Multi SRR Patch Antenna with Split Ring Configuration Feeding under 8 GHz Communication

Abstract

The demand for wireless devices is increasing every day and hence the compact antenna. A microstrip based patch radiator is possibly the most compact forms of available antenna utilized in modern communication system such as mobile handset because of its obvious reason viz. easy on chip development, low cost and low profile. It is a well-known fact that the electrical length of a patch antenna is responsible to its compactness rather its physical length. Various approaches have been investigated by numerous researchers mostly in current period, however the majority of them suffer from deprived return loss and limited bandwidth. The overall dimensions of a patch antenna can be reduced by reducing the electrical length by using metamaterial concept such as Split Ring Resonator (SRR) structure. This research study has designed four SRR based antennas for the most utilized spectrum under 8 GHz frequency range. At 1.9 GHz, the proposed, modified SRR structure can radiate with a bandwidth expansion of 30% over the third design, and at 7.40 GHz, a bandwidth enhancement of 68.2 percent has been achieved over the first design. The results of the fourth suggested antenna are the best in terms of antenna gain at the maximum frequency range of 7.40 GHz, with 1.82 dB, a 2.79 dB improvement over the first design. In terms of circular polarization, the first design can produce circular polarization at a frequency of 6.9 GHz with an axial ratio of 2.1 dB and a bandwidth of 220 MHz, while the third design has the lowest return loss at -42.65 dB at 5.7 GHz but weak antenna gain and axial ratio. The suggested design, which uses various SRR and feeding methods, gives us a sense of taste of SRR's impact on antenna gain, bandwidth, and axial ratio for multiband applications in the 8 GHz band.