Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
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
Design of high power waveguide limiter /
Download
index.pdf
Date
2014
Author
Yılmaz, Abdullah
Metadata
Show full item record
Item Usage Stats
144
views
86
downloads
Cite This
Microwave limiters are protector structures. Microwave limiters protect the receiver circuits from high power microwave signals. Receiver circuits of radar systems are able to process the signals with low level amplitude. This situation results in usage of very sensitive circuit blocks. These sensitive circuit blocks, such as LNAs, are protected from high power signals by limiters. The causes of the undesired microwave signals with high level amplitude can be transmitter to receiver leakage and high power microwave short pulses coming from outside as an enemy attack. Transmitter leakages are predictable threats because transmitted signal timing is known. However threats from outside is unpredictable because the time of threat cannot be known. Outside threats can cause problem in the radar system at any time. In order to protect receiver channel of radar system, low response time high power microwave limiter must be used. In this study, two critical points are aimed. The limiter, which can handle the signals with kW power levels, and which have low response time is aimed. Two different single stage waveguide limiters, whose operating frequency bands are 9.4-10 GHz, are designed with two different high power pin diodes. Linear/Nonlinear measurements of waveguide limiters are performed. Then these two single stage limiters are connected in cascade and the resulting two stage waveguide limiter is measured. In order to increase the sensitivity and the response speed of the waveguide limiter, the waveguide detector is designed with the Schottky diode. The limiters are measured with the WG detector. Circuit designs and simulations are performed using AWR® and CST®.
Subject Keywords
Wave guides.
,
PIN diodes.
,
Microwave circuits.
,
Electronic circuits.
URI
http://etd.lib.metu.edu.tr/upload/12617889/index.pdf
https://hdl.handle.net/11511/23997
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Modelling and Precalculation of Additional Losses of Inverter Fed Asynchronous Induction Machines for Traction Applications
Muellner, F.; Neudorfer, H.; Schmidt, E. (2011-09-10)
The inverter supply of asynchronous induction machines for traction applications has a major influence on both electromagnetic and thermal performance. In addition asynchronous induction machines used with traction drives of rail transportation vehicles have different design strategies compared against commonly used standard machines. Generally, the design of these machines requires high electromagnetic and thermal stress. Thus, the additional losses caused by the inverter have to be considered with the ini...
Design and realization of high power low loss combiners
Suna, Gonca; Yıldırım, Nevzat; Department of Electrical and Electronics Engineering (2013)
In recent high power microwave systems, power generation is commonly achieved by combining a bunch of transistor amplifier. Regarding the efficiency of power combining operation, insertion loss of the combiner is a critical parameter. In this thesis, several low loss power combiners, namely, microstrip Wilkinson combiner in 6-18 GHz frequency range, suspended stripline branchline couplers in 16.5-17.5 GHz frequency range and finally, planar probe coaxial waveguide combiners in 8.5- 11.5 GHz and 15.5-17.5 GH...
DEVELOPMENT OF POLYMER MATRIX COMPOSITES WITH TUNABLE DIELECTRIC PROPERTIES
Özkaragöz, Nadire Nazlı; Dericioğlu, Arcan Fehmi; Department of Metallurgical and Materials Engineering (2022-2-08)
Ferroelectric materials are used in different applications because of their superior electrical and dielectric properties. Ferroelectric materials are polarized when an electrical field is applied to the material. This spontaneous polarization continues even if an electrical field is removed. BST (Barium Strontium Titanate) is one of the attractive ferroelectric materials which has a high dielectric constant and low dielectric loss tangent (tanδ). High dielectric constant and low loss tangent are necessary ...
Design and realization of a broad band antenna loaded with a metamaterial-inspired lens for subsurface microwave imaging applications
Yeşilyurt, Ömer; Sayan, Gönül; Department of Electrical and Electronics Engineering (2019)
Ultra-wideband antennas are critical sensors for microwave imaging. In this work, radiation performance of an antipodal Vivaldi antenna is enhanced by using a broadband metasurface lens structure in 1-6 GHz bandwidth. Radiation pattern for the lens integrated antenna is more directive due to electromagnetic properties of the metasurface lens. In order to create such a lens, electrically responsive metamaterial unit cells with high effective permittivity values are designed. As we want to obtain a broadband ...
X-band high power solid state RF switch
Güzel, Kutlay; Demir, Şimşek; Department of Electrical and Electronics Engineering (2012)
RF/Microwave switches are widely used in microwave measurement systems, telecommunication and radar applications. The main purposes of RF switches are Tx-Rx switching, band select and switching the signal between different paths. Thus, they are key circuits especially in T/R modules. Wideband operation is an important criterion in EW applications. High power handling is also a key feature especially for radars detecting long range. In this study, different types of high power solid state switches operating ...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
A. Yılmaz, “Design of high power waveguide limiter /,” M.S. - Master of Science, Middle East Technical University, 2014.