A Wideband Circular Patch Antenna Excited in the Broadside $\text{TM}_{12}$ Mode

The predominance of the sidelobes in the antenna patterns, polarization impurity and the requisite of larger physical dimensions has inhibited the exploration of the wideband capability of the higher order broadside modes. Overcoming all these constraints, in this paper, a novel circular microstrip patch antenna excited in the broadside TM
12
mode with a 45% impedance bandwidth is presented. The superiority of the proposed antenna is that its radius is on par with that of the antenna excited in the dominant TM
11
mode and more importantly the realized radiation patterns are stable and free from sidelobes.