A Wide-Bandwidth Monopolar Patch Antenna with Dual-Ring Couplers

Table 1

The physical parameters and impedance bandwidth, for the circular patch antennas in Figure 2.

Symbol	No ring	Single-ring coupled	dual-ring coupled
ℎ	1.5 mm	1.5 mm	1.5 mm
𝜀𝑟	2.55	2.55	2.55
𝑅𝑔	60 mm	60 mm	60 mm
𝑅𝑝	18 mm	18 mm	18 mm
𝑅1		12 mm	12.25 mm
𝑊1		1 mm	0.3 mm
𝑅2			11.25 mm
𝑊2			1 mm
𝐵𝑊		13%	27%