Design of a rectangular spiral antenna for Wi-Fi application

This paper highlights the design, simulation, analysis and fabrication of a coaxial-fed rectangular spiral microstrip antenna (RSMA) for Wi-Fi application. The centre frequency is 2.45 GHz and the bandwidth is 22 MHz. The radiation pattern of this RSMA illustrated an omni-directional pattern with voltage standing wave ratio of less than two (2), return loss of less than -10 dB, the line impedance of 50 Ω and gain of 5 dBi. All the design and simulation of this RSMA were carried by using a commercial 3-D electromagnetic simulator. The prototype was fabricated on FR 4 substrate with 4.9 dielectric constant and 1.54 mm of thickness. Vector network analyzer ZVA40 was used to measure all the parameters of this RSMA. The 2D radiation pattern was obtained by using antenna training system ED3200. It was observed that the simulated and measured values of the parameters of the RSMA were quite close with each other.