Abstract: A band-trap filter includes a main body, an outer electrode, inner electrodes, strip-shaped wires, a signal input, a signal output, and a circuit board. The main body is made of a dielectric material with the outer electrode coating top, bottom, right, left, and rear sides thereof. The inner electrodes are provided inside the main body. The signal input and output are provided on the top side of the main body to electrically connect to the inner electrodes via the strip-shaped wires on the front side of the main body. Another strip-shaped wire electrically connects portions of the outer electrode at the top and the bottom side of the main body. Due to inductance and capacitance effects, the band-trap filter provides functions of both low-pass and high-pass filters and good electromagnetic interference rejection effect.

Abstract: A garbage disposal system for household garbage which includes a crushing and shearing unit for the process to separate the liquid from the solid and to shear the solid into refuse strips, a screw friction machine to supply the heat source for a scrap metal recovery unit to collect scrap metal from refuse strips, a drying and a high-temperature heating process to heat refuse strips into dry state, a compressing process to compress refuse strips into refuse blocks, and a cement blocking process to make refuse blocks into caissons for sea water concrete or tidal land construction. Waste liquid filter and waste gas filter are used to filtrate impurities from waste liquid or gas.