13,151 research outputs found
A slot-loaded reduced-size CPW-fed aperture antenna for UWB applications
The paper presents a co-planar wave guide (CPW)-fed slot loaded low return loss planar printed antenna with a small size designed for wireless communication and UWB applications. First, a conventional UWB antenna is modeled to provide a reference point for the modeling and then the shape is modified by a self inverted configuration to achieve higher bandwidth and size reduction. To improve the gain and efficiency, a combination of corner features and loading slots are introduced. The primary aim throughout the modeling was to achieve the minimum possible value of return loss (S11) below -10 dB over the FCC-defined UWB frequency range. The antenna was designed, simulated and modified using Agilent's Advanced Design System (ADS). It was fabricated on FR4 substrate and measured return loss results are presented
Nuclear matter properties with nucleon-nucleon forces up to fifth order in the chiral expansion
The properties of nuclear matter are studied using state-of-the-art
nucleon-nucleon forces up to fifth order in chiral effective field theory. The
equations of state of symmetric nuclear matter and pure neutron matter are
calculated in the framework of the Brueckner-Hartree-Fock theory. We discuss in
detail the convergence pattern of the chiral expansion and the regulator
dependence of the calculated equations of state and provide an estimation of
the truncation uncertainty. For all employed values of the regulator, the
fifth-order chiral two-nucleon potential is found to generate nuclear
saturation properties similar to the available phenomenological high precision
potentials. We also extract the symmetry energy of nuclear matter, which is
shown to be quite robust with respect to the chiral order and the value of the
regulator.Comment: 10 pages, 3 figures, 3 table
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