A Quad Beam Variable Height Antenna System for Reliable Underground Mine Tunnel Communications

Mine accidents can damage the wired backbone supporting underground wireless networks, forcing rescue teams to deploy temporary mesh nodes to maintain communication with the surface. Although higher carrier frequencies can support bandwidth-intensive applications such as live video, multimode propagation within mine tunnels produces severe, spatially localized fading. Movable antennas can mitigate these fades by adjusting antenna position; however, moving all antennas on a multi-link relay node simultaneously may improve one link at the expense of another. This paper introduces QuadBeam, a compact mesh node antenna system comprising four independently positionable 2.4 GHz patch antennas mounted on the side faces of a central hub, together with a 900 MHz monopole for backup voice communication. A preliminary prototype incorporates one motor-driven patch mount and three manually adjustable mounts. Bench measurements show interelement coupling below-46 dB between patches on adjacent faces. Measurements at five carrier frequencies from 2.40 GHz to 2.48 GHz in the Edgar Experimental Mine reveal 19 dB to 26 dB received-power variations across transmitter and receiver separations of 8.3 m to 18.3 m. Adjusting the receiver height over approximately 20 cm yields received-power improvements of up to 22 dB. Repositioning neighboring patches and removing or reinstalling the monopole produce no noticeable change in the active link. These results demonstrate the potential of independently positioned antennas to alleviate spatial fading in underground mesh communications.