Designing Cavity–Backed Slot Antenna Array: A Numerical Implementation Using ADI-FDTD Method

Nyaory GM, Konditi DBO, Ouma HA, Musyoki S. "Designing Cavity–Backed Slot Antenna Array: A Numerical Implementation Using ADI-FDTD Method.". In: 6th JKUAT Scientific and Technological Conference. AICAD, Juja, Nairobi ; 2011.

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ABSTRACT Slotted antenna arrays used with waveguides also known as Cavity-backed slot antenna arrays (CBSAA) are a popular set of antenna in navigation, radar and other microwave-frequency systems. For such antenna analysis and design in the sub-wavelength domain, there are currently three well established methods: The method of moments (MoM), the finite-element method (FEM) and the finite difference time-domain method (FDTD).
In this paper, a new finite-difference time-domain (FDTD) algorithm is proposed in order to eliminate the Courant–Friedrich–Levy (CFL) condition restraint. We therefore present the conventional alternating direction implicit - finite difference time-domain method (ADI-FDTD) method.
The proposed ADI-FDTD method is applied by solving Maxwell’s equations in time domain. We model and simulate waveguide structures with a case study of T10 mode on rectangular CBSAA consisting of 8 slot elements backed by a single cavity and simple feed network. The characteristics covering the microwave frequencies are analyzed, for instance; input impedance, return loss, bandwidth, VSWR, and far field radiation patterns. Moreover, several numerical results are presented, along with measured data, which demonstrate the validity, efficiency, and capability of the technique. Index Terms - Cavity-Backed Slot Antenna Arrays (CBSAA), Finite Difference Time-Domain (FDTD), Courant–Friedrich–Levy (CFL), and Alternating Direction Implicit (ADI)

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