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. 79. Particularly, reflected power and mismatch loss help describe the need for the antenna (with its matching network) the provide a suitability return loss the the active electronics. Just entry the appreciate and click calculate. See the vswr table below to see a numerical mapping between reflected power, s11 and VSWR. Return loss vs. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. Reflection Coefficient to Impedance Converter Convert a reflection coefficient in Magnitude Angle format into Impedance and vice versa. Mismatch loss is the ratio of power delivered to power available, and is a simple function of reflection coefficient. 0:1 indicates perfection (there is no standing wave). 0 or the results don't mean anything!). Return loss quantifies the amount of reflected power, while insertion loss quantifies the loss of power as it passes through the component or device. 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. 5115. These multiple solutions are possible because each contributor is a vector having both. Return loss is always expressed in dB, which is a logarithmic scale. The first reflection back from each system will be the largest and subsequent reflections will be heavily attenuated, so we. 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. everything RF has and larges selection from online calculators for an RF plus Microwave Industry. and VSWR can be calculated using the equation: Test Results. The graphical reforms between return-loss, VSWR, reflection index, and mismatch loss. With this calculator, you can calculate the final improved VSWR value when attenuation is inserted between the source and the load impedance that initially do not have a 50 Ohm match. Enter the source characteristic impedance and the load impedance then press "Calculate" below. Isolation Var6. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . It varies from 1 to (plus) infinity. As an added bonus, the results are modifiable and can calculate the other values. Formally, S11 is the negative of return loss and has. 155 dB. The VSWR value range from 1. Cascaded Output IP3: O i P 3 C = 1 1 I P 3 N − 1 ⋅ G N + 1 I P 3 N [ m W] I P 3 C = 10 ⋅ l o g ( I P 3 C) [ d B m] C = cumulative up to and including stage N. VSWR Calculation. 5:1. See full list on allaboutcircuits. How to improve the Return Loss of an amplifier. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). A simple, user-friendly RF / Microwave matching calculator that easily matches S1P and S2P files. What effect does DC current through the main-line have upon performance? A. 8. The loss goes to infinity at the lower cutoff frequency. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. RL = 20 * log10 ( (VSWR + 1) / (VSWR - 1)) RL = 20 ∗ log10( (V S W R + 1)/(V S W R − 1)) Variables: RL is the Return Loss (dB) VSWR is the Voltage Standing Wave Ratio. A VSWR of 1:1 means that there is no power being reflected back to the source. " –. 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. Note, that in this conversion to return loss all phase information is lost. 1, for system 2 is 0. Measured return loss vs. Return Loss (dB) 3. VSWR and impedance, Part 2: Reflected power. A VSWR of 1:1 indicates a perfect match, meaning all power is being efficiently transferred, while higher values suggest mismatches and power loss. Step 2. It's to be noted that this VSWR calculator can also be used in the reverse direction in order to find VSWR if the. You would think this answers the question. Calculates the VSWR, reflection coefficient, return loss & matching loss in a. VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). 0. Calculate VSWR from Forward and Reverse Power. The VSWR is a measure of the matching of the antenna to the source and feeder cables. 5:1 is considered ideal in the RF field, and. In Figure 14, the ADL5920 is being used to measure the return loss of the load, also at 1 GHz. 2 means a peak voltage 1. Loss factor. Return loss load -2. Forward Power Watts ? Reflected Power Watts ? VSWR →. The Reflection Coefficient can be calculated from return loss by using the following formula. It is the major factor contributing to the total signal efficiency of the connector. Many antenna specification sheets list the VSWR and some list the return loss, but many do not. VSWR Monitoring System The MAX2016 is a dual logarithmic detector/controller used to monitor the VSWR/return loss of an antenna, when it is paired with a circulator and attenuator. The following equation is especially useful when using a directional power meter. The VNAs with math modes can also directly calculate and display the resulting VSWR value. This is an online calculator that calculates Return Loss based on Reflection Coefficient. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. 3333. It’s typically expressed in decibels (dB) and calculated as the input power minus the output power. SFDR VisualizerThis VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. Live Calcs Assoc Contact. Measure S11 across the desired frequency range. This is an online calculator is calculates VSWR based on Return Loss. The following formula is used to calculate the Return Loss (RL) from Voltage Standing Wave Ratio (VSWR). The first-factor ohmic loss is an unavoidable loss as it is a property of conductor used for connecting the components and the resistor used. November 2023. Just enter the value and click calculate. Calculate VSWR, Return Loss, etc. Equitable enter the value and click calculate. USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. 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,. A high VSWR indicates poor transmission-line efficiency and reflected energy. Assuming the systems have no internal loss. This ratio can also be measured in dB, and expressed as Return Loss. 868. VSWR to Return Loss. Click here to use the VSWR Calculator. This is equivalent to VSWR 5. **Note: All of our calculators allow SI prefix input. 