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Publication Metadata only Characterizing Attenuation of Bumper Modifications: A Comparative Study in the E-Band(IEEE, 2024) Neubauer, Michael; Hirschmugl, Michael; Petanjek, David; Kiebach, Helge; Karamzadeh, Saeid; Kolosovs, D; Anstalt fur Verbrennungskraftmaschinen List; Bahcesehir UniversityHaving knowledge about the attenuation of the materials surrounding a radar sensor is of great importance in the automotive sector. Only then can the manufacturer guarantee the desired functionality of the sensor. Due to the fact that a lot of automotive manufacturers also started integrating radar sensors behind rear bumpers for improved visibility to the back of a car, it is vital to know how those bumpers and possible repair scenarios done to them can affect the radar sensor. This paper proposes a way to measure the attenuation in the E-band of not only square slab samples representing various types of paint and repair scenarios on automotive bumpers, but also actual rear bumpers with different types of repair scenarios. The results are then presented and compared relative to each other.Publication Metadata only Assessing Automotive Bumper Materials: A Comparative Study on Attenuation at 77GHz(IEEE, 2024) Neubauer, Michael; Petanjek, David; Hirschmugl, Michael; Kiebach, Helge; Karamzadeh, Saeid; Bahcesehir UniversityHaving information about the materials surrounding the radar sensors is essential in the automotive sector, in order to guarantee good functionality of the sensor. Since automotive manufacturers also start integrating radar sensors behind bumpers, it is essential to know the characteristics of the materials used in bumpers and how a repair of a bumper would alter those characteristics. This paper shows, how the damping characteristics of different samples were measured at 77GHz using a scalar measurement setup and compares the attenuation for different types of paints and modifications.Publication Metadata only Design and analysis of a label-free water-soluble glucose sensor based on suspended hybrid plasmonic micro-ring resonator(IEEE, 2022) Moeinimaleki, Kaveh; Moeinimaleki, Babak; Zarean, Rana; Abedashtiani, Alireza; Karamzadeh, Saeid; Akdeniz University; Bahcesehir UniversityIn this paper, the design and analysis of a label-free water-soluble glucose sensor based on a suspended hybrid plasmonic micro-ring resonator with an external radius of 940 nm in the third telecommunication window to sense the concentration of water-soluble glucose is presented. The simulation results obtained using three-dimensional FDTD show that the sensitivity and the figure of merit values obtained for glucose measurements with concentrations of 0 to 50% in water solution are 218.5 (nm/RIU) and 16.11 (1/RIU), respectively. Comparing the results of the proposed sensor with the previous work, which has four times more footprint, shows that the structure's sensitivity has increased by 17 percent.Publication Metadata only Neural Network-Based Human Detection Using Raw UWB Radar Data(IEEE, 2024) Dogan, Emine Berjin; Yousefi, Mohammad; Soyak, Ece Gelal; Karamzadeh, Saeid; Kolosovs, D; Bahcesehir University; Bahcesehir University; Bahcesehir University; Bahcesehir UniversityUltra-Wideband (UWB) radar technology is a widely used technology for human detection and tracking through walls, because of its effectiveness in low-visibility situations. This study demonstrates a neural network-based identification of human presence using raw data obtained directly from the UWB radar. First, measurements have been collected with different human subjects at different positions relative to the UWB radar. A convolutional neural network (CNN) model has been trained on this dataset, to detect the presence of a human. Next, the algorithm effectiveness is deeply investigated using the Gradient-weighted Class Activation Mapping (Grad-CAM) method, and the observations on detected presence are discussed.Publication Metadata only Signal Processing Techniques for Human Vital Signs Sensing by Short Range Radar(IEEE, 2020) Eren, Cansu; Karamzadeh, Saeid; Kartal, Mesut; Istanbul Technical University; Bahcesehir University; Istanbul Technical UniversityAmbient Assistant Living(AAL) applications gain importance considering the aging population in the world. The aim of this study is the analysis of signal localization techniques that extract frequency rates of human breathing in AAL applications. Ultra-wideband radar system has been used to detect respiratory rate due to its high resolution and non-ionizing energy. Experimental scenarios are performed in three cases, and the human body is expected as speaking and hand-waving during scenes. In this way, the realistic situations are have been mimicked. The spectrum analysis of the measured signals is performed by Fast Fourier Transform (FFT) and Hilbert Huang Transform (HHT). The comparison of these techniques is given. Considering non-linearity and non-stationarity of HHT, it is more effective and provides regional analysis.Publication Metadata only Evaluating Substrate Influence on Rectangular and Circular Microstrip Patch Antennas for 5G(IEEE, 2024) Goksel, Fatih; Karamzadeh, Saeid; Kolosovs, D; Bahcesehir University; Bahcesehir UniversityMicrostrip Patch Antennas (MSPAs) are favored for their low production cost, compact size, lightweight nature, and adaptability to planar and non-planar surfaces. They are