Vswr return loss calculator. Useful converters and calculatorsAn online calculator for converting between VSWR and Return Loss, Reflection Coefficient, Mismatch Loss, and Reflected Power. Vswr return loss calculator

 
 Useful converters and calculatorsAn online calculator for converting between VSWR and Return Loss, Reflection Coefficient, Mismatch Loss, and Reflected PowerVswr return loss calculator  As an added bonus, the results are modifiable and can

9, for system 2 is 0. Facebook. Now VSWR is 1. LO Tuning Range (MHz) to :Using an oscilloscope to measure R, X, VSWR and power. S-parameters are a valuable tool for calculating reflection coefficients and transmission gains for a two-port network's input and output sides. VSWR table of return loss vs. From a system VSWR level calculate the following parameters:- Reflection coefficient- Forward and reflected power percentage- Mismatch loss in dB. 5. IRA Calculator. 0:1 0 0 1. 15. 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 Loss and Mismatch Loss Calculator. 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. 4) The reflection coefficient is calculated from the characteristic impedance of the transmission line and. Assuming the simplest case where system 1 is a cable with nominally zero loss (cannot be exactly zero with a non-zero reflection), then the reflection loss of the whole system will be somewhere between -8dB. Formally, S11 is the negative of return loss and. It is the ratio between transmitted and reflected waves. 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. As an example, if the return loss of the amplifier is 4 dB, use the calculator below. Assuming the systems have no internal loss. Calculate VSWR, Return Loss, etc. These calculators and. VSWR is a measure of the reflected power on a transmission line. מדריך שלם ל- VSWR מ-FMUSER [עודכן 2022] בתורת האנטנות, VSWR מקוצר מיחס גל עומד מתח. 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. Return Loss is the ration of the reflected signal to the incident signal. Calculate Effective Radiated Power (ERP) With Known Transmission Variables: Transmitter Output Power : W or kW. Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. When the VSWR is known, the return loss can be calculated as: Or in Excel, use the following formula: =20*LOG10 ( (I2-1)/ (I2+1))*-1. Reflected Power. 1, for system 2 is 0. s. The return loss and VSWR measurements are key measurements for anyone making cable and antenna measurements in the field. Cable and antenna analyzers allow operators to measure return loss/VSWR, cable loss, distance-to-fault (DTF) measurements, reflection measurement, antenna isolation measurement, impedance, etc. Enter Forward Power 100. Yoni Calculator Online Test System Configurator ezSample. 58 dB in return loss. The VSWR (Voltage Standing Wave Ratio) to RL (Return Loss) Calculator is an essential tool that helps RF engineers and technicians understand the performance of RF transmission lines and antennas. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. A low VSWR will minimize reflections from the antenna. dBm to Watt: Tool to convert the dBm to Watt unit 3. Manufacturing; Warranty; ANTENNAS . Suitable for VHF (~1. Find VSWR (Voltage Standing Wave Ratio), Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. Antenna efficiency doesn't cover reflected power due. Definition of VSWR. Measure S11 across the desired frequency range. 0:1). VSWR is defined as the ratio of the maximum to minimum voltage on a loss-less transmission line (expressed as 3. Increasing return loss corresponds to lower SWR. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). Figure 1. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. The two VSWRs produce a combined return loss, as follows:. 2:1 (or simply 1. The Smith Chart Pegasus Technologies. Visit Fairview Microwave's RF coaxial attenuators page for product details. Thus with ~ 25% reflected power: Return Loss = -10 x Log [ 100/25. Lumped 2-way Wilkinson Splitter Designer Enter the frequency of operation and system Z0. Channel Emulators/Simulators. 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. It is expressed in dB. Step 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. How to fill out return loss to VSWR: First, calculate the return loss (RL) value using the formula RL = -20*log (VSWR+1). 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. Application Note File. 2 to 12. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR = Reflection Coefficient = Return Loss = dB: Match Efficiency = % Net. This formula is used to calculate the VSWR from the given return loss. The return loss is the ratio of the power of the. 2. Due to reflections, an additional loss of 0. And S12 is the power from radio 2 that is delivered through. 43. Here's a simple VSWR calculator. A match is good if the return loss is high. It's located in our download area . So a return loss of 20dB indicates a reasonably good match. 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. This impedance mismatch can be with a device inserted in the line or with the terminating load. 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. The return loss is the ratio of the power of the. 50:1, with a corresponding return loss of 3. 50:1, the resulting maximum VSWR will be 4. Return loss is when the transmitted signal is not completely. 