Patent ID: 9007275
Filing Date: 2015-04-14
Classification: H01Q

Abstract:
1. A handheld device for wireless communication comprising: an antenna system included within the handheld device for wireless communication and configured to operate in at least one operating frequency band having a required operating frequency bandwidth, the antenna system comprising: a ground-plane; first and second antenna elements connected to a common input/output port, each of the first and second antenna elements comprising one driven point, wherein a frequency bandwidth of each of the first and second antenna elements is less than the required operating frequency bandwidth and less than a frequency bandwidth for the antenna system, and wherein the first and second antenna elements are not arranged as a directive antenna array that provides a directive radiation pattern; first and second signal transmission paths respectively coupled to the first and second antenna elements; a combining structure configured to couple the first and second signal transmission paths to the common input/output port; and at least a first phase shifting element disposed along the first signal or second signal transmission path and configured to impart a phase delay to signals on the first or second signal transmission path, the phase delay providing a phase shift configured to minimize a sum of reflection coefficients of the first and second antenna elements measured at the common input/output port and to cause the frequency bandwidth for the antenna system to be at least as great as the required operating frequency bandwidth, wherein: the first antenna element is shaped as a first curve and the second antenna element is shaped as a second curve; each of the first and the second curve comprises at least five segments, wherein each of the at least five segments is shorter than a twentieth of the free-space operating wavelength corresponding to a lowest frequency of the at least one operating frequency band; the first and the second curves comprise a different number of segments; and the first and second antenna elements are arranged such that orthogonal projections of the first and second antenna elements on a plane of the ground-plane are outside a boundary of the ground-plane.