| CPC H01P 1/2053 (2013.01) [H01Q 1/50 (2013.01); H01Q 21/06 (2013.01); H01Q 1/246 (2013.01); H01Q 21/28 (2013.01)] | 17 Claims |

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1. A radio frequency (RF) filter in a wireless communication system, the RF filter comprising:
a structure comprising a resonance unit; and
a cover plate at which a tuning structure is formed,
wherein the tuning structure is disposed in at least a partial region of an opening in the cover plate, and
wherein the tuning structure comprises is configured to move up and down in respect to the cover plate through the opening in the cover plate.
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