FDTD analysis of patch antennas on high dielectric-constant substrates surrounded by a soft-and-hard surface

摘要: The surface-wave diffraction at the edge of a finite-size substrate with high dielectric constant is dominant mechanism affecting radiation pattern patch antenna fabricated on this material. A soft-and-hard surface (SHS) can be used to block waves from propagating outward along substrate, thus reducing unwanted diffraction. Patch antennas surrounded by SHS are analyzed using finite-difference time-domain (FDTD) technique that implements boundary conditions simple modified subcell model. square stacked-patch and circularly polarized (CP) thick LTCC multilayer investigated. It shown big-size significantly improved while backward level CP small-size considerably reduced.