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Asymmetrically CPW-fed ladder-shaped fractal antenna for UWB applications

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Abstract

A compact asymmetrically CPW-fed ladder- shaped UWB fractal antenna is presented. An impedance bandwidth of 4.56–13.1 GHz is achieved by using four iterations of H-shaped radiating element, modified feed line, asymmetrical feeding and slot loaded ground plane. Omnidirectional radiation patterns are achieved in H-plane at all frequency points in the operating frequency band. The bidirectional nature of E-plane patterns at lower frequencies is observed to be shifted to directional nature at higher frequencies. The designed antenna structure has an average gain of 2.84 dB with a constant group delay. The designed antenna structure is analyzed for three different substrate materials i.e. CNT, Ni0.2Co0.2Zn0.6Fe2O4 and FR-4 epoxy. A good agreement is achieved between the simulated and measured results. This antenna structure has advantages of wider bandwidth and smaller dimensions over already reported ones.

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Acknowledgements

Sarthak Singhal is very thankful to the Ministry of Human Resource Development, Government of India, for providing the financial support in the form of teaching assistantship.

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Authors and Affiliations

  1. Department of Electronics Engineering, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh, 221005, India

    Sarthak Singhal & Amit Kumar Singh

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  1. Sarthak Singhal
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  2. Amit Kumar Singh
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Correspondence to Sarthak Singhal.

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Singhal, S., Singh, A.K. Asymmetrically CPW-fed ladder-shaped fractal antenna for UWB applications. Analog Integr Circ Sig Process 92, 91–101 (2017). https://doi.org/10.1007/s10470-017-0976-5

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  • DOI: https://doi.org/10.1007/s10470-017-0976-5

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