Reconfigurable Antennas and Antenna Arrays
  • Y. Yashchyshyn, K. Derzakowski, G. Bogdan, K. Godziszewski, D. Nyzovets, C. H. Kim, B. Park, „28 GHz Switched-Beam Antenna Based on S-PIN Diodes for 5G Mobile Communications,” IEEE Antennas and Wireless Propagation Letters, vol.17, no. 2, pp. 225-228, 2018
    doi: 10.1109/LAWP.2017.2781262 (click here download pre-print version)
  • Y. Yashchyshyn, J. Marczewski and D. Tomaszewski, “Investigation of the S-PIN Diodes for Silicon Monolithic Antennas With Reconfigurable Aperture,” in IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 5, pp. 1100-1106, May 2010.
    doi: 10.1109/TMTT.2010.2045523
    Abstract: Investigations of surface p-i-n (S-PIN) diodes developed for silicon monolithic antennas with reconfigurable aperture have been described. The main criteria for choosing a suitable substrate for the S-PIN diodes have been extensively discussed. Based on this analysis, it has been found that dedicated silicon-on-insulator (SOI) substrates meet the requirements of efficient and lossless wave propagation. Experimental results shown in this paper confirm the applicability of SOI substrates for manufacturing of electrically reconfigurable slot apertures. The results show that S-PIN diodes realized on SOI substrates are suitable for various microwave and millimeter-wave applications.
    keywords: {adaptive antenna arrays;aperture antennas;p-i-n diodes;substrates;adaptive antennas;antenna arrays;reconfigurable slot apertures;silicon monolithic antennas;silicon-on-insulator substrates;surface p-i-n diodes;Antenna arrays;reconfigurable aperture;surface p-i-n (S-PIN) diodes},
  • Y. Yashchyshyn, J. Marczewski, K. Derzakowski, J. W. Modelski and P. B. Grabiec, “Development and Investigation of an Antenna System With Reconfigurable Aperture,” in IEEE Transactions on Antennas and Propagation, vol. 57, no. 1, pp. 2-8, Jan. 2009.
    doi: 10.1109/TAP.2008.2009728
    Abstract: The concept and results of investigation of a waveguide slot antenna with reconfigurable aperture is presented. Solutions are based on the utilized semiconductor material, which allows one to design the electronically reconfigurable antennas. The key element of the reconfigurable antenna is a surface PIN (SPIN) diode whose conductivity changes proportionally to the plasma density. SPIN structures can be activated selectively and cause, in turn, the generation of the desired shapes of radiation pattern. It allows one to extend the function possibilities of waveguide slot antennas compared with the conventional one.
    keywords: {antenna radiation patterns;p-i-n diodes;slot antenna arrays;antenna system;plasma density;radiation pattern;reconfigurable aperture;semiconductor material;surface PIN diode;waveguide slot antenna;Antenna arrays;Antenna radiation patterns;Antennas and propagation;Aperture antennas;Conductivity;Frequency;Semiconductor waveguides;Slot antennas;Switches;Telecommunication switching;Reconfigurable antennas;semiconductors devices;slot arrays;traveling wave arrays},
  • Y. Yashchyshyn and J. W. Modelski, “Rigorous analysis and investigations of the scan antennas on a ferroelectric substrate,” in IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 2, pp. 427-438, Feb. 2005.
    doi: 10.1109/TMTT.2004.840779
    keywords: {antenna radiation patterns;barium compounds;beam steering;ferroelectric materials;filled polymers;microstrip antennas;particle reinforced composites;permittivity;powders;strontium compounds;200 V;Ba0.65Sr0.35TiO3;Ba0.65Sr0.35TiO3 powder;applied electric control dc bias field;ceramic-polymer composite;ferroelectric substrate;longitudinal currents;microstrip electrically controllable scan antenna;permittivity;radiation properties;transverse currents;Antennas and propagation;Beam steering;Dielectrics;Ferroelectric materials;Gratings;Millimeter wave technology;Optical control;Optical waveguides;P-i-n diodes;Semiconductor waveguides;Antenna theory;antennas;ferroelectric materials;integral equations;leaky-wave antennas;moment methods},
  • J. Modelski and Y. Yashchyshyn, “Null pattern synthesis of ferroelectric smart antennas,” Microwave Symposium Digest, 2001 IEEE MTT-S International, Phoenix, AZ, USA, 2001, pp. 467-470 vol.1.
