一种新型宽频带微带贴片天线OA

To overcome the inherently narrow bandwidth of conventional microstrip antennas,this work proposes a wideband microstrip patch antenna using an L-shaped parasitic structure.The antenna consists of a main radiating patch and L-shaped parasitic elements,with an overall size of 0.83λ₀×0.83λ₀×0.083λ₀,where λ₀ denotes the free-space wavelength at the 5 GHz center frequency.The main patch operates in the fundamental transverse magnetic(TM10)mode,while multiple resonances are introduced via electromagnetic coupling with the parasitic elements,thereby significantly extending the bandwidth.A Rogers 5880 substrate with a relative permittivity of 2.2 and a loss tangent of 0.000 9 was used to reduce the quality factor.A 180° out-of-phase differential feeding scheme was applied to suppress radiation pattern distortion.Simulation results show that the proposed antenna achieves a voltage standing wave ratio(VSWR)below 2 from 3.6 GHz to 6.6 GHz,corresponding to a 60%fractional bandwidth—six times wider than that of traditional microstrip designs.The antenna exhibits a peak gain of 9.8 dBi at 6.2 GHz,with gain variation within 1.5 dB across the operating band.The main beam remains stable,with a pointing deviation within 5°,and cross-polarization levels remain below-15 dB over 3.6 GHz to 6.3 GHz,reaching as low as-38 dB at the center frequency.This single-layer configuration achieves both broadband and high-gain performance,demonstrating strong potential for broadband wireless applications,including 5G communication and Wi-Fi systems.