Small size tripleband monopole antenna with a parasitic element

A small size (20 × 38.5 × 0.8 mm3) coplanar waveguide (CPW)-fed monopole antenna for wireless local area network and worldwide interoperability for microwave access applications is proposed. To achieve tripleband operation, the proposed monopole antenna is designed with a modified symmetrical U-shaped printed structure attached with a parasitic element behind it. Good impedance matching is also attained by loading two dissimilar notches separately into the two CPW ground planes. The measured 10-dB impedance bandwidths of the three operating bands (fL, fM, and fH) are 16.96% (2.105–2.495 GHz), 28.72% (3.22–4.30 GHz), and 23.32% (4.895–6.125 GHz), respectively, and all bands of interest have yielded peak gain and radiation efficiency of more than 2.7 dBi and 65%. Detail process of designing the proposed antenna is explicitly shown, and vital parametric studies were also conducted by simulation. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:342–348, 2015