Patent ID: 9142875
Filing Date: 2015-09-22
Classification: H01Q

Abstract:
1. An antenna comprising: a linear array antenna unit configured to include a plurality of cable elements linearly arranged so as to extend linearly with respect to one another, wherein each of the plurality of cable elements is electrically coupled to adjacent cable elements; a first switch having one end coupled to a ground and another end coupled to at least one cable element of the plurality of cable elements of the linear array antenna unit, and configured to perform a switching operation to connect or disconnect the ground with the at least one cable element of the plurality of cable element according to an operation mode; and a second switch having one end coupled to a power feed point and another end coupled to the at least one cable element of the plurality of cable elements, and configured to perform a switching operation to connect or disconnect the power feed point with the at least one cable element of the plurality of cable elements according to the operation mode, wherein the plurality of cable elements of the linear array antenna unit forms one of a first antenna structure and a second antenna structure according to the switching operations of the first and second switches, wherein each one of cable elements includes an external conductor formed in a shape of a hollow cylinder having an inside wall formed around and along a center axis and an internal conductor positioned inside the external conductor along the center axis and separated from the inside wall of the external conductor within a predetermined distance, and wherein an external conductor of an N