Compact slotted UWB monopole antenna with tuneable band-notch characteristics

Abstract

In this article, a compact slotted ultra‐wideband (UWB) monopole antenna with tuneable band‐notch characteristics for wireless local area network has been investigated. The proposed antenna includes a defected ground structure and a hexagonal radiating element. The notched frequency has been obtained by etching an inverted U‐shaped slot from the surface of the hexagonal radiator and by fine tuning of the slot dimensions. Analysis of simulated and measured results reveal that an impedance bandwidth of 2.8–11.1 GHz has been obtained with band‐notch characteristics centered at 5.2 GHz. The notch‐band frequency can be tuned to 5.5 GHz by appropriate choice of slot dimensions. Satisfactory results have been obtained on frequency and time‐domain analysis of the proposed structure. Simulated and measured results show a good agreement. Compactness, simplicity in design, and frequency tuning ability for notch‐bands justify the applicability of the proposed antenna in UWB communication systems.

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