4569. 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. The below step by step solved example problem may helpful for users to understand how the input values are being used in such calculations to find the ratio of load impedance matching to the transmission line or wave guide characteristic impedance (Z 0). 5:1 정도로써 입력매칭이 거의 완전하게. Wavelength Calculator. 045 foot x 12 inches/foot x 1000 mils/inch=540 mils. It also shows the percentage of forward to reflected power. 43. e. Here's the unwrapped phase of S21:by Eamon Nash Download PDF. A power meter may also be used to calculate cable loss. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. e. 54dB. VSWR: RL (dB) 1. ANSOFT CORPORATION HFSS FIELD CALCULATOR COOKBOOK INTRODUCTION feature of Ansoft’s HFSS Version 7. (also called insertion loss). The online calculators are usable in pop-up mode for easy desktop. A ratio of 2:1 indicates that reflections have. This calculator computes the VSWR, reflection coefficient, return loss and matching loss in a transmission line. These calculators help with unit conversions, VSWR calculations, attenuator design, antenna design, radars, and various other basic calculations that are often required. Recall that signs of reactances are missing on the full chart. VSWR is commonly expressed as a ratio. Power Density Calculator is designed to give the power density, in Watts per square meter, at a given distance, output power and antenna gain. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. Measuring Insertion Loss using RETURN LOSS MODE. The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. This is equivalent to VSWR 5. 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. This impedance is the equivalent of a 32. It's assumed that the source impedance is also complex. The VSWR is a measure of the matching of the antenna to the source and feeder cables. Print - Advertisement - A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line Inputs. Unequal-split Power Divider Calculator. 299 0. g. Return Loss VSWR Reflection. Understanding VSWR and Return Loss. Return loss calculation EXAMPLE : VSWR = 1. 0. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). As an added bonus, the results are modifiable and can calculate the other values. Therefore, a VSWR of less than 1. In industry, VSWR is sometimes pronounced "viz-wer". The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. 064 36. 223:1 VSWR (It is slightly improved because of Component A having more insertion loss than. 15 + 1. The relation between return loss, VSWR, and the reflection coefficient provides a comprehensive view of the system's efficiency. This is described in more detail on a separate page. 3 Attenuation Frequency (MHz) Attenuation (dB/100 m) Attenuation (dB/100 ft) Average Power (kW) 1. VSWR Calculator. Requires Windows 7 (64 Bit) or higher. There is also a selection of suitable RF. Calculate the VSWR to 1 decimal place. Electrical waves reflect when they encounter a change in the impedance of the medium they are traveling in. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). 0 is the minimum. 12 VSWR max. This is an online conversion tool for converting between VSWR, return loss and reflection coefficient, which are different ways to express how well a load is matched to a source. These are considered to be standardized impedance values with cables readily available. e. Calculate the VSWR in another column. g. 19. Any other value indicates that a portion of the energy is reflected. Any other value indicates that a portion of the energy is reflected. VSWR / Return Loss Calculator; IRA Calculator; Wavelength (TEM) Calculator; Link Budget Calculator . 0. These multiple solutions are possible because each contributor is a vector having both. To help the engineers conducting VSWR sweeps, Lou developed the PIM and. S-parameters, S11 and S21. Radio Frequency Engineering Calculator. VSWR Calculator. 7. 0 indicates 44% of the power is delivered to the antenna (3. A table of convenient values are presented at the bottom. Vswr To Rl Formula. LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. An equation for the prediction of the Return Loss of cascaded systems has been previously presented and validated. So Return Loss is positive quantity RL (dB)= Incident power ( Pi)/Reflected power (Pr. These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). YourR 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 Loss = incident power/ reflected power. Usually this is the threshold when most devices are considered. 0 is the minimum. Just enter the value and click calculate. Convert VSWR to Return Loss and vice versa. 