ACES Publication Search
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| Title: | ACES Journal August 2019 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2170 KB |
| Title: | ACES Journal August 2019 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1319 KB |
| Title: | ACES Journal August 2019 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 20336 KB |
| Title: | EMC Simulation Based on FDTD Analysis Considering Uncertain Inputs with Arbitrary Probability Density |
| Abstract: | Stochastic Galerkin Method, a prevailing uncertainty analysis method, has been successfully used in today’s EMC simulation, in order to consider nonideality and unpredictability in actual circumstance. In this case, the inputs of the simulation are no longer certain values, but random variables with corresponding probability density distribution. This paper focuses on the arbitrary probability density cases at inputs. Two constructing orthogonal basis methods, the Wiener Haar expansion and the Stieltjes procedure, are generalized into the Stochastic Galerkin Method which is combined with the Finite Difference Time Domain analysis. With the help of the Feature Selective Validation, the quantitative precision comparison of the proposed methods in different cases (the probability density function is continuous or discontinuous) can be presented in detail. |
| Author(s): | J. Bai, G. Zhang, L. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1358 KB |
| Title: | An Effective Sparse Approximate Inverse Preconditioner for the MLFMA Solution of the Volume-Surface Integral Equation |
| Abstract: | In the framework of the multilevel fast multipole algorithm (MLFMA), effective construction of the sparse approximate inverse preconditioner (SAIP) for the volume-surface integral equation (VSIE) is discussed. A high quality SAIP for the entire VSIE matrix is constructed by using the sub-matrix of the nearfield interactions between the surface basis and testing functions arising from the surface integral equation alone. In addition, a simple sparse pattern selection scheme based on the geometrical information of nearby basis functions and octree regrouping strategy is proposed to enhance the efficiency of the SAIP. In contrast to the existing sparse pattern selection schemes, the proposed scheme utilizes the near-field matrix in the MLFMA more effectively with only one tuning parameter. Numerical results indicate that with the proposed scheme, both the memory usage and setup time for constructing an effective SAIP are significantly reduced without compromising the efficiency and robustness. |
| Author(s): | J. Liu, Z. Li, M. He, J. Su |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1681 KB |
| Title: | Uncertainty Analysis of the EMC Simulation Based on the Non-Intrusive Galerkin Method |
| Abstract: | Recently, as a high-efficient uncertainty analysis method, the Stochastic Galerkin Method has been widely applied in EMC simulations. In this method, the original solver must be changed during uncertainty analysis. Thus, the realization of the Stochastic Galerkin Method may become impossible in some cases. In this paper, a novel method named Non-Intrusive Galerkin method is proposed in order to sove this problem. The performance of the proposed method can be clearly shown by calculating a published example. |
| Author(s): | J. Bai, G. Zhang, L. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1424 KB |
| Title: | A New Approach for Improving the Load Current Characteristic of Cascaded Magnetic Flux Compression Generator |
| Abstract: | Helical magnetic flux compression generators (HFCGs) are widely used to generate extremely highpower pulses. Two most important output characteristics of HFCGs in their use as pulsed power generators are maximum value of load current and the rise time of that current. In this paper, an approach is proposed to improve the output characteristic of a Cascaded-HFCG. The approach is based on time-varying primary winding of dynamic transformer and addition of a gradually incremental resistance in series with the first stage winding. It is demonstrated analytically using simulation results that the output current and its rise-time improve by minimizing energy returned from secondary winding to primary winding of dynamic transformer. The results are compared to conventional Cascaded-HFCG that has a non-destructive winding in its structure. A finite element model is considered to calculate the selfinductances, mutual inductance and resistances of the generator. A new approach is proposed to gradually increase in the resistance of primary winding of dynamic transformer. |
