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Ultra-thin flexible fractal antenna for 2.45 GHz application with wideband harmonic rejection


Wahaj Abbas Awan, Niamat Hussain, Tuan Tu Le*

Source title: 
AEU - International Journal of Electronics and Communications, 110: 152851, 2019 (ISI)
Academic year of acceptance: 

This paper presents, the design, and characterization of a coplanar waveguide (CPW) fed ultra-thin, low-profile, and flexible fractal antenna with a wideband harmonic rejection for 2.45-GHz ISM band spectrum applications. The antenna consists of rectangular fractal patches and a stub, etched on a very thin substrate. The fractal patch is utilized to achieve miniaturization of 30% with respect to conventional quadrilateral patch antenna. A rectangular stub is introduced perpendicular to the feedline to minimize the harmonics over a wide frequency band 3.3–11.0 GHz. Simulated and measured results demonstrate that the antenna offers an operating band 2.276–2.72 GHz, which fully covers the ISM band (2.4–2.5 GHz). Along with this, the antenna exhibits promising radiation characteristics of omnidirectional gain around 2.2 dBi and radiation efficiency of better than 95%. The proposed antenna has a compact overall size of 0.24λo × 0.20λo × 0.0005λoo is the free-space wavelength at 2.45 GHz) along with other advantages, including ultra-thin geometry and wide harmonic rejection. These features make the proposed antenna become a potential candidate for ISM band applications.