Furthermore, the radiator size reduced due to increasing the electrical length on the radiator.
In this paper, the ring radiator circumference of the first iteration designed
approximately one free space wavelength (A.o) at the operating frequency of 2.45 GHz is
presented with the line width of ring radiator parameter WL.
Therefore, the antenna was implemented on an economical FR4 substrate with thickness of 1.6 mm, relative permittivity of 4.1 and loss tangent of 0.019. Especially, the presented
antenna with the dimensions of 32.5 x 44.1 mm2 is fed by the 50 Q microstrip feed line on the top layer of the substrate.
The optimal parameters of the presented antenna are composed of h = 1.6 mm, Ls = 15.69 mm, Wg = 32.5 mm, Lg = 19.6 mm, Wt = 4.11 mm, Lt = 7.85 mm, Wf = 3.1 mm, L1 = 4.9 mm, S = 0.57
mm. The consequential parameters of Ws), WS2, Wp), Wp2 and Wp3 will be verified and noticed for the property of the alternately operating frequency bands in the next section