The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
M. Nakano - One of the best experts on this subject based on the ideXlab platform.
-
Direction-of-arrival estimation system for multipath propagation in code-division multiple-access systems with synthesized virtual Planar Array using pilot signals
IEEE Transactions on Vehicular Technology, 2008Co-Authors: Akimichi Hirota, Hiroyuki Arai, M. NakanoAbstract:Here, we propose a method for estimating the direction of arrival (DOA) using pilot signals in code-division multiple-access (CDMA) systems. We also report the evaluation of the performance of the proposed method by conducting simulations and experiments in an anechoic chamber and an outdoor environment. This method estimates the DOA of the arrival waves by synthesizing the data received by a virtual Planar Array using pilot signals. First, we describe a method for synthesizing the data received by the virtual Planar Array using pilot signals. Next, we present simulation results that confirmed that the accuracy of the estimation based on the virtual Planar Array was the same as that based on a real Planar Array. Last, we describe the effectiveness of the proposed system that is demonstrated through experiments in both the anechoic chamber and in an outdoor environment. © 2008 IEEE.
-
Characteristics of Virtual Planar Array Antenna for Direction-of-arrival Estimation
2006 European Conference on Wireless Technology, 2006Co-Authors: Akimichi Hirota, Hiroyuki Arai, M. NakanoAbstract:In this paper, we report the evaluation of the performance of the methods for estimating the direction of arrival (DoA) with a virtual Planar Array antenna by conducting simulations and experiments in an anechoic chamber. These methods estimate the DOA of the arrival waves by synthesizing data received by a virtual Planar Array. First, we describe methods for synthesizing the data received by the virtual Planar Array using a T-shaped Array antenna. Next, we present the simulation results that confirmed that the accuracy of these methods based on the virtual Planar Array. Finally, we demonstrate the effectiveness of the proposed systems through experiments in the anechoic chamber
Akimichi Hirota - One of the best experts on this subject based on the ideXlab platform.
-
Direction-of-arrival estimation system for multipath propagation in code-division multiple-access systems with synthesized virtual Planar Array using pilot signals
IEEE Transactions on Vehicular Technology, 2008Co-Authors: Akimichi Hirota, Hiroyuki Arai, M. NakanoAbstract:Here, we propose a method for estimating the direction of arrival (DOA) using pilot signals in code-division multiple-access (CDMA) systems. We also report the evaluation of the performance of the proposed method by conducting simulations and experiments in an anechoic chamber and an outdoor environment. This method estimates the DOA of the arrival waves by synthesizing the data received by a virtual Planar Array using pilot signals. First, we describe a method for synthesizing the data received by the virtual Planar Array using pilot signals. Next, we present simulation results that confirmed that the accuracy of the estimation based on the virtual Planar Array was the same as that based on a real Planar Array. Last, we describe the effectiveness of the proposed system that is demonstrated through experiments in both the anechoic chamber and in an outdoor environment. © 2008 IEEE.
-
Characteristics of Virtual Planar Array Antenna for Direction-of-arrival Estimation
2006 European Conference on Wireless Technology, 2006Co-Authors: Akimichi Hirota, Hiroyuki Arai, M. NakanoAbstract:In this paper, we report the evaluation of the performance of the methods for estimating the direction of arrival (DoA) with a virtual Planar Array antenna by conducting simulations and experiments in an anechoic chamber. These methods estimate the DOA of the arrival waves by synthesizing data received by a virtual Planar Array. First, we describe methods for synthesizing the data received by the virtual Planar Array using a T-shaped Array antenna. Next, we present the simulation results that confirmed that the accuracy of these methods based on the virtual Planar Array. Finally, we demonstrate the effectiveness of the proposed systems through experiments in the anechoic chamber
Hiroyuki Arai - One of the best experts on this subject based on the ideXlab platform.
-
Direction-of-arrival estimation system for multipath propagation in code-division multiple-access systems with synthesized virtual Planar Array using pilot signals
IEEE Transactions on Vehicular Technology, 2008Co-Authors: Akimichi Hirota, Hiroyuki Arai, M. NakanoAbstract:Here, we propose a method for estimating the direction of arrival (DOA) using pilot signals in code-division multiple-access (CDMA) systems. We also report the evaluation of the performance of the proposed method by conducting simulations and experiments in an anechoic chamber and an outdoor environment. This method estimates the DOA of the arrival waves by synthesizing the data received by a virtual Planar Array using pilot signals. First, we describe a method for synthesizing the data received by the virtual Planar Array using pilot signals. Next, we present simulation results that confirmed that the accuracy of the estimation based on the virtual Planar Array was the same as that based on a real Planar Array. Last, we describe the effectiveness of the proposed system that is demonstrated through experiments in both the anechoic chamber and in an outdoor environment. © 2008 IEEE.
