a finite element analysis is presented for sloshing and impulsive motion of liquid-filled conical tanks during lateral anti-symmetric excitation. the performed analyses led to the development of a number of charts which can be used to identify the natural frequency, the mode shapes of conical tanks for both fundamental and the cos(θ)-modes of vibration. conical tank geometry was described with ...

In this paper, the buckling of non-homogeneous isotropic truncated conical shells under uniform lateral pressure and resting on a Winkler foundation is investigated. The basic relations and governing equations have been obtained for non-homogeneous truncated conical shells. The critical uniform lateral pressures of non-homogeneous isotropic truncated conical shells with or without a Winkler fou...

Antenna Miniaturization Using Fractals Richa Garg, AP ECE Deptt., [email protected], J.C.D.C.O.E., Sirsa ABSTRACTThe use of fractal geometry in designing antenna has been a resent topic of interest. Fractal shape has their own unique characteristics that the improved antenna performance can be achieved without degrading the antenna properties. Modern telecommunication system requires antenn...

in this paper a new uwb textile slot antenna has been designed with high precision. this work aimed to makecloser steps towards real wearability by investigating the possibilities of designing wearable uwb antenna wheretextile materials are used for the substrate as well as the conducting parts of the designed antenna. the antenna iscomposed of three textile layers: the top and bottom are condu...

In this paper, a new method for radar cross section reduction of a monopole antenna is proposed. In this method, a plasma helix like fluorescent bulbs is placed around the antenna element. The selected plasma parameter for this medium acts as an absorber without disturbing the antenna performance. The simulations show that radar cross section of simulated antenna is reduced in a wide frequency ...

in this article, the linear array (with 20 elements in the horizontal orientation) of microstrip antenna is examined with horizontal polarization. the set includes three microstrip substrates. there is a power network in two lower substrates and microstrip patches in the upper substrate. excitation of patches has been done as coupled through the power network in two lower substrates. using the ...

ABSTRACT Global 21-cm experiments aim to measure the sky-averaged H i absorption signal from cosmic dawn and epoch of reionization. However, antenna chromaticity coupling bright foregrounds can introduce distortions into observational data such experiments. We demonstrate a method for guiding design global experiment through analysis simulations. This is done by performing simulated observation...

The HI 21cm absorption line is masked by bright foregrounds and systematic distortions that arise due to the chromaticity of antenna used make observation coupling spectral inhomogeneity these foregrounds. We demonstrate are sufficient conceal signal when not perfectly achromatic simple corrections assuming a constant spatial distribution foreground power insufficient overcome them. then propos...

This dissertation focuses on designing, fabricating and testing antennas that are suitable for operation within the V/W bands. In particular, this work focuses on the design of slotted rectangular waveguide antenna arrays and cross slotted waveguide fed horn antennas. These structures are known for their high efficiency and high circularly polarized gain that can be implemented in satellite and...