Wideband Antenna Design and Fabrication for Modern Wireless Communications Systems

AbstractOne 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 6.0GHz, covering WiFi frequencies at 2.4-2.48GHz, 5,15-5,35GHz and 5,725-5,825GHz, as well as WiMax frequencies at 2.3-2.4GHz, 2.495-2.695GHz, 3.3-3.8GHz, and 5.25-5.85GHz. The antenna construction consist of a truncated circular patch with a coplanar waveguide (CPW)-fed line, printed on an 0.8mm 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 9.54dB or VSWR of 2 can be achieved for the desired 2.3 to 6GHz frequency band from measurement results. The antenna gain increases almost linearly from 0dB at 2.3GHz to around 4.5dB at 6GHz. 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