| Manuscript Title: | Performance Analysis of High Gain Ku Band Square Choke Ring Antenna for Multipath Mitigation |
| Manuscript Id: | IJMOT-2017-10-1406 |
| Abstract: | In recent year’s antenna design appears as a mature field of research. It is really the fact because as the technology grows with new ideas, fitting expectations in the antenna design are always coming up. A Ku-band patch antenna loaded with corner truncations and choke rings has been designed and simulated using Ansoft HFSS 3D electromagnetic simulation tool. Right hand circular polarised operation is obtained from the proposed microstrip antenna. The design was carried out using Rogers RT Duroid 5880 as the substrate and copper as antenna material. The designed antennas resonate at 15GHz with return loss over 20dB & VSWR of 1.75, on implementing truncations in the radiating patch circular polarisation is achieved. The novelty of the proposed antenna is high gain of 9.2 dB and a good front to back ratio which mitigating the multipath signals. The above designed antenna are used in the satellite application for nongeostationary orbit (NGSO) and fixed-satellite services (FSS) providers to operate in various segments of the Ku-band. |
| Authors: | Akhila John.Davuluri, P. Siddaiah |
| Submitted On: | 5/10/2017 |
| Pages: | 188-193 |
| Action: | [Full Paper]
No. of Downloads: 134 |
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| Manuscript Title: | Low Radar Cross Section of Patch Antenna using Shorted Stubs Metamaterial Absorber |
| Manuscript Id: | IJMOT-2017-12-1453 |
| Abstract: | A novel design for the In-band low radar cross section (RCS) of rectangular patch antenna has been proposed. This idea is based on the metamaterial absorber (MMA) composed of shorted stubs and rectangular bars. The RCS of the MMA loaded rectangular patch antenna has been simulated, analyzed and matched with referenced rectangular patch antenna operating at the resonant frequency of 10 GHz. The total thickness of the modified designed absorber is only 0.013?0, where ?0 is the free-space wavelength at the resonant frequency. The result shows a maximum monostatic RCS reduction of 21.22 dBsm achieved for the proposed structure operation at X-band. Analyses have been made for the reflection coefficient (S11) and radiation pattern performances for co-polarization and cross-polarization between referenced and proposed antennas and their performance remains highly preserved. Further, Comparisons are made between the proposed antenna and the previously reported antennas that clearly justify the novelty of the proposed model. |
| Authors: | Dhawan Singh, Viranjay M. Srivastava |
| Submitted On: | 8/12/2017 |
| Pages: | 194-202 |
| Action: | [Full Paper]
No. of Downloads: 76 |
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| Manuscript Title: | Smart Antenna of Microstrip Array for Sector Beamforming for 28GHz Millimeterwave Mobile Communication |
| Manuscript Id: | IJMOT-2017-12-1454 |
| Abstract: | Smart antenna is one of the important key technologies for 4G and 5G mobile communications. In this paper, microstrip antenna array is used for adaptive beam formation of smart antenna. Least mean square (LMS used for beam formation of linear antenna array. The radiation patterns at different angles are presented. Performances of microstrip array in sector beamforming of smart antenna system cellular communication are presented here. Low side lobe levels (SLL) are achieved for 3 cellular network using microstrip array. |
| Authors: | Anwesha Halder, Anupama Senapati, Jibendu Sekhar Roy |
| Submitted On: | 8/12/2017 |
| Pages: | 203-208 |
| Action: | [Full Paper]
No. of Downloads: 62 |
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| Manuscript Title: | Compact Microstrip Antenna Design at 60 GHz for Next Generation Communication Systems |
| Manuscript Id: | IJMOT-2017-12-1462 |
| Abstract: | A 60 GHz unlicensed spectrum promises high-bandwidth for the commercial wireless communication applications. In this work, a rectangular microstrip patch antenna at 60 GHz using inset feeding is designed for the next generation communication system. The suggested antenna will transfer audio and video data up to few gigabits per second. The return loss is found to be 24.77 dB at the operating frequency. The gain and directivity achieved at resonant frequency is 7.654 dB and 7.580 dBi respectively. In addition, slots are introduced to increase the bandwidth of this antenna. Furthermore, the results obtained by C shaped slot and circular ring are optimized. The bandwidth achieved by using C shaped slot is 0.9631 GHz and the bandwidth achieved by using circular ring is 1.005 GHz. The proposed design is designed on low budget RT/duroid 5880 substrate with overall extent as (3.43×3.83×0.04) mm3. |
| Authors: | Ekta Thakur, Naveen Jaglan, Samir Dev Gupta, Shweta Srivastava |
| Submitted On: | 14/12/2017 |
| Pages: | 209-215 |
| Action: | [Full Paper]
No. of Downloads: 71 |
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| Manuscript Title: | Planar Dual Band Electrically Small Antenna for Wireless Applications |
| Manuscript Id: | IJMOT-2017-12-1466 |
| Abstract: | Planar slotted structure is proposed in the paper. An electrically small antenna lying on a low-cost FR4 substrate of standard thickness 1.6mm is presented. The antenna resonates at 2.4 GHz and 3.77 GHz frequencies which are applicable for ISM and WiMAX bands respectively. The antenna is fed using microstrip feed line and it is matched at 50O. In the presented antenna, the slotted structure is introduced to engineer the antenna to make it useful for wireless applications. The simulated results in terms of reflection coefficient (S11) and antenna bandwidth are presented for the proposed structure. The impedance bandwidth of the proposed compact antenna is in order of 8% and 1.5% for WLAN and WiMAX frequencies. The prototype of the proposed antenna is developed, and measured results have good correlation with simulated results. |
