It also indicates the in of forward to reflected power. 891: 6. A good VSWR to aim for is at least 1. Our RF and microwave calculators and converters will provide the figures you need for your radio frequency engineering needs. A network analyzer can be used to make S parameter measurements. Just enter the value and click calculate. Solution: First the VSWR figures are converted to reflection coefficient magnitudes: Then the mismatch uncertainty is: M u = ±200 (0. In an RF system, when power is sent from the source to load, there are three main parameters to be considered: (1) incident power. 4. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. VSWR, or the Voltage Standing Wave Ratio, is the ratio of the maximum. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1] Return Loss on Wikipedia Conversion Tables. 64% or ±10 x log10 (103. Formula. 2 to 12. Enter a value for VSWR (remember: VSWR should be a number larger than 1. It is expressed in dB. Reflection Coefficient. reflection coefficient definition. VSWR to Return Loss Conversion Table. Forward Power (dBm)Return loss tells you how much of the input signal is reflected. Γ = Reflection coefficient. dB Path Loss with respect to dipole or isotropic antenna: Watts: dBw or dBm: microVolts: dBm: pforward (Watts) pref (Watts) Return Loss or a VSWR: return loss (dB) (evaluated as neg. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. e. 1 Return Loss. It is specified in dB. 1, for system 2 is 0. Subscribe to receive Mini-Circuits News. here is an online cascaded VSWR calculator using the RSS method. VSWR table of return loss vs. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1]. As an added bonus, the results are modifiable and can calculate the other values. VSWR to Return loss calculator. 0 15. 8. If the power incident on a load is Pi P i and the power reflected by the load is Pr P r, then the return loss in decibels is [1, 2] RLdB = 10 log Pi Pr (7. VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). Visit Return Loss to VSWR converter>> RF Calculator #5 :Understanding VSWR and Insertion Loss Plots; Understanding Crosstalk and Isolation Plots; 40-870 And 40-830 Series RF Architectures; Calibrating RF Modules with Souriau Connector; Solid State RF Switching to 6GHz; RF Level Conversion; VSWR Interaction; VSWR to Return Loss; Power Loss Due to VSWR of Series SwitchesB at a level of -32 dBm. The two VSWRs produce a combined return loss, as follows: The uncertainty in the total measurement stemming from the source and load VSWRs is Uncertainty (+)=20log 10 (1+ γ 1 ·γ 2 ) dB, and Uncertainty (–)=20log 10 (1–γ 1 ·γ 2 ) dB. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). 458:1 in VSWR equals 14. The return loss vs. Reflection. 891: 6. To use this calculator, enter one of the following data: the voltage standing waves ratio VSWR, the return loss RL, the reflection coefficient ρ, the power ratio ρ 2, the forward and reflected power P fwd and P ref; or the impedances Z c and Z l. This is the amount of power that is lost due to impedance mismatch, and. RF insertion loss is the reduction in signal power as it passes through an RF component or system. VSWR and Return Loss Calculations. Please enter your values below. 0 5. 794 VSWR to Return Loss (dB) Converter; Return Loss (dB) to VSWR Converter; Power Conversion : dBm - volts - watts; Phase Noise to Phase Jitter Converter; Phase Jitter to Phase Noise Converter; ppm to Hz Converter; misc. It also shows the percentage of forward to reflected power. Note: impedance is a complex quantity, it has real and imaginary parts or magnitude and phase; instruments are almost always calibrated for Zo being some nominal real value, is Xo=0 (eg when people speak of a 50Ω instrument, that means 50+j0Ω even if they don't. 5115. 01:1 to 3. This is an online calculator that calculates VSWR located on Return Loss. Please check for yourself using appropriate formula. In some systems this is not a trivial amount and points to the need for components with low VSWR. Calculation Select input type: Result: VSWR (pronounced "viswar"), or the Voltage Standing Wave Ratio, is the ratio of the maximum standing wave amplitude at one node to the. A power sensor with a return loss of –23 dB is connected to a calibration source with a return loss of –20 dB. Reflected power ratio for system 1 is 0. It measures how much energy is reflected back to the transmitter when a signal is transmitted through an antenna. If VSWR is known, then the reflection coefficient (Γ), return loss (RL),. 3. Return Loss in decibels (RLdb): Definition: Return loss is the ratio between Forward and Reflected Power in decibels. A01TKL_ RF Inductor by Coilcraft →. However, each field, when changed will allow. Return loss = -20 * log(Γ) For example, if the VSWR value is 3 : 1, we will first have to find the reflection coefficient's value using it, Γ = 0. But it is more complicated. 