High-Gain SIR Dual-Band Antenna Based on CSRR-Enhanced SIW for 2.45.25.8 GHz WLAN

Abstract EN

This paper presents a dual-band step impedance resonator (SIR) antenna based on metamaterial-inspired periodic structure of coupled complementary split-ring resonators substrate-integrated waveguide (CSRR-SIW).

The antenna supports wireless local area networks (WLAN) bands at 2.4/5.2/5.8 GHz.

The CSRRs and two branches of the SIR element are etched on the top and bottom metal surfaces of the substrate.

The SIR element produces a fundamental frequency f1 at 2.4 GHz and a second harmonic frequency fs2 at 5.7 GHz.

Meanwhile, the CSRRs produces a resonant frequency at high-frequency band around 5.2 GHz, which can be combined with the second harmonic frequency fs2 at 5.7 GHz.

The high-frequency bandwidth can then be broadened.

The simulated and measured results show that the dual operation bands with bandwidths of 16% from 2.25 GHz to 2.64 GHz and 18.2% from 5 GHz to 6 GHz for |S11| < −10 dB are achieved.

Meanwhile, the proposed antenna has peak gains ranging from 6.5 dBi to 7 dBi and from 7 dBi to 7.7 dBi in the lower and upper bands, respectively.

Compared with many previously reported dual-band antenna designs, the proposed antenna achieves comparable bandwidth performance and larger gain per unit area with a relatively smaller size.

Moreover, the simple structure renders the proposed antenna has the advantage of easy-processable and cost-effective implementation.