Patent ID: 6172653
Filing Date: 2001-01-09
Classification: H01Q

Abstract:
A mobile satellite communication antenna comprising:a disk-like antenna board including a plurality of antenna elements;a ring-like rotary member provided with the antenna board fixed thereto as an upper lid, wherein the rotary member includes a gear part at its outer circumferential surface, having an annular protrusion protruded from the outer circumferential surface in a radial outward direction below an outer circumferential surface formed at the gear part, and the antenna board having its circumferential end edge protruded from the outer circumferential surface formed at the gear part in the radial outward direction;a flat plate holding the rotary member rotatably, wherein the flat plate includes a plurality of pulleys spaced apart by a predetermined distance in a circumferential direction of the rotary member and rotatable arranged, the annular protrusion of the rotary member engaged with grooves of the pulleys and rotatably holding the rotary member;a drive gear arranged at the flat plate; anda toothed endless belt wound around the gear part of the rotary member and the drive gear for rotating the rotary member and the antenna board, wherein the belt is prevented from coming off of the circumferential end edge of the antenna board and the annular protrusion of the rotary member.