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A novel design of feeding and short-circuiting an internal patch antenna for mobile phones is presented. The patch antenna comprises a simple rectangular patch that is fed through and short-circuited to a small ground plane (denoted as antenna ground here) which protrudes from the main or bottom ground of a folder-type mobile phone. With the presence of the small antenna ground, which can function as a shielding wall, the proposed antenna can be placed in close proximity to the RF shielding metal box in the mobile phone, with very small effects on the antenna performances. A design example of the proposed antenna for Universal Mobile Telecommunication System (UMTS) (1920∼2170MHz) operation is demonstrated. Experimental and simulated results are presented.
Date of Publication: Oct. 2005