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An electrically small multiband planar antenna is presented by using rectangular split ring resonator (RSRR) metamaterial element for LTE, WiMAX and WLAN applications. The designed antenna possesses asymmetric coplanar strip (ACS)-fed Hilbert Curve Fractal Antenna (HCFA) loaded with RSRR metamaterial for multiband radiation at 1.44 GHz, 3.76 GHz and 5.27 GHz. ACS-fed HCFA is responsible for creating the first (at 1.44 GHz) and second (at 3.76 GHz) resonance frequencies owing to the coupling between ACS-fed HCFA and ground plane. Moreover, the RSRR yields upper resonance at 5.27 GHz owing to the metamaterial transmission line. The stop band and pass band nature of the RSRR and its negative permeability characteristics are described using an effective medium theory. An equivalent circuit model of the proposed antenna is investigated with the help of Agilent ADS to validate the operating frequencies. Also, the geometrical parameters have been optimized using the artificial neural network (ANN), which is performed by MATLAB. The proposed antenna has been fabricated on a 18 × 16.5 × 1.6 mm3 FR-4 dielectric having ε r = 4.4 and tan δ = 0.02. It provides multiband response at 1.4 GHz, 4.4 GHz and 5.3 GHz with a − 10 dB impedance bandwidth of 330 MHz, 570 MHz, and 340 MHz, respectively, which is usable for LTE, WiMAX and WLAN band applications. [ABSTRACT FROM AUTHOR]

A dual-band substrate integrated waveguide (SIW) cavity backed antenna loaded with complementary split ring resonator (CSRR) metamaterial is proposed for WiMAX/WLAN band applications. This antenna uses a rectangular cavity and CSRR slots on the ground plane for dual band radiation. The rectangular SIW cavity resonator produces two cavity modes TE 110 and TE 120 into free space owing to array of metallic vias. By introducing CSRR, it excites the lower hybrid modes for realizing a low-profile antenna design at 2.5 GHz due to strong coupling effect in the SIW cavity resonator. The mode theory mechanism is utilized for analysis the designed antenna. The geometry of the fabricated antenna is developed on a low cost FR-4 dielectric substrate with dimensions 30 × 30 × 1.6 mm3 to resonance at 2.5 GHz and 5.4 GHz. The experimental S 11 (dB) exhibits a fractional bandwidth of 4% (2.45–2.55 GHz) in the lower resonant frequency of 2.5 GHz and 2.4% (5.33–5.46 GHz) in the higher resonance frequency of 5.4 GHz. The designed antenna possesses significant advantages of low-profile, better S 11 (dB), planar configuration and unidirectional radiation patterns. [ABSTRACT FROM AUTHOR]

A miniaturized dual-band antenna is proposed for industrial scientific and medical (ISM), worldwide interoperability for microwave access (WiMAX), and wireless local area network (WLAN) applications. The proposed antenna consists of hexagonal complementary split-ring resonator (HCSRR), metamaterial-inspired split-ring structure, and a partial ground plane. The prototype antenna is fed by 50-Ω microstrip feed line, which is printed on a 30 × 30 × 0.8 mm3 FR-4 substrate. HCSRR in the radiating element is used to create a new resonance at 2.4 GHz for achieving dual-band characteristics. A split in the outer hexagonal ring induces a magnetic resonance which leads to improvement of the bandwidth of the antenna. The proposed antenna is fabricated and measured. The measured -10-dB impedance bandwidths are 180 MHz (2.42–2.60 GHz) and 2400 MHz (3.44–5.84 GHz) with a resonance frequency of 2.56 GHz and 4.64 GHz, respectively, which is suitable for ISM, WiMAX, and WLAN applications. Analysis of HCSRR is discussed in detail using empirical design equation with metamaterial property. The prototype antenna has suitable radiation characteristics for all resonance frequencies. [ABSTRACT FROM AUTHOR]

In this paper, a miniaturized ELC (Electric-inductive-capacitive) based dual-band antenna is proposed for WiMAX and WLAN Applications. The designed antenna consists of a ring monopole antenna coupled with ELC resonator and partial rectangular ground plane, which is fed by 50Ω microstrip transmission line. ELC metamaterial modifies the current direction and yields dual-band characteristics. The band characteristics of the ELC metamaterial element are explained in detail. The proposed antenna with a compact size of 30 × 30 × 0.8 mm3 is fabricated on a FR-4 substrate of thickness of 0.8 mm, with relative dielectric constant εr= 4.4 and loss tangent tanδ = 0.002. The experimental results cover the bandwidth of 500 MHz (3.57-4.04 GHz) and 860 MHz (4.73-5.59 GHz) with a resonance frequency of 3.74 and 5.1 GHz, respectively, which is suitable for WiMAX and WLAN applications. [ABSTRACT FROM AUTHOR]