| Manuscript Title: | Design of Highly Compact Circular Microstrip Patch Antenna Using Slot in the Ground Plane for Potential WiMAX Application at 2.5GHz |
| Manuscript Id: | IJMOT-2019-7-1800 |
| Abstract: | Circular microstrip patch antenna on the substrate glass PTFE ( ) with thickness h=1.6mm is designed to radiate at 5.828GHz with maximum gain of about 6dBi. A rectangular slot is then cut in the ground plane without altering the dimensions of antenna so as to make antenna radiate at 2.5GHz with a gain of 0.3dBi with almost omni directional radiation pattern thus providing miniaturization. Size reduction of about 81.6% is achieved. This antenna may be useful in WiMAX applications. |
| Authors: | Amit Kumar Varshney, P. Soni Reddy, Rahul Mondal, Partha Pratim Sarkar |
| Submitted On: | 16-07-2019 |
| Pages: | 1-9 |
| Action: | [Full Paper]
No. of Downloads: 122 |
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| Manuscript Title: | An Accurate Method to Estimate Complex Permittivity of Dielectric Materials at X-band Frequencies |
| Manuscript Id: | IJMOT-2019-8-1812 |
| Abstract: | In this paper, a measurement method is presented to estimate the complex permittivity of a dielectric material even if its length is higher than the half wavelength in the waveguide. The Sij-parameters at reference planes in the rectangular waveguide loaded by material sample are measured by Network Analyzer. First of all, the expression of the complex permittivity as a function of Sij-parameters are calculated by applying the transmission lines theory. Further, a comparison of the estimated values of the complex permittivity obtained from the presented method and the Nicholson-Ross method is presented. Finally, the results for complex permittivity of Teflon, Nylon and Verde measured at the X-band frequencies are presented.
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| Authors: | Lahcen AIT BENALI, Abdelwahed Tribak, Jaouad Terhzaz, Angel Mediavilla |
| Submitted On: | 01-08-2019 |
| Pages: | 10-16 |
| Action: | [Full Paper]
No. of Downloads: 37 |
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| Manuscript Title: | New dual stop-bands EBG-DGS structure and its application in antenna for lower bands 5G |
| Manuscript Id: | IJMOT-2019-9-1835 |
| Abstract: | In this paper, a compact design, which consists of a comb-shape EBG and DGS structures, is proposed to achieve both miniaturization of the unit cell and dual stop-bands for the frequency range of 2.75-3.84GHz and 4.3-7.3GHz. These bands cover lower bands of 5G as well as the operating bands for IEEE 802.11ac and LTE/LTE-A. By integrating this structure in a dual-band MIMO fractal monopole antenna design, the mutual coupling effect was decreased significantly to -48dB at the first band and -33dB at the second one without harming the antenna’s performance. Simulation and the measurement results were presented to validate the design. |
| Authors: | Duong Thi Thanh Tu, Nguyen Van Tan, Nguyen Viet Hung, Vu Van Yem |
| Submitted On: | 25-09-2019 |
| Pages: | 17-25 |
| Action: | [Full Paper]
No. of Downloads: 76 |
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| Manuscript Title: | Analysis and Design of a New Miniature Microstrip BPF Based on Metamaterial and Dumbbell DGS |
| Manuscript Id: | IJMOT-2019-10-1844 |
| Abstract: | This paper presents a new compact miniature microstrip ultra-wide bandpass filter. The proposed BPF is developed to cover UMTS, ISM, WiMAX, DCS and PCS band applications. The design approach is based to convert a classical low pass filter to a bandpass filter without using the conventional transformations. The circuit is
designed on the flame resistant 4 substrate and its electrical performances are improved by etching two type of resonators on the bottom side of the
structure. The first one is the dumbbell-shaped defected ground structure which was firstly studied and analysed. The second is the complementary split ring resonator which is very useful to achieve a small filter area with an ultra-bandwidth, an
excellent transmission and, a good attenuation. The achieved results are validated by two different electromagnetic solvers. |
| Authors: | Badr Nasiri, Abdelhadi Ennajih, Ahmed Errkik, Jamal Zbitou, Mounir Derri |
| Submitted On: | 04-10-2019 |
| Pages: | 26-33 |
| Action: | [Full Paper]
No. of Downloads: 55 |
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| Manuscript Title: | The Modeling of the Transfer Impedance of a Shielding with n Screens |
| Manuscript Id: | IJMOT-2019-10-1847 |
