Abstract: A pin-hole detection device includes: a film supply unit provided with a roller on which the film is wound; a base part disposed adjacent to the film supply unit, seated on a ground, and formed by connecting a plurality of profiles; a light emitting unit mounted on the base part and emitting light; a film unwinding unit mounted on the base part, configured to unwind the film provided from the film supply unit, and allow the unwounded film to pass through the light emitting unit while being unfolded; and a luminous intensity measuring unit mounted on the base part and disposed to face the light emitting unit to measure the luminous intensity of light passing through the unfolded film, wherein the film unwinding unit includes a winder roller unit rotating and moving the film in one direction while compressing the film, and an idle roller unit rotated according to movement of the contacted film and configured to guide the unwound film to determine a movement path.

Abstract: A dielectric filter stopping a frequency signal at a lower frequency band than a pass band as a reference band with a higher attenuation ratio to perform adjustment of the attenuation ratio even the lower frequency area. The dielectric filter comprises a predetermined conductive pattern on the front surface on a dielectric block in which a plurality of resonant holes are provided, the dielectric block including back and side surfaces covered with a conductive material, each resonant hole being covered with the conductive material in the internal surface, the predetermined conductive pattern being separated at a predetermined distance from the end portions of the resonant holes, whereby the predetermined conductive pattern forms a coupling capacitance between the adjacent resonators and a cross coupling capacitance between the resonators not adjacent to control an electromagnetic coupling over the whole dielectric filter.

Abstract: A duplexer dielectric filter comprises a dielectric block, a first filtering area including resonators having resonant holes disposed to pass through first and second surfaces of the dielectric block in a substantially parallel manner, a second filtering area including resonators having resonant holes disposed to pass through the first and second surfaces of the dielectric block in a parallel manner; first conductive pattern formed on the surroundings of the resonant holes of the first surface, thus to be connected with the conductive material covered with the interior of the resonant holes and for applying a loading capacitance to the resonators and an electromagnetic coupling between adjacent resonators, a second conductive pattern disposed on the first surface of the first filtering area along the arrangement direction of the resonant hole and for forming the electromagnetic coupling between the adjacent resonators, third conductive pattern disposed on the first surface of the first filtering area for form