This paper presents an element of a 2×2-element array antenna for Inmarsat BGAN/GPS applications. The element is an axial mode printed quadrifilar helical antenna that has been integrated with a compact feed network to provide sequential phase rotation for circular polarization (CP) radiation. The novel integrated lumped-element feed network is designed to provide a balanced RF power to the fou...

Periodic piezoelectric beams have been used for broadband vibration energy harvesting in recent years. In this paper, a periodic folded piezoelectric beam (PFPB) is introduced. The PFPB has special features that distinguish it from other periodic piezoelectric beams. The Adomian decomposition method (ADM) is used to calculate the first two band gaps andtwelve natural frequencies of the PF...

A complete procedure for the design of W-band low noise amplifier in MMIC technology is presented. The design is based on a simultaneously power and noise matched technique. For implementing the method, scalable bilateral transistor model parameters should be first extracted. The model is also used for transmission line utilized in the amplifier circuit. In the presented method, input/output ma...

The low transmission power and very large bandwidth used by Ultra-Wide band (UWB) radio systems ,enables them co-exist with other narrow-band systems over the same frequency band without interfering the narrow-band systems. Nevertheless, the interference caused by these narrow-band systems may jam the UWB receiver. Existing narrow-band interference suppression methods for spread spectrum system...

This paper presents a method for classification of Mammographic Microcalcifications using Quadmture Mirror Filter (QMF) bank subband decomposition as a tool for extracting textuml features. The QMF bank splits the input image into four subbands: low-low band, low-high band, high-low band and high-high band, and textural features baaed on eo-occurrence matrices are computed from the subsampled s...

This paper presents the design, simulation, and measurement of two low-cost broadband circularly polarized (CP) printed antennas: a single element and an array at C band. The proposed single element antenna is excited by an L-shaped strip with a tapered end, located along the circular-slot diagonal line in the back plane. From the array experimental results, the 3 dB axial ratio bandwidth can r...

We say that a family of graphs G = {Gn : n ≥ 1} is p-quasi-random, 0 < p < 1, if it shares typical properties of the random graph G(n, p); for a definition, see below. We denote by Q(p) the class of all graphs H for which e(Gn) ≥ (1 + o(1))p ( n 2 ) and the number of not necessarily induced labeled copies of H in Gn is at most (1 + o(1))pn imply that G is p-quasi-random. In this note, we show t...