-
Characteristics of Virtual Planar Array Antenna for Direction-of-arrival Estimation
2006 European Conference on Wireless Technology, 2006Co-Authors: Akimichi Hirota, Hiroyuki Arai, M. NakanoAbstract:In this paper, we report the evaluation of the performance of the methods for estimating the direction of arrival (DoA) with a virtual Planar Array antenna by conducting simulations and experiments in an anechoic chamber. These methods estimate the DOA of the arrival waves by synthesizing data received by a virtual Planar Array. First, we describe methods for synthesizing the data received by the virtual Planar Array using a T-shaped Array antenna. Next, we present the simulation results that confirmed that the accuracy of these methods based on the virtual Planar Array. Finally, we demonstrate the effectiveness of the proposed systems through experiments in the anechoic chamber
Achmad Munir - One of the best experts on this subject based on the ideXlab platform.
-
Incorporation of Spiral Shaped Defected Ground Structure for Improving Radiation Characteristic of Planar Array-Antenna
2019 IEEE Conference on Antenna Measurements & Applications (CAMA), 2019Co-Authors: Mochamad Yunus, Zero Luthfi Patriana, Evyta Wismiana, Teguh Firmasyah, Budi Syihabuddin, Achmad MunirAbstract:This paper deals with the incorporation of spiral shaped defected ground structure (DGS) for improving radiation characteristic for Planar Array-antenna. The proposed Planar Array-antenna which is intended to operate at the frequency of 2.4GHz is designed on an FR4 epoxy dielectric substrate with the thickness of 1.6 mm and analyzed by use of a simulation software. It consists of 4× 4 elements where the microstrip line inset feeding method is employed to excite each antenna element. The characterization results show that the use of spiral shaped DGS yields the measured radiation characteristic to achieve the gain achievement of 10.47 dBi at the resonant frequency and the -10 ddB bandwidth response of 140 MHz. These results are comparable to the simulated ones which are showing the potentiality of spiral shaped DGS incorporation for the radiation characteristics improvement.
-
Planar Array-Antenna with Improved Radiation Characteristic Using Spiral Shaped DGS
2018 International Conference on Applied Electromagnetics Signal Processing and Communication (AESPC), 2018Co-Authors: Mochamad Yunus, Zero Luthfi Patriana, Evyta Wismiana, Teguh Firmasyah, Achmad MunirAbstract:In this paper, the improvement of radiation characteristic for Planar Array-antenna by incorporating spiral shaped defected-ground-structure (DGS) is presented. The proposed Planar Array-antenna which is designed to work at the frequency of 2.4GHz consists of 4×4 elements in which the inset feed method is employed to excite each antenna element. The Planar Array-antenna is implemented using a 1.6 mm thick FR4 epoxy dielectric substrate and analyzed through a simulation. The simulated result of radiation characteristics for the Planar Array-antenna is then validated by experimental characterization. It shows that the spiral shaped DGS incorporation yields measured radiation characteristics of the Planar Array-antenna to have the bandwidth response of 140 MHz and the gain achievement of 10.47 dB at its resonant frequency. This is comparable to the simulated result which is showing the potentiality of spiral shaped DGS usage in the improvement of radiation characteristics.
-
Bowtie-shaped DGS for reducing coupling between elements of Planar Array antenna
2017 International Symposium on Electronics and Smart Devices (ISESD), 2017Co-Authors: Mochamad Yunus, Evyta Wismiana, Trio Johan Sinaga, Iskandar Fitri, Achmad MunirAbstract:In this paper, the utilization of bowtie-shaped defected ground structure (DGS) incorporated into the groundplane of Planar Array antenna is proposed to reduce the coupling between two elements of Planar Array antenna. A double side of FR4 epoxy dielectric substrate with the dimension of 105mm × 130mm and the thickness of 1.6mm is used to deploy the Planar Array antenna. Two elements of Planar Array antenna are placed on the top side of dielectric substrate, while the bowtie-shaped DGS is put in the groundplane at the bottom side. To reduce the amount of coupling between two elements of Planar Array antenna, the DGS which takes bowtie-shaped is introduced. From the results, both simulation and measurement verified that the bowtie-shaped DGS reduced the coupling at the resonance frequency of 1.955 GHz. The simulated and measured couplings could be reduced up to 0.67 dB and 2.4 dB, respectively.
