Research PaperNo Access

Compact Circular CSRR Loaded Koch Fractal Inspired Frequency Band Reconfigurable Antenna

Puspendu Bikash Saha

https://orcid.org/0000-0002-6657-0036

National Institute of Technology Agartala, Barjala, Jirania 799046, Tripura, India

E-mail Address: bikashsuccess@gmail.com

Corresponding author.

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Dibyendu Ghoshal

National Institute of Technology Agartala, Barjala, Jirania 799046, Tripura, India

E-mail Address: tukumw@gmail.com

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, and

Rajib Kumar Dash

National Institute of Technology Agartala, Barjala, Jirania 799046, Tripura, India

E-mail Address: rkdashece@gmail.com

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https://doi.org/10.1142/S0218126621500754Cited by:2 (Source: Crossref)

Abstract

A compact frequency band reconfigurable dual-mode antenna utilizing both Koch fractal geometry and circular complementary split ring resonators (CSRRs) is presented in this paper. The proposed antenna can be electrically switched into both dual- and single-band resonance modes. A Koch curve derivative novel fractal curve is used to design the patch boundary of the antenna. Two optimized circular CSRRs are loaded inside the antenna geometry to achieve double-band resonance. The antenna operates at both 5.1GHz (upper WLAN band) and 9.6GHz ( $X$ $X$ -band) in dual resonance mode and resonates only at 8GHz ( $X$ $X$ -band) in single resonance mode. A properly biased RF-range PIN diode placed at the slotted ground plane reconfigures the antenna in two operating modes by switching into its ON–OFF states. The antenna is fabricated on cost-efficient epoxy (FR-4) substrate consuming the maximum dimension of $0.34 λ \times 0.32 λ$ $0.34 λ \times 0.32 λ$ which is much more compact than the conventional rectangular patch antennas designed for similar bands. Stable radiation characteristics with reduced cross-polarization are achieved at all the resonant bands of the antenna. A prototype of the proposed antenna is fabricated and measured. The simulated results are in good agreement with the measured ones.

This paper was recommended by Regional Editor Piero Malcovati.

Keywords:

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