Abstract: An antenna for enhancing characteristic of a beam with reducing PIMD is disclosed. The antenna includes a reflection plate, at least one first choke member disposed on one side of the reflection plate, an insulated member disposed between the reflection plate and the first choke member, thereby separating the first choke member from the reflection plate, wherein the insulated member is an insulator, and a connection member configured to connect electrically the first choke member to the reflection plate through the insulated member, wherein the connection member is a conductor.

Abstract: A phase shifter for reducing a loss by friction, etc by combining a rotation member with a guide member is disclosed. The phase shifter includes a rotation member, a first rotation axis member combined with the rotation member in a direction crossing over the rotation member, a first guide member combined with the first rotation axis member, and configured to rotate in accordance with rotation of the first rotation axis member, and a first power delivering member configured to connect at least one of the rotation member and the first rotation axis member to the first guide member.

Abstract: An apparatus for adjusting an inclination angle of an antenna using a rotatory power is disclosed, wherein a remote control unit is easily combined with the apparatus. The apparatus in an antenna having a phase shifter includes a power delivering member connected to the phase shifter, and a driving member combined with the power delivering member, and for providing a power to the power delivering member. Here, an inserting section is formed at a part of outside surfaces of the driving member, a remote control unit is inserted into the inserting section and rotates the driving member, and the power delivering member rotates in response to the power provided from the driving member. Accordingly, any given member is not removed when the remote control unit is combined with the apparatus. As a result, the remote control unit may be easily combined with the apparatus, and any member is not lost.

Abstract: An antenna for enhancing characteristic of a beam with reducing PIMD is disclosed. The antenna includes a reflection plate, at least one first choke member disposed on one side of the reflection plate, an insulated member disposed between the reflection plate and the first choke member, thereby separating the first choke member from the reflection plate, wherein the insulated member is an insulator, and a connection member configured to connect electrically the first choke member to the reflection plate through the insulated member, wherein the connection member is a conductor.

Abstract: Disclosed is a wideband directional antenna in a wireless communication service, comprising at least one radiation element, wherein the radiation element includes at least one loop, wherein one feeding point of the loop is connected to feeder and the other feeding point is connected to a ground distributor.

Abstract: A multi-band patch antenna includes a feeding unit for feeding signals, a skeleton slot radiation element for radiating radio waves, wherein the skeleton slot radiation element includes a feeding point connected to the feeding unit, first conductive loops symmetrically formed with the feeding point in the center and second conductive loops formed at the both sides of the first loops, and a reflector for reflecting backward radiation waves of the skeleton slot radiation element.