25mW. 1) RL dB = 10 log P i P r. VSWR. Insertion loss is the amount of energy that a signal loses as it travels along a cable link. VSWR Calculator. Free Online. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. Lumped Quadrature Coupler Designer Enter the frequency of operation and system Z0. 43. everything RF has the big selection of get calculators for the RF and Microwave Industry. 600mW. S22 would be the reflected power radio 2 is attempting to deliver to antenna 2. 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]. Email. You can calculate return loss when the VSWR is known. 333, a mismatch loss of 0. VSWR = Voltage standing wave ratio. Pressing the ‘Calculate’ button with no inputs will load the example below. The result is an antenna VSWR or return loss measurement corrected for cable loss. 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. In practice, the generally accepted frequency band limits for rectangular waveguide are between 125% and 189% of the lower cutoff frequency, in this case 8. 1:1 5 0. $ = \Gamma^2 = 10^{-RL/10}$ Power transmitted ratio for system 1 is 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. (also called insertion loss). With this equation, you can plug in the value of D and the measured voltages, and finally solve the above. Add to My Products Lists. The return loss is a convenient parameter to use when the value of Γ becomes small. Select the FREQ-RETURN LOSS using the Up/Down arrow key and press ENTER. 009. 859 dB or a minimum loss of 1. return loss Calculator:(by using VSWR) Formula is:: VSWR= return loss = VSWR Calculator: This is the ratio of maximum voltage to minimum voltage in standing wave pattern. 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. Return Loss to VSWR. Some of its key features are; displays insertion loss/gain of S1P and S2P files, real-time optimization and tuning. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1]. g. 39 0. Step 2. 02 dB. VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). Measure the magnitude of the wave voltages at the coupled and isolated ports. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . 70cm 35W Fm mobile, 3. 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. Do y. 8ghz. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. 3)" data is theoretical loss for an air spaced copper line of similar dimensions to ladder line and will return loss figures a little better than dry ladder line. Return loss is the fiber optic light gets reflected back at the connection point. The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. be used to add or subtract an arbitrary number of power, to convert power and voltage units from the linear to the logarithmic. Consider the antenna being used in transmit mode. 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. How to improve the Return Loss of an amplifier. It varies from 1 to (plus) infinity. 17. Calculate SWR and return loss from impedance values. 0 Return Loss / VSWR. Γ = Reflection coefficient. PI Attenuator Calculator. The return loss calculator provides quick conversions from among VSWR, return loss, and reflection coefficient. It converts the following units: • VSWR • Reflection • Return Loss • Prefl (Power reflection) • Reflections, Reflectionl to Mismatch Uncertainty Enter a value in any field, and all the other values are calculated and displayed. VTX Power in mW. 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. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. VSWR to Return Loss. 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. 2. The view of any reflected voltage wave alone so see the reactive part would need the reflected current to plot the ratio, so it is not used. 8ghz. —and calculates both the typical system return loss along with the worst case return loss. This calculator is designed to model the common configuration where a transmitter which is designed for a particular load impedance, is connected to a an antenna of that impedance, over transmission line of the same. As an added bonus, the results are modifiable and can. N = current stage. Print - Advertisement - A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line Inputs. Matching Pi Attenuator Calculator. In one typical RF application, VSWR is. 0. The graph below shows input return loss for an amplifier. By Marki Microwave, Posted Wed May 19 2010. vswr Excel calculator. Return Loss or a VSWR. The resonance calculator, based on user-supplied values of inductance (in nH) and capacitance (in pF), calculates a resonance frequency (in GHz) for the combination of electrical values. Now, let us investigate the physical meaning of return loss. Return Loss is similar to VSWR and is generally preferred in the cable industry to a VSWR. The formula for mismatch loss is simply: mismatch loss= (1-|Γ| 2) alternatively, mismatch loss=1-ρ 2. 1. The reflection coefficient is also known as s11 or return loss. The following table provides conversions for wavelength (from frequency), VSWR (from forward and reflected power). 5. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. Your26 (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. VSWR calculator. Understand the applications for the equation of VSWR on return loss in electronics. The usual function of a transmission line is to convey power from a source to a load with minimal loss. 2. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. This collection of RF and Power Management design tools reflects Qorvo's commitment to the engineering community. Calculate. Note: The historical definition of return loss results in a negative sign. This is the most efficient scenario. Because of this, the effects of mismatch can be minimized by selecting an attenuator with the lowest possible VSWR. Learn about voltage standing wave ratio (VSWR), return loss, and mismatch loss, which helps characterize the wave reflections in a radio frequency (RF) design. Preferred resistor values are entered into the text boxes, similar to the way that values for a prototype may be selected. This table is particularly useful when designing antenna systems. The Reflection Coefficient can be calculated from return loss by using the following formula. In logarithmic terms, the formula for return loss is given as: Even if the measured reflection value on the VNA is -25dB, the negative sign is ignored when representing return loss. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. Γ = (VSWR – 1)/(VSWR + 1) Return Loss (dB) = -20*Log 10 (|Γ|) Mismatch Loss (dB) = -10*Log 10 (1. The ratio of the maximum to minimum voltage is known as VSWR, or Voltage Standing Wave Ratio. 54 dB (11% of your transmitter power is reflected back). VSWR & Return Loss Calculator Enter forward and reflected power or match to determine equivalent values. Friis Transmission Calculator. Return Loss (dB) to VSWR Calculator. 5:1 정도로써 입력매칭이 거의 완전하게. Return loss is related to both standing wave ratio (SWR) and reflection coef-ficient (Γ). 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. Wavelength. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. This online reflection coefficient to VSWR calculator calculates the VSWR by entering the reflection efficient Γ (= value between 0 & 1). 2. Expressed as 3. 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. Enter the return loss, VSWR or reflection coefficient using drop-down menu to calculate how much power is reflected from or delivered to the load and mismatch loss. VSWR (Voltage Standing Wave Ratio) is a measurement of how well matched a radio transmitter and transmission line is to a load. Return Loss is the amount of power that is lost in the signal returned/reflected by a discontinuity in a transmission line. VSWR. 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. Return loss vs. Enter. The first reflection back from each system will be the largest and subsequent reflections will be heavily attenuated, so we. In this case, you may also need to calculate localized heating due to a current standing wave. 39 0. Bernard Sklar, Communications Engineer and author. 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. Voltage standing wave ratio (VSWR)A calculator designed to compute the VSWR,return loss and matching loss in a transmission line. Poor VSWR can cause shadowing in a TV broa1) VSWR Calculation. As an added bonus, the results are modifiable and can calculate the other values. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common. Custom. For VSWR=2, reflection coefficient will be=1/3 and 20log (1/3) =-9. A VSWR of 1:1 means that there is no power being reflected back to the source. 868. But for a practical transmission system with load, there will be a small impedance mismatch that will lead to a small amount of incident power reflected back to the source. 1) RL dB = 10 log P i P r. 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. Return Loss is a amount of power that is lost to the load and does not return in to the system as a reflection. VSWR Return Loss Calculator VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. Alternatively, Generate R1 and R2 for a wanted attenuation. Return Loss and Mismatch Loss Calculator Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. 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. Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. , some amount of incident power will reflect the source in a practical system). In some systems this is not a trivial amount and points to the need for components with low VSWR. This calculator is specific to the circuit used in the RF Trap With Attenuators FLEXI-BOX. 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. Noise Conversion Calculator. 00Watts Enter 1. 7. Suitable for higher power (~1800 watts) at HF. Any other value indicates that a portion of the energy is reflected. This is an online calculator that calculates Return Loss based on Reflection Coefficient. 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. 0 or the results don't mean anything!). Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Both these parameters are used to find a match between a source and load of a system. VSWR Calculator The VSWR Calculator is a program for reflection unit conversion. The return loss at the input and output ports can be calculated from the reflection coefficient, S11 or S22, as follows: RLIN = 20log10|S11| dB (Eq. There are two S-parameters of interest. To calculate VSWR for this interface, simply take the ratio of the largest standing wave to the smallest standing wave. coefficient of Port 1 (also called return loss), and. 