Radiation characteristics of short unterminated transmission lines

Moongilan, Dheena

doi:10.1109/isemc.2009.5284638

Cited by 7 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coaxial cables behave like a monopole antenna if RF current flows outside of the outer shield [14]. The monopole antennas are an efficient radiator at quarter wavelength compared to frequencies lower than quarter wavelength.…”

Section: Resultsmentioning

confidence: 99%

Corona and arcing in power and RF devices

Moongilan¹

2009

2009 IEEE Symposium on Product Compliance Engineering

Self Cite

View full text Add to dashboard Cite

The electric field between the surfaces of two conductors exceeds a critical value, a self sustaining ionizing discharge that typically occurs between the closest surface areas called corona. The corona initiates arcing and the arcing can ignite fire. There is both power loss and generation of RF interference during corona. Under certain circumstances corona could shorten the service-life of electrical insulations. The corona due to high frequency is still a research topic. Some studies indicate that corona due to RF fields occur at lower voltages compared to power frequencies. If the onset of corona is minimized, the arcing in electronic and electrical systems would be automatically eliminated. This paper describes corona onset characteristics under temperature, pressure and humidity changes in AC, DC and RF circuits. The multipacting discharge phenomena that occur in high voltage high RF frequency circuits are discussed. A frequency domain technique for measuring corona onset also discussed. The corona due to AC power voltages is modeled as RC equivalent circuit and rise time of corona is computed.

show abstract

Section: Resultsmentioning

confidence: 99%

Corona and arcing in power and RF devices

Moongilan¹

2009

2009 IEEE Symposium on Product Compliance Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…For the EMC ground conductor's impedance (based on highest frequency that would be conducting through the grounding wire), in addition to meeting the PS requirement, , the length and size of wire is chosen so that the ground wires do not act as radiating antennas. Depending on the frequency and the length of the grounding wire, there are two regions that need to be considered: A linear region, where the radiation potential of a wire could be determined using trivial mathematics, and a non-linear region where rigorous mathematical computations [12,13] are necessary. The linear to non-linear region occurs at about 1/12 of the cable length.…”

Section: Length Of Grounding Wiresmentioning

confidence: 99%

Grounding architecture design for Wireless Base Stations — EMC and PS considerations

Moongilan¹

2012

2012 IEEE Symposium on Product Compliance Engineering Proceedings

Self Cite

View full text Add to dashboard Cite

Grounding facilitates the reduction in the electrical noise from electronic enclosures, improving the operational quality of circuits contained within the enclosures, and satisfying both the Product Safety (PS) and Electromagnetic Compatibility (EMC) requirements. An ideal PS ground of an electronic enclosure should be equipotential (near zero) with respect to the reference ground to minimize the electrical shock potential and to provide a quick drain path for fault currents. However, an EMC ground requires a potential-difference or controlled impedance between interconnected electrical components in order for noise currents to flow from one component to another and eventually should terminate on to a large, non-radiating electrically conductive surface area. To achieve the EMC emissions goal, the noise current flow should be from a smaller to a larger conductive surface area (i.e., higher to lower impedance) through controlled short interconnection ground paths.The interconnections are designed to prevent external electrical noise current from entering into the enclosure and to be as short as possible so that they do not become the radiators, noise couplers, or sources of ground loop oscillations. In this paper several EMC grounding architectures for interconnection of PCBs, backplanes, and card cages to enclosures for Wireless Base Stations are described in the form of signal flow graphs, and their potential for noise radiation and conduction is compared while still achieving the PS grounding compliance requirements.

show abstract

“…Radiated emissions from transmission lines have been known since the early 1900s [1] and they have been attributed to "common-mode currents" [2]. However, the mechanism that leads to the generation of these currents is not understood.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Radiation From Unbalanced Transmission Lines

McLain

2012

PIER B

View full text Add to dashboard Cite

Abstract-A theory for the electromagnetic radiation from unbalanced transmission lines is developed. It is shown that radiation results from the convection current that develops in unbalanced transmission lines where the resistances of the lines are unequal. The process that leads to the generation of the nonlinear convection current in unbalanced transmission lines is explained. It is proved that the classical transmission line theory is not valid for unbalanced lines. The convection current and the radiation forces are included in the transmission line equations to develop a generalized model valid for all twoconductor transmission lines. The generalized model is validated via comparisons of its numerical solutions with laboratory measurements.

show abstract

Radiation characteristics of short unterminated transmission lines

Cited by 7 publications

References 2 publications

Corona and arcing in power and RF devices

Corona and arcing in power and RF devices

Grounding architecture design for Wireless Base Stations — EMC and PS considerations

Electromagnetic Radiation From Unbalanced Transmission Lines

Contact Info

Product

Resources

About

Radiation characteristics of short unterminated transmission lines

Cited by 7 publications

References 2 publications

Corona and arcing in power and RF devices

Corona and arcing in power and RF devices

Grounding architecture design for Wireless Base Stations &#x2014; EMC and PS considerations

Electromagnetic Radiation From Unbalanced Transmission Lines

Contact Info

Product

Resources

About

Grounding architecture design for Wireless Base Stations — EMC and PS considerations