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4×4 -Element Cavity Slot Antenna Differentially-Fed by Odd Mode Ridge Gap Waveguide

Title:

4×4 -Element Cavity Slot Antenna Differentially-Fed by Odd Mode Ridge Gap Waveguide

Beltayib, Abduladeem ORCID: https://orcid.org/0000-0002-8405-1811, Afifi, Islam ORCID: https://orcid.org/0000-0001-6519-0915 and Sebak, Abdel-Razik (2019) 4×4 -Element Cavity Slot Antenna Differentially-Fed by Odd Mode Ridge Gap Waveguide. IEEE Access, 7 . pp. 48185-48195. ISSN 2169-3536

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Official URL: http://dx.doi.org/10.1109/ACCESS.2019.2910254

Abstract

A differential feeding for a cavity slot antenna is presented. The proposed feeding is based on a simple mechanism rather than the traditional complex networks that suffer from high losses. It is based on exciting the first higher order mode (TE10) of the ridge gap waveguide (RGW) by enlarging the ridge width. This enlargement would excite some undesired even modes that are suppressed by inserting a vertical perfectly electric conducting (PEC) wall in the middle of the waveguide based on the concept of magic tee operation. The proposed 4 × 4 cavity slot antenna is implemented using substrate integrated waveguide (SIW) technology. Two horizontal slots on the top of proposed wide RGW, representing the differential feeding approach, are implemented to feed the cavity slot antenna. The slots couple the fields with same amplitudes and 1800 phase difference to the cavity. The electric fields of the two coupling slots have odd symmetry in the x-axis, and subsequently, uniform electric field distribution of the TE440 mode of a cavity can be excited. The 4/4 radiating slots are etched on the top of the cavity in a specific distribution to ensure having in-phase fields for broadside radiation with low-cross-polarization levels. The measurement and simulation results of the proposed cavity slot antenna are in a good agreement. The obtained results confirm that the proposed antenna achieves a relative bandwidth of 7.1% for -10-dB return loss, a gain of about 16.5 dBi, and a side lobe level about -17 dB in E-plane and -13.8 dB in H-plane. Moreover, the proposed antenna provides low cross-polarization levels (-35 dB in E-plane and -27 dB in H-plane) within the operating frequency band of 32.5 to 34.9 GHz. With this achieved low profile, high gain, and high efficiency of the proposed cavity slot antenna, it may have a great potential for millimeter-wave (MMW) applications.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Article
Refereed:Yes
Authors:Beltayib, Abduladeem and Afifi, Islam and Sebak, Abdel-Razik
Journal or Publication:IEEE Access
Date:2019
Funders:
  • Concordia Open Access Author Fund
Digital Object Identifier (DOI):10.1109/ACCESS.2019.2910254
Keywords:Ridge gap waveguide, high order mode, differential feeding network, symmetric radiation, low cross polarization level, millimeter wave, back cavity antenna, substrate integrated waveguide
ID Code:986104
Deposited By: KRISTA ALEXANDER
Deposited On:21 Nov 2019 20:14
Last Modified:21 Nov 2019 20:15

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