Antenna structure for MIMO application

#1. Technical Field

#The present disclosure relates to antenna structures, and particularly to an open-slot monopole antenna structure for MIMO application.

#2. Description of Related Art

#Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

#FIG. 1(a) is a schematic diagram showing a front view of an antenna structure for a MIMO application, according to an embodiment; FIG. 1(b) is a cross-sectional view taken along line A-A′ of FIG. 1(a).

#FIG. 2(a) is a schematic diagram showing a rear view of the antenna structure of FIG. 1(a); FIG. 2(b) is a cross-sectional view taken along line B-B′ of FIG. 2(a).

#FIG. 1 shows an open-slot monopole antenna structure 10 for a MIMO application of the embodiment. The antenna structure 10 includes a substrate 11, a metal ground layer 111, a first antenna element 12, and a second antenna element 13. The substrate 11 includes a first surface 101 and a second surface 102 opposite to the first surface 101. In the embodiment, the metal ground layer 111 covers a portion of the first surface 101 of the substrate 11, and the first antenna element 12 is arranged on the metal ground layer 111. The second antenna element 13 is arranged on the first surface 101 adjacent to the first antenna element 12 and extends away from the metal ground layer 111. In the embodiment, the first antenna element 12 is an open-slot antenna, and the second antenna element 13 is a monopole antenna.

#In the embodiment, the first antenna element 12 includes an open-slot 122, which extends from an edge of the metal ground layer 111 toward an inner portion of the metal ground layer 111, and divides the metal ground layer 111 into a first metal ground layer 111a and a second metal ground layer 111b. Thus, the open-slot 122 is open at one end adjacent to the edge and closed at the other end at the inner portion.

#FIG. 2 shows that the first antenna element 12 further includes a signal feed-in member 121, which is arranged on the second surface 102 of the substrate 11 and spatially corresponds to the open end of the open-slot 122. Opposite end portions of the signal feed-in member 121 are mounted on the substrate 11 and spatially correspond to portions of the metal ground layer 111 on opposite sides of the open-slot. In the embodiment, opposite end portions of the signal feed-in member 121 spatially correspond to portions of the first metal ground layer 111a and the second metal ground layer 111b, respectively. The signal feed-in member 121 is a microstrip line or a coaxial cable.