| Abstract: | In an industrial site, the increase of the number of wireless equipment and links using and producing electromagnetic energy causes a serious problem of electromagnetic interference. The proper functioning of the conductors depends essentially on the sensitivity of the conductor itself and the quality and the connection method of the cable shields. This type of problem highlights the interest of knowing precisely the disturbing voltages that may appear in the cables according to the frequency spectrum of the disturbance. In this context, and with a view to effectively dealing with the problems of high-frequency electromagnetic compatibility, interest is being shown to the diffusion of the tangential component of the electric field in the conductive material constituting the shielding, namely the transfer impedance. |
| Authors: | Senhaji Rhazi Kaoutar,Najmouddine Mohamed, Mejdoub Youssef, Wahabi Aicha |
| Submitted On: | 14-10-2019 |
| Pages: | 34-43 |
| Action: | [Full Paper]
No. of Downloads: 34 |
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| Manuscript Title: | Optimized design of Two Section Branch Line Coupler For Future 5G Applications |
| Manuscript Id: | IJMOT-2019-11-11854 |
| Abstract: | This study presents a Two Section Branch Line Coupler (BLC). It has been designed with center frequency of 28 GHz for the future fifth generation (5G applications), and optimized using Tuning Space Mapping. The simulated results of this BLC show within the frequency range of 26 and 30 GHz, a return loss less than -35 dB, coupling coefficient of 3 ± 1 dB, the simulated transmission coefficient S12 is -5 ± 1 dB ,and a phase difference between output ports of 90°± 10° across the frequency range of 26.84 and 30 GHz. |
| Authors: | Ayyoub Elberbri, Adil Saadi Seddik Bri |
| Submitted On: | 11-11-2019 |
| Pages: | 44-50 |
| Action: | [Full Paper]
No. of Downloads: 97 |
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| Manuscript Title: | A Printed CPW-FED Ultra-WideBand Planar Inverted-F Antenna |
| Manuscript Id: | IJMOT-2019-11-11856 |
| Abstract: | This paper presents a co-planar waveguide (CPW) fed compact ultra-wideband (UWB) antenna. The proposed antenna consists of a folded patch inverted-F antenna and a grounded stub to radiate over the quad-frequency band. The UWB (3.1-10.6GHz) characteristics are achieved by modifying the ground plane. The proposed printed antenna is compact in nature with the total dimensions of 24×16×1.59 mm3 and operates over the frequency range between 3.08–11.02 GHz for UWB communications. The antenna gives an impedance bandwidth of 112.62% with a highest efficiency of 91% and variation of gain from 2-4dB. The prototype of the antenna was constructed and measured. |
| Authors: | Anupa Chatterjee, Monojit Mitra |
| Submitted On: | 12-11-2019 |
| Pages: | 51-57 |
| Action: | [Full Paper]
No. of Downloads: 40 |
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| Manuscript Title: | A Cost-Effective Variable Coupler with Sliding Printed Circuit Boards |
| Manuscript Id: | IJMOT-2019-11-11858 |
| Abstract: | A variable coupler has been designed and implemented utilizing two pieces of printed circuit boards (PCB) in edge-coupled configuration. The coupling amount is tuned by varying the spacing of two edge-coupled striplines. The proposed variable coupler by sliding two PCBs achieves 10 to 30 dB coupling with the spacing of 0.1 to 5.1 mm, while ensuring 50-O terminations at each port. Two PCBs have identical structure and dimension, which are based on microstrip lines. Each PCB has been implemented with the low-cost FR-4 dual-sided PCBs of which thickness is 2.4 mm. The proposed coupling architecture with two flipped and overlapped PCBs provides a simple and intuitive implementation by having a variable edge-coupled striplines. |
| Authors: | Dong-Ho Lee, Jusung Kim, Ockgoo Lee, Chang-Seok Lee |
| Submitted On: | 17-11-2019 |
| Pages: | 58-63 |
| Action: | [Full Paper]
No. of Downloads: 30 |
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| Manuscript Title: | Design of Compact Stub Loaded Printed Filtering Antenna with High Selectivity for Wireless applications |
| Manuscript Id: | IJMOT-2019-11-11862 |