    doi: 10.1109/MWSYM.2001.966932
    Abstract: In this paper, new method of null pattern synthesis of antenna arrays without phase shifters and attenuators has been presented. This concept is based on utilizing a voltage-controlled ferroelectric array, where the variable pattern of each antenna element is used to synthesize the array pattern with desired nulls.
    keywords: {adaptive antenna arrays;antenna radiation patterns;ferroelectric devices;antenna arrays;element variable pattern;ferroelectric smart antennas;null pattern synthesis;voltage-controlled ferroelectric array;Antenna arrays;Antenna radiation patterns;Ferroelectric materials;Mechanical variables control;Phase shifters;Phased arrays;Receiving antennas;Signal synthesis;Transmitting antennas;Voltage},
  • J. Modelski and Y. Yashchyshyn, “Voltage-controlled ferroelectric microstrip antenna for phased arrays,” Antennas and Propagation Society International Symposium, 2000. IEEE, Salt Lake City, UT, USA, 2000, pp. 506-509 vol.2.
    doi: 10.1109/APS.2000.875182
    Abstract: A new concept of microstrip antenna for phased arrays is proposed using a voltage-controlled ferroelectric thin tape in the multilayered structure. This paper presents the ferroelectric thin tape, its theoretical analysis and design. The results indicate that this concept has many advantages, is very practical and promising. It gives possibilities of several applications, e.g. in phased arrays and smart antennas.
    keywords: {adaptive antenna arrays;antenna phased arrays;ferromagnetic materials;microstrip antenna arrays;voltage control;ferroelectric materials;multilayered structure;phased arrays;smart antennas;voltage-controlled ferroelectric microstrip antenna;voltage-controlled ferroelectric thin tape;Antenna arrays;Antenna theory;Dielectric constant;Dielectric substrates;Ferroelectric materials;Microstrip antenna arrays;Microstrip antennas;Phased arrays;Temperature;Voltage},


Time-Modulated Antenna Array
  • G. Bogdan; Y. Yashchyshyn; M. Jarzynka, “Time-Modulated Antenna Array with Lossless Switching Network,” in IEEE Antennas and Wireless Propagation Letters , vol. 15, pp. 1827 – 1830
    doi: 10.1109/LAWP.2016.2538463
    Abstract: In this paper a novel architecture for a time– modulated antenna array (TMAA) based on single–pole double–throw (SPDT) switches is presented. The proposed TMAA has lossless switching network because there is no power loss during the OFF state. In addition to improved efficiency, this TMAA provides beam–scanning capabilities. Moreover, the proposed TMAA has a constant instantaneous directivity, which is favorable for some applications. The architecture has been implemented as an aperture–coupled patch antenna array and verified as a smart antenna in a digital wireless communication system
    keywords: {Amplitude modulation;Antenna arrays;Antenna measurements;Antenna radiation patterns;Ports (Computers);Signal to noise ratio;Switches;adaptive arrays;antenna ar- rays;antennas;beam steering;interference cancellation;wireless communication},
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  • Y. Yashchyshyn, K. Derzakowski, P. R. Bajurko, J. Marczewski and S. Kozłowski, “Time-Modulated Reconfigurable Antenna Based on Integrated S-PIN Diodes for mm-Wave Communication Systems,” in IEEE Transactions on Antennas and Propagation, vol. 63, no. 9, pp. 4121-4131, Sept. 2015.
