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1. (WO1999014861) ANTENNA SYSTEM AND APPARATUS FOR RADIO-FREQUENCY WIRELESS KEYBOARD

Pub. No.:    WO/1999/014861    International Application No.:    PCT/US1998/019485
Publication Date: Mar 25, 1999 International Filing Date: Sep 17, 1998
IPC: G06F 3/023
H01Q 1/22
H01Q 1/24
H01Q 7/00
Applicants: LOGITECH, INC.
Inventors: SCHNEIDER, Gerhard
LAZZAROTTO, Sergio
TEODORIDIS, Viron
Title: ANTENNA SYSTEM AND APPARATUS FOR RADIO-FREQUENCY WIRELESS KEYBOARD
Abstract:
An antenna system for a radio frequency ('RF') wireless keyboard includes a metallic plate as a part of the antenna system. The metallic plate is located within the wireless keyboard. A RF transmitter is coupled to the metallic plate and an antenna wire which form the antenna loop. The antenna loop may also be directly integrated into the metallic plate by creating a cut-out space in the metallic plate. The antenna system may also include the metallic plate directly coupled with the RF transmitter so that the metallic plate is a whip or dipole antenna. The RF transmitter generates RF signals associated with particular keyswitches of the wireless keyboard. The antenna system transmits the generated RF signals to a RF receiver that resides separately from, and that communicates with, the wireless keyboard.