VSWR is defined as the ratio of the maximum to minimum voltage on a loss-less transmission line (expressed as 3. VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. Link Budget Calculator Determine the received signal strength (in dBm) given a systems amplifier gains, antenna gains and space loss. 1) (2. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Enter. Pasternack's VSWR/Return Loss. This collection of RF and Power Management design tools reflects Qorvo's commitment to the engineering community. A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission lineVSWR Monitoring System The MAX2016 is a dual logarithmic detector/controller used to monitor the VSWR/return loss of an antenna, when it is paired with a circulator and attenuator. Select operating frequency. 01. Learn about voltage standing wave ratio (VSWR), return loss, and mismatch loss, which helps characterize the wave reflections in a radio frequency (RF) design. Figure 1. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. 5. Use the S11 value in the calculator above to find the equivalent VSWR. VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. Therefore, the return loss parameter RL can only be used to express the mismatch of R L to Z 0. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). Urgent questions should be send via email. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. 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. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. This calculator converts values between VSWR, Return loss, Reflection Coefficient and Mis-Match Loss. Pasternack's Friis Transmission Equation Calculator is a path loss calculation measurement tool that calculates the received power from an antenna at some distance given a transmission frequency and antenna gains. 5dB loss per 100 feet at 146 MHz). This test determines the return loss value of each connector pair, cable component and cable to identify the problem location. 7145 VSWR 6 Directivit y of directiona l coupler 23 dB 0. LDF4-50A, HELIAX ® Low Density Foam Coaxial Cable, corrugated copper, 1/2 in, black PE jacket Halogen free jacketing non-fire-retardant (General propose cable for outdoor use only) Find a Partner. How to Calculate VSWR . Step 2. Due to reflections, an additional loss of 0. As the VSWR increases, so also does the percentage of reflected power. VSWR merupakan parameter yang juga sebagai penentu matching antara antena dan transmitter. This online reflection coefficient to VSWR calculator calculates the VSWR by entering the reflection efficient Γ (= value between 0 & 1). , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. 0. 5:1 VSWR is equivalent to -13. You can assume power dissipation to be uniform, provided the assembly does not operate in high VSWR/return-loss conditions. The concept of loss factor is discussed on this page. VSWR is defined as the ratio of the maximum voltage to the minimum voltage in standing wave pattern along the length of a transmission line structure. Introduction Input Type: 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. offices email call. Formula is:: reflection coefficient (Γ)=. To do this, I start at the input port and re-calculate the return loss for each component, factoring in the insertion loss of the previous components in the chain, as they will help improve the component's VSWR further down the chain: As seen from the Input Port: ERP Calculators, Coax Line Loss Calculators and Calculators of All Sorts. Loss factor. voltage standing wave ratio 020710. 1) RL dB = 10 log P i P r. 4. 58 dB in return loss. 600mW. The relationship between composite return loss and individual return loss in the constructive condition of identical mismatches is that the composite VSWR is the the square of the individual VSWRs. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. A low VSWR will minimize reflections from the antenna. 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. Lumped Quadrature Coupler Designer Enter the frequency of operation and system Z0. 1) (7. 0:1). Print - Advertisement - A calculator designed to. It varies from 1 to (plus) infinity and is always positive. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. spacing could be found. 2 8. 6dB. Click here to use the VSWR Calculator. N = current stage. We know that the nominal loss of the line is 2 dB. Values for L, C1 and C2 and R will be calculated. 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. And S12 is the power from radio 2 that is delivered through. Learn about voltage standing wave ratio (VSWR), return loss, and mismatch loss, which helps characterize the wave reflections in a radio frequency (RF) design. Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). Power to Voltage. Return loss is a meas-ure of how well devices or lines are matched. It's located in our download area . Wavelength to Frequency. As an added bonus, the results are modifiable and can calculate the other values. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. Return loss is the fiber optic light gets reflected back at the connection point. ERP, Line Loss and Various Calculators, Antenna Voltage and Current and Feedline Voltage and Current. 8. 3. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Telegram. Return loss is a measure of how well devices or lines are matched. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. As an example, input power of 100 W (50 dBm) and output of 50 W (47 dBm) yields a cable. Power to Voltage. Formula is:: reflection coefficient(Γ)= VSWR = VSWR Calculator:(by using RL)The VNAs with math modes can also directly calculate and display the resulting VSWR value. Return loss can be measured by using microwave and RF test. