Inverted Diamond-shaped Notched Substrate and Patch for High-frequency Interference on Ultra-wideband Antenna

Raed Abdulkareem Abdulhasan, Khairun Nidzam Ramli, Rozlan Alias, Lukman Audah, Abdul Rashid Omar Mumin

Abstract


Notches loaded on a patch antenna can affect significantly on the antenna impedance matching. Therefore, notching technique is an efficient way to reduce the electromagnetic interference with unwanted bands. In this paper, a novel inverted diamond‏-‏shaped closed-end slot on a substrate and vertex-fed printed hexagonal patch ultra‏-‏wideband antenna is proposed for high-frequency band rejection. This antenna is fed using coplanar waveguide, and it is optimised by veering several patch parameters which further improved the inter bandwidth at both the lower and upper bands. However, the centre-notched band is shifted from 6 GHz to 7.5 GHz by cutting the inverted diamond shape in a special process. The developed ultra-wideband antenna is verified by comparing the simulation results with the measurement results. The measured results with a fractional bandwidth of 133% have a good agreement with the simulation results 146%. Moreover, the measured radiation showed omnidirectional patterns.

Keywords


coplanar waveguide CPW, cut substrate, diamond-slot, hexagonal UWB antenna, high-frequency rejection,

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DOI: http://doi.org/10.11591/ijece.v7i6.pp2929-2935
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ISSN 2088-8708, e-ISSN 2722-2578