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You can use aireplay-ng from the aircrack-ng suite to deauthenticate each client individually:

Code:

aireplay-ng -0 <num> -a <AP MAC> -c <client MAC> <interface> -0 means "deauthenticate" <num> is the number of deauth packets to send (in most cases, 1 is enough to get the client kicked out) <AP MAC> is the access point's MAC address (also called: BSSID) <client MAC> is the client's (that you want to kick out) MAC address <interface> is the WiFi NIC's name that you want to use (e.g. "wlan0")

You can use airmon-ng to discover all connected clients
To keep those clients out you will, though, have to repeat the deauthentication "infinitely", since they otherwise simply (automatically) reconnect.
This will, at the same time, clutter up your WiFi's channel, and thus effectively lower your available bandwidth.[/code]