View in EDS

Metamaterial-loaded Circularly Polarized Quad-band SIW MIMO Antenna with Improved Gain for Sub-6 GHz and X-band Applications.

Saved in:
Bibliographic Details
Title: Metamaterial-loaded Circularly Polarized Quad-band SIW MIMO Antenna with Improved Gain for Sub-6 GHz and X-band Applications.
Authors: R., Anandan1 anandandscet@gmail.com, Sathyasri, Balasubramanian2 dr.sathyasrib@gmail.com, Sanapala, Ravi Kumar3 sravikumarece@smec.ac.in, Kamisetti, Prakash4 prakashkams@gmail.com
Source: Applied Computational Electromagnetics Society Journal. Aug2025, Vol. 40 Issue 8, p724-733. 10p.
Subject Terms: *METAMATERIAL antennas, *WIRELESS communications, *SUBSTRATE integrated waveguides, *CIRCULAR polarization, *METAMATERIALS
Abstract: This work presents a quad-band metamaterial-loaded cavity-backed substrate integrated waveguide (SIW) MIMO antenna engineered for sub-6 GHz communication standards such as 5G and WLAN, as well as X-band applications. The use of a cavity-backed SIW architecture enables reduced fabrication complexity and straightforward integration with planar circuits, supporting compact and efficient antenna design. The antenna structure incorporates a modified rectangular split ring resonator (RSRR) slot along with an open-ended rectangular slot embedded within the SIW cavity-backed radiator. This configuration generates four resonant bands operating at 2.4, 3.3, 5.0, and 7.0 GHz. To enhance radiation characteristics, modified RSRR-based metamaterial unit cells are placed along the y-direction in front of the radiating elements. These cells contribute significantly to gain enhancement and enable circular polarization at the designated frequencies. The proposed antenna demonstrates realized gains of 5 dB, 8 dB, 6 dB, and 5 dB at the respective bands, supported by a consistent radiation efficiency of approximately 88%. The antenna also exhibits a stable unidirectional radiation pattern across all operating frequencies, making it suitable for directional multi-port MIMO configurations. To suppress interelement interference, a cavity-backed parasitic structure is introduced, effectively reducing mutual coupling between radiators. Comprehensive MIMO performance analysis is carried out using standard metrics, including envelope correlation coefficient (ECC), total active reflection coefficient (TARC), channel capacity loss (CCL), and mean effective gain (MEG), confirming strong isolation and diversity capability. Experimental validation aligns closely with simulation results, establishing the proposed antenna’s reliability and potential for use in high-performance, multi-band wireless systems. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:This work presents a quad-band metamaterial-loaded cavity-backed substrate integrated waveguide (SIW) MIMO antenna engineered for sub-6 GHz communication standards such as 5G and WLAN, as well as X-band applications. The use of a cavity-backed SIW architecture enables reduced fabrication complexity and straightforward integration with planar circuits, supporting compact and efficient antenna design. The antenna structure incorporates a modified rectangular split ring resonator (RSRR) slot along with an open-ended rectangular slot embedded within the SIW cavity-backed radiator. This configuration generates four resonant bands operating at 2.4, 3.3, 5.0, and 7.0 GHz. To enhance radiation characteristics, modified RSRR-based metamaterial unit cells are placed along the y-direction in front of the radiating elements. These cells contribute significantly to gain enhancement and enable circular polarization at the designated frequencies. The proposed antenna demonstrates realized gains of 5 dB, 8 dB, 6 dB, and 5 dB at the respective bands, supported by a consistent radiation efficiency of approximately 88%. The antenna also exhibits a stable unidirectional radiation pattern across all operating frequencies, making it suitable for directional multi-port MIMO configurations. To suppress interelement interference, a cavity-backed parasitic structure is introduced, effectively reducing mutual coupling between radiators. Comprehensive MIMO performance analysis is carried out using standard metrics, including envelope correlation coefficient (ECC), total active reflection coefficient (TARC), channel capacity loss (CCL), and mean effective gain (MEG), confirming strong isolation and diversity capability. Experimental validation aligns closely with simulation results, establishing the proposed antenna’s reliability and potential for use in high-performance, multi-band wireless systems. [ABSTRACT FROM AUTHOR]
ISSN:10544887
DOI:10.13052/2025.ACES.J.400805