Patent ID: 9634395
Date: 2017-04-25
CPC Classifications: H01Q,Y10T

Claim:
1. An antenna structure comprising: a monopole antenna located in a first plane; a microstrip coupled to the monopole antenna and located in the first plane; and a ground plane located in a second plane parallel to the first plane and comprising a balun structure having at least two arms disposed symmetrically in the second plane beneath the microstrip and perpendicular to the monopole antenna, wherein the monopole antenna does not overlap the at least two arms, wherein the at least two arms are disposed symmetrically beneath the microstrip and perpendicular to the monopole antenna such that a position of a first of the at least two arms is a reflection of a position of a second of the at least two arms about a central axis of a length direction of the monopole antenna, wherein the monopole antenna is a rod-shaped antenna that extends linearly along the central axis, and wherein the at least two arms are configured to force current flowing on the ground plane into the at least two arms to reduce current available for causing backward radiation.