In this paper, a radial line microstrip antenna array (RL-MSAA) for linear polarization is designed. Stacked microstrip antennas (MSAs) with a stub element in the upper parasitic element are arrayed on a radial waveguide as a phase-controllable radiation element. A prototype array with three concentric rows of the stacked MSAs is tested in 12 GHz.

In this paper, a wideband eight-element multiple-input multiple-output (MIMO) antenna array for 5G smartphone applications is presented. Each composed of dual-arm tortuous monopole radiating element with double-stub tuner and an open slot on the ground plane. Tuning stub microstrip lines are utilized to improve impedance matching. The operating bandwidth single from 3200 6000 MHz three resonant...

The paper provides an experimental comparison of four types of ultra-wideband coplanar-fed planar monopole antennas. Parameters of the open stub completed by an L-shaped monopole and the cross monopole were adopted from the literature. The forked monopole and the coplanar monopole were fabricated and measured. Monopoles were compared from the viewpoint of the impedance bandwidth, gain, directiv...

The concurrent action of the sucrase and isomaltase active sites of the hybrid sucrase-isomaltase from rat intestine on an a-limit dextrin was studied by use of 63 maltotriosylmaltotriose isolated from controlled action of pullulanase on pullulan. Hydrolysis of the a-dextrin hexasaccharide occurred by sequential removal of a glucose residue from its nonreducing end. The initial pentasaccharide ...

1. Introduction Leaky-wave antennas based on an open-waveguide structure can become a candidate of millimeter-wave antennas. Since such a structure is already open, leakage is produced by introducing not a physical cut, but asymmetry of the structure. As a result, it supports a leaky mode (instead of a bound mode) and therefore radiates all along its length, possess flexibility in beamwidth and...

Developer testing (also called unit testing) can help ensure the development of high-quality cloud applications. However, unit testing normally can’t take into account all possible inputs because the input space is too large or even infinite. So, developers need criteria to decide which test inputs to use and when to stop testing. Effective use of criteria such as structural-code coverage can h...

When the total current in CESR was raised to about 300 ma a longitudinal instability threshold occurred which prevents a signi cant increase in the current. Experiments on CESR indicate that the main cause for the longitudinal instability is the H.O.M. in the cavities [1]. It has also been shown that by changing the cavities temperature the longitudinal instability threshold can be slightly rai...

Real-world data networks are large, making them difficult to analyze. Thus, analysts often generate network models of a more tractable scale to perform simulations and analyses, but even these models need to be fairly large. Because these networks do not directly correspond to any particular network, it is often difficult for the user to construct a mental model of the network. We present a net...

A rich and very dynamic Content distribution ecosystem enables today’s Internet users to access content associated with major providers from a close-by front-end server. While the advantages of the resulting locality of traffic for users (i.e. better performance) and providers (i.e. lower cost) are well understood, two basic questions about the content distribution ecosystem remained unanswered...