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Nasreddine Ben Ahmed

Articles by Nasreddine Ben Ahmed
Create UWB Filters With Coaxial Cables

Ultrawideband (UWB) communications offers great promise for voice, video, and high-data-rate transmissions, although key components will be needed for such systems. One of those components is the bandpass filter. Although traditional bandpass filters are designed and fabricated in planar form, it is also possible to create a UWB version using coaxial cables and coupled structures. The design approach is straightforward and the filter design can be readily analyzed by means of commercial electromagnetic (EM) simulation software.

Form Microstrip Couplers With Shielded Membranes
Commercial electromagnetic (EM) simulation software can help in the analysis of a shielded-membrane microstrip coupler that is well suited for use in high-frequency applications.
Multilayer Microstrip Forms Tunable Bandstop Filters
These straightforward guidelines show how to design and analyze a new structure for tunable bandstop filters using multilayer microstrip with a metallic diaphragm.
Analyze EM Parameters Of Slotted Tube Couplers
This numerical method accounts for thickness effects in determining the coupling coefficient as well as the even- and odd-mode impedances for slotted tube couplers.
Analyzing A Resonator For MRI Applications
The use of commercial electromagnetic (EM) analysis software can help in the study of a slotted elliptical tube resonator (SER) that is well suited for use in high-resolution MRI systems.
Sliced Coaxial Cables Form Compact Couplers
These analytical expressions calculate the dimensions of coupled sliced coaxial cables used to form compact microwave couplers at characteristic impedances of 50 and 75 ?.
Design Coupled Microstrip Resonators For MRI
These numerical methods provide the means for determining the primary inductive and capacitive matrices for a high-Q coupled-microstrip-line TEM resonator suitable for MRI applications.
Design Directional Couplers For High-Power Applications
These guidelines show how to design and analyze asymmetrical rectangular directional couplers that are suitable for handling high power levels at microwave frequencies.
Analyzing EM Parameters For Shielded Bandline
By applying several analysis techniques, it was possible to develop a set of closed-form expressions to describe the electrical behavior of shielded symmetrical bandline.

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