Design of compact slot antenna based on split ring resonator for 2.45/5 GHz WLAN applications with circular polarization

Abstract

In this article, compact slot antenna based on split ring resonator (SRR) with circular polarization (CP) for 2.4/5 GHz WLAN applications is noticed. Using metamaterial with both negative permittivity and permeability improves the antenna parameters. Thus, the prototype antenna is designed based on metamaterial SRRs to achieve CP and compact size. The final antenna has bi‐directional pattern with CP and dual‐band at 2.2–2.8 GHz for WLAN, Bluetooth application, and 5.2–7 GHz for IEEE WLAN protocol with gain 2.1 and 2.5 dBi, respectively. The size of prototype patch antenna is 40 × 40 mm. It is designed and fabricated on FR‐4 low cost substrate with εr = 4.4 and thickness of 1.6 mm. It is simulated by HFSS commercial full wave software. In addition, the experimental results are presented and compared here with simulation. The antenna efficiency is more than 90% for first band and more than 80% for second band and typically is more than 70% in 2–7 GHz. The antenna gain is simulated and compared with measurement and antenna gain is around 3–4.5 dBi. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:12–16, 2016

A Dual Band Slot Antenna for Wireless Applications With Circular Polarization

“…In comparison with our previous research [32,33], in this paper, we show how the split ring produces double negative characteristics, and the antenna shows good axial ratio where we have negative characteristics.…”

Metamaterial loads used in microstrip antenna for circular polarization: Review

“…K, Copolarization and RHCP for 5.5 GHz. L, All the dimensions of the antenna are a = 40 mm, b = 40 mm, c = 13 mm, d = 10 mm, e = 12 mm, f = 5 mm, and g = 4 mm, with RHCP Z direction and LHCP in −Z direction and maximum gain of 4.1 dBi and efficiency is up to 80%…”

“…Here, the SRR part has 1 mm width and at the same time special rectangular slots are used in this antenna for improving the bandwidth and achieving CP and the width of the bent feed line have been considered 2 mm for better matching as seen in Figure A …”

“…The obtained gain is around 3 to 4.5 dBi. In Figure H‐K, antenna patterns for both frequencies are depicted at 2.5 and 5.5 GHz for phi = 90° and the RHCP and LHCP are presented in which the requested CP can be seen …”

Reactive impedance surface based multisystem satellite navigation antenna

“…To achieve circular polarization required for GNSSs, metamaterials can cooperate with patch antennas to produce CP radiation . By etching complementary split ring resonator (CSRR) patterns on the ground, the number of resonant frequencies of a CP antenna could be increased .…”