35. A perfect match would be 1:1, meaning that the peak amplitude of the signal is always the same (i. A perfect match would be 1:1, meaning that the peak amplitude of the signal is always the same (i. The component is said to have a loss of 25 dB. Consumers; Contact Us;A network analyzer can be used to make S parameter measurements. Directivity and VSWR Measurements. Mismatch Loss: Reflected Power Through Power (dB) Coefficient,VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). Return Loss (dB) 3. 1 Return loss in dB = 26. VSWR to Return Loss Reference/Conversion Table. , there is no standing wave). A known return loss is applied to the RF OUT port. . Since it is a logarithmic measurement, it is very useful when displaying very small reflections. Convert VSWR to Return Loss, Reflection Coefficient, and Mismatch Loss with our easy conversion calculator. The isolation S23 is exactly -20 dB at the center frequency, while the output match is also degraded to about -13. Select operating frequency. It also shows the percentage of forward to reflected power. 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. Thus, for this system, VSWR = 1:1 (i. VSWR Calculator:(by using RL) return loss(RL)= VSWR = RF Coax Cable Assembly Designer: Most Viewed Companies MegaPhase, LLC. Elite RF. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. Free Online Engineering Calculator to quickly convert a Return Loss (dB) into a VSWR. Pasternack's VSWR/Return Loss Calculator finds VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. 7. USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. be used to add or subtract an arbitrary number of power, to convert power and voltage units from the linear to the logarithmic. The load ZL imposes an additional constraint on the relationship of the total voltage and current at z = 0: VL IL = V(z = 0) I(z = 0) = ZL. 46 2. Pi Attenuator Calculator. 0 Return Loss / VSWR. 8. VSWR specs (specifications) are introduced, along with formulas for mismatch loss and return loss in relationship to VSWR. 4ghz. Values for L and C will be calculated for the four topologies shown. Furthermore, a small VSWR reduces reflections from the antenna. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. e. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. In Figure 14, the ADL5920 is being used to measure the return loss of the load, also at 1 GHz. Figure 1. Solved Example. Return Loss (RL) is a measure of all reflections that are caused by the impedance mismatches at all locations along the link and is expressed in decibel (dB). 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. Useful converters and calculatorsVSWR & Return Loss Calculator: Enter forward and reflected power or match to determine equivalent values. In terms of the reflection coefficient: If VSWR = 1, G 0 = 0 (no reflection) = vp f, vp= c r 0 100 200 300 400 500 600-1. Despite Equation [Math Processing Error] 10. 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. 54 dB (11% of your transmitter power is reflected back). $\endgroup$ – Return loss can be converted to mismatch loss and the calculator also gives an intuitive sense of the impact by providing the forward and reflected power ; Related Posts. 5:1 is considered ideal in the RF field, and a VSWR of 2:1 is marginally acceptable for more critical loss systems for low-power applications. 51 dB, and a return loss of 9. VSWR is another way of measuring signal reflections. Clear. These reflections are very undesirable when we aim to transfer power from one. 8. 5, the corresponding value of. You calculate return loss by using the reflection coefficient, which measures the ratio of the reflected wave to the incident wave at a given point in the transmission system. Note: If you select a waveguide size from the dropdown below, the broad wall width will be automatically calculated along with the other results. 15 + 1. cdn-anritsu. 1. Measurement and control of gain and reflected power in wireless transmitters are critical auxiliary functions that are often overlooked. offices email call. การใช้งาน vswr: หน้าที่หลักของ vswr : เสาอากาศส่งสัญญาณ: อัตราส่วนคลื่นนิ่งของแรงดันไฟฟ้า (vswr) เป็นตัวบ่งชี้จำนวนค่าที่ไม่ตรงกันระหว่างค่า ante nna และ. Home Return Loss to VSWR Conversion Chart Due to mismatches in impedance within the connector, some of the signal is reflected. Calculate VSWR from Forward and Reverse Power. This is an online calculator that calculates Return Loss based on Reflection Coefficient. dl. In Excel this can be done using the max function such as "=max(0. Qorvo MatchCalc is a downloadable RF matching calculator designed to provide ideal component values for matching the impedance of a S1P or S2P file to a desired system or reference impedance. 