Consumers; Contact Us;Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . 6 dB of mismatch loss). VSWR is determined from the voltage measured along a transmission line leading to an antenna. 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. VSWR to Return Loss Reference/Conversion Table. Definition and BackgroundVSWR return loss calculator The voltage standing wave ratio (VSWR), reflection coefficient (Τ), return loss and mismatch loss are all dependant on one or the other, as can be seen by the equations below. 155 dB. 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. For this type application, Simple slope and offset correction coefficients for the RL measurement are. 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. The MAX2016 is a dual logarithmic detector/controller used to monitor the VSWR/return loss of an. It turns out that -13. This attenuation calculator provides as output to the user the. used to calculate the various values of impedances, voltages, currents, and SWR values that exist in the operation of a par-ticular transmission line. This trace would typically be accepted as good. How to Calculate VSWR . VSWR. 5. Calculate the VSWR in another column. . 13 24. Low-pass lumped element filters. Understanding VSWR and Return Loss. 5 dB, (or a VSWR of 1. VSWR. Now, let us investigate the physical meaning of return loss. 1. 1 Return loss in dB = 26. Note that in general S-parameters are a function of frequency (i. cdn-anritsu. VSWR to Return Loss Conversion Table. This bounce back reflection is called “return”. 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. 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. Since directivity is a ratio of power densities, it is unitless. The concept behind the Smith Chart is simple. For example, an efficiency of 0. 211 0. 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. A VSWR of 6 or more is pretty high and will generally need to be improved. Visit Return Loss to VSWR converter>> RF Calculator #5 :Effects of Cable Loss in VSWR and Return Loss Measurements By Jim Norton Bird Technologies Group Applications Engineer 1 | Bird Technologies Group 866. 2 means a peak voltage 1. 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. A similar version of this article appeared in the October 2012 issue of Power Systems Design magazine. reflected energy. VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. RF Trap With Attenuator Calculator Calculates the attenuation, 'impedance', reflection coefficient, VSWR and return loss of a circuit that incorporates a RF tank circuit into a Pi attenuator. Step 4. R = 10log 10 (P incident /P reflected) and. 405 inch. 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. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. 0 0. 14 dB per hundred feet. The VSWR is a measure of the efficiency of a transmission line and is used to determine how well the line is matched to the impedance of the. Facebook. Click here for RL to VSWR CalculatorKnowing Return Loss (RL), calculate voltage reflection coefficient Rho= 10^(-RL/20). You can use our VSWR calculator to see that 1. 8 is 80%, or -0. 12] = 6 dB. 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. net I(RL) V1. 045 foot x 12 inches/foot x 1000 mils/inch=540 mils. The calculated value is MUCH worse. . By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. so, for instance “. Definition of VSWR. VSWR is commonly expressed as a ratio. VSWR to Return Loss Conversion Table. Note that we have a VSWR calculator that will allow you to convert between VSWR, mismatch loss and return loss!. All our transmitters above 50W feature a simple Forward and Reflected power meter on the front panel. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. 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. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. 0. Reflection -10dB: 1/10 th of the RF energy is being reflected. Since it is a logarithmic measurement, it is very useful when displaying very small reflections. The ideal condition, whereYou can assume power dissipation to be uniform, provided the assembly does not operate in high VSWR/return-loss conditions. 97dB. 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. VSWR / Return Loss Calculator: IRA Calculator: Wavelength (TEM) Calculator: Link Budget Calculator **Note: All of our radio frequency calculators allow SI prefix input. Return Loss or a VSWR: return loss (dB) (evaluated as neg. But the meter at the transmitter will show a VSWR of 1. Knowing the VSWR value allows engineers to determine the amount of signal loss that occurs due to reflection and calculate the return loss for the system. 045 foot length of this part in smaller units: 0. offices email call. 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:. Use the S11 value in the calculator above to find the equivalent VSWR. Consumers; Contact Us;A network analyzer can be used to make S parameter measurements. Pout is the output power or signal level. The VSWR can then be calculated from the return loss (RL) with the following equation. 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. This paper further validates this equation against experimental data obtained for. 11 1. Avg. 005 Γ 0 0, 1 01 VSWR 1 0and RL 40 dB, which is difficult to achieve in reality. 