| Author(s): | M. Jafarifar, B. Rezaeealam, A. Mir |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1753 KB |
| Title: | A Novel Chebyshev Series Fed Linear Array with High Gain and Low Sidelobe Level for WLAN Outdoor Systems |
| Abstract: | In this paper, we propose a novel linear microstrip array antenna with high gain and low sidelobe level (SLL) for outdoor WLAN applications. The array antenna includes of two main parts: a linear array and a reflector. Specifically, the array is linearly constructed with 10 elements; those are placed on Rogers RT/Duroid 5870tm substrate with the dimensions of 422×100×10.15 mm3. Furthermore, to acquire the SLL reduction, a series fed network is designed to have the output signals being proportional to the Chebyshev distributions (with the preset SLL of -30 dB). On the optimization of the single element, Yagi antenna theory is applied by adding two directors above each element to increase its directivity. Additionally, we put a reflector at the back side of the proposed array. Simulation results indicate that the array operates well at 5.5 GHz with the high gain of 17.5 dBi and a low SLL of -26 dB. A prototype has been fabricated and measured to validate the simulation results. Good agreement between simulation and measurement data have been obtained. This proves that the presented array antenna can be a good candidate for WLAN applications. |
| Author(s): | T. T. Toan, N. M. Tran, T. V. B. Giang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2589 KB |
| Title: | A Novel Herringbone Circularly Polarized Quasi Lumped Antenna Array |
| Abstract: | Herein, a series herringbone fed traveling wave quasi-lumped circularly polarized antenna array is presented. The proposed quasi-element antenna comprises a narrow strip inductor parallel to the interdigital capacitor. The inductor was placed at the center finger and shorted across the interdigital capacitor with pad capacitors connected at both ends of the structure. Circular polarization was achieved by feeding the quasi elements at the corners with a 90° phase difference along a travelling wave microstrip feed line. The proposed quasi-lumped element antenna has the potential to realize significant size reductions, and it will ultimately be lightweight, small volume, and inexpensive. The antenna characteristics of the array antenna, including return loss and radiation patterns, were characterized. The size of the antenna structure was 21 mm × 38 mm, allowing for potential use in wireless communication systems that use the 5 GHz ISM band. |
| Author(s): | Y. Qasaymeh, K. Issa, A. Alahmadi, M. Othman |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1710 KB |
| Title: | An Estimation Method for the SLF/ELF Field Strength with L-type Horizontal Line-Current Antennas over Inhomogeneous Anisotropic Ground |
| Abstract: | In this study, the radiation characteristics of the control source of extremely low frequency (CSELF) horizontal line-current antennas are studied by the reciprocity theorem. The radiation field strength expressions of the CSELF L-type horizontal line-current antenna are derived on the basis of a field-direction coefficient in the spherical earth-ionosphere cavity. The estimation results of the super low frequency/extremely low frequency (SLF/ELF) wave are provided with regard to the conductivity, the propagation distances and the water-depth. The propagation characteristics of the CSELF wave are calculated under different conditions and are compared to Bannister’s method. The effectiveness of the proposed method is validated by a case study. |
| Author(s): | B. Li, C. Liu, H.-N. Wu, B. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1777 KB |
| Title: | A Low Profile Circularly Polarized Antenna based on Stepped Open-ended Slot Radiator |
| Abstract: | A compact wide band and low profile circularly polarized antenna is presented based on stepped open-ended slotline in this paper. The antenna is composed of four open-end-slotted patchs and a feed network. Four open-end-slotted patchs are sequentially rotated and vertically soldered on the ground plane of the feed network, and are excited by a wide band transition from strip-line to slot-line with short pin in antenna element. The CP radiation of the proposed antenna is realized by four output ports of the feed network which transmit four signals that have equal amplitude with quadrature phase difference (00, 900, 1800, and 2700). Simulation results are compared with the measurements, and a good agreement is obtained. The measured results show that the proposed antenna can provide broad impedance bandwidth of 73.4% (3.5 GHz–7.56 GHz) (reflection coefficient less than -10 dB), a maximum gain of 4.74 dBi, and a 3-dB axial ratio (AR) bandwidth of about 35.1% (3.65 GHz–5.2 GHz). |
