BANDPASS FILTER Russian patent published in 2005 - IPC

FIELD: electronic engineering.

SUBSTANCE: proposed filter has dielectric block in the form of rectangular parallelepiped whose five of six faces carry external metallization layer. Provided between sixth face and that disposed in opposition are n holes, where n is number of filter sections. Internal metallization layer is disposed on surfaces of n holes which is connected with external one. Sixth face of block carries m conducting pads disposed above holes and connected to internal metallization layer. Number of conducting pads m equals that of sections n. Pads are isolated from each other and from metallization layer by means of insulating gaps. Contact conductors are disposed on sixth face of block and isolated from conducting pads and from external metallization layer by insulating gaps. One of m conducting pads may have single insulating slit one of whose ends is aligned either with gap between pads and metallization layer or with gap between conducting pads. Energy input and output is effected in filter-transfer-line system upon connection of conductors to microwave mode propagating circuit. Filter constitutes resonance-tuned sections formed by holes in dielectric block, by metallization layer on five of six faces of block, and by metallization layer on surfaces of holes, as well as by pads on block face. Energy is effectively transferred from filter input to its output only in frequency band close to center frequency due to electromagnetic coupling between resonance-tunes sections of filter.

EFFECT: enhanced rejection factor at fixed frequencies in attenuation band at same size of filter.

3 cl, 4 dwg