98 dB return loss. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. To convert from Return Loss to VSWR, find the return loss value in the left column. dBm to Milli Watts Calculator. p65 Author: barbara Created Date: 5/6/2003 8:50:18 AMThe voltage standing wave ratio (VSWR) at a port, represented by the lower case 's', is a similar measure of port match to return loss but is a scalar linear quantity, the ratio of the standing wave maximum voltage to the standing wave minimum voltage. Return loss is when the transmitted signal is not completely. , thereby assisting engineers to detect system problems and avoid costly, time-consuming system failures. Yoni Calculator Online Test System Configurator ezSample. 12] = 6 dB. - Applied attenuation. Where, RL = Return loss in dB. It is often expressed in terms of a percentage, or in dB. dl. Return Loss and Mismatch Loss Calculator Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. Vswr To Rl Formula. Even so, the math gets tedious in a hurry. 0 0. As an example, input power of 100 W (50 dBm) and output of 50 W (47 dBm) yields a cable. The two DTF graphs are the same except for the return loss value at marker 1. As an exercise read off the reflection. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. 224 X=-14. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. 4ghz. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. 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. 7. The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. S22 would be the reflected power radio 2 is attempting to deliver to antenna 2. Return Loss (dB) = 10 x Log ( Pr / Pf ) Match Efficiency (%) = 100% x (1 - Pr / Pf)The VNAs with math modes can also directly calculate and display the resulting VSWR value. VSWR Calculator. Understanding those basic parameters. Step 3. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. e. VSWR table of 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. 5 10. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch loss. Convert the VSWR value to a ratio by subtracting 1 from the VSWR value. Electric fieldrms 5 conductivity 1 mass density 13E03 13 x 10 3. Definition of VSWR. A power meter may also be used to calculate cable loss. Radio Frequency Engineering Calculator. The image below shows what your completed Excel sheet might look like. 695. 672 0. Forward Power Watts ? Reflected Power Watts ? VSWR → RL (Return Loss). Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. Complex Impedance for RL and RC. Because the reflection coefficient Γ < 1, then the return loss will have a positive dB value. Select the FREQ-RETURN LOSS using the Up/Down arrow key and press ENTER. For this new launch, both Lou Meyer and Erik Lilieholm have been essential for the tool to be RF-solid. reflection coefficient Calculator. Reflection -3dB: half of the RF energy is being reflected, and thus half of the energy is being received by the device. Unequal-split Power Divider Calculator. 1 Return Loss. 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 application note supplies a free of charge software tool that can e. VSWR measures the ratio of voltage peaks and valleys. VSWR to Return Loss . 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. Solution: First the VSWR figures are converted to reflection coefficient magnitudes: Then the mismatch uncertainty is: M u = ±200 (0. The term ‘forward power is synonymous with powered deliver to the load, or thru power. voltage standing wave ratio. 3 1700–2200 MHz 1. 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. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. (3) ea 90°E-Bend - 1. Despite Equation [Math Processing Error] 10. Here's the unwrapped phase of S21:by Eamon Nash Download PDF. Same-day shipping if you order in the next hours!. 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). The VSWR to RL Calculator employs this formula to convert VSWR values into RL values. For VSWR=2, reflection coefficient will be=1/3 and 20log(1/3) =-9. Return Loss Vs. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR = Reflection Coefficient = Follow the discussion. 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. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. Title: dg03-110. You can use it for free. In this Inside Wireless episode we will look at Voltage Standing Wave Ratio (VSWR), |S11|, and Return Loss. 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. —and calculates both the typical system return loss along with the worst case return loss. 3. ANSOFT CORPORATION HFSS FIELD CALCULATOR COOKBOOK INTRODUCTION feature of Ansoft’s HFSS Version 7. VSWR Calculator:(by using RL) return loss(RL)= VSWR = RF Coax Cable Assembly Designer: Most Viewed Companies MegaPhase, LLC. The corresponding value in the right column is the return loss value. Note: The historical definition of return loss results in a negative sign. This can be built into a FLEXI-BOX and a transmission line PCB is. Return Loss or a VSWR: return loss (dB) (evaluated as neg. Return loss is in dB, and may be a little more intuitive; a VSWR of 2:1 would be a Return Loss of about 10dB, meaning 10% of the incident power to the antenna is being reflected back to the source. 