Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Institution Author: search.filters.institutionAuthor.Bozdağ, Göksenin

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Now showing 1 - 8 of 8
  • Conference Object
    Citation - Scopus: 1
    A Compact Dual-Band Gcpw-Fed Antenna for Wlan, Wimax and Bluetooth Applications
    (IEEE, 2017) Bozdağ, Göksenin; Kuştepeli, Alp
    In this study, a compact dual-band grounded coplanar waveguide fed printed planar monopole antenna (GCPW-PPMA) is designed and realized for Bluetooth, WLAN and WiMAX applications. Antenna is designed in two stages and a low-cost FR4 substrate is used. Firstly, a GCPW fed trapezoidal shape printed monopole radiator patch is designed at 5.8 GHz band and its bandwidth is improved by employing an inset. In the second phase, two different slot geometries are employed to excite 2.45 GHz band. Slot loadings, radiating patch and inset feeding are optimized and the dimensions of the resulting antenna are obtained as 25mm x 27.5 mm. Simulated and measured results are in good agreement, and measured operating bands of the proposed antenna are 2.40 GHz-2.52 GHz and 3.76 GHz-5.875 GHz for S-11 < -10 dB. The proposed GCPW-PPMA has dipole like radiation patterns in the operating bands. Its measured realized gains are 1 dB at 2.45 GHz and 2.5 dB at 5.8 GHz. The proposed antenna is suitable for space and weight limited portable devices.
  • Article
    Citation - WoS: 7
    Citation - Scopus: 8
    Compact Wideband Tapered-Fed Printed Bow-Tie Antenna With Rectangular Edge Extension
    (John Wiley and Sons Inc., 2019) Bozdağ, Göksenin; Seçmen, Mustafa
    In this article, a wideband printed bow-tie antenna is designed entire band of GPS (L5), PCS, IMT-2000, Bluetooth, Wi-Fi, WiMAX bands, and the most of frequency range of UWB. Apart from the traditional designs, the proposed antenna includes tapered printed line with a feeding point patch and triangular bows with rectangular edge extensions, which makes the antenna more compact. The antenna realized at the frequency band of 1.49-9.5 GHz (more than 6.3:1 ratio bandwidth) has the dimensions of 122mmx56mm (0.61(0)x0.28(0)). According to measurement results, the realized gain varies between almost 1 and 6.5 dBi with 4.44dBi average, which are in good agreement with simulation results. Radiation patterns at the lower frequencies of operating band show dipole like radiation pattern with higher cross-pol discrimination levels while they degrade at the higher frequencies due to increase in gain.
  • Other
    Citation - WoS: 2
    Citation - Scopus: 1
    Erratum To: Multi-Band Cpw Fed Mimo Antenna for Bluetooth, Wlan, and Wimax Applications
    (John Wiley and Sons Inc., 2017) Deste, İrem; Bozdağ, Göksenin; Kuştepeli, Alp
    In the above-mentioned article, which appeared in Microwave and Optical Technology Letters, Volume 58#9, DOI 30001, the captions for Figure 1 and Figure 4 were published incorrectly. The corrections are shown below: Figure 1 Element antenna (a) Geometry (b) Fabricated (a = 12.5 mm, b = m = v = o = 0.5 mm, c = 4 mm, d = n = 15 mm, e = h = 3 mm, f = 14 mm, g = 16 mm, i = 7 mm, k = 1.5 mm, l = 12 mm, p = 1.25 mm, r = 1.64 mm, s = 1.7 mm, t = 1.94 mm, u = 11.1 mm, w = 0.3 mm). [Color figure can be viewed at wileyonlinelibrary.com] Figure 4 Fabricated MIMO antenna (d1 = d3 = 7 mm, d2 = 10 mm, d4 = 12 mm). [Color figure can be viewed at wileyonlinelibrary.com] In addition, Figure 6 was published with an error. The corrected figure is shown below: The publisher regrets any confusion caused by these errors. (Figure presented.).
  • Other
    Citation - WoS: 1
  • Article
    Citation - WoS: 32
    Citation - Scopus: 41
    Subsectional Tapered Fed Printed Lpda Antenna With a Feeding Point Patch
    (Institute of Electrical and Electronics Engineers Inc., 2016) Bozdağ, Göksenin; Kuştepeli, Alp
    In this letter, a log-periodic dipole array (LPDA) antenna operating between 1.1 and 13.8 GHz with VSWR < 2and an average peak realized gain of 5.2 dB is presented. It is suitable for GPS (L1-L5), PCS, IMT-2000, Bluetooth, WLAN, WiMAX, UWB, and X-band applications. The antenna is designed by introducing a subsectional tapered feedline instead of standard microstrip feeding, which leads to a remarkable lower-frequency performance. The upper-frequency performance of the antenna is improved by adding a feeding point patch. The group delay is also examined for the final design, and maximum 1.5 ns deviation is observed in UWB. By using ordinary and simple dipoles with this modified feedline approach, a superior antenna performance is obtained over a very wide frequency band, and it is validated by the comparison of three fabricated antennas. Additionally, the antenna size is also reduced without using complicated and/or top-loaded dipole structures.
