Dmitry Zelenchuk | Queen's University Belfast (original) (raw)
Address: Belfast, Northern Ireland, United Kingdom
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Papers by Dmitry Zelenchuk
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
In this paper we investigate by numerical simulation the effect that various size metal objects p... more In this paper we investigate by numerical simulation the effect that various size metal objects placed within a reverberant environment have on spatial and temporal focussing when differential and non-differential time reversal is applied. A direct then a differential time reversal method at 2.4 GHz under RF pulse excitation is discussed. The results show spatial compression is achieved to within a radius of λ/2 distance around the source position and width of the compressed pulse remains constant regardless of the time reversal method and size and position of the cluttering elements. The use of the differential time domain method is preferential when small objects are detected as they occur away from direct line of sight between the transmitter and time reversal mirror. Such objects induce higher magnitude changes then when the direct time reversal method is used. It is also shown that the presence of such inclusions cannot be easily identified through calculation of the RMS delay spread of the object loaded cavity. This implies that the differential time domain method would be useful for non-evasive identification of dynamically evolving changes within a reverberant environment, e.g. for crack detection in pipes.
10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004., 2004
ABSTRACT
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
We show how a high disp right/left-handed (CRLH) metamaterial leaky be operated both for scanning... more We show how a high disp right/left-handed (CRLH) metamaterial leaky be operated both for scanning surveillance an The antenna presented, unlike previous lea antennas, requires only a narrowband fre range, 450MHz for -68 0 to +27 0 scanning inclu 2GHz center frequency operation. A design antenna synthesis is presented and experimen a 2GHz antenna are presented. The resulti find application in RFID localization equipme Index Terms-leaky wave antenna, me location.
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
A correlation interferometer working with a cooperation target operating at 2.2GHz center frequen... more A correlation interferometer working with a cooperation target operating at 2.2GHz center frequency is presented. This simplified interferometer presented here uses a lock-in amplifier to significantly increase system sensitivity when used in conjunction with a co-operating target signaling using amplitude modulation. The system is verified by detecting the angular velocity of passing tagged target. Experimental results show detectable range up over 110 meters in a multipath environment using a 10dBm EIRP tag.
International Conference on Mathematical Methods in Electromagnetic Theory, 2002
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
The effect of polarisation diversity on communications in a multipath environment is investigated... more The effect of polarisation diversity on communications in a multipath environment is investigated in the paper. It is shown for the first time that multipath and polarisation rotation effects are much less pronounced for the phase conjugation assisted communication case than for the conventional case and that the former yields gain of more than 9dB over the latter for any combination of propagation polarisation. Thus phase conjugated assisted augmentation of a conventional communication system offers the prospect for more robust communications in propagation hostile environments such as urban canyons.
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
For the first time application of the phase conjugation assisted radar to through-wall target loc... more For the first time application of the phase conjugation assisted radar to through-wall target localization is investigated in the paper. It is demonstrated that both single and multiple targets can be localized using the technique despite high wall reflectivity and moderate losses.
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
This paper presents an approach to improve the detection of an artificial target with low radar c... more This paper presents an approach to improve the detection of an artificial target with low radar cross-section in presence of clutter. The target proposed in the paper modulates the phase response of the circularly polarized incident signal by means of rotation. The same physical phenomenon can be used to steer the modulated response in a non-specular direction. The bi-static measurements of the response of the target have demonstrated good agreement with theoretical prediction as well as with full-wave simulation.
Journal of Communications Technology and Electronics
ABSTRACT
Journal of Communications Technology and Electronics
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
In this paper we investigate by numerical simulation the effect that various size metal objects p... more In this paper we investigate by numerical simulation the effect that various size metal objects placed within a reverberant environment have on spatial and temporal focussing when differential and non-differential time reversal is applied. A direct then a differential time reversal method at 2.4 GHz under RF pulse excitation is discussed. The results show spatial compression is achieved to within a radius of λ/2 distance around the source position and width of the compressed pulse remains constant regardless of the time reversal method and size and position of the cluttering elements. The use of the differential time domain method is preferential when small objects are detected as they occur away from direct line of sight between the transmitter and time reversal mirror. Such objects induce higher magnitude changes then when the direct time reversal method is used. It is also shown that the presence of such inclusions cannot be easily identified through calculation of the RMS delay spread of the object loaded cavity. This implies that the differential time domain method would be useful for non-evasive identification of dynamically evolving changes within a reverberant environment, e.g. for crack detection in pipes.
10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004., 2004
ABSTRACT
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
We show how a high disp right/left-handed (CRLH) metamaterial leaky be operated both for scanning... more We show how a high disp right/left-handed (CRLH) metamaterial leaky be operated both for scanning surveillance an The antenna presented, unlike previous lea antennas, requires only a narrowband fre range, 450MHz for -68 0 to +27 0 scanning inclu 2GHz center frequency operation. A design antenna synthesis is presented and experimen a 2GHz antenna are presented. The resulti find application in RFID localization equipme Index Terms-leaky wave antenna, me location.
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
A correlation interferometer working with a cooperation target operating at 2.2GHz center frequen... more A correlation interferometer working with a cooperation target operating at 2.2GHz center frequency is presented. This simplified interferometer presented here uses a lock-in amplifier to significantly increase system sensitivity when used in conjunction with a co-operating target signaling using amplitude modulation. The system is verified by detecting the angular velocity of passing tagged target. Experimental results show detectable range up over 110 meters in a multipath environment using a 10dBm EIRP tag.
International Conference on Mathematical Methods in Electromagnetic Theory, 2002
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
The effect of polarisation diversity on communications in a multipath environment is investigated... more The effect of polarisation diversity on communications in a multipath environment is investigated in the paper. It is shown for the first time that multipath and polarisation rotation effects are much less pronounced for the phase conjugation assisted communication case than for the conventional case and that the former yields gain of more than 9dB over the latter for any combination of propagation polarisation. Thus phase conjugated assisted augmentation of a conventional communication system offers the prospect for more robust communications in propagation hostile environments such as urban canyons.
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
For the first time application of the phase conjugation assisted radar to through-wall target loc... more For the first time application of the phase conjugation assisted radar to through-wall target localization is investigated in the paper. It is demonstrated that both single and multiple targets can be localized using the technique despite high wall reflectivity and moderate losses.
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
This paper presents an approach to improve the detection of an artificial target with low radar c... more This paper presents an approach to improve the detection of an artificial target with low radar cross-section in presence of clutter. The target proposed in the paper modulates the phase response of the circularly polarized incident signal by means of rotation. The same physical phenomenon can be used to steer the modulated response in a non-specular direction. The bi-static measurements of the response of the target have demonstrated good agreement with theoretical prediction as well as with full-wave simulation.
Journal of Communications Technology and Electronics
ABSTRACT
Journal of Communications Technology and Electronics