Abstract
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.
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