LAUSR

This letter presents a novel low-profile high-gain antenna with cross-polarization (x-pol) suppression using cross circular loop resonator (CCLR) metamaterial (MTM) slab in substrate-integrated waveguide-fed-slot antenna (SIW-SA). The SIW-SA antenna, which is the reference antenna, operates at 9.73 GHz. The CCLR MTM slab acts as a low-impedance slab, which is placed in the superstrate of the reference antenna at the height of only λ0 /10, where λ0 is the free-space wavelength at the resonance frequency of the antenna. At the broadside direction, the proposed antenna obtains 5.8 dB higher gain, 10 dB lower x-pol level (in both radiation planes), and 9.1 dB higher front-to-back ratio than the reference antenna, due to the presence of low-impedance slab. The simulated results are verified with fabrication and measurement.