What is meant by stub matching?

[′stəb ‚mach·iŋ] (electromagnetism) Use of a stub to match a transmission line to an antenna or load; matching depends on the spacing between the two wires of the stub, the position of the shorting bar, and the point at which the transmission line is connected to the stub.

Why is stub matching needed?

In a strip line circuit, a stub may be placed just before an output connector to compensate for small mismatches due to the device’s output load or the connector itself. Stubs can be used to match a load impedance to the transmission line characteristic impedance.

What is a stub filter?

A stub filter is the most simple filter you can imagine. It consists of, at least one, piece of coax cable of certain length. The length of the cable is related to the resonance frequency ant thereby also the frequency of the notch.

What is the application of stub?

Stubs are commonly used in antenna impedance matching circuits, frequency selective filters, and resonant circuits for UHF electronic oscillators and RF amplifiers.

What are stubs in agriculture?

1. stub – a short piece remaining on a trunk or stem where a branch is lost. plant part, plant structure – any part of a plant or fungus. 2.

What is a stub discuss its use in transmission line?

A stub is a short-circuited section of a transmission line connected in parallel to the main transmission line. A stub of appropriate length is placed at some distance from the load such that the impedance seen beyond the stub is equal to the characteristic impedance.

How does a stub tuner work?

Stub tuners work as impedance transformers to introduce a variable shunt susceptance into a coaxial transmission line. They consist of one or more short-circuited, variable length lines (stubs) connected at right angles to the primary transmission line.

What is stub why short circuited stub is preferred?

Impedance matching by single-stub Short-circuited stubs are usually used in preference to open-circuited stubs because an infinite terminating impedance is more difficult to realize than a zero terminating impedance for reasons of radiation from an open end and coupling effects with neighboring objects.

What is stub cable?

[′stəb ¦kā·bəl] (electricity) Short branch off a principal cable; the end is often sealed until it is used at a later date; pairs in the stub are referred to as stubbed-out pairs.

What are stubs used for during development?

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.