Patent ID: 6662028
Filing Date: 2003-12-09
Classification: H01Q

Abstract:
A multi-frequency inverted-F antenna, comprising:a linear conductive element having opposite first and second sides, wherein the linear conductive element extends along a longitudinal direction; a first feed electrically connected to the linear conductive element and to ground and that extends outwardly from the linear conductive element first side at a first location; a second feed electrically connected to the linear conductive element and extending outwardly from the linear conductive element first side at a second location, wherein the second location is spaced-apart from the first location along the longitudinal direction; a switch electrically connected to the second feed and configured to selectively connect the second feed to ground or to a receiver that receives wireless communications signals or to a transmitter that transmits wireless communications signals or to maintain the second feed in an open circuit; a third feed electrically connected to the linear conductive element and extending outwardly from the linear conductive element first side at a third location, wherein the third location is spaced-apart from the first and second locations along the longitudinal direction; and a switch electrically connected to the third feed and configured to selectively connect the third feed to ground or to the receiver or to the transmitter or to maintain the third feed in an open circuit; wherein the antenna radiates in a first frequency band when the first feed is connected to ground, when the second feed is electrically connected to the receiver or to the transmitter, and when the third feed switch is open; and wherein the antenna radiates in a second frequency band different than the first frequency band when the first and second feeds are electrically connected to ground, and when the third feed switch electrically connects the third feed to the receiver or to the transmitter.