Current Issue : April - June Volume : 2016 Issue Number : 2 Articles : 6 Articles
In this paper design and analysis of circular disk microstrip patch antenna with slots and some terms related to design aspects and detail study of proposed antenna is presented. Here an open ring slot is introduced in circular patch which provides dual frequency response with good return loss and wide bandwidth. The antenna is analyzed using Finite Element Method (FEM) based High Frequency Structure Simulator (HFSS™ V13.0.2- EM simulator software). The antenna is designed to operate in C band with dual frequency response. Return loss (S11), voltage standing wave ratio (VSWR), radiation patterns (both E-plane and H-plane) graphs are presented here for simulated antenna. Results of proposed antenna structure shows good return loss, VSWR (<2) and gain. The antenna proposed in this article is suitable for wireless communication applications such as satellite communication and synthetic aperture radar (SAR)....
A novel antenna array architecture for low-cost and compact SATCOM mobile terminal is presented. Based on equal-amplitude\naperiodic phased array with fewer active chain numbers, it possesses advantages including lower weight, less cost, and higher power\nefficiency compared to conventional periodic phased arrays. It is implemented with printed patch antenna so that it guarantees\ncompactness. The elements position and dimensions are jointly designed, with an effective sparse array synthesis strategy that\ntakes actual patch antenna design constraint into consideration, to obtain a maximum array aperture efficiency. Executable and\npractical approach for variable dimension patch antenna designing, including defect substrate element and small scale array, is\nintroduced and utilized to implement proposed sparse array. Full-wave simulation results demonstrate the advantages of proposed\narray antenna as well as the effectiveness of corresponding design approach....
This paper proposes a compact microstrip patch antenna for operating in 2.4ââ?¬â?°GHz ISM and 3.5ââ?¬â?°GHz WiMAX bands with circularly polarized (CP) radiation. The CP radiation in dual-bands is a result of two multilayered truncated corner stacked square patches, while the reactive impedance surface (RIS) is used for antenna size miniaturization for the lower operating frequency band. Since the overall lateral antenna dimensions are controlled by the lower frequency band (higher wavelength), reducing the electrical size of the antenna for lower band results in overall smaller antenna dimensions. The measured 3-dB axial ratio bandwidths of the in-house fabricated antenna prototype are 6.1% (2.40ââ?¬â??2.55ââ?¬â?°GHz) for the lower band and 5.7% (3.40ââ?¬â??3.60ââ?¬â?°GHz) for the upper band, while the 10-dB S11 bandwidths for the two bands are 8.1% (2.39ââ?¬â??2.59ââ?¬â?°GHz) and 6.9% (3.38ââ?¬â??3.62ââ?¬â?°GHz), respectively. The maximum gain at boresight for the lower band is 2.93ââ?¬â?°dBic at 2.5ââ?¬â?°GHz, while the gain for the upper band is 6.26ââ?¬â?°dBic at 3.52ââ?¬â?°GHz. The overall volume of the proposed antenna is 0.292Ã?»oââ?¬â?°Ã?â?? 0.292Ã?»oââ?¬â?°Ã?â?? 0.044Ã?»o, where Ã?»o is the corresponding free-space wavelength at 2.5ââ?¬â?°GHz....
A wideband antenna is designed based on...
From the actual perspective of working principle of localizer beacon subsystem of Instrument\nLanding System (ILS), consideration of the distance information from localizer antenna to field\nmonitor antenna and wide aperture effect of localizer antenna, broke through the limitation of\nsignals synthesized only far-field (FF), established the near-field (NF) model. The three-dimensional\nmathematical model of localizer beacon was designed, and the signals at both near-field and\nfar-field were analyzed qualitatively. At the environment of Antenna Fault as well as Antenna\nDistribution Unit (ADU) phase shifter simulation, the characteristics of near-field and far-field\nwere also compared. The simulation results showed that the model met the requirement of theory\nof localizer beacon, and the gap between two models was so evident, which resulted from the\nbroken geometric symmetry in NF area. The model could provide valuable theoretical basis for\nperformance evaluation and maintenance of the ILS, and meanwhile, provide reference for the\nfurther analysis of localizer beacon....
This paper discusses bandwidth enhancement for multiband microstrip patch antennas (MMPAs) using symmetrical rectangular/\nsquare slots etched on the patch and the substrate properties. The slot parameters on MMPA are modeled using soft computing\ntechnique of artificial neural networks (ANN). To achieve the best ANN performance, Particle Swarm Optimization (PSO) and\nDifferential Evolution (DE) are applied with ANN�s conventional training algorithm in optimization of the modeling performance.\nIn this study, the slot parameters are assumed as slot distance to the radiating patch edge, slot width, and length. Bandwidth\nenhancement is applied to a formerly designed MMPA fed by a microstrip transmission line attached to the center pin of 50 ohm\nSMA connecter. The simulated antennas are fabricated and measured. Measurement results are utilized for training the artificial\nintelligence models. The ANN provides 98% model accuracy for rectangular slots and 97% for square slots; however, ANFIS offer\n90% accuracy with lack of resonance frequency tracking....
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