Aydınlık Bechteler, Ayşe Sevinç
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Bechteler, Ayse Sevinc Aydinlik
Aydınlık Bechteler, A. S.
Aydınlık Bechteler, A. Sevinç
Aydınlık Bechteler, Sevinç
Aydınlık Bechteler, A. S.
Aydınlık Bechteler, A. Sevinç
Aydınlık Bechteler, Sevinç
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03.05. Department of Electrical and Electronics Engineering
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Scholarly Output
5
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3
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24290/1646
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1
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8
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6
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1.60
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1.20
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4
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1
| Journal | Count |
|---|---|
| Microwave and Optical Technology Letters | 2 |
| IEEE Microwave Magazine | 1 |
| Piers 2009 Moscow Vols I And Ii, Proceedings | 1 |
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Now showing 1 - 5 of 5
Article Citation - WoS: 2Citation - Scopus: 2The Groove-Guide Oscillator(Institute of Electrical and Electronics Engineers Inc., 2011) Bechteler, Thomas F.; Aydınlık Bechteler, Ayşe SevinçThe groove guide, a low-loss waveguide consists of two separate parallel plates whose separation distance can be adjusted, thereby affecting the frequency of operation of the guide itself. The standing waves in a groove guide along the direction of propagation are commonly obtained by either total reflection at both ends or by forming a closed loop. A negative resistance has to be implemented to induce oscillations of the groove guide resonator. It is desirable to induce oscillations directly inside the groove region therefore the negative resistance must be placed inside the groove. A Gunn element was selected to provide this negative resistance. A standard heterodyne system may be realized in order to use the groove-guide oscillator for distance or permittivity measurements. The groove-guide oscillator works as an active sensor in the X-band. The accuracy with which the resonant frequency is determined depends on the bias stability of the Gunn element, the phase noise of the local oscillator, and the error of the frequency counter.Master Thesis Setup and Calibration of a Heterodyne Receiver for Microwave Sensors(Izmir Institute of Technology, 2008) Bildik, Saygın; Aydınlık Bechteler, Ayşe SevinçThe demand for sensors for the measurement of various quantities has increased with the automatisation of industrial processes. In many cases microwave techniques provide competitive solutions. A large number of important applications are found such as dielectric constant measurement, moisture measurement, length measurement, leaking gas detection, radar applications, etc.Heterodyne receiver system is set up and calibrated to measure the resonant frequencies of resonator type sensors precisely and inexpensively. Output frequencies of the resonator type sensors are varied by the change in physical dimensions of the resonator or physical properties of a material placed in a resonator to be processed. Instead of the classical audio amplifier and a loudspeaker which are the elements of a classical heterodyne receiver, a frequency counter evaluates the signal. Thus, the heterodyne receiver used in frequency measurement system consists of a mixer, a voltage controlled oscillator, a microstrip line low-pass filter and a frequency counter. The output signal of the resonator is converted down to an intermediate frequency which is in the counting range of frequency counter via the mixer with VCO. Then, the measured data is sent to a computer and it is converted to the wanted data related to which measurement (distance, dielectric constant, etc.) is done and which resonator is used.In this study, distance measurement is performed by using a circular groove guide oscillator as a microwave sensor connected to the heterodyne receiver system. The most important feature of the groove guide oscillator is its resonator consists of physically two open parallel plates. Therefore, the resonant frequency of the oscillator can be changed depending on the distance between the two parallel plates. This makes the groove guide oscillator feasible for some applications like the distance measurement, using the resonant frequency measurement setup.Conference Object Citation - WoS: 1Distance Measurement by Means of a Groove Guide Oscillator(Electromagnetics Academy, 2009) Bechteler, Thomas F.; Aydınlık Bechteler, Ayşe SevinçIn this work, a system for measuring the distance between two metallic plates is presented. A groove guide resonator operating in the X-band with an incorporated Gunn element serves as the distance sensor. According to the distance between the two metallic plates, the resonant frequencies of the groove guide oscillator change. In a first step, the fundamental resonant frequency of the groove guide oscillator at various distances is computed by means of the FDTD (Finite Difference Time Domain) method. In a second step, the resonant frequencies of the realized groove guide oscillator were measured. Although the signal's wavelength is about 30 mm, the resolution of the measurement is in the sub-millimeter level, i.e., about 25 mu m. Furthermore, in case of distance variations, even within a short time, the system is able to track distance variations nearly instantaneously. The resonant frequency information is processed using a heterodyne system.Article Citation - WoS: 3Citation - Scopus: 3Switchless Bidirectional Amplifier for Wireless Communication Systems(John Wiley and Sons Inc., 2007) Aydınlık Bechteler, Ayşe Sevinç; Bechteler, Thomas F.A bidirectional amplifier working at 2.4 GHz is presented in this article. The presented amplifier is able to amplify two signals simultaneously. This, since commonly used radio frequency switches are replaced by circulators. The amplifier is designed on a single small-sized printed circuit board. First, the new amplifier circuit is proposed and characterized. Then, its advantages and design problems are analyzed. Finally, design instructions are setup in order to obtain a good performance of the switchless amplifier within the frequency band of interest.Article Citation - WoS: 2Citation - Scopus: 1Design of Coupling Structures for Groove Guide Resonators(John Wiley and Sons Inc., 2008) Bechteler, Thomas F.; Kuştepeli, Alp; Aydınlık Bechteler, Ayşe SevinçThree different coupling structures for a groove guide resonator operating at 10 GHz are investigated. First, propagatable modes are determined analytically. Then, the efficiency of the coupling structures is investigated by means of the method of moments and measurements. Finally, a groove guide resonator is designed and the resonance spectrum for each coupling structure is computed numerically, applying the finite-difference time-domain method. Numerical results are compared with experimental measurements. There is good agreement between the measured and simulated data.