A compact dual band dual polarized monopole antenna with enhanced bandwidth for c, x, and ku band applications

Abstract

—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.