A Wideband Compact Magneto-Electric Dipole Antenna Fed by SICL for Millimeter Wave Applications

A wideband compact magneto-electric (ME) dipole antenna is investigated for millimeter wave applications. First, an aperture coupled ME dipole is proposed with wideband and low profile. Next, transverse slots are added to miniaturize the antenna. The radiation performance of the higher order mode is also improved. The antenna is finally miniaturized to 2.5 × 3.3 mm² (0.27 λ₀ × 0.35 λ₀, where λ₀ is wavelength in free space at center frequency) when it is used in the array environment. A bandwidth of 48.8% (24.3-40 GHz) for SWR < 2 can be achieved, with unidirectional radiation performance over the operating band. By combining the proposed compact antenna with an 8-way substrate integrated coaxial line (SICL) feed network, a 1 × 8 linear array is designed, fabricated, and measured. Good beam scanning capability is also verified by active simulation. With the advantages of wide bandwidth, compact size, promising radiation pattern and wide-angle beam scanning potential, the proposed antenna would be attractive for millimeter wave devices and antenna in package (AiP) applications.