A Modal Description of Multiport Antennas. (3rd October 2011)

• Record Type: Journal Article
• Authors: Lynch, Jonathan J.
• Other Names: Ferrando Miguel Academic Editor.
• Is Part Of: International journal of antennas and propagation. Volume 2011(2011)
• Publication Date: 2011-10-03
• Subjects: Electronic apparatus and appliances -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Antennes (Électronique); Ondes radioélectriques -- Propagation; Antennas (Electronics); Electronic apparatus and appliances; Radio wave propagation; Electronic journals; Periodicals; 621.382405
• DOI: 10.1155/2011/438437
• Languages: English
• ISSNs: 1687-5869

Abstract

Abstract : This paper presents a modal description of multiport antennas that leads directly to a rigorous network representation and simple quadratic expressions for gain, efficiency, and effective area. The analysis shows that the transmitting and receiving properties of anN element antenna array are exactly described by a2 N × 2 N element scattering matrix together with a set ofN orthonormal mode functions and accounts for effects such as mutual coupling, scattering, reflection, and losses. The approach is quite general, only requiring that the antenna be finite and reciprocal. The scattering network description simplifies accounting of power flow while retaining a close connection to the physical antenna characteristics. The orthonormal mode functions provide a complete basis for radiated and received fields, facilitating beamforming. The theory provides rigorous definitions of input-output signals and links them to the underlying electromagnetics in a straightforward manner.