Return Loss and Mismatch Loss Calculator. This makes it a more direct measure of reflections than VSWR. Any other value indicates that a portion of the energy is reflected. 98 dB is equal to the equaivalent return loss of 1. To help the engineers conducting VSWR sweeps, Lou developed the PIM and. 21b) VSWR = 1/(q + p), where q = 0. 0. They are related but measure different aspects of signal performance. Just enter the value and please calculating. ☯ Return Loss=20log 10 (VSWR+1/VSWR-1) (dB)A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission lineIt is the ratio between transmitted and reflected waves. 707. 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. VSWR (voltage standing wave ratio, sometimes pronounced "viswar"), is the ratio of the maximum standing wave amplitude at one node to the minimum. If problems show up during this test, there is a very good. The VSWR monitoring system consists of an ADC for real-time measurements. Pout is the output power or signal level. 0 dBFor our measurements we replace the antenna with a 50 ohm termination (vswr 1. This is an ideal situation that rarely, if ever, is seen. 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. With the initial values in place, you need only click on Calculate. 62 GHz, and the measured return loss for the fabricated antenna was −19. 5 (-14. Then click the "Calculate" button next to the value you just typed to compute the others. Consider the antenna being used in transmit mode. 64/100) = ±0. The calculator is designed to be fine tuned after the initial input. Here Click here to learn more about VSWR. The VSWR value range from 1. 어쨌거나 중요한건 둘다 자주 사용되는 반사지표이기 때문에, RF로. Return Loss in dB What It Means VSWR Number; 0 dB: 100% reflection, no power into the antenna, all reflected back: Infinite: 1 dB: 80% reflection, 20% power into the antenna: 17: 2 dB: 63% reflection, 37% power into the antenna: 9:The Reflectometer Calculatorallows engineers to input any one of three known values, (Reflection Coefficient (p), VSWR or Return Loss), to . narrowband components) should provide a system worst case of 18dB return loss. 0:1,. 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. 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. This formula is used to calculate the VSWR from the given return loss. 979Return Loss (dB) Calculates Return Loss -13. Lower VSWR means lower reflection power (good impedance matching); thus, power transfers to load will be high. Return Loss (dB) VSWR. Equitable enter the value and click calculate. It is expressed in dB. It is often expressed in terms of a percentage, or in dB. 1) Enter the required input and output impedance and the required attenuation then press "Calculate" below to obtain the Ideal. Return loss is the ratio between the reflected power and input power: $$ mathrm{RL}=frac{P_{ref}}{P_{in}} $$ If the input signal is 0 dBm and there is 25 dB return loss, then the component will create a reflected wave of -25 dBm back toward the. 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. Determine how to calculate the effect of VSWR on Return Loss Understand the applications for the equation of VSWR on return loss in electronics 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. This calculator is specific to the circuit used in the RF Trap With Attenuators FLEXI-BOX. 79. For. entirety RF has the largest selection of online calculators for the RF and Microwave Industry. 99 $ = 1-Gamma^2$. Return loss decibel is mostly read by the the antenna analyzer test equipment. Calculators. Just entry the appreciate and click calculate. You calculate return loss using the reflection coefficient, which measures the ratio of the reflected wave to the incident wave at a given point in the transmission system. Reflected power ratio for system 1 is 0. VSWR and Return Loss RF Calculator. Calculate Reset . Now VSWR is 1. Avg. Requires Windows 7 (64 Bit) or higher. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. VSWR and Return Loss Calculations. Unused stages should be zeroed. As an added bonus, the results are modifiable and can calculate the other values. Formula. 1. This is an online desktop that calculations Return Losing based on VSWR. For VSWR=2, reflection coefficient will be=1/3 and 20log (1/3) =-9. 00Watts Enter 1. . Other components in a transmission line system contribute to small reflections of the RF power. Just enter the value and click calculate. In one typical RF application, VSWR is used to measure the amount of reflection due to impedance mismatch. voltage standing wave ratio. Usually this is the threshold when most devices are considered. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. 1. VSWR to Return Loss Calculator; Cavity Resonance Frequency Calculator; Circular Waveguide Calculator; Rectangular Waveguide Cut-off Frequency Calculator; All Conversion Calculators . 64% or ±10 x log10 (103. Reflection -3dB: half of the RF energy is being reflected, and thus half of the energy is being received by the device. Convert VSWR to Return Loss and vice versa. Just enter the value and click calculate. 2%) = ±3. 2:1 (or simply 1. It is specified in dB. There is also a selection of suitable connectors. Calculate. In contrast to Return Loss, VSWR displays the match of the system linearly. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. The days of searching through desk drawers for your old HP Slide-chart tool are finally a thing of the past with the launch of MDL’s newest tool online – the Reflectometer Calculator(as shown. Increasing return loss corresponds to lower SWR. The input to the antenna will be 8,511 watts. 