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.


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...
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.
Analysis and design of reactively loaded dual band microstrip antenna
Bayram, Caner; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2015)
This thesis includes the design, production and measurement of a reactively loaded microstrip patch antenna. The dual band and circular polarization operation are achieved through the use of narrow slots etched close to the radiating edges on a nearly square patch. During the design process, the effects of antenna parameters on the input impedance and axial ratio characteristics are investigated. A step-by-step procedure is followed during the design process. First, the dual band characteristic is investiga...
RF MEMS Based Millimeter Wave Phased Array for Short Range Communication
Bayraktar, Omer; Kobal, Enis; Sevinç, Yusuf; Cetintepe, Cagri; Comart, Ilker; Demirel, Kaan; Topalli, Ebru Sagiroglu; Akın, Tayfun; Demir, Şimşek; Aydın Çivi, Hatice Özlem (2015-05-17)
This paper presents millimeter wave phased array antenna for short range communication applications at 35 GHz. The antenna array is formed by 1 x 16 microstrip antipodal tapered slot antennas each connected to RF MEMS phase shifters for beam steering. The simulation and measurement results of the single antenna element are presented and the phase shifter structure to be used in the array is described in the paper. RF MEMS phase shifters are fabricated using an in-house surface micromachining process.
Citation Formats
A. Yalım, “Phased array antenna calibration and experimental validation,” M.S. - Master of Science, Middle East Technical University, 2013.