Abstract: A secondary battery having improved impact resistance is provided. The secondary battery includes a battery case comprising an electrode assembly and an electrolyte accommodated in an accommodation part of the battery case. The secondary battery satisfies following Equation (1): Equation (1): W/S?42. In Equation (1), W is an amount of electrolyte per unit capacity of the secondary battery [unit: g/Ah], and S is a product of a total length [unit: m] and a full width [unit: m] of the electrode assembly.

Abstract: A stacked coaxial cavity radio frequency power combiner is disclosed that includes: an outer conductor in which a cavity is formed in an axial direction; a plurality of amplifier modules, including an input coupler that surrounds the device main body, each amplifier module is spaced apart from each other on the outer wall of the device main body, stacked, and disposed radially and orthogonally to the central axis of the cavity; an inner conductor configured to stack and spaced apart by a predetermined inner gap in the central axial direction in the cavity of the device main body and include a plurality of inner conductor blocks disposed corresponding to each layer of the amplifier module; at least one inner insulating support located between the plurality of inner conductor blocks; and an output coupler provided at one side of the device main body and extended outside of the device main body.

Abstract: Disclosed is a radio frequency power amplifier module. The radio frequency power amplifier module according to an embodiment of the disclosed technology includes a module main body one or more amplifier semiconductors installed inside the module main body, and a coupler electrically connected to the amplifier semiconductor and protruding and extending to the outside of the module main body to transmit electromagnetic waves.

Abstract: An internal antenna having a wideband characteristic includes a printed circuit board, a first antenna unit fed with electricity from a feeding unit of the printed circuit board, and a second antenna unit spaced apart from the first antenna unit by a predetermined distance and indirectly fed with electricity by means of coupling to the first antenna unit, wherein the second antenna unit is indirectly fed with electricity with a phase difference from the first antenna unit due to an electric distance from a feeding point of the first antenna unit.

Abstract: An internal antenna having a wideband characteristic includes a printed circuit board, a first antenna unit fed with electricity from a feeding unit of the printed circuit board, and a second antenna unit spaced apart from the first antenna unit by a predetermined distance and indirectly fed with electricity by means of coupling to the first antenna unit, wherein the second antenna unit is indirectly fed with electricity with a phase difference from the first antenna unit due to an electric distance from a feeding point of the first antenna unit.

Abstract: Disclosed is a MIMO/diversity antenna high isolation including a printed circuit board, a plurality of antenna elements, a current conversion element connected with a common ground of the printed circuit board apart from the antenna elements at a predetermined distance, wherein the current conversion element is coupled with the antenna elements to induce an electric current from the antenna elements into the antenna elements again via the common ground.