6dB. VSWR. Home Return Loss to VSWR Conversion Chart Due to mismatches in impedance within the connector, some of the signal is reflected. Γ = Reflection coefficient. Visit Return Loss to VSWR converter>> RF Calculator #5 :Understanding VSWR and Insertion Loss Plots; Understanding Crosstalk and Isolation Plots; 40-870 And 40-830 Series RF Architectures; Calibrating RF Modules with Souriau Connector; Solid State RF Switching to 6GHz; RF Level Conversion; VSWR Interaction; VSWR to Return Loss; Power Loss Due to VSWR of Series SwitchesB at a level of -32 dBm. 1 Return loss in dB = 26. Note that it blows up at the lower cutoff frequency of 6. The definition of return loss is: For a linear, passive interconnect, the power returned, or reflected, will ALWAYS be smaller than the power incident. In an RF system, when power is sent from the source to load, there are three main parameters to be considered: (1) incident power. function doValidate_3 form { window[ cff_enabling_form ] = functi. High return loss means low reflected power, so high return loss is good for a system. 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. 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. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. It provides a measure of how efficiently RF power is transmitted from a power source, through a transmission line, to a load such as an antenna. These reflections are very undesirable when we aim to transfer power from one. everything RF has an largest selection of wired calculators for. 1 and VSWR = 5, which yields the required value p = (1 – 5q)/5 = 0. Formally, S11 is the negative of return loss and. 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. VSWR table of return loss vs. VSWR to Return loss calculator. 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. Reflection Calculator: RL = dB: VSWR = Γ = VSWR = RL = dB: Γ = Zo . This is a measurement of how much energy is either radiated or is dissipated in heat, due to resistive or dielectric losses. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). Return loss is always expressed in dB, which is a logarithmic scale. As an added bonus, the. The return loss is the ratio of the power of the. 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:. 0 or the results don't mean anything!). 41:1 with a return loss of 15. 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. Installer for the Windows version of dB Calculator. Source Return Loss Var1. Return loss quantifies the amount of reflected power, while insertion loss quantifies the loss of power as it passes through the component or device. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. Both traces simply need to be set to take their data from the S11 Reflected Channel. Output Return Loss Var3. The measure of this reflected power is called as return loss. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1] Return Loss on Wikipedia Conversion Tables. 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. See the relationship between VSWR and return loss. 05:1 it calculates a VSWR of 1. The lowest value of the return loss and VSWR are found as -57. All of the power is reflected back. 333, a mismatch loss of 0. Referring to Figure 1 and Example 1 at the introduction of this paper, a 100 W transmitter is connected to a cable and antenna. This is an online calculator is calculates VSWR based on Return Loss. Z L = Ω. Solution: First the VSWR figures are converted to reflection coefficient magnitudes: Then the mismatch uncertainty is: M u = ±200 (0. 2. voltage standing wave ratio 020710. 89% of the power is transmitted forward, while 11% is reflected back into the source. Return Loss or a VSWR: return loss (dB) (evaluated as neg. Always expressed as a ratio to unity, a VSWR of 1. Please check for yourself using appropriate formula. Calculation Select input type: Result: VSWR (pronounced "viswar"), or the Voltage Standing Wave Ratio, is the ratio of the maximum standing wave amplitude at one node to the. 93 dB. 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. This is an online calculator that calculates Return Loss based on VSWR. Products; Applications; New Products; Product Compliance; News & Resources. See the vswr table below to see a numerical mapping between reflected power, s11 and VSWR. At small VSWRs, the plus and minus. reflection coefficient definition. In this Inside Wireless episode we will look at Voltage Standing Wave Ratio (VSWR), |S11|, and Return Loss. everything RF has the largest selection a online calculators for the RF both Microwave Industry. If our directional coupler had perfect isolation, the return loss of the load would equal the difference between the reflected and forward measurements:. Impedance Matching Pi Attenuator Calculator. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. 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. Dieser is an online calculator that calculates Return Hurt based on VSWR. If you only need to convert between GAMMA, VSWR, and dB, you can ignore Zo and ZL. 43. The reflection coefficient is also known as s11 or return loss. everything RF has the big selection of get calculators for the RF and Microwave Industry. 0708,min,max = =This is an online calculator that calculates Return Loss based on VSWR. 091) (0. Therefore, a VSWR of less than 1. Effective Radiated Power and Coax Loss Calculator. Reflection -10dB: 1/10 th of the RF energy is being reflected. $ = \Gamma^2 = 10^{-RL/10}$ Power transmitted ratio for system 1 is 0. 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. So, in your. com +1 (718) 934 4500 +1 (800) 654 7949. 4569. The ratio of the maximum to minimum voltage is known as VSWR, or Voltage Standing Wave Ratio. 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. Enter a value for VSWR (remember: VSWR should be a number larger than 1. It is the major factor contributing to the total signal efficiency of the connector. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. 1) VSWR Calculation. —and calculates both the typical system return loss along with the worst case return loss. Bernard Sklar, Communications Engineer and author. Return loss = -20 * log(Γ) For example, if the VSWR value is 3 : 1, we will first have to find the reflection coefficient's value using it, Γ = 0. Qorvo Interactive Tools & Calculators. If VSWR is known, then the reflection coefficient (Γ), return loss (RL),. The load can be an antenna, filter or other equipment connected to a transmission line. $ = Gamma^2 = 10^{-RL/10}$ Power transmitted ratio for system 1 is 0. How to improve VSWR – a simple technique to reduce mismatch; VSWR to Reflected Power ; Impedance Mismatch Calculator; VSWR from Forward and Reflected. Stage: NF (dB) Gain (dB)0. 0. 1 Return Loss. Step 2. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. RETURN RETURN RETURN RETURN RETURN LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. The directivity would be limited to the corresponding return loss, 14 dB. Just enter the value of source return loss, input return loss, output return loss, load return loss, device gain, and isolation then the calculator will compute the minimum and maximum gain. Mismatch loss is the ratio of power delivered to power available, and is a simple function of reflection coefficient. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. microwaves101. This VSWR / Return Loss calculator allows you to compute corresponding VSWR, Return Loss, Reflection coefficient and Mismatch Loss values for the entered input value and input type. R = 10log 10 (P incident /P reflected) and. -30-25-20-15-10-5 0 0. The graph below shows input return loss for an amplifier. ZoReturn Loss = incident power/ reflected power. Equitable enter the value and click calculate. It also shows the percentage of forward to reflected power. Previous Next. cdn-anritsu. 3333. Reflected Power. 72 0. The formula for mismatch loss is simply: mismatch loss= (1-|Γ| 2) alternatively, mismatch loss=1-ρ 2. As an example, if the return loss of the amplifier is 4 dB, use the calculator below. 4. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. Γ = Reflection coefficient. 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. This attenuation calculator provides as output to the user the original return loss, the improved return loss and final VSWR. It is expressed in dB - A high return loss means more power is lost at the load. Return Loss (dB) 3. We can then find the return loss as -20 * log(0. " – Dr. Formula is:: reflection coefficient (Γ)=. A network analyzer can be used to make S parameter measurements. I'll keep it short: Yes, the computation of: $$Gamma=frac{Z-Z_0}{Z+Z_0}$$ can be properly composed in the way you suggest. With this equation, you can plug in the value of D and the measured voltages, and finally solve the above. , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. be used to add or subtract an arbitrary number of power, to convert power and voltage units from the linear to the logarithmic. 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. This test determines the return loss value of each connector pair, cable component and cable to identify the problem location. sales@minicircuits. Simply enter the value and click calculate. Return Loss to VSWR Conversion Chart. 50 = -13. If “V” is used, then the ratio is defined to voltage level of a standing wave at a line. 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. Return Loss to VSWR. 4. The MCL Microwave Calculator performs 21 calculations commonly needed by RF and microwave system designers in a wide range of applications. As a result, you have a range of either plus or minus uncertainty. The time taken to measure both forward and reverse coupled signals, and calculate return loss is approximately 1. Reflected power ratio for system 1 is 0. Forward Power (W) Reverse Power (W) VSWR. Just enter one value and snap calculate. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Just keep in mind that SWR and Return Loss are both indicators of the quality of the transmission line to antenna feedpoint Z match. The table shows the effects of combining two components in terms of their maximum VSWR and return loss. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of. P%REF = (VSWR - 1)² / (VSWR + 1)² x 100. 0:1). Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. This makes it a more direct measure of reflections than VSWR. This is an online desktop this calcutes VSWR based on Return Net. The Smith Chart Pegasus Technologies. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . VSWR (input) : Return Loss in dB (output): Return loss calculation EXAMPLE : VSWR = 1. 50 from 6 votes. 3 dB. The return loss is the ratio of the power of the. 009. Subscribe to receive Mini-Circuits News. by Eamon Nash Download PDF. 51. Calculate FAQs How do you calculate insertion loss? Insertion loss can be calculated by measuring the power or signal level before and after a component, device,. Path loss calculator Phase Noise to Jitter converter PLL PFD Frequency calculator PLL loop filter calculator Potential divider calculator Propagation time calculator Gamma to Impedance converter Reactance calculator. Return Loss or a VSWR: return loss (dB) (evaluated as neg. For a VSWR of around 5. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. 