Abstract
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.
Highlights
Multiband band antennas are widely used in modern wireless systems, as well as radar [1]
Antenna Geometry. e proposed antenna is shown in Figure 1. e CSRR-SIW is the same as that in [15]. e difference is that the main element is step impedance resonator (SIR), which can achieve a dual operation bands which consists of a fundamental frequency f1 and a second harmonic frequency fs2. e CSRRs and two branches of the SIR element are etched on the top and bottom metal surfaces of the substrate. e substrate is Rogers 5880. e thickness of 0.504 mm and a dielectric constant of 2.2
The CSRRs produces a resonant frequency at high-frequency band around 5.2 GHz
Summary
Multiband band antennas are widely used in modern wireless systems, as well as radar [1]. In [2], a quasi-Yagi antenna with operating bands around 1.8, 2.4, and 3.5 GHz is proposed. In [4], a dual-band magnetoelectric antenna is proposed. In [6], a wideband three-dimensional dual-band magnetoelectric (ME) dipole antenna is presented for WLAN and WiMAX applications. In [7], a dual-band 3 × 2 antenna arrays with 10.6% from 2.3 to 2.56 GHz and 16.6% from 3 to 4.2 GHz bandwidths is proposed. A miniaturized dual-band dipole array antenna consisting of two parallel 1 × 4 subarrays and three-layers of substrate for use in base stations is proposed in [8]. In [9], a 4 × 4 Ku/Ka dual-band shared-aperture beam scanning antenna array is proposed.
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