particularly suitable for wideband and multi-frequency operations, making them ideal for sub-6 GHz applications in 5G devices. This study aims to design and compare rectangular and circular MSPAs using six different substrates: FR4 Glass Epoxy (dielectric constant 4.3), ROGERS DT5880 (2.2), ROGERS 4003C (3.3), Teflon (2.1), Arlon AD300A (3), and Alumina (9.9). Using CST Microwave Studio, we first design rectangular MSPAs and then circular MSPAs, maintaining a 1.6 mm substrate height and using Copper (Anneal) for both the patch and ground materials. The target frequency is 5.8 GHz, relevant for 5G applications. By comparing the antenna parameters across different substrates, we aim to identify the optimal substrate and antenna design for future technology needs.Publication Metadata only Improving the Robustness of CNN-Based Human Detection in Multiple Raw UWB Radar Datasets(IEEE, 2024) Yousefi, Mohammad; Dogan, Emine Berjin; Soyak, Ece Gelal; Karamzadeh, Saeid; Bahcesehir University; Bahcesehir University; Bahcesehir University; Bahcesehir UniversityUltra-wideband (UWB) radar technology has gained significant attention for human detection, vital sign monitoring, and activity recognition applications. In this study, a robust deep-learning model capable of detecting human presence in different environments is developed. The model uses only the raw data obtained directly from the radar without preprocessing. The model is trained and tested on different datasets collected via the UWB radar. Transfer learning has been applied to fine-tune the model on datasets to improve the performance and generalization of the model. This study demonstrates the effectiveness of transfer learning in adapting UWB radar-based human detection models to different environments.Publication Metadata only Comparison of Six Different Dielectric Substrates in Microstrip Patch Antenna Design(IEEE, 2024) Goksel, Fatih; Karamzadeh, Saeid; Bahcesehir University; Bahcesehir UniversityMicrostrip patch antenna (MSPA) is the most popular antenna type due to the small size, easy to fabricate, simple and inexpensive construction, lightweight and low volume, conformity with planar and non-planar surfaces, dual and triple frequency operation in recent years. Especially, due to the becoming the size of the devices becoming smaller, desire to design MSPA has gained more importance than before. In this study, as a result of comparison between six different types of antennas, showed us which of the substrate or substrates give us the best performance of the newly designed patch antenna could be chosen. Based on this, in this study, designed rectangular MSPA simulated with six different substrates which are FR4 Glass Epoxy with 4.3, ROGERS DT5880 with 2.2, ROGERS 4003C with 3.3, Teflon with 2.1, Arlon AD300A with 3 and last Alumina with 9.9 dielectric constant. The study includes a copper patch antenna and copper ground working at 5.8 GHz. The six substrates are kept constant at 1.6 mm height. Good results gained at the desired frequency of 5.8 GHz antenna which is at the resonant frequency between 5.7-5.9 GHz. The main aim of this study is to support their research and create an idea about the six different substrates which can be prepared by researchers while choosing the substrate of the MSPAs.Publication Metadata only Detection of Human Respiratory and Range by IRUWB Radar(IEEE, 2023) Shakfa, Ali; Esmaeilishahir, Mahdi; Karamzadeh, Saeid; Bahcesehir UniversityThe technology of Impulse Radio Ultra-Wide-Band (IR-UWB) radar is very promising for non-contact sensing applications, such as detecting human vital signs like heart rate (HR) and respiration rate (RR), as well as determining the location of a person. This research paper introduces a technique for detecting the respiration rate and location of a stationary human. The method involves using preprocessing techniques to improve clutter reduction and estimating the frequency domain of the signals. Low pass and bandpass filters as preprocessing methods are presented. The Fast Fourier Transform (FFT) processing method is used to determine the human RR in the frequency domain. The proposed approach is evaluated using a P440 (IR-UWB) radar and shows promising results. The experiments demonstrate that the proposed method is effective in accurately detecting the vital signs of a stationary single or multiple persons.Publication Metadata only A Wearable Circularly Polarized Antenna for 5G Applications(IEEE, 2022) Ibrahim, Assim; Tetik, Evrim; Karamzadeh, Saeid; Bahcesehir University; Istanbul Arel University5G technology for health care is a considerable demand nowadays due to the revolution in IoT devices. A dual-band antenna on a Rogers RT/duroid 5880 substrate with a dielectric constant of 2.2 and thickness of 0.508 mm, is presented for 3.4 GHz and 5.85GHz frequency bands. The top layer of the proposed antenna consists of a square part that includes an inductive meander line. It is connected to an I-shape, which is merged with reversed L-shaped, the higher resonant frequency excited at 3.4 GHz. In the bottom layer, after the reflector is made, the inductive meander line is created and connected to a reversed U-shape. The proposed antenna of size 19 x 12 mm(2) reveals to perform well for frequencies between 3.37 and 3.47 GHz. It has an axial ratio less than 3dBi and a peak gain of 1.7 dBi that increases after adding a multi-layer of a human hand up to 8 dBi.