5 VSWR = Vmax Vmin ≥ 1 VSWR = 1 ∣ 0∣ 1−∣ 0∣ Voltage Standing Wave Ratio VSWR = Voltage Standing Wave Ratio (sometimes just called SWR)Figure 13. If we measure the power of a reflected signal from an antenna near a radio transmitter, the measurement of the reflected signal’s amplitude at this juncture compared to the initially transmitted. Vswr To Rl Formula. A high. 0708,min,max = =A VSWR value of 2 or under is typically acceptable for antennae in communications systems. VSWR table of return loss vs. Please note that this. Formally, S11 is the negative of return loss and has. The ideal condition, whereYou can assume power dissipation to be uniform, provided the assembly does not operate in high VSWR/return-loss conditions. 5 1 1. coefficient of Port 1 (also called return loss), and. By definition currents going into the n-port are counted positively and currents flowing out of the n-port negatively. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. 000:Return Loss (RL) and Voltage Standing Wave Ratio (VSWR) are related through a mathematical relationship. [email protected] insertion loss, return loss is also generally described in decibels of power. 1060. Pi Attenuator Calculator. All our transmitters above 50W feature a simple Forward and Reflected power meter on the front panel. 7. It turns out that -13. In an RF system, when power is sent from the source to load, there are three main parameters to be considered: (1) incident power; (2) reflected power; and (3) power absorbed by the load. The following formula is used to calculate the Return Loss (RL) from Voltage Standing Wave Ratio (VSWR). VSWR. 98 dB is equal to the equaivalent return loss of 1. 011. Since the antennas showed low return losses compared to. The term ‘forward power is synonymous with powered deliver to the load, or thru power. 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. 3 1700–2200 MHz 1. USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. The corresponding value in the right column is the VSWR value. On the other hand, VSWR and the reflection coefficient are connected by the equation: VSWR = (1+|Γ. A VSWR of 6 or more is pretty high and will generally need to be improved. For one example, if. Calculate VSWR, Return Loss, etc. 5 VSWR = Vmax Vmin ≥ 1 VSWR = 1 ∣ 0∣ 1−∣ 0∣ Voltage Standing Wave Ratio VSWR = Voltage Standing Wave Ratio (sometimes just called SWR)2. 13 24. , there is no standing wave). 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. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가. Complex Impedance for RL and RC. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. For VSWR=2, reflection coefficient will be=1/3 and 20log(1/3) =-9. 12] = 6 dB. The following equation is especially useful when using a directional power meter. Return Loss. Reflection -3dB: half of the RF energy is being reflected, and thus half of the energy is being received by the device. 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. A Forward and Reflected Power to VSWR Calculator is a tool that helps to determine the Voltage Standing Wave Ratio (VSWR) of a transmission line by using measurements of the forward and reflected power. Same-day shipping if you order in the next hours!. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. S11 then would be the reflected power radio 1 is trying to deliver to antenna 1. VSWR and Return Loss RF Calculator. Low-pass lumped element filters. transmitter) with the load (i. VSWR Calculator:(by using RL) return loss(RL)= VSWR = RF Coax Cable Assembly Designer: Most Viewed Companies MegaPhase, LLC. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. In order to get the best power transfer from a source to a load, the source impedance must equal the complex conjugate of the load impedance: Rs + jXs =RL −. 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. voltage standing wave ratio 020710. VSWR to Return Loss . VSWR to Return Loss Conversion Table. This can be achieved by regulating the inner and outer diameter of the coaxial cable, along with the. Summarizing: Directivity is ratio of power density in a specified direction to the power density averaged over all directions at the same distance from the antenna. III. VSWR. 5dB loss per 100 feet at 146 MHz). The calculated value is MUCH worse. You can access the RF Path Calculator at the Calculators page of our website. Follow the discussion. 672 0. voltage standing wave ratio. dl. Calculate SWR and return loss from impedance values. com +1 (718) 934 4500 +1 (800) 654 7949. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. Simply select the quantity of convergence points, adjust the length and select the cable from the menu to create a bill of materials will be generated - showing the minimum amount of items required to configure a system. 