6 Adding VSWR to the MixT Attenuator Calculator. The return loss at that point has degraded by approximately 5 dB. Return Loss Vs. 58 dB in return loss. These parameters are often applied to antennas, RF filters and RF amplifiers such as LNA s and PA s. Here Click here to learn more about VSWR. Here is the problem. ← Conducted RF Environments With Real RF Devices Vs. N = current stage. As we know that the reflection coefficient defines the amount of the electromagnetic wave is reflected due to the impedance discontinuity in a transmission path. One is tempted to seek the maximum value and make a “pass / fail” decision based on this value. For example, an efficiency of 0. S11 then would be the reflected power radio 1 is trying to deliver to antenna 1. This calculator allows you to calculate the input impedance of a transmission line, as well as the VSWR, return loss, and mismatch loss at the input point. 00Watts Enter 1. This test determines the return loss value of each connector pair, cable component and cable to identify the problem location. A calculator designed to compute the VSWR,return loss and matching loss in a transmission line. Γ = (VSWR – 1)/(VSWR + 1) Return Loss (dB) = -20*Log 10 (|Γ|) Mismatch Loss (dB) = -10*Log 10 (1 – |Γ| 2) That said, there are also passive non-reciprocal devices such as isolators, circulators (and gyrators). function doValidate_3 form { window[ cff_enabling_form ] = functi. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. Consider the antenna being used in transmit mode. Return Loss (dB) VSWR. Calculate the VSWR and Reflection Coeffecient on the parameters you enter using Elite RF's Calculator. " –. Since the signal velocity through the network is a known constant, like the sound velocity in our analogy above, the time it takes for the reflections or echoes to return can be converted to distance. In this context, the term S-parameters or. Now, let us investigate the physical meaning of return loss. The first one is a VSWR-to-Return Loss converter, where I input a number that every RF engineer and technician should have memorized for easy reference: 1. An online calculator for converting between VSWR and Return Loss, Reflection Coefficient, Mismatch Loss, and Reflected Power. Coupling to Direct Line Insertion Loss Conversion Table for Directional Couplers. Just by entering the VSWR the return loss can be obtained using this calculator. 4. Just enter the value of source return loss, input return loss, output return loss, load return loss, device gain, and isolation then the calculator will compute the minimum and maximum gain. , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. But, for a practical system, there will be a small impedance. A table of convenient values are presented at the bottom. Archive Documentation Data Software. com Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. 8. Radio Frequency Engineering Calculator. If you don't want to go through complicated equations to understand the relationship between VSWR, mismatch loss, s11/gamma and would like a calculator to do it for you, check out our VSWR. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). Just enter the value and click calculate. Formula is:: reflection coefficient (Γ)=. ElectronicsForU. Impedance Matching Pi Attenuator Calculator. . Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. As an example, if the return loss of the amplifier is 4 dB, use the calculator below. 51 dB, and a return loss of 9. Return loss quantifies the amount of reflected power, while insertion loss quantifies the loss of power as it passes through the component or device. 1) (7. Calculate. Assuming that the source and load are perfect then when the signal from the source arrives at the switch some of that signal is reflected. VSWR table of return loss vs. Then click the "Calculate" button next to the value you just typed to compute the others. All of the power is reflected back. Return Loss to VSWR. This has an online calculator that calculates VSWR based on Return Loss. These multiple solutions are possible because each contributor is a vector having both. When you look at a graph of a return loss formula, the negative sign is often omitted and is sometimes used interchangeably with the S11 parameter. The table shows the effects of combining two components in terms of their maximum VSWR and return loss. Therefore, a VSWR of less than 1. Return Loss is the amount of power that is lost in the signal returned/reflected by a discontinuity in a transmission line. Now, assume a "more perfect" termination of 51 ohms was used. everything RF has the largest selection of online calculators for the RF and Microwave Industry. Step 1. Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. Return Loss has surfaced in our ham world due to the new handheld antenna system analyzers like the Nano VNA and others. Requires Windows 7 (64 Bit) or higher. Our results are optimised for gain, but others may be optimised for bandwidth. Convert Forward and Reflected Power to Reflected Power percentage : P%REF = PREF / PFWD x 100. Just enter the range and click calculate. For a VSWR of around 5. See the relationship between VSWR and return loss. 8 is 80%, or -0. This site comprises a comprehensive array of tutorials and related tools, including explanations, examples, references and charting. 