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. Pout is the output power or signal level. Return Loss [dB] Input Power [dBm] [W] VSWR :1 : Mismatch Loss [dB] Reflection Coefficient : Reflected Power [dBm] [W] Output Power [dBm] [W] Share your thoughts. The low-pass filter often is a natural choice for lumped element filters. A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission lineThis VSWR / Return Loss calculator allows you to compute corresponding VSWR, Return Loss, Reflection coefficient and Mismatch Loss values for the entered input value and. Calculate VSWR, Return Loss, etc. Mixer Spur Search Calculate a list of mixer spurious responses for a set frequency plan. Nice Voltage Standing Wave Ratio (VSWR) calculator is given on this page, converting between reflection coefficient, gamma (in both percent and decibels), and mismatch. 79. As the VSWR increases, the quality of the match deteriorates and more power is reflected back. Stripline Impedance calculator Smith charts VSWR/Return loss converter. is of particular concern in the implementation of Gigabit Ethernet (1000BASE-T) The value of impedances at the ends of the link must be equal to the characteristic impedance of the link. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. 500VSWR Calculates VSWR 1. VSWR = Voltage standing wave ratio. 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. g. In no event will Qorvo be liable to any user of these tools for any loss or damages, including without limitation, indirect or consequential damages arising out of or associated with the use of these tools. 000Match Efficiency (%) Calculates Match Efficiency. so you need to calculate both. Value dB. Power on the Site Master and press the MODE key. A match is good if the return loss is high. Return Loss is a logarithmic scale, and Voltage Standing Wave Ratio (VSWR) is a linear scale. and Canada (866) 727-8376 International +1 (949) 261-1920Enter the power of your VTX and your antenna's to estimate your range. Reflected Power. Therefore, a VSWR of less than 1. Note: The calculations for Total P1dB and NF use linear values. 1. Low-pass lumped element filters. VSWR. So a return loss of 20dB indicates a reasonably good match. WhatsApp. A series of RF calculators for radio frequency engineers. Calculate return loss, reflection attenuation from a VSWR level. Wavelength. ZoA return loss of -40 dB is 1. Return Loss (dB) VSWR. 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. VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. It is specified in decibels (dB) relative to a short circuit (100 percent rejection). 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. Linkedin. 2. For support with the MatchCalc tool, contact tool-feedback@qorvo. Just enter the value and click calculate. Enter values for R1 and R2 to calculate attenuator loss and impedance. 1Here are some examples of the logarithmic scale, or loss in decibels: Return Loss & VSWR Table. Add to My Products Lists. Return Loss (dB) = 10 x Log ( Pr / Pf ) Match Efficiency (%) = 100% x (1 - Pr / Pf)Determine how to calculate the effect of VSWR on Return Loss. Refl Coeff Power Transpower. 2 means a peak voltage 1. 979Return Loss (dB) Calculates Return Loss -13. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). The equivalent VSWR is 1. Calculate VSWR, Return Loss, Reflection Coefficient, Match Efficiency, and Net Transmission Loss from an RF broadcast transmitters forward and reflected power readings. 72 0. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. Fairview Microwave's Friis Transmission Equation Calculator will calculate the received power from an antenna at some distance given a transmission frequency and antenna gains. 05:1 it calculates a VSWR of 1. In this Inside Wireless episode we will look at Voltage Standing Wave Ratio (VSWR), |S11|, and Return Loss. The path loss that might be measured in a system however will not be this. 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. Suitable for higher power (~1800 watts) at HF. For a VSWR of around 5. VSWR Calculator. Forward Power vs Return Loss Calculator RF calculators and converters. The online calculators are usable in pop-up mode for easy desktop access and functionality. 5:1 정도로써 입력매칭이 거의 완전하게. 5:1. 6dB. A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line T-Pad Attenuator Calculator This calculator helps you determine the values of the resistors R1 and R2 to be used for a T-pad attenuator. 8ghz. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. Loss (dB) Volt. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. Frequency to Wavelength. Custom. com This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. The VSWR monitoring system consists of an ADC for real-time measurements. 26 (800) TMS-COAX • LMR-400 TIMES MICROWAVE SYSTEMS Connectors Inner Outer Finish* Part Stock VSWR ** Coupling Contact Contact Body Length Width Weight Interface Description Number Code Freq. 1:1 5 0. 54-88 MHz -- Low VHF; 88-108 MHz -- FM;S11 then would be the reflected power radio 1 is trying to deliver to antenna 1. 0:1, 2. To calculate VSWR for this interface, simply take the ratio of the largest standing wave to the smallest standing wave. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and mismatch loss (ML) is calculated by using following formulas. Set the start and stop frequencies F1 and F2. The calculator will only return data for frequencies below the cutoff frequency of the cable. There are two S-parameters of interest. 0:1). 002 respectively as shown in table-6 for the notch width, g=1. Where, RL = Return loss in dB. See full list on allaboutcircuits. Where I2 is the cell containing the VSWR. The calculator on this page helps determine the loss and that can be factored into the design or RF link budget. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. A01TKL_ RF Inductor by Coilcraft →. 