Patent ID: 9160054
Filing Date: 2015-10-13
Classification: H01Q

Abstract:
1. A radio frequency (RF) identification tag with coplanar waveguide structure, comprising: a substrate; a planar antenna and an RF chip disposed on the substrate; and a coplanar waveguide structure, disposed on the substrate and coupled to the planar antenna, wherein the coplanar waveguide structure is composed of a plurality of signal conductors and a plurality of ground conductors interlaced on two opposite sides of the signal conductors, and the coplanar waveguide structure comprises: an impedance match portion having an input end and a ground plane, wherein the input end is coupled to the signal conductors, the ground plane is coupled to the ground conductors, and the RF chip is disposed between the input end and the ground plane, wherein the signal conductors comprise a first signal conductor, a second signal conductor and a third signal conductor, and the ground conductors comprise a first ground conductor, a second ground conductor, a third ground conductor and a fourth ground conductor, wherein the first signal conductor is located between the first ground conductor and the second ground conductor, and the first signal conductor is coupled to the input end and the ground plane or the first ground conductor, such that the first signal conductor, the first ground conductor and the second ground conductor together constitute a first shorted transmission line; the second signal conductor is located between the second ground conductor and the third ground conductor, the second signal conductor is coupled to the input end and the ground plane, and the RF chip is coupled to the second signal conductor, such that the second signal conductor, the second ground conductor and the third ground conductor together constitute an RF signal transmission line; and the third signal conductor is located between the third ground conductor and the fourth ground conductor, and the third signal conductor is coupled to the input end and the ground plane or the fourth ground conductor, such that the third signal conductor, the third ground conductor and the fourth ground conductor together constitute a second shorted transmission line; and a transmission portion connected between the impedance match portion and the planar antenna.