It's assumed that the source impedance is also complex. Useful converters and calculatorsVSWR & Return Loss Calculator: Enter forward and reflected power or match to determine equivalent values. Even if a computerYoni Calculator Online Test System Configurator ezSample. 4 centimeters. 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. Return Loss to VSWR Calculator. VSWR is referring to the maximum and minimum voltage values that is being transmitted and reflected by the component. Home. 011. In some cases, users require a custom impedance value. 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. 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. Return Loss (dB) VSWR. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. 01:1 to 3. The ratio of the input to the reflected signal is. Polar or rectangular grids only allow direct reading of S11. 064 36. VSWR. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. The Insertion Loss formula is defined as the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels (dB) and is represented as I L = 20* log10 (V t / V in) or Insertion Loss = 20* log10 (Voltage / Input Signal Amplitude). number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. 64/100) = ±0. offices email call. 35. For example, if you wish to input "25000000", just type "25M" instead. Definition of VSWR. Directivity, on the other hand, is the level of the signal which appears at Port 4 and is undesired. But, for a practical system, there will be a small impedance. Enter the power of your VTX and your antenna's to estimate your range. 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. Calculate the VSWR in another column. At 100 MHz, the loss is 0. 98 dB is equal to the equaivalent return loss of 1. SummaryCoaxial Cable Impedance Calculator. 43. 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. This online reflection coefficient to VSWR calculator calculates the VSWR by entering the reflection efficient Γ (= value between 0 & 1). Convert VSWR to Return Loss and vice versa. VSWR Calculator The VSWR Calculator is a program for reflection unit conversion. com +1 (718) 934 4500 +1 (800) 654 7949. For S 11 it is also possible to display return loss and (voltage) standing wave ratio [(V)SWR] over frequency range. 5:1 정도로써 입력매칭이 거의 완전하게. S21 is the transmission coefficient of Port 2. and Canada (866) 727-8376 International +1 (949) 261-1920Installer for the Windows version of dB Calculator. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. Because the reflection coefficient Γ < 1, then the return loss will have a positive dB value. A similar version of this article appeared in the October 2012 issue of Power Systems Design magazine. Antenna). +1 829 698 0733 What Do You Need? Talk To Us 8am-4pm EST/NY Monday-Friday info@aareff. e. Advanced Control Components. VSWR Calculator. Individual calibration is generally recommended to account for manufacturing process variation. 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. 50:1, the resulting maximum VSWR will be 4. Forward Power Watts ? Reflected Power Watts ? VSWR → RL (Return Loss). This application note supplies a free of charge software tool that can e. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. Return Loss or a VSWR: return loss (dB) (evaluated as neg. Because of this, the effects of mismatch can be minimized by selecting an attenuator with the lowest possible VSWR. g. R = 10log 10 (P incident /P reflected) and. The low-pass filter often is a natural choice for lumped element filters. Note that we have a VSWR calculator that will allow you to convert between VSWR, mismatch loss and return loss!. dl. Return loss can be measured by using microwave and RF test equipment such as a signal generator, directional coupler along with a spectrum analyser or power meter, or alternatively by using a. 64% or ±10 x log10 (103. Two 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. Facebook. 2. Cable impedance ohm. (3) ea 90°E-Bend - 1. It measures how much energy is reflected back to the transmitter when a signal is transmitted through an antenna. 4ghz. By Marki Microwave, Posted Wed May 19 2010. 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. 405 inch. sales@minicircuits. It is related to return loss as follows. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. Then click the "Calculate" button next to the value you just typed to compute the others. Voltage standing wave ratio (VSWR) is a way to measure transmission line imperfections. A 2-port device has two distinctly interesting. 12] = 6 dB. 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. When a transmitted wave hits a boundary such as the one between the lossless transmission line and load (Figure 1), some energy will be transmitted to the. Free Space Path Loss Calculator Calculate the loss for a given distance at an RF frequency Enter distance in km and frequency in either MHz or GHz. g. Figure 14. To do so, calculate the desired return loss and subtract the known load return. To help the engineers conducting VSWR sweeps, Lou developed the PIM and. A VSWR of 6 or more is pretty high and will generally need to be improved. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. Figure 1. If a complex plane is used with resistance along the real axis then the reactances of the capacitor and inductor are treated as imaginary numbers. