Abstract: Electronic device includes first wireless communication interface; second wireless communication interface; and controller.

Abstract: The present invention relates to a time-division duplex (TDD) antenna apparatus which can reduce signal loss, and thereby minimize the noise figure (NF) of a system and extend uplink coverage of the system, by separating a transmitter circuit from a receiver circuit of the antenna apparatus, and disposing a low noise amplifier (LNA) of the receiver circuit between a reception antenna and a reception filter of the receiver. A time-division duplex antenna apparatus according to an embodiment of the present invention includes: a transmitter which includes at least one transmission antenna module and transmits a downlink signal through a first path; a receiver which includes at least one reception antenna module and receives an uplink signal through a second path that is separated from the first path without any overlapping portions thereof; and a controller which controls the transmitter and the receiver in a time-division duplex manner.

Abstract: In various embodiments, an antenna array may comprise a dielectric; a first patch antenna disposed on a first region of the dielectric; a second patch antenna disposed on a second region of the dielectric; and a ground layer including a first sub-ground layer in contact with a lower portion of the first region of the dielectric, a third sub-ground layer in contact with a lower portion of the second region of the dielectric, and a second sub-ground layer spaced apart from a lower portion between the first region and the second region of the dielectric.

Abstract: A helmet shield coupled to a front opening of a helmet includes a lens unit provided to face a front of the front opening; a frame unit provided along a circumference of the lens unit; and a ventilation unit provided at both sides of the lens unit for communication between an inside and an outside of the helmet shield.

Abstract: An opening/closing apparatus capable of manipulating a sun visor, which is opened and closed at a front side of a front opening of a helmet main body, from a top portion of the helmet is provided. The opening/closing apparatus includes a sliding member in which its one end portion is coupled to a central top end portion of the sun visor, and a grip helping the sliding member to move forwards and backwards is formed at another end portion, a guide holder that is attached to an inner top portion of the helmet main body and guides a forward and a backward movement of the sliding member, and a damper that is a saw-toothed member and is attached to one side of the guide holder.

Abstract: Provided is a helmet including a half helmet-shaped helmet main body including a main body through hole at each side thereof; a shield that is rotated vertically at a front side of the helmet main body and inserted into the helmet main body and has a through hole at each end thereof so as to be detachably connected to the helmet main body; and a holder having a penetrating connection shaft at its lower surface, the penetrating connection shaft capable of being inserted through the main body through hole and the shield through hole from the outside of the helmet main body and connecting the shield to the helmet main body so as to be rotated vertically.

Abstract: A helmet shield coupled to a front opening of a helmet includes a lens unit provided to face a front of the front opening; a frame unit provided along a circumference of the lens unit; and a ventilation unit provided at both sides of the lens unit for communication between an inside and an outside of the helmet shield.

Abstract: Provided is an opening/closing apparatus allowing a sun visor to be readily opened and closed with a helmet on as well as maintaining an opening/closing speed of the sun visor to be constant and a helmet including the same.

Abstract: Provided is a helmet including a half helmet-shaped helmet main body including a main body through hole at each side thereof; a shield that is rotated vertically at a front side of the helmet main body and inserted into the helmet main body and has a through hole at each end thereof so as to be detachably connected to the helmet main body; and a holder having a penetrating connection shaft at its lower surface, the penetrating connection shaft capable of being inserted through the main body through hole and the shield through hole from the outside of the helmet main body and connecting the shield to the helmet main body so as to be rotated vertically.

Abstract: A device for opening-closing sun visor of a helmet is disclosed. The device comprises a helmet body 10 provided in front with an opening portion 11 for the face and having a pair of hinge shafts 12 protruded on both the left and right sides, a sun visor 20 having a visor portion 21 placed on the side of the opening portion 11 of the helmet body 10, extending portions 22 extended to the left and right sides of the visor portion 21, and hinge slots 23 formed at the ends of the extending portions 22; and an opening-closing mechanism 30 having a slider 31 connected to the top center of the visor portion 21 of the sun visor 20, a guide rail 32 which is attached to the ceiling of the helmet body 10, and a guide holder 35 which is attached lengthwise to the top center of the helmet body.

Abstract: A device for opening-closing jaw guard of a helmet is disclosed. The device has a hinge means 400 comprising fixed plates 410 which are fixed on both the left and right sides of the helmet body 1 and each of which has a long hole 411, operating plates 420 which are fixed on the inside of the left and right extending portions 4a of the jaw guard 4 and each of which has an arc-shaped internal gear 421, a planetary gear 430 which is engaged with the internal gear 421 of the operating plate 420, and has a protuberance 431 formed on either side, and a cutaway portion 432 formed on the outer circumference; and a pivoting lever 440 which has a shaft protuberance 441 of front end inserted into the cutaway portion 432 of the planetary gear 430 and a penetration hole 442 of rear end inserted into the main boss 423 of the operating plate 420.

Abstract: A device for opening-closing sun visor of a helmet is disclosed. The device comprises a helmet body 10 provided in front with an opening portion 11 for the face and having a pair of hinge shafts 12 protruded on both the left and right sides, a sun visor 20 having a visor portion 21 placed on the side of the opening portion 11 of the helmet body 10, extending portions 22 extended to the left and right sides of the visor portion 21, and hinge slots 23 formed at the ends of the extending portions 22; and an opening-closing mechanism 30 having a slider 31 connected to the top center of the visor portion 21 of the sun visor 20, a guide rail 32 which is attached to the ceiling of the helmet body 10, and a guide holder 35 which is attached lengthwise to the top center of the helmet body.

Abstract: A device for opening-closing jaw guard of a helmet is disclosed. The device has a hinge means 400 comprising fixed plates 410 which are fixed on both the left and right sides of the helmet body 1 and each of which has a long hole 411, operating plates 420 which are fixed on the inside of the left and right extending portions 4a of the jaw guard 4 and each of which has an arc-shaped internal gear 421, a planetary gear 430 which is engaged with the internal gear 421 of the operating plate 420, and has a protuberance 431 formed on either side, and a cutaway portion 432 formed on the outer circumference; and a pivoting lever 440 which has a shaft protuberance 441 of front end inserted into the cutaway portion 432 of the planetary gear 430 and a penetration hole 442 of rear end inserted into the main boss 423 of the operating plate 420.