Patent ID: 8686810

Claim:
A frequency-tunable filter using a sliding system, the frequency-tunable filter comprising: a housing having a plurality of cavities defined by partitions; a sub-cover coupled to an upper portion of the housing and having a guide groove formed therein, wherein the guide groove has at least one side surface; at least one sliding member installed in the guide groove and movable within the guide groove by a sliding movement; a main cover coupled to an upper portion of the sub-cover; a resonator provided in each of the plurality of cavities; at least one tuning element coupled to a lower portion of the at least one sliding member to be inserted inside the housing; and at least one second guide member coupled to an upper portion of the at least one sliding member, the at least one second guide member configured to guide the at least one sliding member movement by way of contact with a lower portion of the main cover, wherein tuning is achieved by a sliding movement of the at least one sliding member, and at least one first guide member is coupled to at least one side surface of the at least one sliding member, the first guide member configured to guide the at least one sliding movement of the sliding member by way of contact with the at least one side surface of the guide groove.