Band-stop filters (BSFs) are presented using novel designs of electromagnetic bandgap (EBG) structures and its improved structure with compact sizes on coplanar waveguide (CPW) transmission line. An equivalent lumped ...
详细信息
Band-stop filters (BSFs) are presented using novel designs of electromagnetic bandgap (EBG) structures and its improved structure with compact sizes on coplanar waveguide (CPW) transmission line. An equivalent lumped circuit is introduced to model the EBG unit cell. The BSFs are then designed by cascading EBG cells. Sharp selectivity and deep attenuation levels are shown on the stop band. It reveals a 20 dB stop band with a bandwidth of 2.3 GHz. The pass-band insertion loss is less than 0.6 dB.
Equilateral triangular complementary split ring resonators which is substituted for the Koch-fractal curves is used to the composite right/left-handed transmission lines, and the resonant frequency is reduced by 22% a...
详细信息
Equilateral triangular complementary split ring resonators which is substituted for the Koch-fractal curves is used to the composite right/left-handed transmission lines, and the resonant frequency is reduced by 22% and 34% respectively when 1 and 2 order Koch-fractal curves complementary split ring resonators are applied. The equivalent circuit model of the structure is presented and the electrical parameters are also extracted. It is observed that the simulation, circuit model and measurement results are consistent with each other, which demonstrates the correctness of the proposed structure.
The interaction of transient electromagnetic field due to HEMP with multicore buried power distribution cables is studied in this paper. Using transmission line analysis, the induced current on the shield of the cable...
详细信息
The interaction of transient electromagnetic field due to HEMP with multicore buried power distribution cables is studied in this paper. Using transmission line analysis, the induced current on the shield of the cable is computed. The cable transfer impedance is used to find the coupled current in the inner circuit. The variation of the current induced on the inner conductor as a function of the distance along the length of the cable is computed. The influence of the depth of burial of the cable on the induced current is evaluated to determine the soil attenuation effects.
This paper describes an accurate method to discretize the Dirichlet-to-Neumann boundary operator for a convex polygonal conductor. The technique is based on an expansion of the boundary value of the current density. B...
详细信息
This paper describes an accurate method to discretize the Dirichlet-to-Neumann boundary operator for a convex polygonal conductor. The technique is based on an expansion of the boundary value of the current density. Because the corresponding expansion functions exhibit the exact current behavior inside the conductor, they ensure a very good accuracy up to skin effect frequencies. In combination with a classical boundary integral method and the Method of Moments, the Dirichlet-to-Neumann technique allows for a direct determination of the resistive and inductive properties of transmission line configurations constructed from these conductors, as is illustrated with some numerical examples.
In this paper, an improved two-dimensional finite-difference time-domain (2-D FDTD) model has been proposed for extracting the attenuation constant of the uniform lossy transmission line. Compared with the reported me...
详细信息
In this paper, an improved two-dimensional finite-difference time-domain (2-D FDTD) model has been proposed for extracting the attenuation constant of the uniform lossy transmission line. Compared with the reported methods, the developed model is reliable and precise and the precise result can be achieved fast. As an example, the attenuation constant of a lossy microstrip line is extracted to perform the proposed method. The unique characteristic comes from the automatic convergence ability of the improved 2-D FDTD model.
This paper proposes a practical approach for developing a new class of compact slow-wave coplanar waveguide (CPW) series/shunt stubs, which offer 40% reduction in size relative to a conventional design. It demonstrate...
详细信息
This paper proposes a practical approach for developing a new class of compact slow-wave coplanar waveguide (CPW) series/shunt stubs, which offer 40% reduction in size relative to a conventional design. It demonstrates that the technique using interdigitated capacitive loading can provide size and cost reductions, while also providing performance enhancements. In comparison to conventional λ g /4 CPW stubs, these stubs offer better return loss and more compact structures. The experimental prototypes presented in this paper demonstrate the validity of the design method and the ability to print interdigitated capacitors inside the center conductor of the series/shunt stubs. The principle of achieving such high-quality circuits is detailed and is also confirmed by theoretical and experimental results, which are in reasonable agreement up to at least 70 GHz.
Shielded CPW transmission lines are promising candidates for the development of high-quality factor's transmission lines in millimetre-wave frequency bands, from about 10 GHz to more than 65 GHz. In this paper, st...
详细信息
Shielded CPW transmission lines are promising candidates for the development of high-quality factor's transmission lines in millimetre-wave frequency bands, from about 10 GHz to more than 65 GHz. In this paper, state-of-the art experimental results carried out on a CMOS 0.35 μm low-cost technology are first presented. These results open new possibilities for the development of low-loss compact passive circuits. Then, in order to minimize the simulation time and computer's memory need, a simple simulation approach is validated. The simulation of classical and grounded CPW transmission lines is sufficient in order to accurately simulate the behaviour of S-CPW transmission lines, leading to very fast design procedures.
The application of network methods to electromagnetic field problems can contribute significantly to problem formulation and to an efficient solution methodology. Lumped element representation of electromagnetic struc...
详细信息
The application of network methods to electromagnetic field problems can contribute significantly to problem formulation and to an efficient solution methodology. Lumped element representation of electromagnetic structures consisting of inductors, capacitors, resistors and exciting sources embedded in a connection circuit with ideal transformers are revisited. Applying Richards transformation, inductors and capacitors are replaced by shorted and open transmission line stubs, yielding a time-discrete transmission line segment circuit (TLSC) approach for efficient time-domain modeling of electromagnetic structures.
This paper describes the development of a digital computer model representing the main electric transmission system in Oman. A commercially available DIgSILENT power system computation package is employed. A brief des...
详细信息
This paper describes the development of a digital computer model representing the main electric transmission system in Oman. A commercially available DIgSILENT power system computation package is employed. A brief description of system is given, which includes generating units, transformers, transmission lines and loads. The system is connected with a number of internal industrial plants to exchange electric power in addition to the interconnection between Oman and UAE. The model is used to perform computer studies such as load flows, short circuit analysis, stability, transient responses, etc. The simulation results are used for evaluating system performance and strategic planning purposes. Sample results are presented to show the capabilities of developed model.
Based on microwave C-sections, rat-race coupler is designed to have a dual-band characteristic and a miniaturized area. The C-section together with two transmission line sections attached to both of its ends is synthe...
详细信息
Based on microwave C-sections, rat-race coupler is designed to have a dual-band characteristic and a miniaturized area. The C-section together with two transmission line sections attached to both of its ends is synthesized to realize a phase change of 90deg at the first frequency, and 270deg at the second passband. The equivalence is established by the transmission line theory, and transcendental equations are derived to determine its structure parameters. Two circuits are realized in this presentation; one is designed at 2.45/5.2 GHz and the other at 2.45/5.8 GHz. The latter circuit occupies only 31% of the area of a conventional hybrid ring at the first band. It is believed that this circuit has the best size reduction for microstrip dual-band rat-race couplers in open literature. The measured results show good agreement with simulation responses.
暂无评论