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Wide-band conversion of donut-shaped pattern to directive one by square-shaped pattern director antenna

Published online by Cambridge University Press:  02 November 2021

Seyed Jalil Hosseini Open the ORCID record for Seyed Jalil Hosseini [Opens in a new window]  and
Homayoon Oraizi Open the ORCID record for Homayoon Oraizi [Opens in a new window]
Seyed Jalil Hosseini*
Affiliation:
School of Electrical Engineering, Iran University of Science and Technology, Tehran 1684613114, Iran
Homayoon Oraizi
Affiliation:
School of Electrical Engineering, Iran University of Science and Technology, Tehran 1684613114, Iran
*
Author for correspondence: Seyed Jalil Hosseini, E-mail: jalil_seyedhosseini@elec.iust.ac.ir
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Abstract

In this paper, an antenna with 8 GHz (7–15 GHz) bandwidth is designed, simulated, fabricated, and measured. Commonly, for the effective use of electromagnetic sources, mode converters are used to transform donut-shaped patterns to directive patterns. This paper introduces a novel antenna called the pattern director antenna (PDA) that solves most problems associated with the azimuthally symmetric output modes of high-power microwave sources. The PDA accepts directly (without the need for mode conversion) an azimuthally symmetric generated mode of an electromagnetic source and converts it to radiate a directive pattern. For the proof of concept and validation of the design by simulations, the 3D printing technology [using polylactic acid (PLA)] is used to fabricate the PDA and measure its radiation patterns and return loss. The selected material is cheap and also environmentally friendly. The antenna was coated with aluminum to become a conductor. The gain is from 16.8 to 21.8 dB in the frequency range. The S11, main lobe deviation (MLD), and sidelobe level (SLL) are less than −15 dB, 2°, and −7 dB, in all frequency range, respectively. The simulation results are in good agreement with the measurement.

Keywords

pattern director antennamode converter antennawideband antennarectangular waveguidecoaxial waveguideelectromagneticsource
Type
Antenna Design, Modelling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 9 , November 2022 , pp. 1099 - 1106
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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