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. 5), which will give us 6. 0:1). Marki Microwave's Tools is a collection of free online applications for RF analysis and synthesis that are easy to use and mobile-friendly. ERP, Line Loss and Various Calculators, Antenna Voltage and Current and Feedline Voltage and Current. 557 GHz. 891: 6. Conversion Formulas. In this context, the term S-parameters or. 3. 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). spacing could be found. Title:. 54dB. VSWR (voltage. The component is said to have a loss of 25 dB. As part of Qorvo’s commitment to the engineering community, we are providing this collection of RF design tools to assist engineers. 43 20. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1] Return Loss on Wikipedia The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. 57. This can be built into a FLEXI-BOX and a transmission line PCB is available which easily adapts for this circuit with a simple trimming operation. 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. 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. 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. 405 inch. 72 0. main article I used several examples of SWR based on a resistive load. At 100 MHz, the loss is 0. 0:1, 2. 866. VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. 041:1 There is a large list of web based VSWR - return loss - reflection coefficient calculators available real-time via the here to go go to our main page on VSWR We offer an Excel spreadsheet that will help you visualize how voltage standing waves are created. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). VSWR Calculator. Reflection Calculator: RL = dB: VSWR = Γ = VSWR = RL = dB: Γ = Zo . 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. It varies from 1 to (plus) infinity. Example 2. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. 1 Return Loss. 1 Return Loss. 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. 09 = 1. g. 92 dB 0. 891: 6. Return loss can be measured by using microwave and RF test. The method generally makes sense in that the return loss, or VSWR, performance of each element in a transmission system additively degrades the system return loss. 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. Given a certain level of heat generation within an assembly, thermal dissipation occurs through three primary mechanisms. g. 12:1, which is. VSWR = Voltage standing wave ratio. October 20. 707. Return loss vs. Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. Measurement and control of gain and reflected power in wireless transmitters are critical auxiliary functions that are often overlooked. 3. VSWR-to-Return Loss CalculatorRF Calculators. 01. Select operating frequency. (19/1. Custom. Mixer Spur Search Calculate a list of mixer spurious responses for a set frequency plan. Select a Choice*. 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. This impedance mismatch can be with a device inserted in the line or with the terminating load. Return Loss. Return Loss vs VSWR Calculator: The calculator calculates VSWR from return loss and return loss from VSWR. Therefore, the return loss parameter RL can only be used to express the mismatch of R L to Z 0. Any other value indicates that a portion of the energy is reflected. 954 dB is possible. We can then find the return loss as -20 * log(0. Useful converters and calculatorsAn online calculator for converting between VSWR and Return Loss, Reflection Coefficient, Mismatch Loss, and Reflected Power. 500 1 Enter Reflected Power 4. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. 5:1 VSWR is equivalent to -13. 9913 and LMR-400 are popular “low-loss” RG-8 types. 6 Adding VSWR to the MixRG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. 200mW. Return lossHome / Blog Posts / VSWR, Return Loss, Insertion/Transmission loss vs. The concept of loss factor is discussed on this page. The following formula relates the return loss and VSWR. 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. 2. For example, if you wish to input "25000000", just type "25M" instead. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. 8. *Strictly, a loss quantity when expressed in dB should be positive. Qorvo Interactive Tools & Calculators. 7145 VSWR 6 Directivit y of directiona l coupler 23 dB 0. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. As an added bonus, the results are modifiable and can calculate the other values. 01:1 to 3. Use the S11 value in the calculator above to find the equivalent VSWR. Matching Pi Attenuator Calculator. Effective Radiated Power and Coax Loss Calculator. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . Two wire line Two wire line calculator, Twin Lead cable: VSWR calculator v = 1 / √ E r (where E r is the diëlectric constant of the medium), for air E r is +/- 1: VSWR - return loss - reflection coefficient vonversions between VSWR - return loss - reflection coefficientVoltage Standing Wave Ratio (VSWR) is defined as the ratio of the maximum to the minimum voltage on a loss-less line. Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). 200mW. This can an online calculator that estimates VSWR based on Return Loss. Output Return Loss Var3. spacing could be found. The path loss that might be measured in a system however will not be this.