Design of circularly polarized antenna using inclined fractal defected ground structure for S-band applications

Abstract

ABSTRACT A single feed square patch with inclined fractal defected ground structure (IFDGS) microstrip antenna for circular polarization (CP) is proposed in this article. The CP radiation is achieved by an inclined fractal-shaped slot is embedded along the diagonal axis of a ground plane. To enhance the performance parameters of this antenna like axial ratio bandwidth, return loss bandwidth, and gain, an inclined fractal structure is slotted into the ground plane. The parameter studies of the IFDGS are given to illustrate the way to obtain CP radiation. The CP antenna with the third iterative IFDGS is fabricated and measured. The measured results validate simulated results and show good agreement. The proposed antenna achieved CP radiation at 2.61 GHz with an overall size of 41 × 41 × 1.6 mm3. It shows an impedance bandwidth of 5.53% at center frequency of 2.6 GHz and 3-dB axial ratio (AR) bandwidth of 1.14% at center frequency of 2.61 GHz. The measured peak gain for the proposed antenna is found as 4.12 dBi. The proposed antenna can be suitable for wireless communication in S-band.