Preferred resistor values are entered into the text boxes, similar to the way that values for a prototype may be selected. Output Return Loss Var3. VSWR and Return Loss RF Calculator 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. The VSWR Calc program is a Microsoft Visual Basic 32-bit application that runs on Windows 95, 98, and NT 4. 8. Note: The calculations for Total P1dB and NF use linear values. 6m RG-58C/U to vertical. Click here to use the VSWR Calculator. Directivity, on the other hand, is the level of the signal which appears at Port 4 and is undesired. Figure 1 — A graph showing the additional loss in a transmission line due to SWR. 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 voltage standing wave ratio (VSWR) calculator determines reflection coefficient (GAMMA), VSWR, and return loss (dB) for a mismatched line. Reflected Power. WhatsApp. 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. . There is a mathematical equation to accurately calculate the VSWR of an RF system. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. Conclusion: In summary, RL and VSWR formulas and calculators are valuable tools that enhance the efficiency, accuracy and consistency of RF engineering tasks such as measurement, analysis, troubleshooting and system design. VSWR. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Enter the Noise Figure and gain for each stage. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. PI Attenuator Calculator. It varies from 1 to (plus) infinity and is always positive. With the initial values in place, you need only click on Calculate. The return loss is a convenient parameter to use when the value of Γ becomes small. 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. 51 dB, and a return loss of 9. 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. 009. The two VSWRs produce a combined return loss, as follows:. Return Loss (dB) to VSWR Calculator. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. A negative loss of 0. For five t-line sections each having a VSWR of 1. 54 dB (11% of your transmitter power is reflected back). Pi Attenuator Calculator. Reflection Coef. Pasternack's VSWR/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. (19/1. The first-factor ohmic loss is an unavoidable loss as it is a property of. Many antenna specification sheets list the VSWR and some list the return loss, but many do not. Related Posts. 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. Introduction Input Type: 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. October 20. Formula is:: reflection coefficient(Γ)= VSWR = VSWR Calculator:(by using RL)The VNAs with math modes can also directly calculate and display the resulting VSWR value. Γ = (VSWR – 1)/(VSWR + 1) Return Loss (dB) = -20*Log 10 (|Γ|) Mismatch Loss (dB) = -10*Log 10 (1. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. But the meter at the transmitter will show a VSWR of 1. 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). These reflections are very undesirable when we aim to transfer power from one. Example 2. Then, take the logarithm base 10 of the result and multiply it by 20. For one example, if you have two 2:1 mismatches separated by some distance, the worst case at some frequencies will look like 4:1 VSWR. Calculate SWR and return loss from impedance values. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. 500VSWR Calculates VSWR 1. (1)vswr return loss calculator waveguide calculator circular waveguide calculator rectangular wavelength tem calculator wire loop inductance calculator wire microstrip impedance calculator wire over plane inductance calculator wire self inductance calculator wire stripline impedance calculator. Poor VSWR can cause shadowing in a TV broa1) VSWR Calculation. These calculators and. Balanced Attenuator Calculator. Typically, for field applications, the DTF Return Loss mode is used. 4. How to improve the Return Loss of an amplifier. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. Like insertion loss, return loss is also generally described in decibels of power. 6 Adding VSWR to the MixRG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. 05 VSWR max. 2 means a peak voltage 1. VSWR (voltage. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1]. 4569. 405 inch. 1060. VSWR. 2 dB due to reflection. 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. VSWR to Return Loss (dB) Calculator. The VSWR monitoring system consists of an ADC for real-time measurements. Cell Site Commissioning and Maintenance. Use the S11 value in the calculator above to find the equivalent VSWR. These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). 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. Reflection. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Gain Var5. 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. S-parameters, S11 and S21. The equivalent VSWR is 1. 99 $ = 1-\Gamma^2$ 2. Đây còn được gọi. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. Frequency to Wavelength. 99 $ = 1-Gamma^2$. Suitable for higher power (~1800 watts) at HF. מדריך שלם ל- VSWR מ-FMUSER [עודכן 2022] בתורת האנטנות, VSWR מקוצר מיחס גל עומד מתח. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. Requires Windows 7 (64 Bit) or higher. Forward Power vs Return Loss Calculator RF calculators and converters. Enter LO Tuning Range, IF frequency/bandwidth and injection side. Let’s start by looking at a 2-port device illustrated in Figure 1. You can use our VSWR calculator to see that 1. Once the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. 5:1. 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. A01TKL_ RF Inductor by Coilcraft →. From the table we can understand that when the return loss is <10dB, the antenna will be at VSWR >2, indicating the system will reflect >30% power and the performance of the antenna will be <70%. Do y. Ko(mA) Fc(kHz) Kvco(MHz/v) PM(deg) Fout(MHz) Gamma: Fcomp(kHz) T31: C1: C2 R2: R3: C3:RF Two Wire Transmission Line Loss Calculator. Input Return Loss Var2. Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. Consider the antenna being used in transmit mode. VSWR Calculator. 5:1 is considered ideal in the. Marki Microwave's Tools is a collection of free online applications for RF analysis and synthesis that are easy to use and mobile-friendly. 0. Return loss is the fiber optic light gets reflected back at the connection point. Reflection Attenuator Calculator. The result is an antenna VSWR or return loss measurement corrected for cable loss. Formulas used: s r r. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR = Reflection Coefficient = Return Loss = dB: Match Efficiency = % Net. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. Conversion Formulas. 01:1 to 3. 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. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Free online calculators. 458:1 in VSWR equals 14. A match is good if the return loss is high. Tee Attenuator Calculator. 600mW. $ = Gamma^2 = 10^{-RL/10}$ Power transmitted ratio for system 1 is 0. 51 dB, and a return loss of 9. Watts the reflected power would be 1 Watt. 5. An example of this would be a. This is an online calculator that calculates Return Loss based on Reflection Coefficient. There is also a selection of suitable RF. 4 GHz. Mismatch can be specified as: the VSWR at the load end of. To calculate the Return Loss, add 1 to the VSWR and divide the result by the VSWR minus 1. This site comprises a comprehensive array of tutorials and related tools, including explanations, examples, references and charting. This impedance mismatch can be with a device inserted in the line or with the terminating load. 1. 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. Return Loss to VSWR Conversion Chart. VSWR. 7. This makes it a more direct measure of reflections than VSWR. 25 on the worst path and the insertion loss is 0. 51 dB, and a return loss of 9. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. The graph below shows input return loss for an amplifier. Calculate the uncertainty in gain of an amplifier due to the mismatch in impedance. VSWR & Return Loss Calculator: Enter forward and reflected power or match to determine equivalent values. In an RF system, when power is sent from the source to load, there are three main parameters to be considered: (1) incident power; (2) reflected power; and (3) power absorbed by the load. Custom. be used to add or subtract an arbitrary number of power, to convert power and voltage units from the linear to the logarithmic. 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. Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. This calculator converts Return loss (RL) to Voltage Standing Wave Ratio (VSWR). 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 Return Loss Calculator. 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. VSWR to Return Loss Conversion Table. i Created Date: 11/26/2012 4:49:33 PMMeasuring Insertion Loss using RETURN LOSS MODE. 0:1, 2. A match is good if the return loss is high. Values for L1, L2 and C will be calculated. U. A VSWR of 1:1 means that there is no power being reflected back to the source. VSWR Return Loss (dBm) VSWR Return Loss (dBm) VSWR Return Loss (dBm) VSWR. 0:1,. You can calculate return loss when the VSWR is known. The formula for mismatch loss is simply: mismatch loss= (1-|Γ| 2) alternatively, mismatch loss=1-ρ 2. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. These measurements show the user the match of the system and if it conforms to system engineering specifications. S. VSWR adalah VSWR juga dapat di artikan sebagai perbandingan antara gelombang maksimum dengan gelombang minimum. 54-88 MHz -- Low VHF; 88-108 MHz -- FM;S11 then would be the reflected power radio 1 is trying to deliver to antenna 1. R/F Calculators and Conversion Tools VSWR / Return Loss Calculator Find VSWR (Voltage Standing Wave Ratio), Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. Step 4. Updated on. Enter the source characteristic impedance and the load impedance then press "Calculate" below. reflection coefficient definition. They are related but measure different aspects of signal performance. The first reflection back from each system will be the largest and subsequent reflections will be heavily attenuated, so we. 05 + 1. In this context, the term S-parameters or. Just enter the value and click calculate. 17. On the other hand, you calculate VSWR by using the maximum and minimum voltage levels of the standing wave pattern on a transmission line. Created Date: 10/21/2015 12:42:40 PM. VSWR = Voltage standing wave ratio. 