3% of the power back towards the transmitter. dB (S 21) SWR = to 1: Insertion Loss = dB (S 21) Return Loss = dB (S 11) Return Loss = dB (S 11) NOTE: NOTE: Introduction to scattering parameters (S 11 and S 21): SWR is always greater than 1 to 1. VSWR is a measure of the reflected power on a transmission line. If you provide an email address I can share a system. In turn, reflection co-efficient is related to Return loss (RL) by the following formula: Once you have computed the Return loss, RL, VSWR can be arrived at by using the following formula: Typical values for Γ, RL, and VSWR are given below: Note: The above values are approximate only. This calculator converts values between VSWR, Return loss, Reflection Coefficient and Mis-Match Loss. everything RF has the largest selection of buy calculators for the RF and Stove Industry. ,100 % power transferred from a source to a load via a transmission line/cable). The VNAs with math modes can also directly calculate and display the resulting VSWR value. VSWR. Any other value indicates that a portion of the energy is reflected. Due to mismatches in impedance within the connector, some of the signal is reflected. VSWR (Voltage Standing Wave Ratio) is a measurement of how well matched a radio transmitter and transmission line is to a load. 9, for system 2 is 0. Return loss and mismatch loss Calculator Return Loss and Mismatch Loss Calculator Calculates the absolute load impedance, reflection coefficient, VSWR, return. In summary, return loss is the loss of signal power due to signal reflection or return by a discontinuity in a fiber-optic link or transmission line. Generally, both retur n loss and structura l return loss of a simple channel are calculated usin g equations that rely on characteri stic impedance and the impedance of the termination only [ 1]. The VSWR calculator helps in finding the reflection coefficient, return loss, and mismatch loss from the VSWR value. This makes it a more direct measure of reflections than VSWR. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. VSWR = Voltage standing wave ratio. LM = Matching loss in decibels Example . It including shows one percentage from forward to reflected power. As a result, you have a range of either plus or minus uncertainty. Mismatch loss is the ratio of power delivered to power available, and is a simple function of reflection coefficient. As it can be seen from the above equation, VSWR is always a real and positive number with a minimum value of 1. This can be built into a FLEXI-BOX and a transmission line (50 Ohm track) PCB is available which easily adapts for this circuit with one simple trimming. An antenna’s Return Loss is a figure that indicates the proportion of radio waves arriving at the antenna input that are rejected as a ratio against those that are accepted. everything RF has the big selection of get calculators for the RF and Microwave Industry. This is an online calculator this calculates VSWR based to Return Loss. 02 VSWR (i. 2. VSWR is a measure of the reflected power on a transmission line. e. Thus with ~ 25% reflected power: Return Loss = -10 x Log [ 100/25. Conversion Formulas. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . Qorvo Interactive Tools & Calculators. This is an ideal open or short circuit, equivalent to VSWR=infinite. 002 respectively as shown in table-6 for the notch width, g=1. Reflection Coef. e. A high return loss is desirable and results in a lower insertion loss . We did not sweep outside the rated bandwidth of the waveguide. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. 54dB. g. The calculator is designed to be fine tuned after the initial input. This is an online computers that calculates VSWR based on Return Loss. The Return Loss on the other hand deals usually with the voltages and is used in the VSWR measurements, either manually or through the instrumentation. Just enter the value and click calculate. The MAX2016 outputs the difference between the two power detectors. Return Loss to VSWR. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. Just enter the value and click calculate. Reflection -3dB: half of the RF energy is being reflected, and thus half of the energy is being received by the device. 0:1). If the power incident on a load is Pi P i and the power reflected by the load is Pr P r, then the return loss in decibels is [6, 7] RLdB = 10 log Pi Pr (2. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. In the above. 6dB. microwaves101. P%REF = (VSWR - 1)² / (VSWR + 1)² x 100. R = 20log 10 (E incident /E reflected)This can an online calculator that estimates VSWR based on Return Loss. VSWR to Return loss calculator. VSWR and Return Loss RF Calculator. 00Watts = 1. 57. everything RF has an largest selection of wired calculators for. VSWR. 16-Feb-2022. As an added bonus, the results are modifiable and can calculate the other values. VSWR (Voltage Standing Wave Ratio) is the measure of how efficiently RF power is transmitted and is expressed as a ratio of the maximum to minimum. Equitable enter the value and click calculate. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. 1) VSWR Calculation. As an added bonus, the results are modifiable and can calculate the other values. The VSWR monitoring system consists of an ADC for real-time measurements. