The demand for large antennas in future space missions has increasingly stimulated the development of deployable membrane antenna structures owing to their light weight and small stowage volume. However, there is little literature providing a comprehensive review and comparison of different membrane antenna structures. Space-borne membrane antenna structures are mainly classified as either para...

detection of stealth targets calls for employment of high-power radars which itself relies on usage of high-gain antennas like large parabolic reflectors. in the past few years, using of an array with many small reflectors instead of a large reflector antenna has been considered. this method provides enhanced eirp by a factor of n2 where n is the number of array antennas. regarding improvement ...

A modified Schwarz-Christoffel transformation (SCT) is used to obtain guidedand radiated-wave characteristics of a singlycurved rectangular patch antenna. The method is to map a straight channel into an arbitrarily-curved channel. This simplifies the problem to that of a planar rectangular patch antenna. Applying conventional SCT to the problem confronts two difficulties: the region under inves...

This article proposes an approach to increase the efficiency of the U-shaped cross section antenna. The Optimization of a wideband U-shaped cross section antenna on a U-shaped ground plane is presented suitable for WLAN in various applications. The proposed antenna has been developed from a single element of U-shaped cross-sectional antenna. A single element is easy to be composed for installin...

and Applied Analysis 3 2.1. Functional Spaces The appropriate Sobolev space for 1.1 is H 0 Ω , defined as a completion of C ∞ 0 Ω with respect to the norm

Large deviation estimates for the following linear parabolic equation are studied: ∂u ∂t = Tr (

We determine the order dimension of the strong Bruhat order on finite Coxeter groups of types A, B and H. The order dimension is determined using a generalization of a theorem of Dilworth: dim(P ) = width(Irr(P )), whenever P satisfies a simple order-theoretic condition called here the dissective property (or “clivage” in [16, 21]). The result for dissective posets follows from an upper bound a...

In this article we present an efficient time lagging interface prediction method with implicit correction (TLIC) for the solution of multi dimensional parabolic problem defined over non overlapping subdomains. The time lagging method have been implemented with different integral multiples spatial spacing displacements from the interface line(s). We considered the additive splitting up method wi...

First, we prove a necessary and sufficient condition for global in time existence of all solutions of an ordinary differential equation (ODE). It is a condition of one-sided estimate type that is formulated in terms of so-called proper functions on extended phase space. A generalization of this idea to stochastic differential equations (SDE) and parabolic equations (PE) allows us to prove simil...