| Author(s): | P. Wang, Q. Wu, Y. Shao, D. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1723 KB |
| Title: | Wearable Antennas for Body-Centric Communications: Design and Characterization Aspects |
| Abstract: | Wearable antennas exhibit numerous challenges in terms of design and optimization due to the specific environment in which they operate. Therefore, the design of such antennas is a non-trivial task, as multiple constraints have to be satisfied. We present an algorithm for design-and-optimization of flexible wearable antennas with high radiation efficiency and low specific absorption rate, that takes into account the dielectric loading of the human body. It provides a list of feasible antenna designs, not just a single solution, and identifies the optimal wearable antenna design. Numerical examples on the design and optimization of a wearable antenna (based on a dipole structure with a reflector) to demonstrate the validity and efficiency of the proposed algorithm are given. The optimal antenna design shows robust on-body performance and provides a suitable balance between small antenna size (antenna surface is 2214 mm2), high radiation efficiency (57.73%), and low value of the maximum 10 g average SAR (0.112 W/kg) on a homogeneous semisolid phantom. Finally, the optimal antenna design is fabricated. The antenna performance is studied under different conditions: on a homogeneous semisolid phantom, on a liquid phantom, on a three-layer semisolid phantom, on a human arm and in the free space. A good agreement between simulated and measured antenna performance is observed. |
| Author(s): | A. G. Al-Sehemi, A. A. Al-Ghamdi, N. T. Dishovsky, N. T. Atanasov, G. L. Atanasova |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1835 KB |
| Title: | Modelling Approach to Predict the RFID Read Rates on a Complex Set of Materials |
| Abstract: | This research provides a platform to prove the potential of radio-frequency identification (RFID) technology for use in hypermarket payment systems. A 2.54 GHz ZigBee-based embedded passive and active RFID (EPARFID) system was developed to obtain experimental data and subsequently analyze passive RFID characteristics. A read rate prediction model based on materials permittivity value is proposed. Combining experimental data with analytical electromagnetic models improved the extrapolation of RFID read rates in a given environment. The modelling approach is a step toward the development of a robust methodology to predict RFID read rates on a complex set of materials. Results obtained from the proposed prediction modelling of read rates based on the Friis free space equation by quantifying uncertainties provide new insights into the nature of tag read rates. |
| Author(s): | R. Nalinggam, W. Ismail |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1979 KB |
| Title: | Ultra Wideband Power Divider Design Implementing Microstrip with Slotted Ground |
| Abstract: | This article proposes a compact design of a two-section power divider, which operates over an ultra wideband frequency range of 3-11 GHz. The design approach of microtrip with slotline at the ground plane is applied to reduce the size of the circuit and to achieve wide bandwidth coverage. The rectangular slots are implemented at the ground plane, which is positioned symmetrically underneath the second and third arms of each microstrip quarter-wave transformer to reduce its length up to 33.34%. These attributes lead to an easily fabricated 20 mm x 23 mm compact power divider with a reduced size (by 23.33%). The bandwidth performance is improved up to 19.4% compared to a conventional divider. The design is realized by implementing the Rogers TMM4 substrate and simulated by using CST Microwave Studio. The power divider is verified by using a vector network analyzer (VNA). A good agreement between simulation and fabrication is achieved in terms of return loss, isolation and transmission coefficients across the UWB frequency range. |
| Author(s): | N. Seman, K. H. Yusof, M. H. Jamaluddin, T. A. Rahman |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1840 KB |
