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 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 Sex Toy Kits and Collections 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 NEFF C17MS32H0B N90 Built In 60cm Electric Single Oven Stainless Steel the feeding network, the other involving one 180° hybrid and six power dividers.Bandwidths larger than 25%, gains around 12 dBi and cross-polarization below −25 dB have been achieved by the two arrays at a center frequency of 5.5 GHz.