| Manuscript Title: | Emergence of T-Rays: Design of Low-loss Waveguides and Devices |
| Manuscript Id: | IJMOT-2014-1-526 |
| Abstract: | A rigorous full-vectorial modal solution approach based on the finite element method is used to find the propagation properties of THz waveguides. Design approaches are presented to reduce the modal loss. Design of several THz devices, including quantum cascade lasers, power splitters and narrow-band filters are also presented. |
| Authors: | B.M.A. Rahman, C. Themistos, H. Tanvir, M. Uthman, A. Quadir, C. Markides |
| Submitted On: | 12/1/2013 |
| Pages: | 1-5 |
| Action: | [Full Paper]
No. of Downloads: 21 |
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| Manuscript Title: | Robust GaN MMIC Chipset for T/R Module Front-End Integration |
| Manuscript Id: | IJMOT-2014-1-527 |
| Abstract: | In this contribution, a set of robust GaN MMIC T/R switches and low-noise amplifiers, all based on the same GaN process, is presented. The target operating bandwidths are the X-band and the 2-18 GHz bandwidth. Several robustness tests on the fabricated MMICs demonstrate state-of-the-art survivability to CW input power levels. The development of high-power amplifiers, robust low-noise amplifiers and T/R switches on the same GaN monolithic process will bring to the next generation of fully-integrated T/R module front-end MMICs. |
| Authors: | Ernesto Limiti, Sergio Colangeli, Andrea Bentini, Walter Ciccognani |
| Submitted On: | 12/1/2013 |
| Pages: | 6-12 |
| Action: | [Full Paper]
No. of Downloads: 23 |
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| Manuscript Title: | GaN Power Amplifiers: Results and Prospective |
| Manuscript Id: | IJMOT-2014-1-528 |
| Abstract: | This article is focused on GaN-based power amplifiers for applications up to 10 GHz. Several PAs developed in both MMIC and hybrid technologies for different RF and microwave frequency bands will be described. In particular, the designs of two ultra-wideband (UWB) PAs are reported together with experimental results. The first one is based on commercial GaN-on-SiC technology while the other one is developed exploiting a GaN-on-Si technology. Examples of GaN-based Doherty PAs for cellular base-stations are also discussed and state-of-the-art performances are reported. Finally, a GaN MMIC PA for Synthetic Aperture Radar (SAR) systems at X-Band is described with related experimental investigation. |
| Authors: | Rocco Giofrè, Luca Piazzon, Paolo Colantonio, Elisa Cipriani, Franco Giannini |
| Submitted On: | 12/1/2013 |
| Pages: | 13-19 |
| Action: | [Full Paper]
No. of Downloads: 17 |
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| Manuscript Title: | Simulation of a Novel Design Fractal Tree Antenna for Multiband Applications with Reconfigurability at 5.4GHZ |
| Manuscript Id: | IJMOT-2014-1-529 |
| Abstract: | This paper presents the new shape of fractal tree antenna for multiband applications by reconfigure the shape of fractal tree antenna using PIN diode switches. The proposed antenna covers the service bands such as WLAN (4.9-5.8) GHz and Wi-MAX (3.2- 3.8) GHz during its operation and also operates some other frequencies between 3.12GHz to 5.4GHz. The designed antenna is reconfigured by using PIN diodes. |
| Authors: | V. R. Anitha, Malli. Yuva Sindhu |
| Submitted On: | 12/1/2013 |
| Pages: | 20-23 |
| Action: | [Full Paper]
No. of Downloads: 26 |
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| Manuscript Title: | On the Feasibility of the Complementary Strip-Slot Element to Build Planar Series-fed Arrays |
| Manuscript Id: | IJMOT-2014-1-530 |
| Abstract: | In this contribution, the main characteristics of the so-called complementary strip-slot radiating element are reviewed and its feasibility for building planar series-fed arrays is analyzed. This microstrip radiator was recently introduced by the authors as a modified microstrip-fed slot that presents wide impedance bandwidth. The main aspects to be considered when building series-fed arrays with the strip-slot element are studied and two different array configurations are described as examples of its potential: a linear traveling-wave array with full-space frequency-scanning capability and a ring array with circular polarization at multiple bands. |
