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This work investigates the mechanism of generation of undesired common-mode (CM) currents in differential-line interconnects with slight non-uniformity owing to imperfect production process. To this end, three different non-ideal configurations are considered, obtained by perturbation of an ideally-uniform differential interconnect composed of two microstrips. By resorting to modal analysis, the governing...
A method to obtain the effective characteristic impedance of transmission line in meshed-ground FPC is investigated. Above on plenty of data, through the least square method, a relationship between the characteristic impedance and structural parameters of FPC is proposed for common design, with which it is more convenient to design the structure after getting the characteristic impedance.
The analytical expression for the discrete complex wave impedance (DCWI) in the 1-dimensional method of finite-difference time-domain (FDTD) grid is derived and correlated against numerical results from FDTD simulation. The DCWI for each grid (i.e., coarse main grid and fine sub-grid) is used as the characteristic impedance of the equivalent transmission line representing that grid. Subsequently,...
In order to solve the problems of power line interference conduction emission test, this paper models and analyzes the power line interference using frequency-domain transmission line theory. Based on TLM and the model, this paper presents a fast computation method for conduction current and voltage distribution caused by common-mode and different-mode signal in power line.
EMC is primarily about limiting the amount of available EM energy capable of causing interference. If all else fails, the ability to absorb and convert into heat some of this energy is a very useful tool. Absorbers have been used extensively in EMC related applications for a long time e.g. in anechoic rooms. More recently, advances in technology have facilitated the design of thin, efficient absorbers...
In this paper, the possibility of extending the validity range of the transmission line theory in evaluating differential mode signals along two-wire lines above a ground plane is discussed through analysis and simulation. It is shown that, when the above-ground height of the two wires is larger than about twice their separating distance, the calculation of the characteristic impedance of the line...
This paper presents a new delayed model of two-conductor transmission lines with frequency-independent per-unit-length parameters. In particular, the line delay extraction problem is considered. By use of a dyadic Green's function macromodel method, the rational form of the open-end impedance matrix allows an easy identification of poles and residues, and a new technique for the extraction of the...
Practical implementations of the Van Veen Loop, or Large Loop Antenna (LLA), necessarily contain imperfections, especially those due to finite mechanical tolerances. We examine the effects on performance of non-commensurate constituent transmission lines and unequal terminating resistors in the internal network of an LLA. It is shown that the electric field rejection of the LLA is somewhat insensitive...
A passive and inherently stable Foster equivalent-circuit multiport representation for lossy transmission lines is presented. The convergence is accelerated by appropriate inductances, for which an exact closed-form expression is developed. The order number of the truncated modal circuit is estimated by a simple relation, according to the required signal bandwidth. The coupling of arbitrary external...
In recent years the operating speed of digital electronic systems has increased beyond one GHz. Challenges to the system design are electromagnetic compatibility and signal integrity issues. The electrical and computer engineering technology programs offer courses in digital and analog electronics, and communication circuits along with fundamentals of circuit analysis, signals and systems and electromagnetics...
As a rectangular enclosure with apertures can be represented by a waveguide with its termination short circuited, the shielding effectiveness of the enclosure is calculated by the transmission line model. The voltage along the transmission line is obtained analytically, and the calculated shielding effectiveness fits well to the previous reference. Slots in different shapes are discussed, and multimodes...
The common-mode characteristic impedance of a typical cable bundle has been suggested to be approximately 150 Ohms. However, standard test fixtures for BCI probes employ 50 Ohm coaxial ports. Here a representative injection probe (transformer) intended for bulk current injection applications is characterized experimentally in the frequency domain using a 2-port vector network analyzer and a standard...
In the area of EMC performance of electric motor drives, research is mainly focused on the EMC performance of inverter based drives. However, in most instances the soft starter is still an appropriate choice for motor control especially when accurate speed control of the load is not a specific requirement. The EMI generation of these converters has not been given the required importance, with only...
The paper introduces a novel method for modeling powerline channels. The methodology is based on the use of three conductor transmission line. The mutual component of the three conductor line is varied to embrace the effects of multipath and impedance mismatches in the powerline is iteratively factored into the model by comparing with the measured frequency response of the powerline channel, without...
An analytical formulation has been developed for shielding effectiveness calculation of rectangular enclosure with an off-center aperture. It deals with more general case including arbitrary located aperture and high frequency incident wave by making use of high-order TEmn mode transmission line model. The incident electromagnetic field impinges on the enclosure with arbitrary incident angle and polarization...
To clarify the electromagnetic compatibility (EMC) problems that related to the interconnection in the integrated circuit (IC) chip, transmission characteristics and electromagnetic coupling between wirings in the specially designed model transmission lines in IC chip were investigated. At first, model transmission lines, designed on the bear chip with the size of 4800 mum square, were created as...
This article aims to study the radiation leakage from shielded cables by pigtail effect. Theoretical analyses and experimental results are carried out to verify that pigtails from shielded cables do cause radiation leakage. Calculations of the radiation leakage are presented on the basis of transmission line theory and antenna theory. These calculations are simulated using Matlab program and the results...
The paper introduces a novel method for modeling powerline channels. The methodology is based on the use of three conductor transmission line. The mutual component of the three conductor line is varied to embrace the effects of multipath and impedance mismatches, without having any prior knowledge about them. In this way, the measured frequency response of the channel is finally reached. The method...
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