Abstract: An omni-directional MIMO antenna comprises: a board; a first feed line and a second feed line formed on the board and spaced apart from each other; a first radiator receiving a feed signal from the first feed line; a second radiator receiving a feed signal from the second feed line; a first ground pattern that surrounds the first feed line, is electrically connected to a ground, and extends in a longitudinal direction of the board; a second ground pattern that surrounds the second feed line, is electrically connected to a ground, and extends in a longitudinal direction of the board; a parasitic patch formed on a rear surface of the board; a first feed point formed on the rear surface and providing a feed signal to the first feed line and a second feed point formed on the rear surface and providing a feed signal to the second feed line.

Abstract: An omni-directional MIMO antenna comprises: a board; a first feed line and a second feed line formed on the board and spaced apart from each other; a first radiator receiving a feed signal from the first feed line; a second radiator receiving a feed signal from the second feed line; a first ground pattern that surrounds the first feed line, is electrically connected to a ground, and extends in a longitudinal direction of the board; a second ground pattern that surrounds the second feed line, is electrically connected to a ground, and extends in a longitudinal direction of the board; a parasitic patch formed on a rear surface of the board; a first feed point formed on the rear surface and providing a feed signal to the first feed line and a second feed point formed on the rear surface and providing a feed signal to the second feed line.

Abstract: An RF cavity filter is disclosed. The disclosed filter includes: a housing in which there is at least one cavity formed; a cover joined to an upper portion of the housing; at least one bolt inserted through at least one through hole formed in the cover; and at least one elastic element attached to the cover in an area below the through hole, where the bolt is inserted through the through hole to provide an external force on the elastic element, and the external force alters the shape of the elastic element. With the disclosed filter, pieces of metal debris created during tuning can be prevented from reaching the inside of the filter, and the degradation in the PIMD performance that would have otherwise occurred due to the pieces of debris can be avoided. Also, the filter can maintain a tuned state without the use of separate nuts.

Abstract: An RF cavity filter is disclosed. The disclosed filter includes: a housing in which there is at least one cavity formed; a cover joined to an upper portion of the housing; at least one bolt inserted through at least one through hole formed in the cover; and at least one elastic element attached to the cover in an area below the through hole, where the bolt is inserted through the through hole to provide an external force on the elastic element, and the external force alters the shape of the elastic element. With the disclosed filter, pieces of metal debris created during tuning can be prevented from reaching the inside of the filter, and the degradation in the PIMD performance that would have otherwise occurred due to the pieces of debris can be avoided. Also, the filter can maintain a tuned state without the use of separate nuts.