Patent ID: 8378894
Filing Date: 2013-02-19
Classification: H01Q

Abstract:
1. A planar antenna device, comprising: a dielectric layer; and an upper and a lower conductor layer that vertically sandwich the dielectric layer, wherein the lower conductor layer is used as a ground, wherein the upper conductor layer forms a single radiating element having a structure in which five or more radiating element pieces are connected to a feeder line, a beginning portion of each of the radiating element pieces being aligned, and the lengths of each of the radiating element pieces defining a terminating portion for the upper conductor and exposing the dielectric layer beyond the terminating portion, and wherein the lengths and widths of the five or more radiating element pieces are selected such that the planar antenna device transmits electric power in at least a 1.5 GHz band in a range of operating frequencies between 4 GHz and 6 GHz for near field communication in which a communication distance is less than or equal to a wavelength corresponding to an operating frequency in the range, wherein the five or more radiating element pieces are each formed into rectangular strips on one side of the feeder line, and are connected in a width direction of the single radiating element to form the single radiating element, wherein, when the single radiating element includes N number of the radiating element pieces having the widths represented as W wherein N represents an integer equal to or greater than five, and a subscript of W wherein the width W