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Physical Bounds for Antennas Above a Ground Plane

Physical limitations of antennas above infinite perfect electric conductor (PEC) ground planes are determined using the stored electromagnetic energy. Stored energies are computed with the method of moments (MoM) and the image theory. Convex optimization is used to derive the G/Q ratio and Q-factor for a reference geometry and the results are compared for different antenna types.

Calculation of antenna radiation center using angular momentum

An algorithm to compute the Radiation Center of an antenna based on the Spherical Wave Expansion is introduced. The method is based on the angular momentum vector that is uniquely defined for any antenna far field pattern. The radiation center is defined as the phase reference point where the angular momentum is minimized and corresponds to minimizing the phase variations in the antenna far field

In and Out of Focus: The Cultural Dynamics of Mediation and Landscape

There are interesting links between older viewing aids like the 1800th Century Claude Glass and recent photographic consumer products like the iPhone application Instagram and the spread of HDR (High Dynamic Range) photography. I will examine these links by juxtaposing them to some issues raised by landscape- and environmental art, as well as theoretical discussions of mediation and landscape. The

Information Sharing in the Supply Chain: An Exploratory Study

Purpose The purpose is to explore if a potential gap exists between information sharing as recommended in academic literature and the information actually shared among companies and their supply chain partners. Design/methodology/approach The paper is based on an extensive literature review to structure the terminology for information sharing in supply chains and an in-depth interview study to ex