Abstract
Characteristic mode analysis of metal only unit cells of periodic structures is performed using Method of Moments based formulation. Ewald’s transformation is incorporated for a fast and cost efficient solution and the advantages over spatial Green’s function are discussed. The influence of the unit cell size on the characteristic modes is demonstrated. Various metal-only reflectarray elements are compared and their radiation characteristics are interpreted using the theory of characteristic modes. It is shown that characteristic modes of the unit cell can help us to understand the radiation and scattering behavior of the unit cell and this physical insight can be used in periodic array unit cell design.
Highlights
The theory of characteristic mode (TCM) was introduced by Garbacz [1], in 1971 and redefined by Harrington and Mautz [2, 3]
Characteristic mode analysis is suitable for the analysis of periodic arrays such as phased array antennas, transmitarray antennas, reflectarray antennas and frequency selective surfaces
A microstip reflectarray unit cell has been analyzed using the characteristic modes and the modal reflection phases are discussed for the first time [11]
Summary
The theory of characteristic mode (TCM) was introduced by Garbacz [1], in 1971 and redefined by Harrington and Mautz [2, 3]. A microstip reflectarray unit cell has been analyzed using the characteristic modes and the modal reflection phases are discussed for the first time [11]. This work focuses on the analysis of several periodic unit cell elements for reflectarray and frequency selective surface (FSS) applications. Reflectarray antennas are made of periodic elements in varying shape and dimensions They combine desired characteristics of both phased arrays and reflectors [14]. Elements are usually printed on a dielectric substrate with one side metal cladding, metal-only solutions have been investigated [15, 16] In this respect, our primary focus is on the characteristic mode analysis of metal-only unit cell elements. Their reflection characteristics and characteristic modes are investigated.
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