Abstract: A mobile debris collection machine with an improved filter system includes a chassis, wheels for supporting the chassis, a debris collection device on the chassis, a debris container on the chassis, and a vacuum system on the chassis for moving dust and debris from the debris collector to the container. The vacuum system includes a dust and debris inlet, a vacuum fan, a dust and debris conduit extending from the inlet to a deflector which directs dust and debris from the inlet toward an area adjacent the vacuum chamber which is positioned above the debris container. There is a first filter stage upstream of the vacuum fan and attached thereto for rotation with the fan. There are a plurality of second filter stages, each downstream of the vacuum fan with the air flow from the vacuum fan being generally equally divided between the plurality of second filter stages. There is an air outlet for each second filter stage and a diffuser mounted in connection with each air outlet.

Abstract: A loop directive antenna having improved front-to-back ratio and gain for given input power levels assembly for a hand-held radio frequency transceiver, such as a cellular telephone or PCS device operating in the 800-900 or 1850-1990 MHz. frequency ranges, respectively, is provided by the present invention. The loop directive antenna assembly consists of a main loop antenna conductor disposed upon a dielectric element. The main loop antenna conductor and dielectric element are maintained a predetermined distance away from a ground plane, which may be the circuit board or other conductive element. The main loop antenna conductor may include a variety of feedpoint orientations to provide alternative polarizations of the transmitted signal. The ground plane may be a portion of the printed circuit board of the device, a conductive part of the device housing, the battery pack of the device, or a separate conductive panel.