Dual-band antenna array with both fan beam and pencil beam

A dual-band antenna array with both fan beam and pencil beam, wherein:

• the dual-band antenna array is arranged on the upper surface of a substrate (1);
• the dual-band antenna array comprises four subarrays arranged in a y-axis direction, with adjacent subarrays spaced at the same distance;
• and
• each of the subarrays is composed of a first antenna element and a second antenna element which are cascaded in an x-axis direction by a filter phase-shift line (24);
• wherein the dual-band antenna array further comprises two pairs of T-shaped monopoles, that is, a first monopole (5) and a first metallic post (13) loaded in the monopole as well as a fifth monopole (9) and a fifth metallic post (17) loaded in the monopole are symmetrically placed at the upper side of a micro-strip patch (21), respectively;
• wherein the dual-band antenna array further comprises two pairs of T-shaped monopoles, that is, a second monopole (6) and a second metallic post (14) loaded in the monopole as well as a sixth monopole (10) and a sixth metallic post (18) loaded in the monopole are symmetrically placed at the lower side of a micro-strip patch (21) in the first antenna element, respectively;
• and
• wherein the dual-band antenna array further comprises two pairs of T-shaped monopoles, that is, a third monopole (7) and a third metallic post (15) loaded in the monopole as well as a seventh monopole (11) and a seventh metallic post (19) loaded in the monopole are symmetrically placed at the upper side of a micro-strip patch (22) in the second antenna element.