045 foot x 12 inches/foot x 1000 mils/inch=540 mils. Please enter your values below. U. The following variables can be changed in this tool: - Load VSWR. Definition and Background. Follow the discussion. These parameters are often applied to antennas, RF filters and RF amplifiers such as LNA s and PA s. RETURN RETURN RETURN RETURN RETURN LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. Return Loss is a logarithmic scale, and Voltage Standing Wave Ratio (VSWR) is a linear scale. LC Impedance matching network designer Enter the input and output impedances to be matched and the centre frequency. The table shows the effects of combining two components in terms of their maximum VSWR and return loss. Return Loss or a VSWR: return loss (dB) (evaluated as neg. Specifically, return loss is related to the reflection coefficient (Γ) as follows: Return Loss (dB) = -20 log10|Γ|. You can use our VSWR calculator to see that 1. For example, if you wish to input "25000000", just type "25M" instead. Understand the applications for the equation of VSWR on return loss in electronics. —and calculates both the typical system return loss along with the worst case return loss. com . What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. 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. Enter the source characteristic impedance and the load impedance then press "Calculate" below. VSWR indicates matching condition of source (i. 50 Ω adalah standart yang umum untuk aplikasi RF. In some systems this is not a trivial amount and points to the need for components with low VSWR. Visit Fairview Microwave's RF coaxial attenuators page for product details. These measurements show the user the match of the system. To convert from Return Loss to VSWR, find the return loss value in the left column. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. It is specified in dB. It is due to inherent imbalances in directional devices. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. flectioncoefficientΓ,voltagestandingwaveratio(VSWR) and return loss (RL) and these quantities are interre-lated. voltage standing wave ratio 020710. 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 ( VSWR meaning Voltage Standing Wave Ratio) is an important concept in radio frequency (RF) engineering. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. You can take the readings from. Directivity and VSWR Measurements. Voltage Measured Along a Transmission Line. VSWR table of return loss vs. You can use it for free. VSWR Return Loss Calculator. VSWR = Voltage standing wave ratio. Figure 2: VSWR Measurement Principle The return loss at the input and output ports can be calculated from the respective reflection coefficients as follows: Input return loss (RL IN) is a scalar measure of how close the actual input impedance of the network is to theThen computing VSWR (voltage standing wave ratio) is easy:. Return Loss (dB) VSWR. The load can be an antenna, filter or other equipment connected to a transmission line. 504pF. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). The return loss and VSWR measurements are key measurements for anyone making cable and antenna measurements in the field. $\begingroup$ If that was the only information you were given, you would first find the return loss looking at the load, then use system 2's S matrix to find the RL looking into it, then do the same with system 1 until you finally have the RL looking into the entire network. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. It is related to return loss as follows. Click here to use the VSWR Calculator . VSWR (voltage standing wave ratio, sometimes pronounced "viswar"), is the ratio of the maximum standing wave amplitude at one node to the minimum amplitude at another node in a system. VSWR: RL (dB) 1. Reflection Coefficient to Impedance Converter Convert a reflection coefficient in Magnitude Angle format into Impedance and vice versa. 1, directivity does not depend on the distance from the antenna. Noise Conversion Calculator. 64/100) = ±0. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. Voltage standing wave ratio (VSWR)Impedance Matching Pi Attenuator Calculator. 8 is 80%, or -0. Low-pass lumped element filters. Using complex impedance is an important technique for handling multi-component AC circuits. LC Impedance matching network designer Enter the input and output impedances to be matched and the centre frequency. RL = dB: VSWR =. g. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR = Reflection Coefficient = Return Loss = dB: Match Efficiency = % Net. 5 1 1. 