Inventors:
Li Chen - Buffalo Grove IL
Enrico J. DiMario - Chicago IL
Eric Krenz - Crystal Lake IL
Roger Jellicoe - Woodstock IL
Richard Huang - Bloomingale IL
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H01Q 124
Abstract:
A telescoping antenna ( ) has a mast element ( ) with first and second ends ( ), the first end ( ) being mounted on a cellular telephone housing ( ) and establishing electrical connection with signal processing circuitry ( ) within the cellular telephone ( ). The telescoping antenna ( ) also has a cylindrical radiating element ( ) that slidably engages the mast element ( ). In a retracted or stowed position first ends ( ) of the mast element ( ) and the cylindrical radiating element ( ) are substantially adjacent, and second ends ( ) of the mast element ( ) and the cylindrical radiating element ( ) are also substantially adjacent. A loading coil ( ) has a first end ( ) permanently connected to the second end ( ) of the cylindrical radiating element ( ) and has a second end ( ) engageable with the second end ( ) of the mast element ( ). The loading coil ( ) engages the mast element ( ) when the antenna ( ) is in a stowed position, and is disconnected from the mast element ( ) when the antenna ( ) is in the deployed position. The antenna ( ) provides a substantially constant frequency of operation in both an extended and retracted orientation.