This work presents a new theoretical framework and prediction tool for multipactor
in multi-carrier systems. This is of capital importance for satellite
communication applications, which demand for higher number of channels
operating at high power levels. Such a tool may help to reduce, or completely
avoid, the risk of having an RF breakdown in operation, with the
subsequent loss of signal quality or even completely damage of the device.
Currently not much is known about multipactor for multi-carrier signals.
This Thesis throws light on some basic multipactor mechanisms such
as the electronic discharge build-up or its connection with signal distortion.
A new non-stationary multi-carrier theory, based on current statistical multipactor
studies, is presented. Unlike existing ones, this theory is able, for
the first time, to model both electron creation and absorption processes.
It constitutes the first multipactor theory for multi-carrier signals which is
able to fully characterize the electron dynamics, such as the time evolution
of the electronic density, as well as creation and absorption rates.
A prediction method, the quasi-stationary method, is proposed for the
automatic searching of the combination of carrier phases which yields the
lowest breakdown level. It is based on the non-stationary theory for singlecarrier
signals together with a genetic global optimizer. The quasi-stationary
prediction method returns the worst-case phase combination plus a breakdown
level for arbitrary multi-carrier signals with any number of carriers.
The quasi-statinary method has been assessed with experimental tests on
ad-hoc Ku-band rectangular waveguide samples with different multi-carrier
signals. Additionally, the results have been contrasted with the popular
20-gap-crossing rule. The quasi-stationary method yields much better prediction
accuracy than the 20-gap-crossing rule. Prediction errors for both
techniques have been found to be 1 dB and 4 dB, respectively.
The non-stationary theory is formulated for one-dimensional parallelplate
case, but in principle can be adapted to other geometries and signals,
which opens a future research line for extending it to more complex applications. / Anza Hormigo, S. (2014). Multipactor in Multicarrier Systems. Theory and Prediction [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/38761 / TESIS
| Identifer | oai:union.ndltd.org:upv.es/oai:riunet.upv.es:10251/38761 |
| Date | 14 July 2014 |
| Creators | Anza Hormigo, Sergio |
| Contributors | Boria Esbert, Vicente Enrique, Gimeno Martinez, Benito, Vicente Quiles, Carlos Pascual, Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions |
| Publisher | Universitat Politècnica de València |
| Source Sets | Universitat Politècnica de València |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis, info:eu-repo/semantics/acceptedVersion |
| Source | Riunet |
| Rights | http://rightsstatements.org/vocab/InC/1.0/, info:eu-repo/semantics/openAccess |
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