| Authors: | Riki Patel, Trushit Upadhyaya |
| Submitted On: | 21/12/2017 |
| Pages: | 216-222 |
| Action: | [Full Paper]
No. of Downloads: 71 |
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| Manuscript Title: | EBG Based Parasitic Coupled U-Slot Antenna for Dual Band and WB Applications |
| Manuscript Id: | IJMOT-2018-2-1491 |
| Abstract: | This article proposes an analytical optimization of dual band performance of a Ushape patch antenna using derivative parasitic pattern. Loading effect of the parasitic element is introduced to obtain the return loss parameters, over the wide range of frequency spectrum.The slot is inserted within the microstrip feed for the\r\noptimization of dual band impedance matching. Meanwhile, the ground modification helps to reduce surface wave scattering. The patch is analyzed for U-shape geometry with slotted strip line matching for UWB applications of IEEE standards, while the effect of parasitic elements, over the realized geometry, enables the antenna to be encrypted within the two specific dual bands. The overall structure is realized on EBG inserted\r\nground surface with optimized patch dimensions. The observation is quite significant over the 0 to 360 degree for theta and phi angels for radiation pattern of the proposed structure. Proposed antenna geometry is fabricated on commercially available FR-4 material with dielectric constant 4.4, thickness 1.6 mm. The antenna structure is simulated to optimize the feed matching in order to execute the fabrication of valid design and in fact the measured results are very close to falling within the desired band of operation from 2.9\r\nGHz. to 7.3 GHz. and 9.1 GHz. to 10.7 GHz. band, providing the multiplicity of applications. The core objective of the design of the proposed antenna from a basic U-shape structure is executed successfully through simulated and measured |S11| parameters. Simultaneously the radiation patterns in E and H plane give satisfactory far field distributions to justify the utility of the proposed model for desired UWB applications with appropriate band rejection property. |
| Authors: | Pankaj Kumar Goswami, Garima Goswami, Sudhir Kumar Sharma |
| Submitted On: | 4/2/2018 |
| Pages: | 223-230 |
| Action: | [Full Paper]
No. of Downloads: 70 |
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| Manuscript Title: | Performance of Hybrid OCDMA/WDM System with DPSK Modulation and NAND Detection Technique for GPON |
| Manuscript Id: | IJMOT-2017-12-1458 |
| Abstract: | A hybrid optical code division multiple access (OCDMA) and wavelength division multiplexing (WDM) system with differential phase shift keying (DPSK) modulation and NAND subtraction detection technique for 2.5Gbps Optical Network is proposed for improving system reach, capacity, security, and robustness. The performance, evaluated by simulation, show that the proposed system can increase transmission rate at a decreased average received optical power. Obtained results predict that the proposed OCDMA/WDM system with NAND subtraction detection technique can achieve up to 12km fiber distance with error-free transmission value of 10-11 compared to conventional 8km fiber distance at a minimum power of -27.24 dBm. The system can be considered as a promising solution for high-speed high throughput Gigabit Passive Optical Networks (GPON) as well as for optical access networks. |
| Authors: | N. Ahmed, M. A. Rashid |
| Submitted On: | 12/12/2017 |
| Pages: | 231-237 |
| Action: | [Full Paper]
No. of Downloads: 40 |
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| Manuscript Title: | Microwave Photonic System with Phased Array Antenna |
| Manuscript Id: | IJMOT-2017-12-1469 |
| Abstract: | ? microwave photonic system with phased array antenna is presented. The system consists of three parts: DAC/ADC blocks generating digital data over signal of microwave frequency (5.3 GHz) via IQ-modulator/demodulator schemes, photonic transceiver providing modulation/demodulation of an optical carrier (wavelength 1550 nm) and microwave beamforming block which includes 2D array antenna with beam switching possibility. |
| Authors: | Roman Platonov, Aleksander Yastrebov, Andrey Altynnikov, Anatoliy Mikhailov, Olga Kozyreva, Vitaliy Osadchiy, Andrey Kozyrev |
| Submitted On: | 27/12/2017 |
| Pages: | 238-243 |
| Action: | [Full Paper]
No. of Downloads: 40 |
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| Manuscript Title: | Modeling and Analysis of Z Folded Solid State Laser Cavity with Two Curved Mirrors |
| Manuscript Id: | IJMOT-2018-4-1543 |
| Abstract: | This paper introduces the modeling of a Z-shaped folded four mirror solid state laser cavity, with two flat feedback end mirrors and two curved mirrors at the two ends of the crystal plate, using Ray Transfer Matrix. Although Ti3+:Al2O3 isused as compensated crystal plate in this analysis, this model is equally useful for the specified Z-shaped folded four mirror cavity irrespective of crystal material. It is found that the stability and output beam parameters of the two curved mirrors Z folded cavity do not depend on the position of the compensated crystal plate along the focusing arm. The effect of crystal plate length variation on the state of stability in a stable cavity is analyzed. The responses of the stability region and beam spot size with the variation of the cavity parameters are also analyzed. This simplified concise model will help the designer to determine the cavity parameters to meet the stability condition and output beam parameters carefully. |
| Authors: | Sree Nirmillo Biswash Tushar, Susanta Dev Nath, Jobaida Akhtar, Mohammad Istiaque Reja |
| Submitted On: | 14/4/2018 |
| Pages: | 244-253 |
| Action: | [Full Paper]
No. of Downloads: 137 |
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