| Authors: | Elena Abdo-Sánchez, Teresa M. Martín-Guerero, Juan E. Page, Jaime Esteban, Carlos Camacho-Peñalosa |
| Submitted On: | 12/1/2013 |
| Pages: | 24-28 |
| Action: | [Full Paper]
No. of Downloads: 20 |
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| Manuscript Title: | A Compact Coupled-Line Multiband Microstrip Antenna |
| Manuscript Id: | IJMOT-2014-1-531 |
| Abstract: | A multiband microstrip antenna is proposed in this paper. By using a circular slot at the ground plane, the circular radiation at the antenna frequency resonances has been achieved. A patch is designed with a coupled U-shaped line. To gain resonance at the lower frequency, a microstrip line is introduced at the middle of the circular slot. The assessment of the proposed antenna shows good agreement for gaining circular radiation pattern. |
| Authors: | Md. Rokunuzzaman, M. T. Islam, Baharudin Yatim, Mhd Fairos Asillam |
| Submitted On: | 12/1/2013 |
| Pages: | 29-33 |
| Action: | [Full Paper]
No. of Downloads: 22 |
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| Manuscript Title: | Specific Absorption Rate in Mothers and Fetuses in the Second and Third Trimesters of Pregnancy |
| Manuscript Id: | IJMOT-2014-1-532 |
| Abstract: | Recently, there has been increasing concern regarding the safety of exposure to RF electromagnetic fields in pregnant females and their fetuses. In this study, we acquired fetal magnetic resonance imaging at 20 26 and 29 weeks from a healthy volunteer of pregnancy and developed the pregnant female models at those weeks of pregnancy by combining the fetal models constructed on the basis of the fetal MRI data and an existing non-pregnant female model. We also estimated the specific absorption rates in those models for whole-body exposure to radio-frequency electromagnetic fields using the finite-difference time-domain method. |
| Authors: | Tomoaki Nagaoka, Tetsu Niwa, Soichi Watanabe |
| Submitted On: | 12/1/2013 |
| Pages: | 34-38 |
| Action: | [Full Paper]
No. of Downloads: 25 |
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| Manuscript Title: | Dielectric Characterization of Ethanol and Sugar Aqueous Solutions for Potential Halal Authentication |
| Manuscript Id: | IJMOT-2014-1-533 |
| Abstract: | A potential method for detection and discrimination of alcoholic containing drinks for halal authentication using dielectric properties has been investigated. Behaviors of several concentrations of ethanol solutions in water were studied for verification purpose. The addition of three types of sugar namely sucrose, glucose and fructose show the effect and changes to dielectric properties of solutions. Dielectric constant and dielectric loss factor for each samples were measured over the microwave frequency from 0.5 to 50 GHz. The results showed that dielectric properties manage to discriminate alcohol content until the lowest concentration studied of 0.5% in water mixture. Beyond this limit, solution is considered as alcoholic drinks. |
| Authors: | Zurina Zainal Abidin, Fatin Nordalila Omar, Dayang Radiah Awang Biak |
| Submitted On: | 12/1/2013 |
| Pages: | 39-43 |
| Action: | [Full Paper]
No. of Downloads: 21 |
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| Manuscript Title: | Novel Active Distributed Circulator |
| Manuscript Id: | IJMOT-2014-1-534 |
| Abstract: | In this contribution a novel distributed circulator topology based on the integration of three active quasi-circulators is proposed. A 3 by 3 mm2 monolithic test vehicle was designed to verify the effectiveness of the approach. The MMIC demonstrator exhibits a return loss better than 10 dB while insertion loss and isolation are better than 1 dB and 15 dB respectively. Achieved operating bandwidth is 40% around the 6 GHz central frequency. |
| Authors: | Diego Palombini, Mirko Palomba, Walter Ciccognani, Ernesto Limiti |
| Submitted On: | 12/1/2013 |
| Pages: | 44-48 |
| Action: | [Full Paper]
No. of Downloads: 20 |
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| Manuscript Title: | Inverse Class-F Power Amplifier Using Slot Resonators as a Harmonic Filter |
| Manuscript Id: | IJMOT-2014-1-535 |
