A dual-band textile antenna loaded with an artificial magnetic conductor (AMC) plane is proposed for WLAN applications. Its dual-band operation is enabled by a rectangular patch in the 2.4 GHz band and a patch-etched slot dipole in the 5 GHz band. Since the AMC approaches a perfect magnetic conductor (PMC) in the 5 GHz band, the slot dipole can be located close to the ground. The proposed antenna is fully fabricated using textiles except for a feeding connector used for testing purposes and a via. Simulations and experiments agree well and validate that this low profile antenna operates with a good reflection coefficient and a high front-to-back ratio (FBR) within the desired bands.Index Terms-Artificial magnetic conductor (AMC), dual-band antenna, metamaterial, textile antenna.

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A compact circular polarizer is presented, which is based on a twisted double split-ring resonator (DSRR). The bottom DSRR is rotated 90° with respect to the top one. When the structure is illuminated by a normally incident linearly polarized wave, the two linear components of the transmitted wave have nearly equal amplitudes and 90° (−90°) phase difference around the resonant frequency. This means that the transmitted wave with left-handed circular polarization is much larger (smaller) than the one with right-handed circular polarization. The electric fields and currents on the structure are analyzed to illustrate this phenomenon. The size of each unit cell in this structure is extremely small compared with the wavelength in all three dimensions. Both simulations and measurements verify our design at microwave frequencies.