A new method of bandwidth widening for square patch antenna fed by proximity feeding line

In this paper, a design of square patch antenna with bandwidth widening using multiple slots is proposed. The resonant frequency of antenna is designed at the frequency of 5.3GHz for C-band application. The shape of patch antenna is square with the dimension of 12.3mm × 12.3mm. The antenna which has the total thickness of 1.6mm is fed by proximity feeding line through a 50Ω SMA connector. The number of slots are 7 located diagonally over the patch and separated 1.2mm each other which also produce circular polarization. Each slot has different length where the center slot has the longest length. To show the feasibility of bandwidth widening, a conventional antenna made of square patch without slots is also investigated. FR4 epoxy dielectric substrates with the relative permittivity of 4.3mm are used for both antennas. The simulation result shows that the −10dB bandwidth response of square patch antenna with multiple slots increases up to 210% compared to the conventional one demonstrating the feasibility of proposed method in enhancing the characteristic of square patch antenna.