| Title: | Optimization Design of Metamaterial Absorbers Based on an Improved Adaptive Genetic Algorithm |
| Abstract: | Most reported metamaterials are designed empirically by parameter sweep, which is time-consuming and ineffective. We propose an optimization method of designing metamaterial absorbers based on an improved adaptive genetic algorithm (IAGA), with the aim to get wideband absorption. Firstly, an IAGA optimization model is presented, of which the crossover probability is adaptively adjusted by introducing a nonlinear function, and the mutation probability is adaptively adjusted using complementary idea. Then, a wideband triple-layer metamaterial absorber in THz region is designed and optimized using IAGA, getting about 40.4% increasing of relative bandwidth compared with the results of reference [19]. A further comparison between IAGA and standard genetic algorithm (SGA) indicates that the IAGA is an effective method in improving convergence speed and stability, and can be used to optimize structure parameters of metamaterial absorbers with desired characteristics. |
| Author(s): | S. Sui, H. Ma, H.-W. Chang, J.-F. Wang, Z. Xu, S.-B. Qu |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1515 KB |
| Title: | Design of Dielectric Resonator Band Stop/Band Pass Filters |
| Abstract: | A square dielectric resonator element (SDR) with a defected ground structure (DGS) is investigated. The proposed DGS is composed of two rectangular slots connected by two transverse slots and is placed in the ground plane. It is fed by a strip line through the substrate layer. The objective of this structure is to design dielectric resonator band-stop filter (DRF) and enhance the performance in terms of better insertion loss and increased bandwidth. The DRF has been fabricated and some measurements are taken. The cutoff frequency of the band- stop filter is 2.25 GHz, with transmission loss of 2-dB. The 3-dB of the band-stop filter is 1.24 GHz. The effect of the transverse slot width on the filter response curve is studied. The same structure is modulated to be frequency reconfigurable DRF to achieve frequency agility by using ideal metallic switches. The cut-off frequency is moved to 1GHz, and the 3-dB bandwidth in 1.5 GHz, while the transmission loss is decreased by 0.75 dB. Finally, the effect of loading SDR with metal plate is investigated. This structure combines the dielectric resonator antenna (DRA) and the DRF to propose dielectric resonator antenna filter (DRAF), this structure is used to miniaturize the global-positioning-system receivers that contain both the antenna and filter. The DRAF has been fabricated and measured, it has 3-dB pass bandwidth in 1GHz. Factors such as return loss, insertion loss, radiation pattern and mutual coupling of DRAF are calculated using finite element method (FEM). Comparison of calculation and measurement factors of DRAF shows a good agreement. |
| Author(s): | N. A. Al-Shalaby, S. M. Gaber |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1636 KB |
| Title: | Design of a Compact Hybrid Branch Line Coupler with 2-D Implementation of Stepped Impedance Transmission Lines of High Impedance Ratio for Wide Range of Harmonic Suppression |
| Abstract: | In this paper stepped impedance transmission line (TL) structure is adopted by using proposed unorthodox technique to design a hybrid branch line coupler (HBLC) in micro-strip technology. In addition to achieving good fractional bandwidth of 30% and size reduction of 56%, the proposed technique ensures a high impedance ratio (M) over a wide range of electrical lengths of the high-Z low-Z (stepped impedance) sections. Maintaining high M ensures a good harmonic suppression of the proposed design up to 9f0 (f0 is the design frequency which is 1GHz for this work). Experimental verification of the proposed technique is demonstrated by designing an HBLC at 1GHz. Experimental and simulation results show excellent conformance. |
| Author(s): | Z. Bedar Khan, G. Mehdi, H. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1536 KB |
| Title: | Effects of Return Stroke Parameters and Soil Water Content on EMF Characteristics |