50:1, the resulting maximum VSWR will be 4. Return loss load -2. 098Ω resistor in parallel with a 306. 000:Calculate SWR and return loss from impedance values. Subscribe to receive Mini-Circuits News. VSWR: RL (dB) 1. This mix of web-based tools and downloadable Windows software was developed to help engineers design faster and more accurately. VSWR. 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. 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. 259 0. The reader is encouraged to do this with the full impedance Smith chart as shown in Figure 3. 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. VSWR: RL (dB) 1. Return Loss vs VSWR Calculator: The calculator calculates VSWR from return loss and return loss from VSWR. It varies from 1 to (plus) infinity and is always positive. 5:1 정도로써 입력매칭이 거의 완전하게. These are two different ways to measure the same thing. VSWR is determined from the voltage measured along a transmission line leading to an antenna. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. Next, plug in the calculated return loss value into the formula VSWR = (1 + 10^ (RL/20))/ (1 - 10^ (RL/20)). Measurement and control of gain and reflected power in wireless transmitters are critical auxiliary functions that are often overlooked. To convert from VSWR to Return Loss, find the VSWR value in the left column. The main cause of the mismatch is the deviation in the con-Resonant Frequency Calculator. Return loss vs. 600mW. Measure S11 across the desired frequency range. Directivity, on the other hand, is the level of the signal which appears at Port 4 and is undesired. 0. Individual calibration is generally recommended to account for manufacturing process variation. The calculated value is MUCH worse. RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. This is an online calculator that calculates Return Loss based on VSWR. 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. Pasternack's VSWR/Return Loss Calculator finds VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. The term ‘forward power is synonymous with powered deliver to the load, or thru power. In industry, VSWR is sometimes pronounced "viz-wer". 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). Free Online Engineering Calculator to quickly convert a Voltage Standing Wave Ratio into Mismatch / 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. USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. 15 + 1. 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. VSWR calculator: Isolation between circuit stages (mentioned above) is a way to minimize the voltage standing wave ratio (VSWR) and, in this way, improve impedance matching. 091 25. Forward Power (dBm)Skin depth calculator Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. A series of RF calculators for radio frequency engineers. VSWR (Voltage Standing Wave Ratio) = [1+Sqrt (Pr / Pf)] / [1-Sqrt (Pr / Pf)] Pf = Forward Power (Watts); Pr = Reflected Power. Measure S11 across the desired frequency range. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. A 2-port device has two distinctly interesting. 1. VSWR is the ratio of voltage applied. The following formula is used to calculate the Return Loss (RL) from Voltage Standing Wave Ratio (VSWR). In contrast to Return Loss, VSWR displays the match of the system linearly. Measured forward power vs. Enter a value for VSWR (remember: VSWR should be a number larger than 1. A power meter may also be used to calculate cable loss. Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). Advanced Control Components Inc HUBER+SUHNER AG Wellshow Technology Omega Electronics : Most Viewed Articles 6-26. 1) (2. Conversion Formulas. 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. You can take the readings from. Example 2. , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. Electrical waves reflect when they encounter a change in the impedance of the medium they are traveling in. 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. 많은 초심자들이 대체 왜 return loss란 지표와 VSWR이란 지표가 혼용되는지 이해하기 어려워 하는 경향이 있다. Because of this, the effects of mismatch can be minimized by selecting an attenuator with the lowest possible VSWR. The VNAs with math modes can also directly calculate and display the resulting VSWR value. Click here to use the VSWR Calculator . These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). It measures how much of the signal sent from the antenna is reflected back to the source. VSWR | Return Loss | Reflection Coefficient Conversion Calculator: This Javascript calculator converts between return loss (RL), voltage standing wave ration (VSWR),. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. It's assumed that the source impedance is also complex. 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. Enter the source characteristic impedance and the load impedance then press "Calculate" below. VSWR and Return Loss RF Calculator. 44 . Once the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. 