A compact CPW-fed wideband metamaterial antenna using Ω-shaped interdigital capacitor for mobile applications

• Published in: Microwave and optical technology letters Vol. 57; no. 11; pp. 2558 - 2562
• Main Authors: Mishra, Naveen, Gupta, Ashish, Chaudhary, Raghvendra Kumar
• Format: Journal Article
• Language: English
• Published: Blackwell Publishing Ltd 01-11-2015
• Subjects: Antennas; Bandwidth; Mathematical models; metamaterial antenna; Metamaterials; Microwaves; Noise levels; Wireless communication; Wireless networks; zeroth-order resonance; Ω-shaped interdigital capacitor
• ISSN: 0895-2477; 1098-2760
• DOI: 10.1002/mop.29402

ABSTRACT
In this article, a compact bandwidth enhanced CPW‐fed metamaterial antenna is presented. The band broadening is accomplished by combining the resonant modes (n = 0, 1, 2). The antenna is operated in series resonant mode, and therefore, resonant characteristics can be controlled effectively by varying series parameters. Coupling among patches are responsible for originating number of modes which is made nearer to the original mode (n = 0 mode) to enhance the bandwidth. Proposed antenna offers measured fractional bandwidth of 54.3% at 3. 41 GHz (center frequency). Ω (Ohm)‐shaped IDC is used to provide the series gap which improves impedance matching significantly. It is illustrated that the zeroth‐order resonating frequency depends on the series parameters by demonstrating the equivalent circuit model. The antenna has an average peak gain of 2.36 dB and average radiation efficiency of 92.81%, throughout the operating band (S11 < −10 dB). The proposed antenna has the advantages of simple fabrication, compactness, and omnidirectional radiation pattern makes it suitable for modern wireless communication such as WLAN/Wi‐Fi (2.4–2.49 GHz), WiMAX (2.5–2.69 GHz, 3.4–3.6 GHz), Bluetooth (2.4–2.48 GHz). Furthermore, prototype of the antenna is fabricated and measured and is in good agreement with the simulated one. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2558–2562, 2015