4 GHz and 5. Return loss is related to both standing wave ratio (SWR) and reflection coef-ficient (Γ). Forward Power (dBm)Return loss tells you how much of the input signal is reflected. VSWR / Return Loss Calculator. Thus with ~ 25% reflected power: Return Loss = -10 x Log [ 100/25. How to Calculate VSWR . The calculator on this page helps determine the loss and that can be factored into the design or RF link budget. As an example, input power of 100 W (50 dBm) and output of 50 W (47 dBm) yields a cable. This tool calculates the Return loss in dB. Γ = (VSWR – 1)/(VSWR + 1) Return Loss (dB) = -20*Log 10 (|Γ|) Mismatch Loss (dB) = -10*Log 10 (1. Particularly, reflected performance and mismatch loss help delineate the need for the antenna (with its matching network) to offer a suitable return loss to the active electrical. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. Expressed as 3. VSWR Calculator. 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. This has an online calculator that calculates VSWR based on Return Loss. It's assumed that the source impedance is also complex. 5:1. G = Gain. Home Pubs. VSWR & Return Loss Calculator: Enter forward and reflected power or match to determine equivalent values. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. 92 dB 0. 5:1 is considered ideal in the RF field, and. Total Cable Assy Loss: (dB) Click link at right to calculate:. 39 0. Cable impedance ohm. The return loss is the proportion of a signal that is reflected as a result of an impedance mismatch. 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. Given a return loss (variable = RL ) in dB, the VSWR is calculated as follows: The magnitude of the reflection coefficient is defined as Rho , where Rho = ( 10 ^ (RL/-20)): e. 1. every RF has one largest selection of online calculators for the RF and Microwave Industry. Select the FREQ-RETURN LOSS using the Up/Down arrow key and press ENTER. 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. Isolation Var6. 8. The voltage standing wave ratio (VSWR) calculator determines reflection coefficient (GAMMA), VSWR, and return loss (dB) for a mismatched line. According to the Andrew design guide, switching our rigid sections to 1. High VSWR values indicate less efficient power transmission and can lead to significant. Click 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. Antenna efficiency doesn't cover reflected power due. 3% of the power back towards the transmitter. There are a number of points to. How to improve the Return Loss of an amplifier. 17. Measurement and control of gain and reflected power in wireless transmitters are critical auxiliary functions that are often overlooked. 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. everything RF has and larges selection from online calculators for an RF plus Microwave Industry. Calculate SWR and return loss from impedance values. 10). VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. In Figure 14, the ADL5920 is being used to measure the return loss of the load, also at 1 GHz. 5:1 정도로써 입력매칭이 거의 완전하게. Measuring Insertion Loss using RETURN LOSS MODE. 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. Select a Choice*. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. Convert VSWR to Return Loss and vice versa. Enter the Noise Figure and gain for each stage. 01. 미스매칭 환산표 ( Return Loss - VSWR ) 고주파 회로에서의 정합성은 Return Loss(반사손실)이나 VSWR(Voltage Standing Wave Ratio, 전압정재파비)로 표시한다. 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. Return Loss to VSWR Calculator. The Reflection Coefficient can be calculated from return loss by using the following formula. Related Blog Posts and Calculators. Just enter an value and click calculate. A high return loss is desirable and results in a lower insertion loss . 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 antenna after this. Primary Sidebar. Use these voltage values and D in the following equation to get the reflection coefficient: Solve this equation for Γ to get the reflection coefficient and VSWR. Furthermore, a small VSWR reduces reflections from the antenna. As the VSWR increases, the quality of the match deteriorates and more power is reflected back. Return loss is a meas-ure of how well devices or lines are matched. 51 dB, and a return loss of 9. 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. 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 measures the ratio of voltage peaks and valleys. everything RF has and largest selection of get home for the RF and Stove Industry. Provided for convenience only. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. 891: 6. Now, assume a "more perfect" termination of 51 ohms was used. The VNAs with math modes can also directly calculate and display the resulting VSWR value. 9, for system 2 is 0. The following equation is especially useful when using a directional power meter. 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. The reflection coefficient is calculated from the VSWR and used to compute the mismatch loss in dB as shown below. 0. This video provides a basic introduction to voltage standing wave ratio (VSWR) and return loss, and explains how these measurements are used in radio frequen. Loss factor. 02 VSWR (i. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR =The VSWR is about 1. A match is good if the return loss is high. Return loss is related to both standing wave ratio (SWR) and reflection coefficient (Γ). Reactance Calculator. Just entered the value or click calculation. AJ4CO Observatory Online Calculator. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch lost. 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. A commonly required conversion is between return loss and VSWR, and some values are tabulated in chart, along with a graph of these values for quick reference. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. Understanding the role and implications of impedance in RF transmission lines and antennas is vital to successful system performance.