Abstract-In the design of a conformal patch antenna array, a special care must be taken regarding the placement of elements and curvature bending. Presently, the authors try to explain the effect of these two factors on the key parameters such as return loss, mutual coupling, gain and directivity. Here, the analyses of parameters are done under the consideration of dielectric coated two-element antenna array model. This paper attempts to examine the characteristics of the dielectric coated conformal antenna array by varying its inter element spacing on the changing cylindrical geometry. The twoelement conformal array is considered in E-plane and H-plane configurations, and its parameters are analyzed using full wave analysis and verified by HFSS tool. A comparative study shows that the E-plane configuration gives better result than H-plane configuration.
In this manuscript, a novel photonic crystal resonator (PhCR) structure having an exponentially graded refractive index profile is proposed to regulate and alter the dispersion characteristics for the first time. The structure comprises silicon material, where porosity is deliberately introduced to modulate the refractive index profile locally. The structural parameters are optimized to have a resonant wavelength of 1550 nm. Further, the impact of various parameters like incidence angle, defect layer thickness, and analyte infiltration on device performance is evaluated. Finally, the sensing capability of the proposed structure is compared with the conventional step index-based devices. The proposed structure exhibits an average sensitivity of 54.16 nm/RIU and 500.12 nm/RIU for step index and exponentially graded index structures. This exhibits the generation of a lower energy resonating mode having 825% higher sensitivity than conventional resonator structures. Moreover, the graded index structures show a 45% higher field confinement than the conventional PhCR structure.
This paper primarily discusses the construction of different high speed adders using very high speed integrated circuit hardware design in the platform Modelsim 5.5c. The reason for this investigation is that adders are the most important circuits requiring improved designs in order to obtain maximum gain possible. In any digital system adders are the most fundamental unit. Addition is an indispensible operation in any Digital, Analog, or Control system. They are not only as arithmetic logic unit in computers and some processors but used in some other kind of processors too, where they are used to calculate addresses, table indices, and similar operations [6]. Today technology in measured by its ability to measure computational algorithms. This paper discusses the drawbacks and gains of ripple carry, carry look ahead, carry select and kogges stone in terms of area, speed, delay. This paper focuses on implementation and simulation of 64 bit full adder using very high speed integrated circuit hardware description language(VHDL).
Abstract-Conformability helps microstrip antenna to mount on any geometry platform and can also be used for multiple frequency systems without any complexity. The designing of a frequency reconfigurable antenna conformal to cylindrical surface using the combination of metamaterial (MTM) and substrate integrated waveguide (SIW) is proposed. The single and dual antenna models resonate at various frequencies of C-band by means of changing the cylindrical curvature. The results also show a considerable improvement in bandwidth and gain for dual antennas as compared to the single antenna. The antenna parameters are simulated on HFSS tool, and validation process is done by experimental setup.
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