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. 34:1 or a return loss of 16. 1) RL dB = 10 log P i P r. 1. VSWR (:1) Return Loss (dB) Reflection Coefficient (Γ) Mismatch loss (dB) Reflected Power (%) Through Power (%) VSWR Calculator. flectioncoefficientΓ,voltagestandingwaveratio(VSWR) and return loss (RL) and these quantities are interre-lated. Pout is the output power or signal level. U. 4 centimeters. VSWR to Return Loss Conversion Table. This is the only way to calculate the total impedance of a circuit in parallel that includes both resistance and reactance. e. Values for L and C will be calculated for the four topologies shown. Mismatch Loss (dB) 3. A 2-port device has two distinctly interesting. 98 dB is equal to the equaivalent return loss of 1. 205 11. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. The Tee attenuator consists of one series resistor at the input and two parallel, one of which is grounded while the other goes to output. Lower VSWR means lower reflection power (good impedance matching); thus, power transfers to load will be high. On the other hand, you calculate VSWR by using the maximum and minimum voltage levels of the standing wave pattern on a transmission line. This tool calculates the S11 from the Voltage Standing Wave Ratio (VSWR). Complex Impedance for RL and RC. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. and is usually expressed as a ratio, such as VSWR = 3:1. VSWR to Return Loss Reference/Conversion Table. 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. SWR / Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. Furthermore, a small VSWR reduces reflections from the antenna. 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. reflection coefficient Calculator. By definition currents going into the n-port are counted positively and currents flowing out of the n-port negatively. Determine how to calculate the effect of VSWR on Return Loss. 5 10. How to Use? Using the VSWR to RL Calculator involves the following steps: Enter VSWR Value: Input the VSWR value that you want to convert into RL. For series combinations of components such as RL and RC combinations, the. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. How to improve the Return Loss of an amplifier. 3. 09 = 1. 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 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. The calculated value is MUCH worse. 92 dB 0. Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. October 20, 2022. Example 2. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. Low-pass lumped element filters. reflection coefficient definition. 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. In the above. The return loss scale is normally set up from 0 to 60 dB with 0 being an open or a short and 60 dB would be close to a perfect match. 34:1 or a return loss of 16. 299 0. Return Loss is a logarithmic scale, and Voltage Standing Wave Ratio (VSWR) is a linear scale. It also shows the percentage of forward to reflected power. Here's a simple VSWR calculator. Note: If you select a waveguide size from the dropdown below, the broad wall width will be automatically calculated along with the other results. 5 0 0. 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. 8ghz. Upon arriving back at the source, part of the reflected wave is coupled back. . A network analyzer can be used to make S parameter measurements. Therefore, a VSWR of less than 1. e. 43. Where, RL = Return loss in dB. 155 dB. 4. 15. Z (impedance, complex number, in ohms), here are 2 examples of Z: Zs = Rs + jXs, source impedance. RL = 20 * log10 ( (VSWR + 1) /. 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. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch loss. By Marki Microwave, Posted Wed May 19 2010. Fairview Microwave's Waveguide Calculator provides the cutoff frequency, operating frequency range and closest waveguide size for a rectangular waveguide based on the custom inputted broad wall width. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). If our directional coupler had perfect isolation, the return loss of the load would equal the difference between the reflected and forward measurements:. Pasternack's RF Calculators and Conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. In Excel this can be done using the max function such as "=max(0. Figure 6. Vswr To Rl Formula. return loss Calculator. 1 Return loss in dB = 26. You can use it for free. Recall that signs of reactances are missing on the full chart. long or about 1. A power meter may also be used to calculate cable loss. 2. Interactive Tools & Calculators. 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. 333, a mismatch loss of 0. RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. The Insertion Loss formula is defined as the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels (dB) and is represented as I L = 20* log10 (V t / V in) or Insertion Loss = 20* log10 (Voltage / Input Signal Amplitude). Formally, S11 is the negative of return loss and has. 5 0. Pasternack's TEM (Transverse Electromagnetic Mode) Wavelength Calculator allows you to determine the wavelength (in millimeters) inside a rectangular waveguide given the frequency and dielectric constant (or VoP) of the input signal. Definition of VSWR. Dual Dielectric Coax Calculator. 많은 초심자들이 대체 왜 return loss란 지표와 VSWR이란 지표가 혼용되는지 이해하기 어려워 하는 경향이 있다. Free Online. 