| Abstract: | In this contribution, an inverse-class-F (F-1) power amplifier at 1.7 GHz using GaN device is proposed and experimentally tested. The novelty in the design is the use of a three-layers rectangular slot resonators in microstrip line’s ground plane as harmonic filter. In particular, a planar periodic structure composed by two different slot resonators is used to control 2nd, 3rd harmonics and to match to 50 ? the fundamental frequency. Experimental results shows 60 % of drain efficiency and roughly 4 W of output power with 13 dB of associated gain. |
| Authors: | Yu.V. Rassokhina, V. G. Krizhanovski, P. Colantonio, R. Giofrè |
| Submitted On: | 12/1/2013 |
| Pages: | 49-53 |
| Action: | [Full Paper]
No. of Downloads: 17 |
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| Manuscript Title: | An Experimental Study of UAV Motion Sensing using GPS Aided MEMS Inertial Sensor |
| Manuscript Id: | IJMOT-2014-1-536 |
| Abstract: | Due to the nature of Micro-Electro-Mechanical System (MEMS) inertial sensor, its outputs are normally being jeopardized by measurement errors. A common practice to regulate the MEMS inertial measurements into usable motion data is by fusing the Global Positioning System's (GPS) measurement with the MEMS inertial measurement through Kalman filter. Such integrated system is known as GPS aided MEMS Inertial Navigation System. Note that the robustness of such integrated system is heavily relied on the accuracy of the modelling of stochastic error of MEMS inertial sensor. In this paper, the on-board motion sensing experimental of the GPS aided MEMS Inertial Navigation System implemented on an Unmanned Aerial Vehicle (UAV) airplane is carried out. The results of two different stochastic noise models implementation, namely the Gauss-Markov (GM) Model and Autoregressive (AR) Model, are studied and compared. Results of short intervals (20 seconds) of no GPS condition are studied as well. The outcomes indicate that the stochastic noise model using AR modelling produces better estimation results than GM modelling. |
| Authors: | Lim Chot Hun, Lim Tien Sze, Koo Voon Chet |
| Submitted On: | 12/1/2013 |
| Pages: | 54-58 |
| Action: | [Full Paper]
No. of Downloads: 18 |
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| Manuscript Title: | A High Resolution Ultra Wideband Positioning System |
| Manuscript Id: | IJMOT-2014-1-537 |
| Abstract: | This paper presents an algorithm for target localisation in an open space using ultra wideband (UWB) radar. It discusses why localisation is needed and justifies the use of UWB radar in the positioning system. It also discusses the method used to localize the target as well as the problems encountered using said method. Experimental results on a simple open space target localisation are also presented in this paper. |
| Authors: | Lee Loong Wei, Chan Yee Kit, Koo Voon Chet |
| Submitted On: | 12/1/2013 |
| Pages: | 59-63 |
| Action: | [Full Paper]
No. of Downloads: 16 |
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| Manuscript Title: | Design of a High Isolation Dual Polarized\r\nS-band Microstrip Patch Antenna |
| Manuscript Id: | IJMOT-2014-1-538 |
| Abstract: | An isolation enhanced dual polarized microstrip patch antenna has been designed for S-band Synthetic Aperture Radar. This antenna operates at 3.125 GHz with operating bandwidth of 150 MHz or 4.8%. The electromagnetic power is coupled from the feed line to radiating patch through proximity coupling feeding technique for better bandwidth achievement. A centre ground-shorted microstrip line is created at the feeding layer to enhance the isolation of the input ports. The simulation result illustrates the effect of the ground shorted microstrip line to the isolation of horizontal and vertical polarizations. |
| Authors: | P.N. Tan, Y. K. Chan, Gobi. V, T. S. Lim, H.T. Chuah |
| Submitted On: | 12/1/2013 |
| Pages: | 64-67 |
| Action: | [Full Paper]
No. of Downloads: 19 |
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| Manuscript Title: | Study on Geometric Correction Algorithms for SAR Images |
| Manuscript Id: | IJMOT-2014-1-539 |
