lossless antenna

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• Antenna gain — is defined as the ratio of the radiation intensity of an antenna in a given direction, to the intensity of the same antenna as it radiates in all directions (isotropically). Since the radiation intensity of an isotropically radiated power is… …   Wikipedia

• Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… …   Wikipedia

• Directivity — Diagram showing directivity In electromagnetics, directivity is a figure of merit for an antenna. It measures the power density the antenna radiates in the direction of its strongest emission, versus the power density radiated by an ideal… …   Wikipedia

• Power dividers and directional couplers — A 10 dB 1.7–2.2 GHz directional coupler. From left to right: input, coupled, isolated (terminated with a load), and transmitted port …   Wikipedia

• Mars Exploration Rover — Artist s conception of rover on Mars Part of a panorama taken by the Spi …   Wikipedia

• Reciprocity (electromagnetism) — This page is about reciprocity theorems in classical electromagnetism. See also Reciprocity (mathematics) for unrelated reciprocity theorems, and Reciprocity for more general usages of the term. In classical electromagnetism, reciprocity refers… …   Wikipedia

• Superlens — A superlens, super lens or perfect lens is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is an inherent limitation in conventional optical devices or lenses.[1] In 2000, a type of lens was proposed,… …   Wikipedia

• Transmission line — This article is about the radio frequency transmission line. For the power transmission line, see electric power transmission. In communications and electronic engineering, a transmission line is a specialized cable designed to carry alternating… …   Wikipedia

• Ground plane — In electrical engineering, a ground plane is an electrically conductive surface. Radio antenna theory In telecommunication, a ground plane structure or relationship exists between the antenna and another object, where the only structure of the… …   Wikipedia

• Dummy load — Cantenna dummy load suitable up to 30 MHz and up to 1 kW A dummy load is a device used to simulate an electrical load, usually for testing purposes. Contents 1 Radio …   Wikipedia

• Downlink CNR — (Carrier to noise ratio in satellite reception) is an important figure in system TVRO design. Below are certain parameters used in CNR computation. Contents 1 Figure of merit 2 Path loss 3 EIRP 4 Baseband …   Wikipedia