FREQUENCY-TUNEABLE FILTER EMPLOYING A SLIDING SYSTEM

摘要

The invention concerns a frequency-tuneable filter employing a sliding system. The filter comprises: a housing defining a plurality of cavities by means of partition walls; a subsidiary cover which is joined to the upper part of the housing and which is formed with a guide recess; at least one sliding member provided in the guide recess; a main cover which is joined to the upper part of the subsidiary cover; a resonator which is accommodated in the cavity; and at least one tuning element which is joined to the bottom part of the sliding member and which is inserted on the inside of the housing. Tuning is carried out by means of the sliding action of the sliding member, and at least one of the side surfaces of the sliding member is joined to a first guide member which makes contact with the side surface of the guide recess and which guides the sliding action. When the filter is employed, the user can easily perform the tuning operation and the sliding action can be carried out in a more stable fashion, and it is possible to adjust the height of the tuning element for tuning against the resonator thereby ensuring a wide tuning range.