0 indicates 44% of the power is delivered to the antenna (3. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. A VSWR of 6 or more is pretty high and will generally need to be improved. Follow the discussion. Custom. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. 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 ). VSWR | Return Loss | Reflection Coefficient Conversion Calculator: This Javascript calculator converts between return loss (RL), voltage standing wave ration (VSWR),. vswr-rl変換する計算ツールです。 イノベーションtop; 研究開発の実績; 博士の電波講座; アンテナ作りのこだわりMatchCalc™ RF Design Calculator. , some amount of incident power will reflect the source in a practical system). Any other value indicates that a portion of the energy is reflected. 9913 and LMR-400 are popular “low-loss” RG-8 types. 0 0. Do y. Using complex impedance is an important technique for handling multi-component AC circuits. VSWR (Voltage Standing Wave Ratio) is a measurement of how well matched a radio transmitter and transmission line is to a load such as an antenna. Now let's look at the response. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). 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. It can be calculated as: In the above formula, G is the reflection coefficient and can be calculated using the following formula: For the circuit in Figure 6, we calculate VSWR to be:Thus, for this system, VSWR = 1:1 (i. Matching Pi Attenuator Calculator. 8. In this Inside Wireless episode we will look at Voltage Standing Wave Ratio (VSWR), |S11|, and Return Loss. For example, an efficiency of 0. Telegram. Clear. When creating PCB prototypes that conduct alternating current (AC) at radio frequency, designs must compensate for the effects of the current waves on the prototype material. Reactance Calculator. Note: The historical definition of return loss results in a negative sign. 079 29. 6 dB of mismatch loss). These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). Visit Fairview Microwave's RF coaxial attenuators page for product details. Return Loss VSWR Reflection. R = 20log 10 (E incident /E reflected)Let’s end our discussion with a table of reflection VSWR, refection coefficient and return loss values (and remember that our VSWR calculator can provide any values you need). As an added bonus, the results are modifiable and can calculate. RETURN RETURN RETURN RETURN RETURN LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. offices email call. Forward Power (W) Reverse Power (W) VSWR. The relation between return loss, VSWR, and the reflection coefficient provides a comprehensive view of the system's efficiency. Enter the source characteristic impedance and the load impedance then press "Calculate" below. The term ‘forward power is synonymous with powered deliver to the load, or thru power. VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. A table of convenient values are presented at the bottom. ,100 % power transferred from a source to a load via a transmission line/cable). RL = dB: VSWR =. R/F Calculators and Conversion Tools VSWR / Return Loss Calculator Find VSWR (Voltage Standing Wave Ratio), Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. Follow the discussion. Result: Free Space Path Loss (FSPL) calculations are often used to help predict RF signal strength in an antenna system. VSWR is the ratio of maximum voltage to minimum. VSWR. Voltage standing wave ratio (VSWR), or often given as just standing wave ratio (SWR), is the ratio between the transmitted and reflected voltage standing waves at a signal chain element incident node. This is described in more detail on a separate page. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. 4569. 25mW. See the relationship between VSWR and return loss. Calculate impedance from resistance and reactance in parallel. 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. This is an online calculator that calculates Return Loss based on Reflection Coefficient. 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. Suitable for higher power (~1800 watts) at HF. This mix of web-based tools and downloadable Windows software was developed to help engineers design faster and more accurately. 1. Even so, the math gets tedious in a hurry. VSWR to Return Loss . Return Loss. Subscribe to receive Mini-Circuits News. Our RF calculators and converters will provide the figures you need for your radio frequency engineering needs. Suitable for higher power (~1800 watts) at HF. Suitable for VHF (~1. LC Impedance matching network designer Enter the input and output impedances to be matched and the centre frequency. Wavelength Calculator. 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. 50 Ω adalah standart yang umum untuk aplikasi RF. Pi Attenuator Calculator. 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. How to Calculate VSWR . Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). We have designed a special VSWR and Return Loss Calculator. They are related but measure different aspects of signal performance. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. 29:1 VSWR Is this correct? If so, performing the same analysis in the reverse order (with respect to the power meter), gives me: RL for the system (wrt to the power meter) = 19. VSWR specs (specifications) are introduced, along with formulas for mismatch loss and return loss in relationship to VSWR. This is an ideal open or short circuit, equivalent to VSWR=infinite. If the antenna reflects 250 watts the VSWR at the antenna will be 1. Now let's look at the response. e. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. WhatsApp. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch loss. 41:1 with a return loss of 15. Same-day shipping if you order in the next hours!. Useful converters and calculators Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). The Tee attenuator (T-pad) is a specific type of attenuator circuit which resembles the shape of the letter "T". 54dB. return loss Calculator (by using VSWR) Skin. It turns out that -13. 13 24. Given a certain level of heat generation within an assembly, thermal dissipation occurs through three primary mechanisms. Requires Windows 7 (64 Bit) or higher. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and. Solved Example. 0. RF Works is unable to take liability for. This paper further validates this equation against experimental data obtained for. These multiple solutions are possible because each contributor is a vector having both. e. 11 1. Understanding VSWR and Return Loss. , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. 12] = 6 dB. The two DTF graphs are the same except for the return loss value at marker 1. 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. 005 Γ 0 0, 1 01 VSWR 1 0and RL 40 dB, which is difficult to achieve in reality. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. For support with the MatchCalc tool, contact tool-feedback@qorvo. Advanced Control Components Inc HUBER+SUHNER AG Wellshow Technology Omega Electronics : Most Viewed Articles 6-26. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. For one example, if. As we have seen, besides of the load impedance, this method measures also the real power delivered to the load. 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. Keep in mind that some calculators for RF have hard-coded units; if the label says (nF), for example. Convert VSWR to Return Loss and vice versa. 405 inch. VSWR is the ratio of the peak amplitude of a standing wave to the minimum amplitude of a standing wave, as seen in the following Figure: Figure 1. Return loss can be measured by using microwave and RF test equipment such as a signal generator, directional coupler along with a spectrum analyser or power meter, or alternatively by using a. The Smith Chart graphically maps S11=reflection coefficient= (ZL-Z0)/ (ZL+Z0) to Load Impedance (ZL), normalized to Z0 (source impedance = center of chart). A high. VRMSF and VRMSR are measured and the return loss is back calculated. 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. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and mismatch loss (ML) is calculated by using following formulas. VSWR is another way of measuring signal reflections. 0 Return Loss / VSWR. From a system VSWR level calculate the following parameters:- Reflection coefficient- Forward and reflected power percentage- Mismatch loss in dB. Upon arriving back at the source, part of the reflected wave is coupled back. 44 . Using our 1 foot equals one nanosecond rule of thumb, let's calculate the 0. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. Formulas used: s r r. 1) (2. Formula Voltage standing wave ratio is equals to one plus toue (Γ) is reciprocal of one minus toue (Γ) Toue (Γ) is equals to Voltage standing wave ratio minus one reciprocal of. S-parameters, S11 and S21. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. 5:1. VSWR, 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. Calculate VSWR and Return Loss from Zload (or Yload or S11) and Zo; Calculate Vmax, Vmin, Imax, Imin for lossless line from Zload (or Yload) and Zo; Calculate transmission line Matched Line Loss from Rin of o/c or s/c resonant section; Calculate luminous flux (lm) from luminous intensity (cd) and apex angle (°) Calculate irradiance flux (W/m^2. 009. Forward Power (dBm)Skin depth calculator Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. VSWR. 14 dB per hundred feet. LC Impedance matching network designer Enter the input and output impedances to be matched and the centre frequency. 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). The main cause of the mismatch is the deviation in the con-Ο υπολογιστής vswr σε rl χρησιμοποιεί αυτόν τον τύπο για να μετατρέψει τις τιμές vswr σε τιμές rl. 92 dB 0. 40) a common limit for sweeps with an antenna at the far end. The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. Voltage Measured Along a Transmission Line. 356. 4. 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. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. A power meter may also be used to calculate cable loss. If there is something in the microwave universe that you need a different calculator for, drop us a note and we'll see what we. 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. 000:Return Loss (RL) and Voltage Standing Wave Ratio (VSWR) are related through a mathematical relationship. 091) (0. From Rho, calculate VSWR= (1+Rho) / (1- Rho). e. Return Loss is the amount of power that is lost in the signal returned/reflected by a discontinuity in a transmission line. Return Loss = incident power/ reflected power. The VSWR to RL Calculator employs this formula to convert VSWR values into RL values. Figure 13.