458:1 in VSWR equals 14. Assuming the systems have no internal loss. For VSWR=2, reflection coefficient will be=1/3 and 20log (1/3) =-9. 2:1 (or simply 1. The value of VSWR = 10 in the previous example is considered to be too high. Both decimal point and comma are ok. Previous Next. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch lost. 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. 8 GHz marks. A VSWR value of 2 or under is typically acceptable for antennae in communications systems. Q. 41:1 with a return loss of 15. 50 from 6 votes. In addition, if GAMMA, VSWR, or dB is known, the calculator can convert between the three. This is an ideal situation that rarely, if ever, is seen. REGISTER. 02 VSWR (i. comOnce the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. Now, let us investigate the physical meaning of return loss. dl. 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. A high return loss is desirable and results in a lower insertion loss . This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). Value dB. The power reflected back from an antenna is specified using either the voltage standing wave ratio (VSWR) or the reflection coefficient (also referred to as return loss). The VSWR value should be close to 1. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. With the initial values in place, you need only click on Calculate. vary with frequency). VSWR (voltage standing wave ratio, sometimes pronounced "viswar"), is the ratio of the maximum standing wave amplitude at one node to the minimum. VSWR. 39 0. Convert VSWR to Return Loss and vice versa. 0 dB return loss). The equivalent VSWR is 1. Usually this is the threshold when most devices are considered. 091) (0. Click here to use the VSWR Calculator . It's located in our download area . The isolation S23 is exactly -20 dB at the center frequency, while the output match is also degraded to about -13. VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. 5:1. 97dB. Pasternack's VSWR/Return Loss Calculator finds VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. 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. Pasternack's RF calculators and conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Antenna efficiency doesn't cover reflected power due. An example of this would be a. 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. Calculate inductive reactance of a tranmission line from electrical length given permittivity, frequency and characteristic impedance: wdivider_1: Calculation of the frequency dependent effective permittivity efff: wavelength_calc: Calculation of the wavelength in media: watts2dbm: Watts to dbm calculator: vswr2returnloss: VSWR to return loss. Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. See the relationship between VSWR and return loss. cdn-anritsu. 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. The simulated return loss was −20. Where I2 is the cell containing the VSWR. 51 dB, and a return loss of 9. In the above. 72 0. Hey, this part is pretty-well matched! You lose less than 0. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. Definition of VSWR. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. The reflection coefficient is also known as s11 or return loss. Return Loss. Archive Documentation Data Software. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. Search for: Components MenuNote that the Insertion Loss is typically low in the desired band of frequencies, and the Return Loss is high. If “V” is used, then the ratio is defined to voltage level of a standing wave at a line. Low-pass lumped element filters. Just entered the value or click calculation. VSWR to Return loss calculator. This means return loss will always be positive. . Requires Windows 7 (64 Bit) or higher. $ = Gamma^2 = 10^{-RL/10}$ Power transmitted ratio for system 1 is 0. I hope this adds to the knowledge of the. 4300 | info@markimicrowave. Reflection -10dB: 1/10 th of the RF energy is being reflected. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). They are related but measure different aspects of signal performance. July 7, 2021 By Bill Schweber. This site comprises a comprehensive array of tutorials and related tools, including explanations, examples, references and charting. This is an ideal open or short circuit, equivalent to VSWR=infinite. Use the S11 value in the calculator above to find the equivalent VSWR. Return loss can be measured by using microwave and RF test. Return loss and VSWR are two important measures of efficient power transmission and both of them can be interconverted to obtain the value. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. Enter Your Values. Marki Microwave's Tools is a collection of free online applications for RF analysis and synthesis that are easy to use and mobile-friendly. VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. VSWR Calculator. 1 Thus, for this system, VSWR = 1:1 (i. To calculate the Return Loss, add 1 to the VSWR and divide the result by the VSWR minus 1. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. Other components in a transmission line system contribute to small reflections of the RF power. g. VSWR Calculator. 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. In an ideal RF system, all of the energy from the RF source is transferred to the load. This is an ideal open or short circuit, equivalent to VSWR=infinite. We can then find the return loss as -20 * log(0. VSWR to Return Loss . If system 1 is a cable, then it's between 8 and 14dB. everything RF has an largest selection of wired calculators for the RF and Microwave Industry. Pout is the output power or signal level. This application note supplies a free of charge software tool that can e. VRMSF and VRMSR are measured and the return loss is back calculated. For. Stage: NF (dB) Gain (dB)0. 