Journal ArticleDOI
A time-domain physical optics heuristic approach to passive intermodulation scattering
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TLDR
In this paper, a nonlinear extension to the time-domain physical optics (TD-PO) is proposed, to take into account electromagnetic scattering at intermodulated frequencies when such a junction is illuminated by two impinging electromagnetic fields at different frequencies.Abstract:
Passive intermodulation (PIM) is a phenomenon which often arises at junctions between different materials. This may be a major issue in tightly packed antenna farms as those typically present on communication satellites. Here, an heuristic nonlinear extension to the time-domain physical optics (TD-PO) is proposed, to take into account electromagnetic scattering at intermodulated frequencies when such a junction is illuminated by two impinging electromagnetic fields at different frequencies. Simulation results are compared with measures to validate the model.read more
Citations
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Journal ArticleDOI
Passive intermodulation on large reflector antennas
TL;DR: In this article, an analytical model for the study of passive intermodulation (PIM) on large reflector antennas is presented, in particular for a satellite-communication antenna and for a radio-astronomy antenna.
Studies on microwave antennas: passive intermodulation distortion in antenna structures and design of microstrip antenna elements
TL;DR: Passive intermodulation (PIM) measurements of antennas and the design of dual-polarised microstrip antenna elements are investigated in this thesis and the concept of PIM near-field measurement is introduced and the implementation of the equipment for the GSM 900 frequency band is presented.
Journal ArticleDOI
Genetic algorithms for the determination of the nonlinearity model coefficients in passive intermodulation scattering
TL;DR: In this article, a genetic algorithm is introduced for the computation of the optimum values for these coefficients, which is relevant both for satellite communications and for radio-astronomical applications.
Journal ArticleDOI
Numerical Analysis of Passive Intermodulation Arisen From Nonlinear Contacts in HPMW Devices
TL;DR: In this paper, a novel field-circuit hybrid numerical method is proposed to analyze the passive intermodulation (PIM) caused by nonlinear contacts, where the electromagnetic field part is simulated by a self-developed time-domain finite integration theory, and the circuit part is modeled by a number of nonlinear lumped elements.
Journal ArticleDOI
Evaluation of Passive Intermodulation Using Full-Wave Frequency-Domain Method With Nonlinear Circuit Model
TL;DR: An equivalent circuit model coupled with full-wave frequency-domain method is proposed to solve the PIM problems of electrically large objects and the analysis of PIM on a reflector antenna illuminated by a practical horn demonstrates the usefulness of the method.
References
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Book
Principles of Optics
TL;DR: In this paper, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Principles of Optics
TL;DR: In this article, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Journal ArticleDOI
Time-domain physical-optics
En-Yuan Sun,W.V.T. Rusch +1 more
TL;DR: In this article, the concept of the frequency-domain physical-optics approximation to the time domain was extended to determine some significant properties of large reflector antennas, such as the effects of time-delayed mutual coupling between points on the surface.
Proceedings ArticleDOI
Current-induced aging of contact spots
TL;DR: In this paper, it was shown that the electric current itself can be responsible for degradation of the contact spots, leading to an accumulation of vacancies and cavities, and the electrical conductivity is gradually reduced.
Proceedings ArticleDOI
Experimental study of the conducting spots in aluminium contact interfaces
TL;DR: The electrical properties of a stationary electric contact are closely related to phenomena occurring in the very small contact spots of the interface as discussed by the authors, which indicates that the electrical conductivity of the contact spots has been reduced by the electrical stresses: the spots have aged.