A conductive layer is formed on each of the upper and lower surfaces of a dielectric substrate, and the two conductive layers are connected by rows of via-holes that are formed which a spacing that is less than or equal to \xbd of the wavelength in the dielectric substrate in the resonance frequency, whereby n stages of dielectric resonators and inputoutput waveguide structures are formed. The polyethylene has a long-chain-branching index of 1 or greaster. The linear cyclodextrin copolymer and linear oxidized cyclodextrin copolymer of the invention may be used as a delivery vehicle of various therapeutic agents. Also, plural sheets of trays are energized by spring members to be put elastically between them in the thickness direction. This allows the group of motorcycles to continue riding, and the disabled motorcycle can be towed to a repair location at a more convenient time for the entire group of riders.