An Asymmetric CPW-Fed Compact Dual-Band Circularly Polarized Monopole Antenna

This paper proposes a compact, dual-band circularly polarized monopole antenna. Here, a rectangular strip with an I-shape is utilized as radiating element and 50 Ω microstrip inset line feeding is used to trigger the essential vertical and horizontal component for achieving circular polarization. The asymmetrical coplanar waveguide (CPW) fed ground plane is used for obtaining axial ratio below 3 dB within the impedance bandwidth region. The size of the antenna is 32.62 × 22.69 mm2 (0.674 × 0.468 λ02). The proposed antenna generates dual impedance bandwidth of 6.22–8.29 GHZ and 15.99–18.58 GHz which are resonating at 7.25 and 17.28 GHz, and they are 28.55% and 14.98%. The dual circularly polarized ARBW ranges from 7.68 to 8.08 GHz and 15.11–16.19 GHz which are resonating at 7.84 and 15.65 GHz, they are 6.12% and 6.90%, and they are LHCP radiation patterns. One can employ the lower resonant frequency band for broadcasting and fixed mobile application, and higher resonating band can be used for broadcasting and fixed radio-location application.