Employing EBG Structures in Multiantenna Systems for Improving Isolation and Diversity Gain

This letter investigates the effect of mutual coupling on the operation of a multiantenna system. Radiation pattern, input impedance, gain, and efficiency of a slot antenna in proximity of another slot antenna are studied through simulations. A mushroom-type electromagnetic band-gap (EBG) structure...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2009, Vol.8, p.1162-1165
Main Authors: Payandehjoo, K., Abhari, R.
Format: Article
Language:English
Subjects:
Antenna measurements
Antenna radiation patterns
Antennas
Coupling
diversity gain
Diversity methods
electromagnetic band-gap (EBG) structures
Electromagnetic coupling
Gain
Impedance
Metamaterials
multiantenna structures
multiple-input-multiple-output (MIMO) systems
Mutual coupling
Noise levels
Periodic structures
Prototypes
Reflectors
Reverberation chambers
Slot antennas
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Summary:This letter investigates the effect of mutual coupling on the operation of a multiantenna system. Radiation pattern, input impedance, gain, and efficiency of a slot antenna in proximity of another slot antenna are studied through simulations. A mushroom-type electromagnetic band-gap (EBG) structure is designed to isolate the antennas and reduce the influence of coupling on radiation characteristics. Two multiantenna prototypes are fabricated and experimentally evaluated. Measurement results confirm the improvement of isolation between the antennas by 28 dB at the radiation frequency of 5.2 GHz when the EBG reflector is utilized. In addition, the diversity gain of the two prototypes are measured using a reverberation chamber demonstrating an increase of 3.3 dB in the combined received power for 99% of transmission trials when the EBG structure is added in the substrate of the multiantenna system.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2009.2034877