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. Refl Coeff Power TransCalculate VSWR, Return Loss, Reflection Coefficient, Match Efficiency, and Net Transmission Loss from an RF broadcast transmitters forward and reflected power readings. They are related but measure different aspects of signal performance. Just enter one value and snap calculate. Pi Attenuator Calculator. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. The directivity would be limited to the corresponding return loss, 14 dB. 0. Forward Power (W) Reverse Power (W) VSWR. There are a number of points to. total RF has the largest selection of online calculators for the RF and Micro Industry. 01. I have already calculated the cascaded VSWR and RL using the RSS method (very similar result to simply multiplying each components VSWR as Itay mentioned), but the problem is that the result is not even close to the measured value of return loss. This ratio can also be measured in dB, and expressed as Return Loss. Just entered the value or click calculation. If the antenna reflects 250 watts the VSWR at the antenna will be 1. 30 MB. This is an online calculator that calculates Return Loss based on VSWR. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch lost. RF Trap With Attenuators Computes attenuation, return loss, reflection coefficient and VSWR . The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of. Calculate the uncertainty in gain of an amplifier due to the mismatch in impedance. 98dB = 96. The power reflected back from an antenna is specified using either the voltage standing wave ratio (VSWR) or the reflection coefficient (also referred to as return loss). This can be built into a FLEXI-BOX and a transmission line PCB is available which easily adapts for this circuit with one simple trimming operation. 695. Measured return loss vs. Installer for the Windows version of dB Calculator. This is an online calculator that calculates VSWR based on Get Loss. 1) Enter the required input and output impedance and the required attenuation then press "Calculate" below to obtain the Ideal. But, for a practical system, there will be a small impedance. This is known as mismatch loss. VSWR to Return Loss Calculator. The formula for insertion loss in decibels (dB) is: Insertion Loss (dB) = 10 * log10 (Pin / Pout) Where: Pin is the input power or signal level. Return loss vs. com +1 (718) 934 4500 +1 (800) 654 7949. Calculate Reset . Input Value: Calculate Reset Definition of VSWR "Understanding VSWR isn't just about crunching numbers; it's about shaping the future of efficient wireless communication. 5:1 is considered ideal in the RF field, and. If problems show up during this test, there is a very good. s. A table of convenient values are presented at the bottom. (5. It’s typically expressed in decibels (dB) and calculated as the input power minus the output power. Return loss vs. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. Take a look at the Return Loss chart below for one of our dual band Wi-Fi antennas which performs really well around the 2. When we refer to return loss and transmission loss on Microwaves101, we use these equations: Return loss = -20 x log [mag ()] Transmission loss = -20 x log [mag ()] This effectively means that for passive devices, return loss expressed in dB is a positive number, because the reflection coefficient is less than unity. 011. It may be used to calculate and plot the return loss, standing wave ratio from Smith charts, Real power Vs Frequency, VSWR, E-field and H-field distribution, gain as well as radiation patterns. Just enter the value and click calculate. 000:There are many antenna parameters out there. everything RF has an largest selection of wired calculators for the RF and Microwave Industry. Reflection Coefficient to Impedance Converter Convert a reflection coefficient in Magnitude Angle format into Impedance and vice versa. Return Loss (dB) = ‐20 log [(VSWR‐1)/(VSWR+1)] VSWR = [1+10 (‐Return loss/20)]/[1‐10 (‐Return loss/20)] 215 Vineyard Court, Morgan Hill, CA 95037 | Ph: 408. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). 0. Click Here To Download Product Brochure. This calculator is specific to the circuit used in the RF Trap With Attenuators FLEXI-BOX. We can then find the return loss as -20 * log(0. Just entry the appreciate and click calculate. The VSWR is a measure of the efficiency of a transmission line and is used to determine how well the line is matched to the impedance of the. sales@minicircuits. A known return loss is applied to the RF OUT port. In Figure 14, the ADL5920 is being used to measure the return loss of the load, also at 1 GHz. Hey, this part is pretty-well matched! You lose less than 0. The VSWR is about 1. Insertion loss causes due to two factors namely ohmic loss, dielectric leakage and the return loss is caused due to mismatched systems. -30-25-20-15-10-5 0 0. Convert VSWR to Return Loss and vice versa. Let’s calculate Voltage standing. A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line2. Value dB. every RF has one largest selection of online calculators for the RF and Microwave Industry. Convert VSWR to Return Loss and vice versa. This is an ideal situation that rarely, if ever, is seen. To help the engineers conducting VSWR sweeps, Lou developed the PIM and. everything RF has the largest selection is online numerical for and RF and Microwave Industry. R is the symbol for return loss, which as previously discussed is the ratio, in decibels, of incident power P incident to reflected power P reflected, or incident voltage to reflected voltage, described in the following two formulas. RETURN RETURN RETURN RETURN RETURN LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. 