|
Transposed Excitation
In electrical engineering, transposed excitation of a dipole array means that adjacent dipoles in the array are excited in opposite directions. Dipole arrays with transposed excitation are used as antennas; they are closely related to self-complementary antenna The self-complementary antenna (SCA) is a basic antenna for extremely broadband practical antennas.D. E. Isbell, "Log-periodic dipole arrays" ''IRE Trans. Antennas Propag.'', vol. AP-8, pp.260-267, May 1960.Y. Mushiake, Log-periodic structure pr .... References Antennas {{Engineering-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Engineering
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use. Electrical engineering is now divided into a wide range of different fields, including computer engineering, systems engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, photovoltaic cells, electronics, and optics and photonics. Many of these disciplines overlap with other engineering branches, spanning a huge number of specializations including hardware engineering, power electronics, electromagnetics and waves, microwave engineering, nanotechnology, electrochemistry, renewable energies, mechatronics/control, and electrical m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dipole
In physics, a dipole () is an electromagnetic phenomenon which occurs in two ways: *An electric dipole deals with the separation of the positive and negative electric charges found in any electromagnetic system. A simple example of this system is a pair of charges of equal magnitude but opposite sign separated by some typically small distance. (A permanent electric dipole is called an electret.) *A magnetic dipole is the closed circulation of an electric current system. A simple example is a single loop of wire with constant current through it. A bar magnet is an example of a magnet with a permanent magnetic dipole moment. Dipoles, whether electric or magnetic, can be characterized by their dipole moment, a vector quantity. For the simple electric dipole, the electric dipole moment points from the negative charge towards the positive charge, and has a magnitude equal to the strength of each charge times the separation between the charges. (To be precise: for the definition of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antenna (radio)
In radio engineering, an antenna or aerial is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic wave In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, which propagate through space and carry momentum and electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visib ...s (radio waves). In Receiver (radio), reception, an antenna intercepts some of the power of a radio wave in order to produce an electric current at its terminals, that is applied to a receiver to be Amplifier, amplified. Antennas are essential components of all radio equipment. An antenna is an array of conductor (material), conductors (Driven element, elements), elect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self-complementary Antenna
The self-complementary antenna (SCA) is a basic antenna for extremely broadband practical antennas.D. E. Isbell, "Log-periodic dipole arrays" ''IRE Trans. Antennas Propag.'', vol. AP-8, pp.260-267, May 1960.Y. Mushiake, Log-periodic structure provides no broad-band property for antennas. ''J. IECE Japan'', 82, No 5, pp. 510-511, May 1999. (in Japanese) This antennaS. Uda, and Y. Mushiake, "The input impedances of slit antennas," ''Tech. Rep. of Tohoku Univ.'', 14, 1, September 1949. pp. 46-59. is an arbitrarily shaped antenna which is constituted with a half of an infinitely extended planar-sheet conductor such that the shape of its complementary structure is exactly identical, or "self-complementary" with that of the original structure with two terminals for the simplest case. The self-complementary antenna has constant input impedanceY. Mushiake, "The input impedances of slit antennas," ''J. IEE Japan'', 69, 3, March 1949. pp. 87-88. (in Japanese) independent of the source freq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
