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
Broadband spatial power combining in coaxial medium
Date
2012
Author
Tanç, Zafer
Metadata
Show full item record
Item Usage Stats
347
views
0
downloads
Cite This
Microwave amplifiers having high output power are the essential components in many systems, such as radar and satellite communication. Although the structures generated by tube technologies fulfill the necessity of the required output power, the use of these amplifiers includes some critical drawbacks, one of which is the limited life of operation. Alternatively, solid-state amplifiers produced by transistor technology are preferred since they are high reliable devices. In order to provide the necessary output power, a certain number of the amplifying units are connected in parallel; thus, output powers of these units are combined and this combination is delivered to the output of a microwave-packaged module. In the thesis study, an amplifier design based on spatial power combining in coaxial medium is researched. High output power, broad bandwidth, high linearity and high combining efficiency are the most important purposes of the design. The technique used attains the mentioned aims by combining output powers obtained by 16 MMIC amplifiers in a coaxial transmission medium supporting TEM mode of propagation.
Subject Keywords
Amplifiers (Electronics).
,
Broadband amplifiers.
,
Microwave amplifiers.
URI
http://etd.lib.metu.edu.tr/upload/12620514/index.pdf
https://hdl.handle.net/11511/25947
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
X-band high power GaN power amplifier design and implementation
Işık, Ali İlker; Demir, Şimşek; Department of Electrical and Electronics Engineering (2016)
High frequency power amplifiers play a crucial role in design, development and overall performance of wireless communication systems. Demanding requirements of the power amplifiers require improvements in output power, efficiency and bandwidth. GaN devices attract high frequency power amplifier designers due to the superior material characteristics of GaN. In this thesis, a power amplifier operating at X-band is designed and realized using a GaN discrete bare die transistor. It provides over 15 W output pow...
Innovative approaches in Doherty amplifier design for higher efficiency and wider frequency bandwidth
Şahan, Necip; Demir, Şimşek; Department of Electrical and Electronics Engineering (2013)
In the first phase of this thesis, the design optimizations of the bias adapted Doherty power (BA-DPA) and asymmetric Doherty power amplifier (ADPA) are presented for maximum efficiency criteria in the high power region. BA-DPA is analyzed by a novel approach in terms of efficiency. The ideal efficiency characteristics of BA-DPA with different bias adaptation schemes are illustrated. The maximum conduction angle and periphery requirement of the class-C biased peaking power amplifier (PPA) to realize fully l...
Linearization of RF power amplifiers with memoryless baseband predistortion method
Kolcuoğlu, Turusan; Demir, Şimşek; Department of Electrical and Electronics Engineering (2011)
In modern wireless communication systems, advanced modulation techniques are used to support more users by handling high data rates and to increase the utilization efficiency of the limited RF spectrum. These techniques are sensitive to the nonlinear distortions due to their high peak to average power ratios. Main source of nonlinear distortion in transmitter topologies are power amplifiers that determine the overall efficiency and linearity of the transmitter. To increase linearity without sacrificing effi...
Design and realization of A 0.5-5 GHz cascaded feedback amplifier
Korkmaz, İbrahim Cem; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2015)
Wideband amplification is one of the most examined study areas in microwave engineering. In this thesis work, 2-stage amplifier operating in decade bandwidth of 0.5-5 GHz is designed, simulated and demonstrated using two different discrete transistors. Designed amplifier is based on cascaded feedback amplifier concept. In order to flatten the gain of the designed amplifier, feedback topology is applied to both stages. Primarily, first stage is designed and demonstrated with flat gain of 7.8±1.2 dB and minim...
Design and fabrication of a high gain, broadband microwave limiting amplifier module
Kılıç, Hasan Hüseyin; Demir, Şimşek; Department of Electrical and Electronics Engineering (2011)
Microwave limiting amplifiers are the key components of Instantaneous Frequency Measurement (IFM) systems. Limiting amplifiers provide constant output power level in a wide input dynamic range and over a broad frequency band. Moreover, limiting amplifiers are high gain devices that are used to bring very low input power levels to a constant output power level. Besides, limiting amplifiers are required to provide minimum small signal gain ripple in order not to reduce the sensitivity of the IFM system over t...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Z. Tanç, “Broadband spatial power combining in coaxial medium,” M.S. - Master of Science, Middle East Technical University, 2012.
