Abstract
This article presents a unique technique to enhance isolation between transmit/receive radiating elements in densely packed array antenna by embedding a metamaterial (MTM) electromagnetic bandgap (EMBG) structure in the space between the radiating elements to suppress surface currents that would otherwise contribute towards mutual coupling between the array elements. The proposed MTM-EMBG structure is a cross-shaped microstrip transmission line on which are imprinted two outward facing E-shaped slits. Unlike other MTM structures there is no short-circuit grounding using via-holes. With this approach, the maximum measured mutual coupling achieved is -60 dB @ 9.18 GHz between the transmit patches (#1 & #2) and receive patches (#3 & #4) in a four-element array antenna. Across the antenna’s measured operating frequency range of 9.12 to 9.96 GHz, the minimum measured isolation between each element of the array is 34.2 dB @ 9.48 GHz, and there is no degradation in radiation patterns. The average measured isolation over this frequency range is 47 dB. The results presented confirm the proposed technique is suitable in applications such as synthetic aperture radar (SAR) and multiple-input multiple-output (MIMO) systems.
Highlights
INTRODUCTIONIt has become a necessity to reduce the size of wireless communications systems
In recent years, it has become a necessity to reduce the size of wireless communications systems
This paper presents a unique technique to enhance isolation between transmit/receive radiating elements in densely packed array antenna by embedding a metamaterial (MTM) electromagnetic bandgap (EMBG) structure in the space between the radiating elements to suppress surface currents that would otherwise contribute towards mutual coupling between the array elements
Summary
It has become a necessity to reduce the size of wireless communications systems. Reducing the size of radiating elements in wireless systems has become an area of intense investigation. Numerous approaches have been investigated to reduce the mutual coupling between closely located antennas. Properties of EM bandgap have been exploited to reduce mutual coupling between antenna elements [17]–[24]. Unlike conventional mutual coupling reduction approaches, the proposed technique provides high isolation between radiating elements and the size of the array antenna remains unchanged. The antenna performance and mutual coupling were analysed using standard full-wave EM simulation tools and were validated by the measurements. To more validity of the proposed method the results extracted from the full wave EM simulator have compared with the circuit model, which show an excellent agreement with each other proving the precisely of the proposed approach
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