2 8. The component is said to have a loss of 25 dB. Coupling to Direct Line Insertion Loss Conversion Table for Directional Couplers. The issue here is that when one of the traces on the NanoVNA is displaying LOGMAG (or the Base 10 logarithm of the Magnitude of the signal) it is showing you the Return Loss. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. This calculator computes the VSWR, reflection coefficient, return loss and matching loss in a transmission line. The voltage standing wave ratio (VSWR) is defined. Return Loss to VSWR Conversion Chart. 2. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. 0 dBFor our measurements we replace the antenna with a 50 ohm termination (vswr 1. 64/100) = ±0. 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. This reduction of signal, also called attenuation, is directly related to the length of a cable—the longer the cable, the greater the insertion loss. Just keep in mind that SWR and Return Loss are both indicators of the quality of the transmission line to antenna feedpoint Z match. 011. microwaves101. VSWR to Return Loss Conversion Table. Click Here To Download Product Brochure. ZoAt 100 MHz, the loss is 0. 0:1). reflection coefficient Calculator. It's assumed that the source impedance is also complex. Application Note File. VSWR to Return loss calculator. Pi Attenuator Calculator. In the ideal case where the source, transmission line and load all have an impedance of 50 Ω the VSWR will be 1:1 (perfectly. e. 778. With this table, engineers can quickly. 009. Reflection -10dB: 1/10 th of the RF energy is being reflected. 54dB. Note that in general S-parameters are a function of frequency (i. VSWR (input) : Return Loss in dB (output): Return loss calculation EXAMPLE : VSWR = 1. Note: The historical definition of return loss results in a negative sign. everything RF has the largest selection is online numerical for and RF and Microwave Industry. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. 9 mm which. Reflection -3dB: half of the RF energy is being reflected, and thus half of the energy is being received by the device. VSWR to Return Loss (dB) Calculator. This attenuation calculator provides as output to the user the original return loss, the improved return loss and final VSWR. Return loss decibel is mostly read by the the antenna analyzer test equipment. The low-pass filter often is a natural choice for lumped element filters. Return loss and mismatch loss Calculator Return Loss and Mismatch Loss Calculator Calculates the absolute load impedance, reflection coefficient, VSWR, return. Just enter the value real click calculate. They are related but measure different aspects of signal performance. Now, assume a "more perfect" termination of 51 ohms was used. 21b) VSWR = 1/(q + p), where q = 0. 0. 8. Insertion loss causes due to two factors namely ohmic loss, dielectric leakage and the return loss is caused due to mismatched systems. 6 Adding VSWR to the MixT Attenuator Calculator. 000Match Efficiency (%) Calculates Match Efficiency. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. Γ is then used to calculate the return loss. The two VSWRs produce a combined return loss, as follows: The uncertainty in the total measurement stemming from the source and load VSWRs is Uncertainty (+)=20log 10 (1+ γ 1 ·γ 2 ) dB, and Uncertainty (–)=20log 10 (1–γ 1 ·γ 2 ) dB. The power reflected back from an antenna is specified using either the voltage standing wave ratio (VSWR) or the reflection coefficient (also referred to as return loss). RF calculations and RF conversions include metric. Then click the "Calculate" button next to the value you just typed to compute the others. This indicates the effectiveness of the coupling, and that a large part of the energy is transmitted to the antenna with very little reflection. Note the same numerals are used with just a shift in the decimal point. It is specified in dB. VSWR Calculator: This is the ratio of maximum voltage to minimum voltage in standing wave pattern. 0 Return Loss / VSWR. 979Return Loss (dB) Calculates Return Loss -13. 868. 557 GHz. 01. 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. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. This is equal to a return loss of 14 dB or greater. VSWR = ∞ is the worst condition. By Marki Microwave, Posted Wed May 19 2010. This calculator is used to calculate the uncertainty of gain for any active RF device (mostly amplifier) that occurs because of the impedance mismatch. 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. Input Return Loss Var2. However, if the parasitics differ much from 0. Radio Frequency Engineering Calculator. Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. everything RF has the largest selection of buy calculators for the RF and Stove Industry. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. 1-800-761-3041 Contact Account Cart Search Waveform. 43 20. Simply enter the value and click calculate. The calculator on this page helps determine the loss and that can be factored into the design or RF link budget. ABOUT US. 14 dB per hundred feet. Particularly, reflected power and mismatch loss help describe the need for the antenna (with its matching network) to provide a suitable return loss to the active electronics. From a certain perspective 'Return Loss' is a misnomer. 1 Return loss in dB = 26. Pressing the [Calculate] button with no inputs will load the example below. 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. 또한 안테나의 경우도 실무상에서 Return loss보다는 VSWR로써 비교할 때 좀더 실질적인 비교가 가능하기도 하다. This is an online computers that calculates VSWR based on Return Loss. 002 respectively as shown in table-6 for the notch width, g=1. The amount delivered to the antenna is written as ( ), and is simply (1- ^2). narrowband components) should provide a system worst case of 18dB return loss. The return loss is the ratio of the power of the. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1]. everything RF has the largest selection in online hand for. You can use our VSWR calculator to see that 1. Title:. VSWR (Voltage Standing Wave Ratio) is a measurement of how well matched a radio transmitter and transmission line is to a load. 2. 794 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. Coaxial Photos;. VSWR and Return Loss RF Calculator. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1] Return Loss on Wikipedia Conversion Tables. Just enter the value and click calculate. Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. voltage standing wave ratio 020710. 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. Note that it blows up at the lower cutoff frequency of 6. 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:. Here Click here to learn more about VSWR. 9. High VSWR values indicate less efficient power transmission and can lead to significant. 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 vector network analyser. VSWR = Voltage standing wave ratio. 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. . This is an online calculator that calculates VSWR located on Return Loss. There are a number of points to. SFDR Visualizer This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. 4. Mismatch Loss (dB) 3. The first one is a VSWR-to-Return Loss converter, where I input a number that every RF engineer and technician should have memorized for easy reference: 1. directly calculate and display the resulting VSWR value. Because the reflection coefficient Γ < 1, then the return loss will have a positive dB value. 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. everything RF has this largest selection about online calculators for the RF and Cooking Industry. The calculated value is MUCH worse. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and mismatch loss (ML) is calculated by using following formulas. 54 dB (11% of your transmitter power is reflected back). Poor VSWR can cause shadowing in a TV broadcast system as the signal reflected off the antenna reflects again off the power amplifier and is then rebroadcast. It varies from 1 to (plus) infinity. But, for a practical system, there will be a small impedance. 7. When using VSWR and Reflection Coefficient it is often encessary to use formulas or equations to determien the values. Because the reflection coefficient Γ < 1, then the return loss will have a positive dB value. How to improve the Return Loss of an amplifier. To do so, calculate the desired return loss and subtract the known load return. 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. The calculator converts between return-loss, VSWR, reflection coefficient, and mismatch loss. A good VSWR to aim for is at least 1. Where, RL = Return loss in dB. Conclusion : In summary, RL and VSWR formulas and calculators are valuable tools that enhance the efficiency. As an example, if the return loss of the amplifier is 4 dB, use the calculator below. VSWR is a measure of the reflected power on a transmission line. It is a necessary tool for designers when they want to ensure that their antennas are working correctly and performing as expected. The VSWR monitoring system consists of an ADC for real-time measurements. It also shows the percentage of forward to reflected power. Return Loss. If you don't have Excel you can. This makes it a more direct measure of reflections than VSWR. Typically, Insertion loss will of a fraction of a db (for co-axial cable) and the Return loss is 10 dB or more. 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. 500VSWR Calculates VSWR 1. Unless you have a piece of slotted line-test equipment this is a hard definition to use, especially since the concept of voltage. dB (S 21) SWR = to 1: Insertion Loss = dB (S 21) Return Loss = dB (S 11) Return Loss = dB (S 11) NOTE: NOTE: Introduction to scattering parameters (S 11 and S 21): SWR is always greater than 1 to 1. The large number of samples provides averaging, which is necessary in applications. Lower insertion loss values are preferable, indicating less signal power loss and better component/system efficiency for RF applications. A table of convenient values are presented at the bottom. Just enter the value and click calculate. One is tempted to seek the maximum value and make a “pass / fail” decision based on this value. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. com Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. Thus, the 55-ohm termination contributed 26 dB loss to the inherent 6 dB loss of a two-way splitter. Always expressed as a ratio to unity, a VSWR of 1. Calculate. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . 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. Loss (dB) Volt. The Reflection Coefficient can be calculated. 미스매칭 환산표 ( Return Loss - VSWR ) 고주파 회로에서의 정합성은 Return Loss(반사손실)이나 VSWR(Voltage Standing Wave Ratio, 전압정재파비)로 표시한다. A series of RF calculators for radio frequency engineers. 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 is a mathematical equation to accurately calculate the VSWR of an RF system. Effective Radiated Power and Coax Loss Calculator. The Smith Chart Pegasus Technologies. If you only need to convert between GAMMA, VSWR, and dB, you can ignore Zo and ZL. 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. 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. 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. As it can be seen from the above equation, VSWR is always a real and positive number with a minimum value of 1. The losses are due to copper losses/skin loss and for more esoteric antennas (planar types) it's usually dielectric loss. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc.