“Metamaterials” are the structures artificially engineered to realize unusual electromagnetic properties not yet found in nature. The introduction of metamaterials has greatly spurred the development of electromagnetic theory and engineering. At microwave bands, the application of metamaterial-based technologies to enhance the performance of antennas is attractive to both academia and industry. This talk will update the latest progress in developing metamaterialbased technologies for low-profile and broadband antennas at RF and microwave bands. One is how to manipulate the dispersion property of patch antennas to achieve a broad operating bandwidth with an ultra-low profile. The other one is how to introduce an anisotropic metadielectric loading to a dipole antenna to realize ultra-low profile and high radiation efficiency over a broad bandwidth. Both design ideas have been successfully used in practical wireless systems.