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. It is the major factor contributing to the total signal efficiency of the connector. 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. The Antenna Downtilt and Coverage Calculator (aka Antenna Tilt Angle Calculator) is used to determine the approximate downward angle, measured in degrees, which the transmitting antenna is to be positioned for optimal signal strength and coverage. 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. 8. 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. The formula and equations used by this calculator are also provided. 5dB loss per 100 feet at 146 MHz). It's located in our download area . 0:1, 2. This antenna tilt angle calculator also provides,. S22 would be the reflected power radio 2 is attempting to deliver to antenna 2. If VSWR is known, then the reflection coefficient (Γ), return loss (RL),. Formula. 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. In some systems this is not a trivial amount and points to the need for components with low VSWR. dBm to Watt: Tool to convert the dBm to Watt unit 3. Reflection Coef. The losses are due to copper losses/skin loss and for more esoteric antennas (planar types) it's usually dielectric loss. If you only need to convert between GAMMA, VSWR, and dB, you can ignore Zo and ZL. Reflection Calculator. To calculate the Return Loss, add 1 to the VSWR and divide the result. The isolation S23 is exactly -20 dB at the center frequency, while the output match is also. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. sales@minicircuits. Telegram. It is the ratio between transmitted and reflected waves. 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 theVSWR to Return Loss . 2. If “V” is used, then the ratio is defined to voltage level of a standing wave at a line. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. אנו יודעים שהגל העומד, המסביר את יחס הגל העומד, הוא. Add to My Products Lists. 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. Enter. Stage: NF (dB) Gain (dB)The voltage standing wave ratio (VSWR) is defined. Mismatch Loss (dB) 3. Increasing return loss corresponds to lower SWR. From a system VSWR level calculate the following parameters:- Reflection coefficient- Forward and reflected power percentage- Mismatch loss in dB. As the VSWR increases, so also does the percentage of reflected power. 54 dB (11% of your transmitter power is reflected back). 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. The following equation is especially useful when using a directional power meter. " – Dr. (under "Support" and "Technical Application Notes" tabs). Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). 0. 1, for system 2 is 0. 6dB. Unused stages should be zeroed. Print - Advertisement - A calculator designed to. Here's a simple VSWR calculator. If our directional coupler had perfect isolation, the return loss of the load would equal the difference between the reflected and forward measurements:. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. Return loss is a meas-ure of how well devices or lines are matched. 54 dB (11% of your transmitter power is reflected back). The equivalent VSWR is 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. N = current stage. Antenna efficiency is the percentage of radiated power compared to non-relected power. 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. 557 GHz. spacing could be found. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Antenna Downtilt and Coverage Calculator. e. Lumped Quadrature Coupler Designer Enter the frequency of operation and system Z0. 891: 6. VSWR is a measure of the reflected power on a transmission line. Return loss, also known as reflection loss, is a measure of the fraction of available power that is not delivered by a source to a load. This test can be performed in the DTF Return Loss or DTF VSWR mode. I hope this adds to the knowledge of the. This calculator is specific to the circuit used in the RF Trap With Attenuators FLEXI-BOX. 8. 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. 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. VSWR and Return Loss RF Calculator. Avg. Active return loss and mismatch calculator with results for absolute impedance, return loss, VSWR, reflection coefficient and mismatch loss. The calculation of loss using VSWR is an approximation that is reasonably accurate on long lines with low VSWR and low loss. (1)You can use our VSWR calculator to see that 1. Where,. There is also a selection of suitable connectors. Just enter the value and click calculate. This application note supplies a free of charge software tool that can e. VTX Power in mW. Urgent questions should be send via email. The calculator on this page helps determine the loss and that can be factored into the design or RF link budget. 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. VSWR =. Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. Return loss vs. 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. As an added bonus, the results are modifiable and can calculate the other values. 2. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. For VSWR=2, reflection coefficient will be=1/3 and 20log (1/3) =-9. VSWR-to-Return Loss CalculatorRF Calculators. 