transverse leg. In prior known planar inverted F antennas, the radiating element is located relatively near the ground plane so that the length of the tab is less than 10% of the length of the radiating element.
Planar inverted F antennas are used in wireless communications. As the number of wireless applications increases and the physical size of wireless devices decreases, antennas for these applications and devices are needed. Prior known planar inverted F antennas have been limited by the required size of the radiating element, the required size of the ground plane, limited bandwidth and limited isotropic characteristics.
DISCLOSURE OF THE INVENTION
A compact planar inverted F antenna having a circuit element and a ground plane is disclosed. The circuit element is conductive sheet, preferably brass, and includes a planar portion with a tab. The tab is narrower than the planar portion and extends perpendicular to the plane of the planar portion from a first edge. The length of the tab is about 25% and greater of the length of the planar portion. The planar portion has a reactance window extending inward from an edge that is adjacent to the first edge. The ground plane includes a substrate, a conductive planar first portion on a first side of the substrate, and conductive planar second and third portions on a second side of the substrate. The second and third portions are connected to the first portion through vias near a first end of the substrate and near a second end opposite the first end, respectively. The second and third portions are separated by a gap extending across the substrate parallel to the first end. The tab of the circuit element is soldered to the first portion of the ground plane. A feed pro is soldered to the circuit element and to a plated pad on the first portion of the ground plane.
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Le Hoang-anh
Lewis, Jr. Ancel W.
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