| Abstract: | This paper presents the design and parametric analysis of compact and high selectivity stub loaded printed filtering antenna for wireless applications. A compact Chebyshev band pass filter was first implemented by replacing the coupled sections of the conventional parallel coupled filter by the short circuit stub resonator. The last resonator of the stub loaded filter was then replaced by the inverted L monopole antenna so that the structure could exhibit both radiating and filtering characteristics. The equivalent circuit of the proposed filtering antenna was derived from the typical band pass filter model. 5th order Chebyshev band pass filtering antenna centered at 2.45 GHz was designed and fabricated. The proposed integrated filtering antenna could eliminate the need for impedance matching network between the filter and the antenna, thereby reducing the size and losses. The proposed filtering antenna has high selectivity of 76.83 / 87.75 dB/GHz and flat gain of 3.1 dBi in the pass |
| Authors: | Nithya Dorairajan and Chitra M.Perumal |
| Submitted On: | 19-11-2019 |
| Pages: | 64-72 |
| Action: | [Full Paper]
No. of Downloads: 59 |
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| Manuscript Title: | New Empirical Formula of Capacitance in General Microstrip Antenna |
| Manuscript Id: | IJMOT-2019-11-11870 |
| Abstract: | This paper presents an approach to create a new empirical capacitance formula that is useful for impedance calculations in a variety of microstrip antenna structures. This formula is the term of fringing field. This approach is based on effort to increase the accuracy of Love’s capacitance formula so it approaches the exact capacitance value of the parallel-plate capacitor due to Palmer. In this method, modifying Love’s capacitance formula was performed by separating the capacitance into the term of the main field and fringing field. The new empirical capacitance formula consists of two arbitrary constants, formulated by involving Hilberg’s elliptic functions. The two arbitrary constants of the capacitance formula were determined by linear regression using experimental data of capacitance obtained from Palmer’s capacitance formula. The calculation results of the new empirical formula are more accurate than the existing approximate capacitance formulas. |
| Authors: | Yono Hadi Pramono, A. Y. Rohedi |
| Submitted On: | 29-11-2019 |
| Pages: | 73-79 |
| Action: | [Full Paper]
No. of Downloads: 46 |
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| Manuscript Title: | Calculation of Quality Factor of a Rectangular Reentrant Cavity |
| Manuscript Id: | IJMOT-2020-1-11899 |
| Abstract: | High frequency klystrons mostly use rectangular reentrant cavities. A simple approach for calculation of unloaded quality factor of a rectangular double reentrant klystron cavity with cylindrical ferrule was developed, by the way of transforming the rectangular reentrant cavity geometry to that of an equivalent cylindrical reentrant cavity and then using the Wheeler’s incremental inductance method. The proposed analysis was validated against the results obtained from the 3D electromagnetic simulation, existing rigorous analysis as well as from the measurements. |
| Authors: | Ashok Bansiwal, Sushil Raina, K. J. Vinoy, Subrata Kumar Datta |
| Submitted On: | 11-01-2020 |
| Pages: | 80-84 |
| Action: | [Full Paper]
No. of Downloads: 30 |
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| Manuscript Title: | Performance Evaluation of PSK All optical OFDM System Based on Arrayed Waveguide Grating under Different Weather Conditions |
| Manuscript Id: | IJMOT-2019-10-11848 |
| Abstract: | All optical orthogonal frequency division multiplexing (AO-OFDM) technology has?paved a?new path?for transmission in the optical domain at higher data levels with sufficient signal spacing resulting in orthogonal transmission between the subcarriers. This paper proposes an empirical model to test the performance of the Phase Shift Keying for all optical orthogonal frequency division multiplexing (AO-OFDM) through optical wireless channel (OWC). This research analyzes the transmission quality of 8PSK-AO-OFDM-OWC under different weather conditions. Simulation is calculated and evaluated for the constellation diagrams, bit error rate (BER), and the Q factor of the received signals. The effect of the outdoor wireless optical communication system atmospheric attenuation has been induced such as rain?and?fog in all three cases (light, medium?, heavy) to determine their effects on the wavelength of the system performance carrier. The?results?show the Q factor, BER and?constellation diagram for different transmission distances under different weather conditions using Phase Shift Keying (PSK) all optical-OFDM-OWC. |
| Authors: | Ali hayder Abdul kareem |
| Submitted On: | 27-10-2019 |
| Pages: | 85-94 |
| Action: | [Full Paper]
No. of Downloads: 114 |
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