Table ceated on activation, but no prefix.. !

1 : the table is created but no prefix : Linkificator_plugin but not wp_Linkificator_plugin
2 : LINK_deactivate doen’t work..

if you have an idea ?
thanks a lot

// DEFINE WP_LINK_TABLE = LINKIFICATOR_PLUGIN
define("WP_LINK_TABLE", $wpdb->prefix . "Linkificator_plugin");

// CALLBACK FUNCTION ACTIVATION & CREATION TABLE
function LINK_activation()
{
    global $wpdb;

    if($wpdb->get_var("show tables like '". WP_LINK_TABLE . "'") != WP_LINK_TABLE)
    {
        $wpdb->query(
            "CREATE TABLE IF NOT EXISTS '". WP_LINK_TABLE . "</code> (
              'id' int(20) NOT NULL auto_increment,
              'link' text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
              PRIMARY KEY  ('id') )
            ");
        $sSql = "INSERT INTO '". WP_LINK_TABLE . "' ('link')";
        $sSql = $sSql . "VALUES ('Les liens morts apparaitront ici.');";
        $wpdb->query($sSql);
    }
}

// CALLBACK DESACTIVATE & DELETING TABLE
function LINK_deactivate() {
    global $wpdb;
    $wpdb->query("DROP TABLE IF EXISTS '". WP_LINK_TABLE . "' ");
}

// REGISTRE HOOKS
register_activation_hook(__FILE__, 'LINK_activation');
register_deactivation_hook( __FILE__, 'LINK_deactivate' );
register_uninstall_hook( __FILE__, 'LINK_deactivate' );