| Abstract: | Geometric correction is an important step in the Synthetic Aperture Radar (SAR) image processing. A SAR image has to be geocoded before it is usable for further processing or information extraction. There are three major processes involved in a typical geometric correction: error modeling, ground control point selection and image transformation. In this paper, a study on four geometric correction methods namely global polynomial model, 2D direct linear transformation model, hybrid model and genetic algorithm with global polynomial model will be presented. By choosing appropriate ground control points, these geometric correction methods are applied onto an actual UAV SAR data for performance evaluation using root mean square error technique. |
| Authors: | A.L. Choo, Y.K. Chan, V.C. Koo, T.S. Lim |
| Submitted On: | 12/1/2013 |
| Pages: | 68-72 |
| Action: | [Full Paper]
No. of Downloads: 18 |
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| Manuscript Title: | A 1.1~2.4 GHz Broadband QVCO with 74% Fractional Bandwidth for DVB Tuner Applications |
| Manuscript Id: | IJMOT-2014-1-540 |
| Abstract: | This work develops a broadband quadrature voltage-controlled oscillator (QVCO) for digital video broadcasting (DVB) tuner applications. The QVCO is mainly based on a balanced voltage-controlled oscillator (VCO), which is a combination of two single-ended VCO. Two active ports and two resonant tanks balance the phase of outputs and also increase the operating range. Experimental results show that the proposed broadband QVCO achieves a 1.1 ~ 2.4 GHz wide tuning range with a 74 % fractional bandwidth. The phase noise and quadrature-phase error are respectively lower than -109 dBc/Hz at 100 kHz offset frequency and 5 degrees over the 1.3 GHz operating bandwidth. |
| Authors: | Kang-Chun Peng, Gi-Horng Liu |
| Submitted On: | 12/1/2013 |
| Pages: | 73-77 |
| Action: | [Full Paper]
No. of Downloads: 17 |
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| Manuscript Title: | Design Procedure for Compact Asymmetric SPDT Switches and Full X-Band Demonstrator |
| Manuscript Id: | IJMOT-2014-1-541 |
| Abstract: | A design procedure for asymmetric SPDT switches is proposed and validated by a MMIC demonstrator covering the full X-Band, well suited to integration in T/R modules. The demonstrator exhibits 0.7 dB and 1.6 dB insertion loss along its TX and RX paths, respectively, and 21.5 dB isolation in TX mode. Chip size is as compact as 1 ? 1 mm2. |
| Authors: | Mirko Palomba, Riccardo Cleriti, Sergio Colangeli, Ernesto Limiti |
| Submitted On: | 12/1/2013 |
| Pages: | 78-82 |
| Action: | [Full Paper]
No. of Downloads: 16 |
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| Manuscript Title: | Design and Implementation of Ambient RF Energy Harvesting Circuits |
| Manuscript Id: | IJMOT-2014-1-542 |
| Abstract: | This paper presents design strategies and measurements of two RF energy harvesting circuits working at UHF frequencies (around 480 MHz). Ambient RF sources are considered so for the circuit designs low power levels have been assumed. The circuits were implemented and the RF/DC conversion efficiency was measured. |
| Authors: | Walter Ciccognani, Sergio Colangeli, Mirko Palomba, Ernesto Limiti, Lucio Scucchia |
| Submitted On: | 12/1/2013 |
| Pages: | 83-87 |
| Action: | [Full Paper]
No. of Downloads: 16 |
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| Manuscript Title: | Distributed Amplifiers in MMIC Technology based on Composite Right/Left-Handed Transmission Lines |
| Manuscript Id: | IJMOT-2014-1-543 |
| Abstract: | Three MMIC distributed amplifiers based on Composite Right/Left-Handed Transmission Lines are presented in order to illustrate the actual performance of these devices, and the features that can be obtained with this distributed amplifier topology. Measurement results and/or qualified simulations have been included for two amplifiers with dual-band performance and for a high-power one. Also different frequency bands are illustrated, with examples at X-, C- and S-band operation. |
| Authors: | Teresa M. Martín-Guerero, Diego Palombini, Francisco J. Mata-Contreras, Andrea Bentini, Francisco Y. Ng-Molina, Ernesto Limiti, Carlos Camacho-Peñalosa |
| Submitted On: | 12/1/2013 |
| Pages: | 88-92 |
| Action: | [Full Paper]
No. of Downloads: 16 |
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