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A microstrip-fed compact multi-band slot antenna using a single split-ring resonator (SRR) is proposed. The SRR acting as a loading element introduces multiple lower-order resonances in the antenna, which can be controlled by varying the SRR's dimensions as well as its position with respect to the arm of the slot, without altering the geometry of the radiating slot. The concept is validated by a full-wave simulation study and by measurement on a fabricated prototype. The proposed antenna has satisfactory gain and monopolar radiation patterns in all the operating bands.

A novel ‘coplanar waveguide’-fed planar monopole antenna with dual-band operation for WiFi and ‘long-term evolution 4G (LTE)’ applications is presented. The simple antenna's geometry is composed of a circular radiating patch with a smiling slot, and it occupies a small size of 41.6(L) × 28.38(W) × 1.52(h) mm3. Two operating bands covering 2.3–3.0 and 4.7–5.9 GHz are achieved by carefully optimising the position and size of a smiling slot. An antenna prototype has been manufactured and it has been characterised in terms of return loss and radiation pattern measurements in anechoic chamber exhibiting almost omnidirectional patterns and appreciable gain across the operating bands, being suitable for WiFi and 4G LTE applications.