9. Learn about voltage standing wave ratio (VSWR), return loss, and mismatch loss, which helps characterize the wave reflections in a radio frequency (RF) design. The return loss and VSWR measurements are key measurements for anyone making cable and antenna measurements in the field. The input to the antenna will be 8,511 watts. Power to Voltage. There is a mathematical equation to accurately calculate the VSWR of an RF system. Because of this, the effects of mismatch can be minimized by selecting an attenuator with the lowest possible VSWR. They are related but measure different aspects of signal performance. Convert VSWR to Return Loss, Reflection Coefficient, and Mismatch Loss with our easy conversion calculator. Reflected power ratio for system 1 is 0. As the VSWR increases, the quality of the match deteriorates and more power is reflected back. ABOUT US. Upon arriving back at the source, part of the reflected wave is coupled back. If you only need to convert between GAMMA, VSWR, and dB, you can ignore Zo and ZL. 34:1 or a return loss of 16. Example 1: Cable Loss of 3 dB Cable loss: 3. Return loss = 10 log (Pr / Pi) = 20 log (Er / Ei) For example, if a load has a return loss of -10 dB, then 1/10 of the incident power is reflected. You would think this answers the question. In an ideal RF system, all of the energy from the RF source is transferred to the load. Example 2. Primary Sidebar. The VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient based on any one of the listed inputs. By the way, here is a page that summarizes Greek letter usage in Microwave Engineering. It is expressed in dB. The value of VSWR = 10 in the previous example is considered to be too high. SFDR Visualizer This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. 727 p asternaom VSWR, Return Loss and Transmission Loss vs Transmission Power VSWR Return Loss (dBm) Trans. Dual Dielectric Coax Calculator. Use at your risk. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. This calculator is designed to give the efficiency loss of a given antenna, based on the input of VSWR (voltage standing wave ratio) and other subsequent factors. reflection coefficient definition. Channel Emulators/Simulators. Formally, S11 is the negative of return loss and. 4 ms—500 forward and 500 reverse samples are collected on each cycle. everything RF has and larges selection from online calculators for an RF plus Microwave Industry. e. It varies from 1 to (plus) infinity and is always positive. VSWR Return Loss Calculator. To use this calculator to determine the effective VSWR/Return Loss of an attenuator/device combination, enter the attenuation, VSWR or Return Loss, and Gain of the device, then press the ‘Calculate button’. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. It turns out that -13. Return loss is when the transmitted signal is not completely. Stage: NF (dB) Gain (dB)0. Find VSWR (Voltage Standing Wave Ratio), Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. From the table we can understand that when the return loss is <10dB, the antenna will be at VSWR >2, indicating the system will reflect >30% power and the performance of the antenna will be <70%. Free Online. Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of a resistive matching Pi attenuator. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. VSWR to Return Loss (dB) Calculator. Convert the load VSWR to load return loss per the following equation: RL Improved = 2*Attenuator + RL Load [dB] (where RL=Return Loss) Of course, the method can be reversed to predict the attenuator required to improve a load VSWR by a predetermined amount. com Reflections propagate back and forth in a line, but most assessments only consider the effects of the initial reflection because the back and forth energy attenuates until it is untraceable. Formally, S11 is the negative of return loss and has. Following calculator can be used to convert VSWR to corresponding return loss (RL). VSWR / Return Loss Calculator. 2. A match is good if the return loss is. This is an online calculator that calculates Return Loss based on. In general, a lower VSWR means a system and load is well matched with most of the power being radiated by the antenna and a relatively small amount reflected back. The voltage standing wave ratio (VSWR) is defined. Just enter the value and please calculating. Unless you have a piece of slotted line-test equipment this is a hard definition to use, especially since the concept of voltage. Particularly, reflected performance and mismatch loss help delineate the need for the antenna (with its matching network) to offer a suitable return loss to the active electrical. It varies from 1 to (plus) infinity. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch loss. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. VSWR ( VSWR meaning Voltage Standing Wave Ratio) is an important concept in radio frequency (RF) engineering.