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Cylindrical guided structures, such as coaxial lines or circular waveguides, have been widely adopted in microwave engineering, while study of electromagnetic band-gap (EBG) structures has become an interesting topic in the area. In this research, some studies are conducted through the EBG implemented on cylindrical guided structures, using a body-of- revolution finite difference time domain (BOR-FDTD)...
This paper presents some studies on electromagnetic wave propagation and absorption performance at boundary through an in-house developed solver based on a body-of-revolution finite-difference time-domain (BOR-FDTD) method. A generalized unsplit perfectly matched layer (U-PML) technique is incorporated with the solver. Time domain results on wave propagation through various structures, including parallel-plate...
In this paper, various planar printed microwave and photonic band-gap (PBG) filters have been designed and analyzed by applying the finite difference time domain method, together with an unsplit-anisotropic perfectly matched layer technique as treatments of boundary conditions. The implemented solver was first validated by comparing the computed data with those published in literature, and a good...
One of the current topics in computational electromagnetics is the study of electromagnetic band-gap (EBG) structures using planar printed transmission lines. In fact, structures using microstrip-line circuits have been comprehensively applied in recent years. However, studies involving transmission lines using the coplanar waveguide (CPW) have not been commonly conducted. In this paper, a number...
EM simulation and design of circuits based on thick substrates require appropriate processing of the simulated and measured results. The propagation characteristics of a PBG structure has been analysed using a "field-deembedding" approach. The PBG structure acts as an effective filter in suppressing the surface and substrate waves in the designed frequency band. An in-house non-uniform Finite...
In this paper, the well known Finite Difference Time Domain (FDTD) algorithm is utilized to design and analyze a number of planar printed microwave integrated circuits (MICs). Such designs and analyses are based on a developed FDTD computer solver. Prior to the designs, the solver has been validated through comparisons of its computed results with the ones which came from some analyzed structures...
A microstrip fed dual-frequency planar printed antenna (DF-PPA) is proposed. This antenna can operate in parallel at two distinct frequency bands that are commonly used in nowadays communication systems, viz., the GSM and DCS 1800, at the operating frequencies of 0.9 GHz and 1.8 GHz, respectively. To increase its compactness, the proposed antenna is operated in quart-wave mode by inserting the shorting...
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