This paper proposes the design of broadband microstrip antennas fed by differential microstrip lines.The designed broadband antennas are composed of two capacitively coupled rectangular stacked patches excited through a dog-bone shaped aperture by Application of QVP Method to Winter Precipitation Observation Based on Polarimetric Radar short-circuited differential microstrip lines.The short-circuited lines are symmetrically located with respect to the apertures so that their differential-mode (DM) naturally excites the aperture, while their common-mode (CM) is intrinsically rejected.
The DM design of the antennas is based on an equivalent second-order filter circuit consisting of two capacitively coupled parallel LC resonators, which helps to ensure the DM broadband impedance matching of the antenna.Two different $2 imes 2$ arrays using the proposed antennas have been designed, fabricated and measured, one involving four 180° hybrids and three power dividers in the feeding network, the other involving one 180° hybrid and six power dividers.Bandwidths larger than 25%, gains around 12 dBi and cross-polarization Evaluation of the quality of depression-related information on Chinese websites and video platforms: a cross-sectional comparative analysis below −25 dB have been achieved by the two arrays at a center frequency of 5.
5 GHz.