-
Planar Array approach as alternative method to characterize radiation pattern of 2 × 2 spiral resonator (SR) structure
2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017Co-Authors: Mochamad Yunus, Fitri Yuli Zulkifli, Eko Tjipto Rahardjo, Achmad MunirAbstract:This paper presents the Planar Array approach as an alternative method to characterize radiation pattern of spiral resonator (SR) structure. The method involves the development of linear Array approach of SR structure with a single patch discussed herein. The Planar Array is constructed of 2 × 2 SR structure in which each single patch of SR structure is assumed as a similar non-isotropic point source. To verify the proposed Planar Array approach, the 2 × 2 SR structure implemented as an antenna radiator is characterized using 3D simulation software and experimentally measured to obtain its radiation pattern. The maximum electric field intensities of radiation pattern at the boresight direction obtained from the proposed approach, simulation, and measurement are 24.54 V/m, 24.56V/m, and 24.49 V/m, respectively. It shows that the electric field intensities at the boresight direction have good agreement each other.
Manuchehr Soleimani - One of the best experts on this subject based on the ideXlab platform.
-
Planar Array magnetic induction tomography further improvement
Sensor Review, 2019Co-Authors: Fang Li, Manuchehr Soleimani, Juan F. P. J. AbascalAbstract:Purpose Magnetic induction tomography (MIT) is a tomographic imaging technique with a wide range of potential industrial applications. Planar Array MIT is a convenient setup but unable to access freely from the entire periphery as it only collects measurements from one surface, so it remains challenging given the limited data. This study aims to assess the use of sparse regularization methods for accurate position and depth detection in Planar Array MIT. Design/methodology/approach The most difficult challenges in MIT are to solve the inverse and forward problems. The inversion of Planar MIT is severely ill-posed due to limited access data. Thus, this paper posed a total variation (TV) problem and solved it efficiently with the Split Bregman formulation to overcome this difficulty. Both isotropic and anisotropic TV formulations are compared to Tikhonov regularization with experimental MIT data. Findings The results show that Tikhonov method failed or underestimated the object position and depth. Both isotropic and anisotropic TV led to accurate recovery of depth and position. Originality/value There are numerous potential applications for Planar Array MIT where access to the materials under testing is restrict. Sparse regularization methods are a promising approach to improving depth detection for limited MIT data.
-
Planar Array Capacitive Imaging Sensor Design Optimization
IEEE Sensors Journal, 2017Co-Authors: Carl Tholin-chittenden, Manuchehr SoleimaniAbstract:Electrical capacitance tomography (ECT) is used in many industries as a non-invasive detection and measurement method, which works by finding permittivity changes in a viewing region. This usually consists of sensor electrodes surrounding a region of interest; however, this is not always possible as sometimes the viewing region is only accessible from a single side. In this case, a Planar Array ECT system can be used where the electrodes are all laid out on a co-Planar surface. Initial simulation results indicated some features of sensor design which might aid image reconstructions. Five new electrode configurations were designed which incorporated these features in different ways. The designs were tested on their ability to reproduce a wooden block suspended in air and a water bottle buried in sand. Their performance was judged based on distance/depth detection of the block/water bottle, and the shape of the reconstruction. Singular value decomposition analysis was also performed on each sensor design to show their theoretical ability to reproduce the permittivity of the viewing region. Previously, similar work managed to reliably reconstruct objects at distances of 60 mm from the sensor. But in this paper, with a smaller sensor head, up to 90 mm was achieved with good accuracy. Combining the sensor designs together into a single sensor created the combined sensor, which was able to reconstruct objects with a much greater reliability, and was less susceptible to error or noise. With the right setup, the combined sensor was able to achieve up to 120 mm of depth detection. Also the combined sensor was able to detect a buried water bottle in sand up to 50 mm. Further simulation results on the combined sensor indicated that using up to 100 unique sensor configurations in the combined sensor was beneficial, but after 100 the amount of additional information gained was not significant. The results showed that the sensor head design can be optimized in order to produce improved reconstruction for Planar Array ECT. This improvement means that Planar Array ECT could potentially become a viable option for applications, such as landmine detection, particularly finding non-metallic objects, which cannot be picked up with conventional landmine detection techniques, such as metal detectors.
-
Planar Array 3D electrical capacitive tomography
Insight, 2013Co-Authors: Zhuoyi Ye, Robert Banasiak, Manuchehr SoleimaniAbstract:Electrical capacitance tomography (ECT) is a promising non-invasive imaging technique that is capable of mapping the dielectric permittivity of an object. ECT has great potential to be used as a new non-destructive evaluation (NDE) method. In the majority of NDE applications for ECT there is only limited access to the targeted objects, making conventional circular Array ECT impractical. In this paper, a Planar Array ECT system is developed and proposed for 3D subsurface imaging as a form of limited access tomography. The sensor development, practical implications, capabilities and limitations of the proposed Planar Array ECT system are discussed. The experimental results are used to evaluate the system performance. A depth of up to 53% of the length of the sensor Array can be achieved using experimental data using an Array of 4 × 3 electrodes.