Quick Answer: How Do You Reduce VSWR?

What is VSWR and return loss?

The VSWR is a measure of the standing waves set up in a feeder as a result of a mismatch, whereas the return loss looks at the amount of power absorbed by a load when power from a source is sent to it.

The return loss being the difference between the incident power and the reflected..

How does antenna reduce return loss?

By this research work, the return loss reduction can be achieved using double U – slot stacked patch technique using FR4 epoxy material in microstrip patch antenna which is fed by coaxial probe. the best return loss i.e. RL = -49.16 dB at resonate frequency Fr = 3.53dB is achieved by this design technique.

Is high return loss Good?

Return loss is a measure of how well devices or lines are matched. A match is good if the return loss is high. A high return loss is desirable and results in a lower insertion loss. Return loss is used in modern practice in preference to SWR because it has better resolution for small values of reflected wave.

How is antenna VSWR calculated?

Basic VSWR calculations and formulas The VSWR definition states that the VSWR is equal to the maximum voltage on the line divided by the minimum voltage. The voltage fluctuations come about as a result of the voltage components from the forward power and the reflected power summing together.

Why VSWR is measured?

VSWR (Voltage Standing Wave Ratio), is a measure of how efficiently radio-frequency power is transmitted from a power source, through a transmission line, into a load (for example, from a power amplifier through a transmission line, to an antenna). … VSWR measures these voltage variances.

Why is VSWR important?

The VSWR is always a real and positive number for antennas. The smaller the VSWR is, the better the antenna is matched to the transmission line and the more power is delivered to the antenna. The minimum VSWR is 1.0. In this case, no power is reflected from the antenna, which is ideal.

How VSWR could potentially damage the system?

It is a measure of how much energy is reflected back into the system. If the VSWR is too high, there could potentially be too much energy reflected back into a power amplifier, causing damage to the internal circuitry. … As the VSWR increases, the reflected power back into the system increases.

What causes high VSWR?

Any change in impedance causes a partial radio signal reflection. Connectors, particularly when improperly installed, loose or corroded. The term Voltage Standing Wave Ratio (VSWR) comes from how radio waves are distributed along a transmission line.

What is VSWR formula?

A ratio of 1:1 occurs when the load is perfectly matched to the transmission-line characteristic impedance. VSWR is defined from the standing wave that arises on the transmission line itself by: VSWR = |VMAX|/|VMIN| (Eq.

What is a good VSWR reading?

What is a good SWR reading ? The best reading possible is 1.01:1 (46dB return loss), but usually a reading below 1.5:1 is acceptable. Outside the perfect world a 1.2:1 (20.8dB return loss) is spot on in most cases. To ensure an accurate reading, it is best to connect the meter at the base of the antenna.

What is a good VSWR value?

The range of values for VSWR is from 1 to ∞ . A VSWR value under 2 is considered suitable for most antenna applications. The antenna can be described as having a “Good Match”. So when someone says that the antenna is poorly matched, very often it means that the VSWR value exceeds 2 for a frequency of interest.

What causes return loss?

There are two major causes of RL in a network: discontinuities and impedance mismatches. Discontinuities occur at connections where cable is terminated to plugs or jacks and within the plug/jack connection itself. A discontinuity can also occur if a cable is bent too much, kinked or otherwise damaged.