Phased array antenna calibration and experimental validation

Yalım, Alper
In this thesis, nine different methods aiming calibration of Phased Array Antenna (PAA) and Multifunctional Radars which employ PAA are presented. Those calibration methods are described, procedures of the methods are explained in detail, and information about constraints and measurement restrictions of those methods is given. As one step further, comprehensive work is focused on Multi-Element Phase Toggling (MEP) method and Rotating Element Vector (REV) method. Results of simulations are shown, theoretical and practical aspects of calibration methods are analytically elaborated. MEP and REV methods are experimentally implemented on a phased array receiver. Results of indoor and outdoor measurements are also presented in the scope of this thesis.


Waveguide-based Monopulse Wideband Travelling-Wave Array
GULTEPE, Gokhan; DOGAN, Doganay; Aydın Çivi, Hatice Özlem (2017-07-14)
A novel, travelling-wave, waveguide antenna structure with monopulse capability in the two principal planes is proposed with increased frequency bandwidth. The array consists of two interleaved waveguide arrays which provide appropriate excitations to the antenna elements above the waveguide to generate proper sum and difference patterns. With the use of printed antennas and the elimination of the narrow frequency characteristics of the slots on the waveguides, the bandwidth of the array is greatly improved.
True-time delay structures for microwave beamforming networks in S-band phased arrays
Temir, Kaan; Demir, Şimşek; Department of Electrical and Electronics Engineering (2013)
True time delay networks are one of the most critical structures of wideband phased-array antenna systems which are frequently used in self-protection and electronic warfare applications. In order to direct the main beam of a wideband phased-array antenna to the desired direction; phase values, which are linearly dependent to frequency, are essential. Due to the phase characteristics of the true-time delay networks, beam squint problems for broadband phased array systems are minimized. In this thesis, diffe...
Analysis and design of active annular ring coupled circular patch antenna
Gebeşoğlu, Durmuş; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2017)
This thesis includes the design, production and measurement of the active, dual band annular ring coupled circular patch antenna. The dual band operation is achieved by using stacked patches. 3 dB hybrid is used to obtain circular polarization. Effects of antenna parameters on the input impedance and frequency ratio between the resonance frequencies are observed. Design has been achieved step by step. Firstly, dual band operation is investigated by using stacked patches. An annular ring antenna and a circul...
Analysis of dual - polarized aperture - coupled microstrip antennas with H-shaped slots and equivalent circuit modeling of H shaped slots
İşeri, Kadir; Alatan, Lale; Department of Electrical and Electronics Engineering (2012)
This thesis includes the design, production and measurement of a wideband dualpolarized X-band aperture-coupled microstrip patch antenna. The wideband and dual-polarized operation is achieved through the use of H-shaped coupling slots. Therefore, the equivalent circuit modeling of a microstrip line fed H-shaped slot is also studied in this thesis. A step-by-step procedure is followed during the design process of the dual-polarized aperture-coupled microstrip antenna. First, an aperture-coupled microstrip an...
Analysis of frequency diverse arrays for radar and communication applications
Çetintepe, Çağrı; Demir, Şimşek; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2015)
Frequency diverse array (FDA) concept is one particular manifestation of waveform diversity, a topic which gains popularity among the research community in response to pressing demands of modern radar and communication systems such as multiple tasks, capacity and security. Introduction of a set of waveforms to the elements of an array, with slight shifts in the carrier frequencies so to establish frequency diversity, leads to far-field patterns that are remarkably different from conventional phased arrays, ...
Citation Formats
A. Yalım, “Phased array antenna calibration and experimental validation,” M.S. - Master of Science, Middle East Technical University, 2013.