Compact dual-band circularly polarized inverted y-shaped printed monopole antenna with edge ground
Keywords:, Circular polarization (CP), Impedance bandwidth, C and X band.
A compact dual-band circularly polarized (CP) printed antenna with microstrip line feed is studied in this paper. It consists of an inverted y-shaped radiator with an edge ground plane on the opposite side of the substrate. The edge ground plane plays important role in impedance bandwidth (IBW) enhancement. In order to enhance the axial ratio bandwidth (ARBW) by a significant amount, the dimensions of the inverted y-shaped radiator are optimized. The value of measured IBW is equal to 4.48 GHz (4.94–9.42 GHz; 62.39%) with the resonant frequency fr = 7.18 GHz. The proposed design exhibits the simulated IBW of 5.557 GHz (4.933–10.490 GHz; 72.05%) with the resonant frequency fr = 7.7 GHz. The corresponding simulated ARBWs are equal to 742.5 MHz (fCP1 = 6.32 GHz, 11.75%) and 1091.8 MHz (fCP2 = 8.32 GHz, 13.12%) within the range of simulated and measured IBW, respectively. The presented antenna is compact with the optimized dimension of 20×20×1.6 mm3, i.e. 0.54×0.54×0.044λgL3, where λgL is the guided wavelength at the simulated lower resonant frequency fgL = 4.933 GHz with size reduction of 39.7%. It is fabricated on the low cost FR-4 substrate with copper cladding. Measurement results validate simulated data from Ansys Electronics Desktop 2020 R1. The maximum simulated peak gain is equal to 4.796 dBi at 8.64 GHz within the CP band. The proposed antenna can be suitable for some portions of C- and X-, and ITU-8 GHz band wireless communication applications.
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