Dual band loop and inverted-F ground edge radiating antenna structure
AssigneeSilicon Laboratories Inc.
InventorsTuomas Hanninen, Attila Zolomy
Life of this patent
Estimating the term…
Abstract
A dual band antenna structure is disclosed. The dual band antenna structure utilizes features from loop ground edge radiating antennas and inverted-F antennas to create an antenna that has two resonance frequencies. The dual band antenna structure includes a loop ground edge radiating antenna, which has a first resonance frequency. A monopole branch is also located at the end of the feeding trace to provide a second resonance frequency. The dual band antenna structure is useful for network devices that operate at multiple frequencies, such as those using the WiFi/BLE/IEEE802.15.4 protocols.
Claims16
A dual band antenna, comprising:
- a printed circuit board having a ground plane on a top layer, wherein the ground plane comprises a conductive material;
- a ground clearance disposed on the top layer, wherein the ground clearance lacks a conductive material;
- a loop ground edge radiating antenna having a feeding trace disposed in the ground clearance, and a loop branch, perpendicular to the feeding trace, that connects an end of the feeding trace to the ground plane, wherein one or more capacitors are located along a path of the loop branch, such that current passing along the loop branch passes through the one or more capacitors;
- and
- a monopole branch extending from the end of the feeding trace in an opposite direction from the loop branch, wherein the monopole branch terminates in the ground clearance.
A dual band antenna, comprising:
- a printed circuit board having a ground plane on a top layer, wherein the ground plane comprises a conductive material;
- a ground clearance disposed on the top layer, wherein the ground clearance is rectangular shaped and lacks a conductive material, wherein one side of the ground clearance is an edge of the printed circuit board and the ground plane extends to the edge of the printed circuit board on a second side and a third side of the ground clearance;
- a feeding trace disposed in the ground clearance, a proximal end of the feeding trace in communication with an input capacitor and a RF feed;
- a T connection disposed at a distal end of the feeding trace, wherein a loop branch extends perpendicular to the feeding trace in one direction and a monopole branch extends perpendicular to the feeding trace in an opposite direction;
- and
- wherein a distal end of the loop branch connects to a the ground plane on the second side of the ground clearance and a distal end of the monopole branch terminates in the ground clearance such that no conductive traces contact the third side of the ground clearance.
Dependencies are inferred from the claim text.