yusuf Sevinc - Academia.edu (original) (raw)
Papers by yusuf Sevinc
2015 9th European Conference on Antennas and Propagation (EuCAP), 2015
This paper presents millimeter wave phased array antenna for short range communication applicatio... more This paper presents millimeter wave phased array antenna for short range communication applications at 35 GHz. The antenna array is formed by 1 × 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.
2010 10th Mediterranean Microwave Symposium, 2010
A novel method is presented for electrically tuning the frequency of a compact RFID tag antenna. ... more A novel method is presented for electrically tuning the frequency of a compact RFID tag antenna. A tuning circuit, comprising an RF switch and discrete passive components, has been completely integrated into the antenna element, which is thus free of dc wires. The low-profile printed antennas are fabricated together with the layouts of its DC control circuits and other RF/base-band circuit footprints. A surface mounted (SMT) varactor is applied as a frequency-tuning element at proper places of the meandered slots in compact antenna. Prototype designs show the in-band frequency (return loss is <10 dB) is tunable from 2.4 GHz to 2.8 GHz when the bias voltage varies from 4V to 7 V. The impact of the tuning circuit on the antenna's return loss and radiation pattern have been experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex compact structures as well as other types of antennas to give enhanced electrical performance.
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015
16 × 16 phased array antenna composed of microstrip antipodal tapered slot antenna elements is de... more 16 × 16 phased array antenna composed of microstrip antipodal tapered slot antenna elements is designed at Ka-band. The array element is designed by using infinite array simulations to approximate the mutual coupling effects to obtain good input match for various beam steering angles in the final array. A circular rim with ground plane is added to the final array to suppress grating lobes appear when the beam is steered. It is shown by simulations that grating lobe is suppressed to a level less than -20 dB at 35 GHz.
Frequency multiplexer structures are of a crucial role as an essential part of huge variety of co... more Frequency multiplexer structures are of a crucial role as an essential part of huge variety of communication systems including, satellite-communication systems, wireless communication systems and radio transmission. They are indispensable multiple port components that are used for combination and separation of specific signals or frequency bandwidths selectively from a single signal or frequency bandwidth in multiport communication system. The main blocks that form a multiplexer are a set of filters, named as channel filters, and junctions connecting to filters to the common port. In satellite-communication systems, waveguide filter structures are mostly preferred and employed as channel filter in multiplexer configuration due to the fact that they are of low insertion loss, high power handling capability and high quality factor. On the other, bulkiness and large sizes of them are troublesome in satellite-communication applications. Therefore, one of the main goals of this thesis is...
Turkish Journal of Electrical Engineering and Computer Sciences
A novel method is presented for electrically tuning the frequency of a compact radio-frequency id... more A novel method is presented for electrically tuning the frequency of a compact radio-frequency identification (RFID) tag antenna. A tuning circuit, comprising a radio frequency (RF) switch and discrete passive components, was completely integrated into the antenna element, which is thus free of DC wires. The low-profile printed antennas were fabricated together with the layouts of the DC control circuits and other RF/baseband circuit footprints. A surface-mounted varactor was applied as a frequency-tuning element at the proper places of the meandered slots in the compact antenna. Prototype designs showed that the in-band frequency (return loss < 10 dB) was tunable from 2.4 GHz to 2.8 GHz when the bias voltage varied from 4 V to 7 V. The impact of the tuning circuit on the antenna's return loss and radiation pattern were experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex compact structures as well as other types of antennas to give enhanced electrical performance.
Bu arastirma Usak ilindeki ilkogretim okullari yoneticilerinin iletisim yeterliliklerine iliskin ... more Bu arastirma Usak ilindeki ilkogretim okullari yoneticilerinin iletisim yeterliliklerine iliskin ogretmen gorusleri ile ogretmenlerin orgutsel guven duzeyleri arasindaki iliski durumunu belirlemek amaciyla gerceklestirilmistir.Bu amac dogrultusunda yapilan arastirma 2011–2012 egitim ogretim yilinda Usak merkezde yer alan ilkogretim okullarinda gorev yapan 297 ogretmenin katilimiyla gerceklesmistir.Arastirmada veriler kisisel bilgi formu, iletisim yeterlilikleri olcegi ile okullarda orgutsel guven olcegi yardimiyla toplanmistir. Arastirmaya katilanlarin demografik ozelliklerinin belirlenmesinde frekans ve yuzde istatistiklerinden, iletisim yeterliligine iliskin gorusler ve orgutsel guven duzeylerinin belirlenmesinde ortalama ve standart sapma istatistiklerinden faydalanilmistir.Ogretmenlerin demografik ozelliklerine gore yoneticilerin iletisim yeterlik duzeylerine iliskin gorusleri ve orgutsel guven duzeylerinin farklilasma durumunun incelenmesinde Mann Whitney U Ve Kruskal Whallis H...