  • Article
    Citation - WoS: 5
    Citation - Scopus: 9
    Wideband Planar Monopole Antennas for Gps/Wlan and X-Band Applications
    (John Wiley and Sons Inc., 2016) Bozdağ, Göksenin; Kuştepeli, Alp
    In this article, two printed planar monopole antennas (PPMA) are presented. In the design of the first PPMA, the structure is divided into sections and they are optimized in the sense of bottom to up strategy. Tapered transitions and inset feed are employed to increase the bandwidth. The antenna operates between 2.37 GHz and 12 GHz with VSWR<2 and an average peak realized gain of 4.95 dB. Therefore, it is suitable for WLAN, WiMAX, UWB, and X-Band applications. The second PPMA is designed by implementing slots on the previous one to include GPS. The resulting antenna operates in the 1.38-1.60 GHz and 2.33-13.74 GHz bands with VSWR<2. As a result, it also includes GPS in addition to the previous bands. The peak realized gain in GPS is 0.47 dB at 1.575 GHz and the average peak realized gain is 4.41 dB for the 2.33-13.74 GHz band. The group delay performances of the proposed PPMAs are also examined and the maximum group delay deviations of the first and the second PPMAs are observed as 1 ns and 1.33 ns, respectively.
  • Article
    Citation - WoS: 13
    Citation - Scopus: 18
    Multi-Band Cpw Fed Mimo Antenna for Bluetooth, Wlan, and Wimax Applications
    (John Wiley and Sons Inc., 2016) Desde, İrem; Bozdağ, Göksenin; Kuştepeli, Alp
    In this letter, multi-band coplanar waveguide (CPW) fed multiple-input-multiple-output (MIMO) antenna is presented for Bluetooth, WLAN and WiMAX applications. The elements of MIMO antenna are identical CPW-fed printed monopole antennas whose bandwidth performances are improved by employing inverse U and meander line slots. In the design of the antennas, a low-cost FR4 substrate is used and the size of the element antennas are optimized as 35 mm x 30 mm. According to the measurements, S11 is below −10 dB in 2.38 GHz – 2.52 GHz and 3.19 GHz – 6.44 GHz bands with 0.2 dB and 2.9 dB average peak realized gains, respectively. The element antennas are placed orthogonally and fed independently to obtain MIMO structure whose size is optimized as 42 mm x 62 mm. The performance of MIMO antenna is also examined in terms of diversity parameters such as envelope correlation coefficient and apparent diversity gain, which are lower than 0.02 and higher than 9.9 in the operating bands, respectively.
  • Article
    Citation - Scopus: 8
    Wideband Printed Planar Monopole Antenna for Pcs, Uwb and X-Band Applications
    (EMW Publishing, 2015) Bozdağ, Göksenin; Kuştepeli, Alp
    In this paper, a printed planar monopole antenna (PPMA) is presented for PCS, UWB and X-band. The antenna is designed in two stages. In the design of the preliminary PPMA used to obtain the proposed PPMA, the structure is divided into sections, and they are optimized in the sense of bottom to up strategy. The bandwidth is enhanced by employing tapered transitions and inset feed. The resulting antenna operates between 2.37 GHz and 12 GHz with VSWR < 2 and an average peak realized gain of 4.95 dB. Therefore, the preliminary antenna can be considered to be suitable for Bluetooth, WLAN, WiMAX, UWB and X-band. The proposed PPMA is designed by implementing slots on the preliminary PPMA to include PCS, and to suppress Bluetooth and commonly used WLAN and WiMAX bands, the ones allocated out of UWB. The proposed antenna operates in the 1.67 GHz– 1.91 GHz and 3GHz–15 GHz bands with VSWR < 2. The peak realized gain (Gpr) in PCS is 1.32 dB at 1.8GHz, and the average Gpr is 5 dB for the 3 GHz–15 GHz band. The group delay performances are also examined, and the maximum group delay deviations of preliminary and proposed PPMAs are observed as 1 ns and 1.25 ns, respectively.