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 −. Any other value indicates that a portion of the energy is reflected. Print - Advertisement - A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line Inputs. Return Loss to VSWR Conversion Chart. To convert from VSWR to Return Loss, find the VSWR value in the left column. , some amount of incident power will reflect the source in a practical system). Πώς να χρησιμοποιήσει; Η χρήση του υπολογιστή vswr σε rl περιλαμβάνει τα ακόλουθα βήματα:Descriptions of IL and RL with examples of how the measurements relate to the ratio of Pout to Pin, and Preflected to PinIn fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. 46 2. While we’re at it, the reflection coefficient is: Γ=(75-50)/(75+50)=0. Let’s start by looking at a 2-port device illustrated in Figure 1. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. Dual Dielectric Coax Calculator. 4. Pi Attenuator Calculator. Calculate. Please note that this. If the antenna reflects 250 watts the VSWR at the antenna will be 1. 0 indicates 44% of the power is delivered to the antenna (3. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. 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. But the meter at the transmitter will show a VSWR of 1. The return loss at that point has degraded by approximately 5 dB. The Tee attenuator (T-pad) is a specific type of attenuator circuit which resembles the shape of the letter "T". 7. Low-pass lumped element filters. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. 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. 504pF. There is a resistive axis that is down the middle of the chart,In no event will Qorvo be liable to any user of these tools for any loss or damages, including without limitation, indirect or consequential damages arising out of or associated with the use of these tools. If the antenna reflects 250 watts the VSWR at the antenna will be 1. 045 foot length of this part in smaller units: 0. 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. Suitable for higher power (~1800 watts) at HF. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). Even if a computerYoni Calculator Online Test System Configurator ezSample. For series combinations of components such as RL and RC combinations, the. 0 is the minimum. Thus with ~ 25% reflected power: Return Loss = -10 x Log [ 100/25. VSWR specs (specifications) are introduced, along with formulas for mismatch loss and return loss in relationship to VSWR. You can also use LTSpice to calculate S-parameters as well, which is a bit of a hidden trick. VSWR table of return loss vs. Z = R + jX, where j is the imaginary component:. VSWR & Return Loss Calculator: Enter forward and reflected power or match to determine equivalent values. The relation between return loss, VSWR, and the reflection coefficient provides a comprehensive view of the system's efficiency. 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. VSWR Return Loss Calculator. VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. 05 VSWR max. LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. 50 from 6 votes. There is also a selection of suitable connectors. 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. 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 ). So a perfect match can be represented by the range 0. A low VSWR will minimize reflections from the antenna. Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. Measure the power levels at the input and output of your cable, convert to units of dBm, and calculate the difference. For example, a VSWR of 1. 8. 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. Return Loss is similar to VSWR and is generally preferred in the cable industry to a VSWR specification. Using complex impedance is an important technique for handling multi-component AC circuits. VSWR / Return Loss Calculator VSWR / Return Loss Calculator Introduction Input Type: Input Value: Calculate Reset Definition of VSWR "Understanding VSWR isn't just about. Useful converters and calculators Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of. Fill in the input field and select the input type and click the "calculate" button to show the values. 98 dB. 1, directivity does not depend on the distance from the antenna. , there is no standing wave). VSWR. Finally, an antenna VSWR monitoring system is shown. Example 2. complimentary copy of the "RF Calculator" at . 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. The VSWR can easily be converted into Return Loss ( RL R L ) using the following formula: RL = 20log10(VSWR + 1 VSWR − 1) R L = 20 log 10 ( V S W R + 1 V S W R − 1) Directional power meter. The limit of transmitter power for cable power dividers is 250 watts. 2. To use this calculator, enter one of the following data: the voltage standing waves ratio VSWR, the return loss RL, the reflection coefficient ρ, the power ratio ρ 2, the forward and reflected power P fwd and P ref; or the impedances Z c and Z l. Mismatch Loss (dB) 3. Enter the source characteristic impedance and the load impedance then press "Calculate" below. And S12 is the power from radio 2 that is delivered through antenna 1 to radio 1. The return loss is the ratio of the power of the. VSWR: RL (dB) 1. 0. The VSWR is an important measure of the quality of a radio antenna system. It is related to return loss as follows.