12:1, which is. S. 8. PI Attenuator 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. Return lossHome / Blog Posts / VSWR, Return Loss, Insertion/Transmission loss vs. 009. Qorvo Interactive Tools & Calculators. These parameters are often applied to antennas, RF filters and RF amplifiers such as LNA s and PA s. This calculator is designed to be an informational and educational tool. Calculate VSWR, Return Loss, etc. Return Loss = incident power/ reflected power. A low VSWR will minimize reflections from the antenna. Pressing the ‘Calculate’ button with no inputs will load the example below. Subscribe to receive Mini-Circuits News. The return loss conversion table is a valuable tool for antenna engineers, allowing them to quickly and accurately convert the VSWR values they measure into return loss values. Radio Frequency Engineering Calculator. Enter values for R1 and R2 to calculate attenuator loss and impedance. Reflection Calculator: RL = dB: VSWR = Γ = VSWR = RL = dB: Γ = Zo . Touch Down Points: This Tool will be able to calculate the down Tilt and distance of coverage from antenna for 3dB upper and lower, main loop. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. As part of Qorvo’s commitment to the engineering community, we are providing this collection of RF design tools to assist engineers. By Marki Microwave, Posted Wed May 19 2010. 01. Given a certain level of heat generation within an assembly, thermal dissipation occurs through three primary mechanisms. 5), which will give us 6. The reflection coefficient is also known as s11 or return loss. Mismatch loss is the ratio of power delivered to power available, and is a simple function of reflection coefficient. Unless you have a piece of slotted line-test equipment this is a hard definition to use, especially since the concept of voltage. Note the same numerals are used with just a shift in the decimal point. In an RF system, when power is sent from the source to load, there are three main parameters to be considered: (1) incident power; (2) reflected power; and (3) power absorbed by the load. Consider the antenna being used in transmit mode. VSWR table of return loss vs. To do so, calculate the desired return loss and subtract the known load return. 50:1, with a corresponding return loss of 3. A series of RF calculators for radio frequency engineers. Calculate! Where do these calculations come from? Well, start with the formula for VSWR: If we invert this formula, we can calculate the reflection coefficient (, or the return loss. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. Convert VSWR to Return Loss and vice versa. Voltage standing wave ratio (VSWR) is defined as the ratio between transmitted and reflected voltage standing waves in a radio frequency (RF) electrical transmission system. 1:1 5 0. The easiest way to improve return loss is to add an attenuator. Both terms are used to characterize the uniformity of a cable’s impedance along its length as it relates to reflected energy. Mixer Spur Search Calculate a list of mixer spurious responses for a set frequency plan. 1) RL dB = 10 log P i P r. Values for L, C1 and C2 and R will be calculated. Low-pass lumped element filters. VSWR, Return Loss and Reflection Coefficient Calculators. g. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. Title:. While we’re at it, the reflection coefficient is: Γ=(75-50)/(75+50)=0. Pressing the [Calculate] button with no inputs will load the example below. Noise Temperature to Noise Figure Converter. 0:1, 2. Noise Factor to Noise Figure Calculator. complimentary copy of the "RF Calculator" at . Load return Loss Var4. 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. 39 0. 93 dB. 1) (7. Return loss quantifies the amount of reflected power, while insertion loss quantifies the loss of power as it passes through the component or device. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. 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. But, for a practical system, there will be a small impedance. Keep in mind that some calculators for RF have hard-coded units; if the label says (nF), for example. Pasternack's VSWR/Return Loss Calculator finds VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. dBm To Watt Calculator. The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of the listed input types. The. Electrical waves reflect when they encounter a change in the impedance of the medium they are traveling in. 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. 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. The online calculators are usable in pop-up mode for easy desktop access and functionality. VSWR Conversion Table. 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. 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. A good VSWR to aim for is at least 1. Result. w (mm) t (um) Er: h1 (mm) h2 (mm) Impedance: Notes: *Comparisons show minimal differences to ADS linecalc and Polar Instruments Quicksolver industry standard tools. 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. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. 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. 002 respectively as shown in table-6 for the notch width, g=1.