| Abstract: | Electromagnetic pulses produced by lightning return strokes travel long distances both aboveground and underground. This study investigated the effects of return stroke parameters on electromagnetic propagation over lossy ground. The lightning return stroke channel was modeled using the Modified Transmission Line with Exponential Decay (MTLE) model. Electromagnetics was modeled using a frequency domain solver in the form of finite element analysis via COMSOL software. The studied stroke current parameters were peak, rise time, and decay time. In addition, the effects of soil water content was studied. Aboveground and underground electric and magnetic fields followed and were directly affected by the lightning current waveshape. The underground fields were affected by soil water content. In contrast, the aboveground fields are not affected by water content except for the radial electric field. |
| Author(s): | M. I. Mousa, Z. Abdul-Malek, M. R. M. Esa |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1664 KB |
| Title: | Predicting Radiation of CISPR 25 Complaint ALSE Environment |
| Abstract: | According to the ALSE configuration in CISPR 25, cable bundle is often the dominant radiation structure due to the Common-Mode (CM) current. However this emission test method suffers from a need of a large anechoic chamber. In order to reduce this cost of electronic component development in the EMC test phase, this paper presents a CM current-scan to predict the radiated emissions from 30MHz - 1GHz; moreover, CM-voltage measurement on the cable bundle is also proposed from 150 kHz - 30 MHz. Both methods rely on simple radiating structures and do not take into account the complexity of a real ALSE environment. Therefore a calibration approach based on measured data is proposed to incorporate real influence factors in an anechoic shielded chamber. The proposed approaches are verified by different cable bundles and measurements. Index Terms – ALSE method, cable bundle, CISPR |
| Author(s): | J. Jia, Z. Lai, R. Wang, X. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2202 KB |
| Title: | Design of Metal Mesh THz Filters Exploiting Adjoint Sensitivity Analysis |
| Abstract: | We introduce a novel approach for tuning the bandwidth of metal mesh THz filters. Our approach utilizes the adjoint sensitivity with respect to userdefined shape control parameters. Derivative-based optimization is exploited to evolve the initial template of the filter to a new design which satisfies the design specifications. We suggest a smoothing step for the sharp metallic edges that can be implemented in the final structure. Examples are presented to illustrate the efficiency of the technique in tuning the filter’s bandwidth. |
| Author(s): | A. Y. Elsharabasy, M. H. Bakr, M. J. Deen |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1580 KB |
| Title: | Forecasting of Electromagnetic Radiation Time Series: An Empirical Comparative Approach |
| Abstract: | This study compares the performance of time series models for forecasting electromagnetic radiation levels at Yesilce neighborhood in Mus, Turkey. To make successful predictions using EMF time series, which is obtained in the 36-month measurement process using the calibrated Wavecontrol SMP2 device, nine different models were used. In addition to Mean, Naive, Seasonal Naïve, Drift, STLF and TBATS standard models, more advanced ANN models such as NNETAR, MLP and ELM used in the R software environment for forecasting. In order to determine the accuracy of the models used in the EMF time series used in the study, mean absolute error (MAE), relative mean absolute error (RMAE) metrics were used. The best results obtained with NNETAR, Seasonal Naïve, MLP, STLF, TBATS, and ELM models, respectively. |
| Author(s): | Z. Pala, I. Unluk, E. Yaldiz |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1449 KB |
| Title: | A High Density 16-bit Polarization-Independent Chipless Passive RFID Tag |
| Abstract: | A compact, polarization-independent, chipless, passive Radio Frequency Identification (RFID) tag with 16 bits binary encoding is presented in this paper. The design is prepared with the placement of 16 Convoluted Square Loops (CSLs), in a nested loop arrangement. The proposed CSL structure is formed by inwards semicircular bending of each edge of a square geometry. This configuration not only offers high Quality (Q) factor for each resonance but also polarization independence. The design is fabricated on a 1.6 mm thick FR-4 substrate having an area of 20.8 mm × 10.8 mm. The presented design occupies small area with the bit density of 7.12 bits/cm2 and requires no unit cell repetition for enhancing the Q factor. The tag is tested on the frequency range of 2 to 26 GHz with various E-field polarizations, in order to achieve a polarization independent behavior. |
| Author(s): | A. N. Khan, S. M. Chaudhry, R. Saleem, M. F. Shafique, S. Rehman |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1313 KB |
