Vol. 75

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2018-11-13

Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas

By Shu Jia Chin, Mohamad Zoinol Abidin Abdul Aziz, Mohd Riduan Bin Ahmad, and Mohd Azlishah Othman
Progress In Electromagnetics Research M, Vol. 75, 179-191, 2018
doi:10.2528/PIERM18061405

Abstract

This paper presented the effects of Defected Waveguide Structure (DWS) toward wideband monopole antennas. Ultra-wideband (UWB) technology was introduced to support high data rate and maximum bandwidth utilization. Monopole antenna received great attention owing to its appealing features of planar in the structure and is easy to manufacture in miniaturized sizes. Yet, poor gain and directivity are always the drawbacks of the miniaturized antennas. It was found that there was no research work done on the monopole antenna design with DWS. Two wideband monopole antennas with a microstrip feed line and coplanar waveguide (CPW) feed line were proposed. Two waveguides with full copper and square DWS were designed at all the inner walls. Monopole antennas were then integrated in the waveguides. The antenna parameters studied were return loss, efficiency, gain, directivity and radiation pattern to investigate the effects of DWS toward monopole antennas. Both monopole antennas achieved wide bandwidth from 2.5 GHz to 11 GHz and higher efficiency of more than -2 dB. Monopole antennas with waveguide presented a narrower bandwidth from 6 GHz to 11 GHz but a significant directivity improvement of 5 dBi at a lower frequency of 4.5 GHz. Monopole antenna with square DWS demonstrated high directivity and gain in a wide bandwidth of 8.5 GHz. Higher gain was improved around 4 dB at the frequency of 4.5 GHz, and high efficiency of more than -2 dB was achieved. The DWS design served as a guide for future communication system based on the smart technology system.

Citation


Shu Jia Chin, Mohamad Zoinol Abidin Abdul Aziz, Mohd Riduan Bin Ahmad, and Mohd Azlishah Othman, "Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas," Progress In Electromagnetics Research M, Vol. 75, 179-191, 2018.
doi:10.2528/PIERM18061405
http://www.jpier.org/PIERM/pier.php?paper=18061405

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