This article presents a compact, single feed dual-band dual-polarized (DBDP) microstrip antenna. The proposed design involves an inverted Y-shaped radiating patch and a rectangular open-loop positioned near its right corner that creates mutual coupling to attain wideband circular polarization (CP). To achieve enhanced axial ratio bandwidth (ARBW), a semi-rectangular ground plane with two asymmetric truncated L-shaped slots has been used. An L-shaped slotted quarter wave microstrip line feed is used here for broader ARBW and proper impedance matching. The measured dual impedance bandwidths (IBW) in the range 5.85-6.52 GHz (centre resonance frequency frc1 = 6.19 GHz, 10.66%) in lower frequency region and 7.25-13.64 GHz (frc2 = 10.445 GHz, 61.18% bandwidth) in higher frequency region. The two ARBW bands span over 7.22-10.99 GHz (fc1 = 9.105 GHz, 41.41%) and 11.67 GHz-12.25 GHz (fc2 = 11.96 GHz, 4.85%). The measured peak gains between 3.20 and 4.96 dBi over the entire IBW range makes the LP and CP bands suitable for ITS (5.9 GHz), U-NII-5 of 6 GHz band, some C-band, ITU-8 GHz, some X-band, and Ku-band applications.
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