| Title: | Rotated Stacked Yagi Antenna with Circular Polarization for IoT Applications |
| Abstract: | This letter proposes a rotated stacked Yagi antenna with high directivity and circular polarization. The proposed antenna consists of three elements with a rotation angle and different lengths: a director, a reflector, and a driven element connected to the coaxial feeder. The coaxial feeding is connected to the driven element of the proposed antenna via a LC-balun, and the others are coupled with the driven element. Each stacked element with different lengths is equally rotated at an angle of 60° with respect to the lower element so that the dipole array antenna forms a high directive circular polarization. The size of the proposed antenna is 0.49λ0, × 0.49λ0, × 0.17λ0, at 2.45 GHz and achieved a 10 dB impedance bandwidth of 6.3%, a 3 dB axial ratio bandwidth of 8%, and a peak gain of 4.3 dBic. |
| Author(s): | J.-H. Kim, C.-H. Jeong, W.-S. Lee |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1577 KB |
| Title: | Gain Enhancement of Microstrip Patch Antenna Using Metamaterial Superstrate |
| Abstract: | In this work, a gain enhancement of conventional microstrip patch antenna has been treated for WLAN applications. About 1.3dB gain enhancement, compared to a conventional patch, has been achieved by loading the microstrip patch with a metamaterial superstrate composed of 2x3 array of Square Split Ring Resonator. Simulations have been carried out using Ansys HFSS. Measured results have been taken to validate the simulation result. |
| Author(s): | V. H. Ramegowda, G. M. Achutha, Paramesha |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1301 KB |
| Title: | Dielectric Resonator Antenna Based Dual Port Multiple Input Multiple Output Antenna |
| Abstract: | This paper presents a Dielectric Resonator based dual frequency band Multiple Input and Multiple Output (MIMO) antenna for wireless communication. This antenna is designed for WLAN (5.5─5.8 GHz) and X─band (8─8.1 GHz) applications. A pair of DRAs is placed on a FR-4 substrate and is excited through microstrip feed lines placed on rear side of substrate. A via-less EBG structure is introduced to suppress the mutual coupling among DRAs. The measured isolation among the two antenna ports is 25 dB and 41 dB for 5.6 GHz and 8.05 GHz respectively. The overall dimension of the antenna is 0.72 λ0 × 0.52 λ0 at lower resonant frequency. Simulated and measured results are in good agreement, which supports the potential application of the proposed antenna for high gain WLAN and X─band applications. |
| Author(s): | M. Z. Hameed, S. Majeed, R. Saleem, M. F. Shafique, S. Rehman |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1571 KB |
| Title: | Compact Quad Element UWB-MIMO Antenna with Electronically Reconfigurable WiMAX Band-Stop Capability |
| Abstract: | Miniaturized four port multiple-input multiple-output (MIMO) antenna with electronically reconfigurable WiMAX band-stop capability is proposed for ultra-wideband (UWB) application. The elements of MIMO antenna system exhibit good impedance match (VSWR ≤ 2), while offering high ports isolation (S12 ≤ -20 dB) over the whole ultra-wideband spectrum. Moreover, reconfigurable band-notch capability at WiMAX (3.2-3.8 GHz) frequency band is achieved by switching the PIN diode to ‘ON’ state. The antenna is fabricated and measured as well, and the results suggest that the proposed antenna design with switchable WiMAX band-notch characteristics is a suitable candidate for UWB-MIMO applications. |
| Author(s): | A. Quddus, R. Saleem, M. F. Shafique, S. Rehman |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1398 KB |
| Title: | MACA Algorithm to Accelerate Modeling of Eddy Current Position Sensor |
| Abstract: | In this paper, we proposed a Modified Adaptive Cross Approximation (MACA) algorithm method to model an eddy current probe used as position sensor in Nondestructive Evaluation (NDE). Eddy current based position sensor can be used when optical aids cannot to guide the position of the coil. We use surface integral equation technique with selected Stratton-Chu formulation and apply MACA algorithm to accelerate the calculation of impedance change for the position sensor. Good performance of proposed method is demonstrated with numerical examples. |
| Author(s): | Y. Bao, Z. Liu, J. Song |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 8 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1285 KB |