    doi: 10.1109/TAP.2015.2444425
    Abstract: This paper concerns the study of the mm-wave reconfigurable antennas based on S-PIN diodes suitable for using in mm-wave communication systems. The investigated antennas were designed, fabricated, and subjected to the measurements in both steady and transient states. One selected antenna was incorporated into a wireless system to determine its suitability for operating in such a system as a time-modulated linear array. By means of appropriate switching of the antenna, multiple radio frequency (RF) chains were simulated in a receiver having only one RF chain. This allowed applying a combining technique for improving the system performance in a presence of a strong interfering signal.
    keywords: {adaptive antenna arrays;millimetre wave antenna arrays;modulation;multifrequency antennas;p-i-n diodes;radiocommunication;switching;antenna switching;integrated S-PIN diodes;mm-wave communication systems;mm-wave reconfigurable antennas;multiple radio frequency chain;steady states;time-modulated linear array;time-modulated reconfigurable antenna;transient states;wireless system;Antenna measurements;Antenna radiation patterns;Radio frequency;Silicon;Slot antennas;Switches;Interference cancelling;SOI substrate;interference cancelling;millimeter wave;reconfigurable antennas;silicon on insulator (SOI) substrate;surface p-i-n diodes;time modulated array;time-modulated array},
  • G. Bogdan, P. R. Bajurko and Y. Yashchyshyn, “Null-steering in two-element time modulated linear antenna array through pulse-delay approach,” Microwaves, Radar, and Wireless Communication (MIKON), 2014 20th International Conference on, Gdansk, 2014, pp. 1-4.
    doi: 10.1109/MIKON.2014.6899831
    Abstract: This paper presents results of investigation on the radiation pattern generated with two-element Time Modulated Linear Array with single SP4T microwave switch. Utilization of SP4T switch instead of multiple SPST switches reduced an amount of power dissipated in matched loads and increased total efficiency. Due to the pulse-delay approach the null of radiation pattern has been continuously steered in a wide range of angles.
    keywords: {antenna radiation patterns;linear antenna arrays;microwave switches;SP4T microwave switch;SPST switches;matched loads;null-steering;power dissipation;pulse-delay;radiation pattern;two-element time modulated linear antenna array;Arrays;Delays;antenna arrays;beamforaiing;null-steering;time modulated linear arrays},


sub-Terahertz Science and Technology
  • N. A. Andrushchak, I. D. Karbovnyk, K. Godziszewski, Y. Yashchyshyn, M. V. Lobur and A. S. Andrushchak, “New Interference Technique for Determination of Low Loss Material Permittivity in the Extremely High Frequency Range,” in IEEE Transactions on Instrumentation and Measurement, vol. 64, no. 11, pp. 3005-3012, Nov. 2015.
    doi: 10.1109/TIM.2015.2437631
    Abstract: In this paper a new interference technique for material permittivity determination in the extremely high frequency range using a vector network analyzer is described. The novelty of this technique is the absence of a reference interference channel and there is no need to rotate the experimental sample that simplifies the measurement process and increases its accuracy. In order to approve this technique, the respective experimental setup was designed. The setup structure and theoretical background of interference fringe minimum formation were described. Based on the quasi-optical principle of the setup operation, the formula for the calculation of the material permittivity was derived. Two different dielectric materials were subjected to test measurements using the created experimental setup. Obtained average values of permittivity in the 50÷70 GHz range are ε = 10.67 ± 0.09 and ε = 2.35 ± 0.03 for sapphire and optical glass, respectively. For the purposes of result verification, the time-domain processing technique was also applied to calculate the permittivity of these materials. Besides, the obtained data are compared with those reported in the literature.
    keywords: {dielectric materials;network analysers;permittivity measurement;time-domain analysis;dielectric materials;extremely high frequency range;interference technique;material permittivity determination;time-domain processing technique;vector network analyzer;Accuracy;Electromagnetic radiation;Frequency measurement;Interference;Lenses;Permittivity;Permittivity measurement;EHF range;Interference technique;Vector Network Analyzer.;material permittivity;vector Network Analyzer},