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A novel ultra-wideband (UWB) bandpass filter (BPF) using three multi-mode resonator (MMR) units in series is proposed in this paper. Each of the units is a resonator made by attaching a ring open stub in shunt to a high impedance microstrip line. The units form a MMR to improve the selectivity. By properly adjusting the radius of the circles of the ring stubs and the length of the coupling segments,...
Real-time video monitoring is necessary for remote control mining while real-time positioning of underground equipments is also necessary for unmanned mining. In this paper, a new pattern combining WLAN with ZigBee is proposed to solute the two problems above. In the pattern, RSSI(Received Signal Strength Indication) values of ZigBee anchor nodes are used to calculate the position and posture of underground...
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