8. A table of convenient values are presented at the bottom. VSWR is a measure of the reflected power on a transmission line. VRMSF and VRMSR are measured and the return loss is back calculated. There are two S-parameters of interest. 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. transmitter) with the load (i. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission lineThis VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. Step 1. Here we will learn more about the meaning of VSWR and the associated VSWR formulas. For support with the MatchCalc tool, contact tool-feedback@qorvo. 155 dB. In this case, you may also need to calculate localized heating due to a current standing wave. On the other hand, you calculate VSWR by using the maximum and minimum voltage levels of the standing wave pattern on a transmission line. Port 4 is the port which provides the reflected measurement (Return Loss/ VSWR), when the device is configured with the DUT connected to Port 2. Formally, S11 is the negative of return loss and. This can be built into a FLEXI-BOX and a transmission line PCB is. This is an ideal open or short circuit, equivalent to VSWR=infinite. 0 indicates 44% of the power is delivered to the antenna (3. S21 is the transmission coefficient of Port 2. Calculate the VSWR to 1 decimal place. A known return loss is applied to the RF OUT port. offices email call. Once the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. As an added bonus, the results are modifiable and can calculate the other values. Then click the "Calculate" button next to the value you just typed to compute the others. Enter VSWR (a value greater than or equal to 1) S11 to VSWR Formula S11 = (VSWR-1)/ (VSWR+1) S11 (dB) = 20*Log10 (S11) The input reflection coefficient, S11 < 1 Example Calculation For a VSWR of 1. 0 or the results don't mean anything!). Lower VSWR is always desirable for a system. For one example, if you have two 2:1 mismatches separated by some distance, the worst case at some frequencies will look like 4:1 VSWR. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. Reflection -10dB: 1/10 th of the RF energy is being reflected. By Marki Microwave, Posted Wed May 19 2010. The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of the listed input types. Subscribe to receive Mini-Circuits News. 405 inch. p65 Author: barbara Created Date:Return Loss is the portion of a signal that is lost due to a reflection of power at a line discontinuity. Voltage standing wave ratio (VSWR) (pronounced "vizwar" [1] [2]) is the ratio of maximum to minimum voltage on a transmission line . 98 dB return loss. Return Loss is the amount of power that is lost in the signal returned/reflected by a discontinuity in a transmission line. 091 25. Pout is the output power or signal level. Fortunately, there’s a very easy way to analyze complex loads using graphical methods and it’s called the Smith Chart. Values for L and C will be calculated for the four topologies shown. We have designed a special VSWR and Return Loss Calculator. 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. Now, let us investigate the physical meaning of return loss. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. The VSWR value range from 1. 64% or ±10 x log10 (103. VSWR to Return Loss . Calculate. Set the start and stop frequencies F1 and F2. The new calculator remains Excel-based; however, provides an enhanced interface so users can: Add radio/tester as a component as it impacts some calculation. For series combinations of components such as RL and RC combinations, the. Because of this, the effects of mismatch can be minimized by selecting an attenuator with the lowest possible VSWR. Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). It turns out that -13. Forward Power Watts ? Reflected Power Watts ? VSWR → RL (Return Loss). VSWR measures the ratio of voltage peaks and valleys. 0708,min,max = =A VSWR value of 2 or under is typically acceptable for antennae in communications systems. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. To convert from VSWR to Return Loss, find the VSWR value in the left column. 8. Return loss, also known as reflection loss, is a measure of the fraction of power that is not delivered by a source to a load. RL = 20 * log10 ( (VSWR + 1) /. The calculated value is MUCH worse. 5:1. 0. There are two S-parameters of interest. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. 5:1. Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). VSWR table of return loss vs. VSWR (pronounced "viswar"), or the Voltage Standing Wave Ratio, is the ratio of the maximum standing wave amplitude at one node to the minimum amplitude at another node in a system. VSWR/Return Loss Frequency Band VSWR Return Loss (dB) 680–800 MHz 1.