The Journal of Engineering, 2009
2015 9th European Conference on Antennas and Propagation (EuCAP), 2015
This paper presents millimeter wave phased array antenna for short range communication applicatio... more This paper presents millimeter wave phased array antenna for short range communication applications at 35 GHz. The antenna array is formed by 1 × 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.
2010 10th Mediterranean Microwave Symposium, 2010
A novel method is presented for electrically tuning the frequency of a compact RFID tag antenna. ... more A novel method is presented for electrically tuning the frequency of a compact RFID tag antenna. A tuning circuit, comprising an RF switch and discrete passive components, has been completely integrated into the antenna element, which is thus free of dc wires. The low-profile printed antennas are fabricated together with the layouts of its DC control circuits and other RF/base-band circuit footprints. A surface mounted (SMT) varactor is applied as a frequency-tuning element at proper places of the meandered slots in compact antenna. Prototype designs show the in-band frequency (return loss is <10 dB) is tunable from 2.4 GHz to 2.8 GHz when the bias voltage varies from 4V to 7 V. The impact of the tuning circuit on the antenna's return loss and radiation pattern have been experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex compact structures as well as other types of antennas to give enhanced electrical performance.
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015
16 × 16 phased array antenna composed of microstrip antipodal tapered slot antenna elements is de... more 16 × 16 phased array antenna composed of microstrip antipodal tapered slot antenna elements is designed at Ka-band. The array element is designed by using infinite array simulations to approximate the mutual coupling effects to obtain good input match for various beam steering angles in the final array. A circular rim with ground plane is added to the final array to suppress grating lobes appear when the beam is steered. It is shown by simulations that grating lobe is suppressed to a level less than -20 dB at 35 GHz.
Frequency multiplexer structures are of a crucial role as an essential part of huge variety of co... more Frequency multiplexer structures are of a crucial role as an essential part of huge variety of communication systems including, satellite-communication systems, wireless communication systems and radio transmission. They are indispensable multiple port components that are used for combination and separation of specific signals or frequency bandwidths selectively from a single signal or frequency bandwidth in multiport communication system. The main blocks that form a multiplexer are a set of filters, named as channel filters, and junctions connecting to filters to the common port. In satellite-communication systems, waveguide filter structures are mostly preferred and employed as channel filter in multiplexer configuration due to the fact that they are of low insertion loss, high power handling capability and high quality factor. On the other, bulkiness and large sizes of them are troublesome in satellite-communication applications. Therefore, one of the main goals of this thesis is...
Turkish Journal of Electrical Engineering and Computer Sciences
A novel method is presented for electrically tuning the frequency of a compact radio-frequency id... more A novel method is presented for electrically tuning the frequency of a compact radio-frequency identification (RFID) tag antenna. A tuning circuit, comprising a radio frequency (RF) switch and discrete passive components, was completely integrated into the antenna element, which is thus free of DC wires. The low-profile printed antennas were fabricated together with the layouts of the DC control circuits and other RF/baseband circuit footprints. A surface-mounted varactor was applied as a frequency-tuning element at the proper places of the meandered slots in the compact antenna. Prototype designs showed that the in-band frequency (return loss < 10 dB) was tunable from 2.4 GHz to 2.8 GHz when the bias voltage varied from 4 V to 7 V. The impact of the tuning circuit on the antenna's return loss and radiation pattern were experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex compact structures as well as other types of antennas to give enhanced electrical performance.
Bu arastirma Usak ilindeki ilkogretim okullari yoneticilerinin iletisim yeterliliklerine iliskin ... more Bu arastirma Usak ilindeki ilkogretim okullari yoneticilerinin iletisim yeterliliklerine iliskin ogretmen gorusleri ile ogretmenlerin orgutsel guven duzeyleri arasindaki iliski durumunu belirlemek amaciyla gerceklestirilmistir.Bu amac dogrultusunda yapilan arastirma 2011–2012 egitim ogretim yilinda Usak merkezde yer alan ilkogretim okullarinda gorev yapan 297 ogretmenin katilimiyla gerceklesmistir.Arastirmada veriler kisisel bilgi formu, iletisim yeterlilikleri olcegi ile okullarda orgutsel guven olcegi yardimiyla toplanmistir. Arastirmaya katilanlarin demografik ozelliklerinin belirlenmesinde frekans ve yuzde istatistiklerinden, iletisim yeterliligine iliskin gorusler ve orgutsel guven duzeylerinin belirlenmesinde ortalama ve standart sapma istatistiklerinden faydalanilmistir.Ogretmenlerin demografik ozelliklerine gore yoneticilerin iletisim yeterlik duzeylerine iliskin gorusleri ve orgutsel guven duzeylerinin farklilasma durumunun incelenmesinde Mann Whitney U Ve Kruskal Whallis H...
The Journal of Engineering, 2009