stub networks - ορισμός. Τι είναι το stub networks
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Τι (ποιος) είναι stub networks - ορισμός

SHORT ELECTRICAL TRANSMISSION LINE
Stub (circuit); Stub matching; Resonant stub; Radial stub; Butterfly stub; Bowtie stub
  • A microstrip filter using butterfly stubs
  • Resonant stub tank circuits in [[vacuum tube]] backpack UHF [[transceiver]], 1938. About 1/8 wavelength long: ''(left)'' 200 MHz stub is 19 cm, ''(right)'' 300 MHz stub is 12.5 cm
  • In a stripline circuit, a stub may be placed just before an output connector to compensate for minor mismatches due to the device's output load or the connector itself.

Stub network         
TYPE OF COMPUTER NETWORK
Stub Network
A stub network, or pocket network, is a somewhat casual term describing a computer network, or part of an internetwork, with no knowledge of other networks, that will typically send much or all of its non-local traffic out via a single path, with the network aware only of a default route to non-local destinations. As a practical analogy, think of an island which is connected to the rest of the world through a bridge and no other path is available either through air or sea.
stub network         
TYPE OF COMPUTER NETWORK
Stub Network
A network which only carries packets to and from local hosts. Even if it has paths to more than one other network, it does not carry traffic for other networks. See also backbone, transit network.
Method stub         
TERM IN PROGRAMMING
Stub (computer science); Code stub; Executable stub; Conventional memory stub; DOS memory stub
A method stub or simply stub in software development is a piece of code used to stand in for some other programming functionality. A stub may simulate the behavior of existing code (such as a procedure on a remote machine; such methods are often called mocks) or be a temporary substitute for yet-to-be-developed code.

Βικιπαίδεια

Stub (electronics)

In microwave and radio-frequency engineering, a stub or resonant stub is a length of transmission line or waveguide that is connected at one end only. The free end of the stub is either left open-circuit, or short-circuited (as is always the case for waveguides). Neglecting transmission line losses, the input impedance of the stub is purely reactive; either capacitive or inductive, depending on the electrical length of the stub, and on whether it is open or short circuit. Stubs may thus function as capacitors, inductors and resonant circuits at radio frequencies.

The behaviour of stubs is due to standing waves along their length. Their reactive properties are determined by their physical length in relation to the wavelength of the radio waves. Therefore, stubs are most commonly used in UHF or microwave circuits in which the wavelengths are short enough that the stub is conveniently small. They are often used to replace discrete capacitors and inductors, because at UHF and microwave frequencies lumped components perform poorly due to parasitic reactance. Stubs are commonly used in antenna impedance matching circuits, frequency selective filters, and resonant circuits for UHF electronic oscillators and RF amplifiers.

Stubs can be constructed with any type of transmission line: parallel conductor line (where they are called Lecher lines), coaxial cable, stripline, waveguide, and dielectric waveguide. Stub circuits can be designed using a Smith chart, a graphical tool which can determine what length line to use to obtain a desired reactance.