Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Frequency and phase locking of oscillators and magnetrons
Download
index.pdf
Date
2018
Author
Salur, Işıl
Metadata
Show full item record
Item Usage Stats
112
views
80
downloads
Cite This
Phase control of oscillators is a method used to improve both frequency stability and phase noise. Despite magnetrons are simple and cost effective high power microwave generators, they suffer from frequency and phase instabilities. Therefore, array construction with magnetrons is a difficult task. Using injection locking method, phase control can be established, hence output stabilities of generators can be improved. As a result, output power signals of the locked magnetrons can be added in the radiation field without using a combiner. In this thesis, Adler’s injection locking theory is verified using a 300 MHz solid-state oscillator circuit with three locking configurations such as master-slave, peer-peer and self-locking. Phase and frequency locking is achieved for three cases. In the master-slave experiment, it is observed that phase noise of free-running oscillator, being locked to master oscillator, is improved about 11 dBc/Hz at 100 kHz offset. For peer-peer locking, an improvement of 3 dBc/Hz at 100 kHz offset and for self-locking, an improvement of 5 to 10 dBc/Hz at 100 kHz is observed according to the coaxial cable length. Observing the agreement between theory and application, an experimental setup for master-slave locking of two industrial magnetrons is proposed.
Subject Keywords
Magnetrons.
,
Noise
,
Oscillators.
URI
http://etd.lib.metu.edu.tr/upload/12622284/index.pdf
https://hdl.handle.net/11511/27395
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Synchronization of harmonic oscillators under restorative coupling with applications in electrical networks
Tuna, Sezai Emre (2017-01-01)
The role of restorative coupling on synchronization of coupled identical harmonic oscillators is studied. Necessary and sufficient conditions, under which the individual systems' solutions converge to a common trajectory, are presented. Through simple physical examples, the meaning and limitations of the theorems are expounded. Also, to demonstrate their versatility, the results are extended to cover LTI passive electrical networks. One of the extensions generalizes the well-known link between the asymptoti...
Structural Analysis of Synchronization in Networks of Linear Oscillators
Tuna, Sezai Emre (2022-07-01)
In undirected networks of identical linear oscillators coupled through dissipative and restorative connectors (e.g., pendulums undergoing small vibrations connected via dampers and springs), the relation between asymptotic synchronization and coupling structure is studied. Conditions on the interconnection under which synchronization can be achieved for some selection of coupling strengths are established. How to strengthen those conditions so that synchronization is guaranteed for all admissible parameter ...
Comparison of PWM and PFM induction drives ID in,egarding audible noise and vibration for household applications
Ertan, Hulusi Bülent (2004-11-01)
This paper is aimed at comparing the performance of pulse frequency modulation (PFM) and pulsewidth modulation (PWM) techniques regarding audible noise generated from inverter-driven induction motors. For the purpose of illustrating the performance of the two modulation techniques, a drive developed for washing machine applications is considered. First, the measured and simulated harmonic content of this inverter is compared with the measured harmonic spectrum of a three-phase input-output commercial variab...
Broadband analogue predistortion using a distortion generator based on two-stage RF mixer topology
Nesimoglu, Tayfun (2018-01-01)
An analogue predistorter using a distortion generator based on a two-stage radio frequency mixer topology is presented. The proposed distortion generator achieves fundamental signal cancellation without using a signal cancellation loop or a resonant circuit, thus it generates an error signal that predominantly consists of unwanted intermodulation distortion (IMD). Measurements are performed using multi-tones, WLAN- and Terrestrial Trunked Radio (TETRA)-modulated signals. Distortion generator provides high l...
Simultaneous phase and amplitude control using triple stub topology and its implementation using rf mems technology
Demir, Şimşek; Akın, Tayfun (United States Patent and Trademark Office, 2009-9-15)
This invention relates to techniques for controlling the amplitude and the insertion phase of an input signal in RF applications. More particularly, this invention relates to phase shifters, vector modulators, and attenuators employing both semi-conductor and RF microelectromechanical systems (MEMS) technologies.
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
I. Salur, “Frequency and phase locking of oscillators and magnetrons,” M.S. - Master of Science, Middle East Technical University, 2018.
