Wideband Antenna Design and Fabrication for Modern Wireless Communications Systems

One of major challenges in antenna design for modern wireless communication system is to construct a single antenna that can serve a non-contagious frequency allocation using various wireless technologies. In this paper, a wideband antenna design approach is proposed to produce a single antenna that can be used by various wireless technologies using different frequencies from 2.3 to 6.0 GHz, covering WiFi frequencies at 2.4-2.48 GHz, 5,15-5,35 GHz and 5,725-5,825 GHz, as well as WiMax frequencies at 2.3-2.4 GHz, 2.495-2.695 GHz, 3.3-3.8 GHz, and 5.25-5.85 GHz. The antenna construction consist of a truncated circular patch with a coplanar waveguide (CPW)-fed line, printed on an 0.8 mm thick of FR4 epoxy dielectric substrate with permittivity ɛr=4.3. Comparation of return loss, VSWR, gain, and radiation pattern between simulation and measurement results appears in close aggrements. Return loss of 9.54 dB or VSWR of 2 can be achieved for the desired 2.3 to 6 GHz frequency band from measurement results. The antenna gain increases almost linearly from 0 dB at 2.3 GHz to around 4.5 dB at 6 GHz. The antenna radiation pattern is found to have an apple-like pattern, which is bidirectional pattern in x-y plane and circular pattern in x-z plane.