Flexible substrates play a vital role in the design of wearable antennas. Analysis and fabrication rectangular microstrip patch antenna have been demonstrated this paper on least explored flexible PVC-based transparent sheet. The substrate’s dielectric constant loss tangent calculated by conducting standard ring resonator test. effect bending an with different diameters along x-axis y-axis has ...

For network intrusion and virus detection, ordinary methods detect malicious network traffic and viruses by examining packets, flow logs or content of memory for any signatures of the attack. This implies that if no signature is known/created in advance, attack detection will be problematical. Addressing unknown attacks detection, we develop in this paper a network traffic and spam analyzer usi...

This paper describes methods and tools for measuring the complex permittivity permeability of various materials in range 0.9 – 40 GHz. A list equipment necessary practical implementation experimental evaluation (ε, μ) materials, as well coefficients R reflection T transmission electromagnetic radiation through samples is proposed. In circuits, vector network analyzer PNA-X N5244 used. Six schem...

A method for directly comparing vector network analyzer (VNA) and time-domain spectrometer (TDS) measurements in free space using transmission-type frequency selective surfaces (FSSs) is proposed. The transmission characteristics of FSSs with artificially controlled dispersions facilitate flexible detailed comparisons VNA TDS measurements. Four were designed as verification devices proposed app...

Chromatic dispersion is an important fiber attribute affecting transmission performance over optical fibers. Various chromatic measurement methods have been developed primarily for single-mode In the literature, techniques were also to characterize few-mode fibers and multi-mode These are often subject some limitations. this paper, a simple robust method of fibers, polarization--maintaining pre...

The electric power calculator (EPC) software, for the simulation and analysis of electrical networks at industrial frequency, is described in this article, including its source code operational diagram. Compared to well-known commercial EPC directly provides values voltages, currents, powers each subsystem. voltages currents are calculated, phasor notation, applying Kirchhoff’s laws, while obta...