The Effects of lightning discharges on control & communication cables and antenna systems /

Download
2014
Civil, Anıl
In this work, lightning discharges and their effects on control & communication cables and antenna systems are investigated. The mechanism of lightning is described in detail and electric and magnetic fields created by lightning discharges are examined. An experimental test setup is designed and implemented in order to observe induced voltages on cables or antennas caused by lightning discharges. Test results are compared with each other and discussed in detail. Also, they are compared with theoretical findings. Effects of induced voltages on certain systems are studied. Moreover, some precautions to avoid the harmful effects of lightning are suggested.

Suggestions

Effects and characterisations of pulse electrodeposition parameters of silver in terms of scattering parameter and surface roughness for waveguides operating at high frequencies
Başaran, Caner; Karakaya, İshak (2021-01-01)
The signal quality of antennas and waveguides in the transmission of electromagnetic waves are very much dependent on the surface finish of these devices. Effects of pulse parameters on the surface properties of silver coatings of the copper substrates have been analysed in terms of surface roughness and S-parameter (scattering parameter). The duty cycle, frequency and average current density were used as three pulse parameters. Three levels were selected for each parameter in the experimental design. The s...
Analysis and design of passive microwave and optical devices using the multimode interference technique
Sunay, Ahmet Sertaç; Birand, Mehmet Tuncay; Department of Electrical and Electronics Engineering (2005)
The Multimode Interference (MMI) mechanism is a powerful toool used in the analysis and design of a certain class of optical, microwave and millimeter wave devices. The principles of the MMI method and the self-imaging principle is described. Using this method, NXM MMI couplers, MMI splitter/combiners are analyzed. Computer simulations for illustrating the "Multimode Interference Mechanism" are carried out. The MMI approach is used to analyze overmoded 'rectangular metallic' and 'dielectric slab' type of wa...
Design and implementation of VHF-UHF antenna with non-foster matching circuit
Aşcı, Cihan; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2018)
Matching networks are widely used in the antenna transmitter and receiver applications and thus they are an essential part of the RF system. Conventional passive matching networks are very broadly used for matching an antenna for a narrow band of frequencies; however, achieving a broad bandwidth characteristics for electrically–small antennas (ESAs) is not possible with the use of passive matching circuits. ESAs possess a large input reactance and the electrical size of the antenna element is very small com...
Analysis of spherical-rectangular printed antennas and antenna arrays using cavity model
Demir, Oğuz; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2017)
Printed antennas are commonly used since these antennas are preferred in many applications due to their advantageous properties. In order to employ these antennas in such applications, a thorough investigation and analysis are generally required. Although this can be implemented with fully numerical methods for the sake of high accuracy, the complex calculations required in the process lead to heavy computational load, hence generally demands high quality simulation software. In this thesis, the spherical-r...
Design of an FM-CW radar altimeter
Yetkil, Yaşar Barış; Demir, Şimşek; Department of Electrical and Electronics Engineering (2005)
Frequency modulated continuous wave (FM-CW) radar altimeters are used in civil and military applications. Proximity fuses, automatic cruise control systems of cars, radar altimeter of planes are examples to these applications. The goal of this thesis is to present a method for altitude determination using an FM-CW radar. For this purpose principles of radars and FM-CW systems are studied and related subjects are inspected. After this inspection, algorithms for altitude determination are evaluated. Consequen...
Citation Formats
A. Civil, “The Effects of lightning discharges on control & communication cables and antenna systems /,” M.S. - Master of Science, Middle East Technical University, 2014.