**RADIO FREQUENCY LINES OR LOW LOSS LINES**

A LOW LOSS TRANSMISSION LINE IS ONE FOR WHICH

R<<шl

AND G<<шC

Thus Z=R+jшL- jшL

And Y=G+jшC – jшC Continue reading “RADIO FREQUENCY LINES OR LOW LOSS LINES”

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# Category: Transmission Lines

## RADIO FREQUENCY LINES OR LOW LOSS LINES

## USE OF “WAVELENGTHS TOWARDS GENERATOR”(WTG) SCALE AND “WAVELENGTHS TOWARDS LOAD”(WTL) SCALE ON SMITH CHART

## Relation Voltage Standing Wave Ratio and Reflection Coefficient

## Standing wave and standing wave ratio

## IMPEDANCE MATCHING USING STUB

## Input impedance for quarter wave and half wave transmission line

## ULTRA HIGH FREQUENCY (U.H.F) TRANSMISSION LINES-1

## DISTORTIONLESS LINE

## LOSSLESS TRANSMISSION LINE AND ITS CONDITION

## TRANSMISSION LINE AND ITS TYPES

Science Articles for Winners

**RADIO FREQUENCY LINES OR LOW LOSS LINES**

A LOW LOSS TRANSMISSION LINE IS ONE FOR WHICH

R<<шl

AND G<<шC

Thus Z=R+jшL- jшL

And Y=G+jшC – jшC Continue reading “RADIO FREQUENCY LINES OR LOW LOSS LINES”

**Let us first discuss USE OF “WAVELENGTHS TOWARDS GENERATOR”(WTG) SCALE AND “WAVELENGTHS TOWARDS LOAD”(WTL) SCALE ON SMITH CHART**

The outermost scale around the perimeter of Smith chart is called the Wavelengths towards generator(WTG) scale.It has been constructed to denote movement on the transmission line toward the generator,in units of the wavelength,λ.Thus ,l is measured in wavelengths and one complete rotation corresponds to l=λ/2. Continue reading “USE OF “WAVELENGTHS TOWARDS GENERATOR”(WTG) SCALE AND “WAVELENGTHS TOWARDS LOAD”(WTL) SCALE ON SMITH CHART”

Last time I have discussed the standing wave ratio and voltage standing wave ratio. Today we will discuss the reflection coefficient and relation of voltage standing wave ratio with the reflection coefficient.

**REFLECTION COEFFICIENT**

**Definition:- **Reflection co-efficient is defined as the ratio of the reflected voltage to the incident voltage. Continue reading “Relation Voltage Standing Wave Ratio and Reflection Coefficient”

**In this article, we will understand; what is standing wave, standing wave ratio (SWR), voltage standing wave ratio (VSWR) and current standing wave ratio (CSWR) in context of transmission line.**

**STANDING WAVES**

When a transmission line is not correctly terminated ,the travelling wave at the receiving end is reflected completely or partially at the termination. The combination of incident and reflected waves give rise to standing waves of current and voltage along the line, with definite maxima and minima of current and voltage along transmission line. Continue reading “Standing wave and standing wave ratio”

**Let us discuss today discuss what is impedance matching and what is stub:**

**IMPEDANCE MATCHING**

A transmission line is matched when the load impedance ,Z_{r}is equal to the characteristic impedance ,Z_{0} of the line that is Continue reading “IMPEDANCE MATCHING USING STUB”

**Input impedance Z**_{i }for quarter wave transmission line

** **A transmission line is said to be quarter wave transmission line when its length equals quarter wavelength.

That is l=λ/4

Or l=(2n-1)λ/4 (odd multiple of λ/4)

Or βl=2π/λ * λ/4 [ β=2π/λ]

=π/2 Continue reading “Input impedance for quarter wave and half wave transmission line”

**ULTRA HIGH FREQUENCY (U.H.F) TRANSMISSION LINES (TRANSMISSION LINES AS CIRCUIT ELEMENTS)**

Ultra High Frequency lines commonly abbreviated as U.H.F lines are one of the types of the transmission lines. Ultra high frequency lines have operational frequency range from 300 to 3000 MHz or wavelength from 100 cm to 10 cm. Continue reading “ULTRA HIGH FREQUENCY (U.H.F) TRANSMISSION LINES-1”

**Definition DISTORTIONLESS LINE**

**A transmission line** is said to be distortionless when attenuation constant ‘α’ is frequency independent and the phase shift constant ‘β’ is linearly dependent on the frequency.

**Condition for line to be distortionless Continue reading “DISTORTIONLESS LINE”**

**CHARACTERISTIC IMPEDANCE ,Z _{0}**

**DEFINITION I:- ** Z_{0} is defined as the ratio of the square root of series impedance per unit length ,Z to the square root of shut admittance per unit length,Ỳ

Z_{0}=Z/Y =R+jωL/G+jωc Continue reading “LOSSLESS TRANSMISSION LINE AND ITS CONDITION”

**TRANSMISSION LINES**

Transmission lines are used to carry electromagnetic energy from one point to another . It means it transfer from one point to another. Generally it consists of two conductors. It is used to connect a source to a load. The source may be a transmitter or an electric generator and the load may be an antenna. Transmission lines are used for operational frequencies equal to or less than about 3GHz. Above 3GHz they will be replaced by waveguides. Continue reading “TRANSMISSION LINE AND ITS TYPES”