A mobile device comprises multiple receive antennas to receive spatially independent multipath signals from multiple transmit antennas located on a single base station. The honeycomb structure 1 has a plurality of partition walls 2 partitioning a plurality of cells 3 extending in an axial direction. The crystal oscillator also has an adjustable capacitive assembly having selectable capacitances which is connected parallel to a combined capacitor comprising the first and the second oscillating capacitors. The peaked load stage receives the differential output current from the mixer stage and provides increasing impedance at a specified frequency of operation. The viscous vibration-damping wall is connected to an upper-floor girder by directly connecting a gusset plate fixed to the upper-floor girder and an intermediate plate of the viscous vibration-damping wall.