200mW. comTwo years ago, one of our most respected RF experts, Lou Meyer, wrote a blog post describing the technicalities of return loss and voltage standing wave ratio (VSWR) and how the multiple components at a cell site tower make the calculations more complex. 4ghz. This calculator is used to calculate the uncertainty of gain for any active RF device (mostly amplifier) that occurs because of the impedance mismatch. In either case, the resulting VSWR is 1. This calculator converts values between VSWR, Return loss, Reflection Coefficient and Mis-Match Loss. For a VSWR of 2, the mismatch loss is calculated to be 0. 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. 92 dB 0. Return Loss or a VSWR: return loss (dB) (evaluated as neg. This impedance mismatch can be with a device inserted in the line or with the terminating load. A high VSWR indicates poor transmission-line efficiency and reflected energy. complimentary copy of the "RF Calculator" at . 9 mm which. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). While we’re at it, the reflection coefficient is: Γ=(75-50)/(75+50)=0. A VSWR of 1:1 means that there is no power being reflected back to the source. In some systems this is not a trivial amount and points to the need for components with low VSWR. For five t-line sections each having a VSWR of 1. VSWR adalah VSWR juga dapat di artikan sebagai perbandingan antara gelombang maksimum dengan gelombang minimum. 1) RL dB = 10 log P i P r. Hey, this part is pretty-well matched! You lose less than 0. Return Loss is similar to VSWR and is generally preferred in the cable industry to a VSWR. VSWR is defined as the ratio of the maximum voltage to the minimum voltage in standing wave pattern along the length of a transmission line structure. VSWR calculator. Calculate! Where do these calculations come from? Well, start with the formula for VSWR: If we invert this formula, we can calculate the reflection coefficient (, or the return loss. 4) The reflection coefficient is calculated from the characteristic impedance of the transmission line and. Then, take the logarithm base 10 of the result and multiply it by 20. Return loss is a measure in dB of the ratio of power in the incident wave to that in the reflected wave, and we define it to have a negative value. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. 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 two simple. Return loss is related to both standing wave ratio (SWR) and reflection coef-ficient (Γ). Both terms are used to characterize the uniformity of a cable’s impedance along its length as it relates to reflected energy. The antenna accepts a certain amount of energy delivered to it by the transmission line (characterized by S11, VSWR, or return loss), and Antenna Efficiency characterizes the amount of energy lost ‘in’ the. 9, for system 2 is 0. It is specified in dB. The easiest way to improve return loss is to add an attenuator. 1060. Stripline Impedance Calculator Calculate Stripline impedance for given PCB parameters. 01. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. Formulas used: s r r. Figure 1 — A graph showing the additional loss in a transmission line due to SWR. 54 dB (11% of your transmitter power is reflected back). Mismatch Loss (dB). The return loss conversion table is a valuable tool for antenna engineers, allowing them to quickly and accurately convert the VSWR values they measure into return loss values. 1, for system 2 is 0. e. In some systems. It displays the impedance of the input and output match in a 50Ω test environment as measured on a network analyzer. If you provide an email address I can share a system. RF calculations and RF conversions include metric. Reflections are measured using either VSWR or Return Loss. The Voltage Standing Wave Ratio (VSWR) is defined as the ratio of the maximum amplitude to the minimum magnitude of the voltage standing wave at an input port of an antenna. VSWR (Voltage Standing-Wave Ratio) VSWR is the ratio of the maximum to minimun. Reflected power ratio for system 1 is 0. ,100 % power transferred from a source to a load via a transmission line/cable). A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line T-Pad Attenuator Calculator This calculator helps you determine the values of the resistors R1 and R2 to be used for a T-pad attenuator. Enter Input Value Output. The return loss at the input and output ports can be calculated from the reflection coefficient, S 11 or S 22, as follows: RL IN = 20log10|S 11 | dB. 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. In one typical RF application, VSWR is. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. By the way, here is a page that summarizes Greek letter usage in Microwave Engineering. The following formula relates the return loss and VSWR. This ratio can also be measured in dB, and expressed as Return Loss. 15. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. Return Loss is the ration of the reflected signal to the incident signal. 891: 6. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. ZoLDF4-50A. B at a level of -32 dBm. This formula is used to calculate the VSWR from the given return loss. Reflection Coefficient to Impedance Converter Convert a reflection coefficient in Magnitude Angle format into Impedance and vice versa. You can calculate return loss when the VSWR is known. The VSWR can easily be converted into Return Loss ( RL R L ) using the following formula: RL = 20log10(VSWR + 1 VSWR − 1) R L = 20 log 10 ( V S W R + 1 V S W R − 1) Directional power meter. Elite RF. A calculator designed to compute and calculate the VSWR, return Loss of a circuit and matching loss in a transmission line based on the parameters you enter. 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. 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 Calculator. The following table provides conversions for wavelength (from frequency), VSWR (from forward and reflected power). Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. VSWR Return Loss (dBm) VSWR Return Loss (dBm) VSWR Return Loss (dBm) VSWR. Cable impedance ohm. Enter LO Tuning Range, IF frequency/bandwidth and injection side. The following equation is especially useful when using a directional power meter. RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. מדריך שלם ל- VSWR מ-FMUSER [עודכן 2022] בתורת האנטנות, VSWR מקוצר מיחס גל עומד מתח. 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. Return Loss is the portion of a signal that is lost due to a reflection of power at a line discontinuity. How to Calculate VSWR . Preferred resistor values are entered into the text boxes, similar to the way that values for a prototype may be selected. Measure S11 across the desired frequency range. Load serial resistance and reactance ohm. Return loss is when the transmitted signal is not completely. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. 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%. 15 + 1. (3) ea 90°E-Bend - 1. The Reflection Coefficient can be calculated from return loss by using the following formula. Its VSWR is specified at 1. A SWR can be also defined as the ratio of the maximum amplitude to. The VSWR value range from 1. The isolation S23 is exactly -20 dB at the center frequency, while the output match is also. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. S. Given a certain level of heat generation within an assembly, thermal dissipation occurs through three primary mechanisms. 25mW. The return loss calculator provides quick conversions from among VSWR, return loss, and reflection coefficient. R = 10log 10 (P incident /P reflected) and. Let’s start by looking at a 2-port device illustrated in Figure 1. VSWR is essentially the ratio of the Input Impedance to the average Characteristic Impedance as a result of. From this the reflection factor Γ and the Voltage Standing Wave Ratio (VSWR or SWR) could be determined using the following definitions: – Γ is defined as the ratio of the electrical field strength Eof the reflected wave over the forward travelling wave: Γ = Eof reflected wave Eof forward traveling wave. However, each field, when changed will allow. ← Conducted RF Environments With Real RF Devices Vs. These measurements show the user the match of the system and if it conforms to system engineering specifications. Return loss vs. Assuming the systems have no internal loss. Channel Emulators/Simulators. 707. 333, a mismatch loss of 0. . —and. ZoThus, for this system, VSWR = 1:1 (i. Tee Attenuator Calculator. 72 0. Once the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. $ = Gamma^2 = 10^{-RL/10}$ Power transmitted ratio for system 1 is 0. This impedance mismatch can be with a device inserted in the line or with the terminating load. As an example, F1=750 MHz and F2=850 MHz for a typical cellular frequency band. But, for a practical system, there will be a small impedance. These calculators help with unit conversions, VSWR calculations, attenuator design, antenna design, radars, and various other basic calculations that are often required. High return loss means low reflected power, so high return loss is good for a system. They will show SWR and Return Loss (RL). Note that it blows up at the lower cutoff frequency of 6. (under "Support" and "Technical Application Notes" tabs). VSWR & Return Loss Calculator Enter forward and reflected power or match to determine equivalent values. A power meter may also be used to calculate cable loss. Coupling to Direct Line Insertion Loss Conversion Table for Directional Couplers. VSWR Calculator. 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. Antenna Downtilt and Coverage Calculator. VSWR is a measure of the reflected power on a transmission line. That is, the amount of signal reflected by a connector. PLL loop filter calculator This tool will calculate the component values for a 3rd order loop filter. WhatsApp. 4. Select the FREQ-RETURN LOSS using the Up/Down arrow key and press ENTER. This is equal to a return loss of 14 dB or greater. Facebook. 39 0. VTX Power in mW. Just keep in mind that SWR and Return Loss are both indicators of the quality of the transmission line to antenna feedpoint Z match. Consider the antenna being used in transmit mode. Qorvo Interactive Tools & Calculators. Suitable for higher power (~1800 watts) at HF. These multiple solutions are possible because each contributor is a vector having both. 2 times the minimum voltage along that line, if the line is at least one half wavelength long. אנו יודעים שהגל העומד, המסביר את יחס הגל העומד, הוא. A good VSWR to aim for is at least 1. When an ideal match is not encountered by the incident (forward) wave, part of it is coupled to the load and part is reflected back to the source. vswr Excel calculator. S-parameters, S11 and S21. Return Loss has surfaced in our ham world due to the new handheld antenna system analyzers like the Nano VNA and others. Because VSWR and return loss are two ways to measure the same property, you can use the following equations to convert between the two: To understand these theoretical concepts better, let’s consider a. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. Qorvo MatchCalc is a free downloadable RF/microwave matching calculator with ideal tunable passive components. Wavelength Calculator. Now, let us investigate the physical meaning of return loss. 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. October 20. A common example is a power amplifier. 7. Print - Advertisement - A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line Inputs. VSWR = Voltage standing wave ratio. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. Source Return Loss Var1. Thus with ~ 25% reflected power: Return Loss = -10 x Log [ 100/25. 05 VSWR max. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit .