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 corresponding value in the right column is the return loss value. The MAX2016 is a dual logarithmic detector/controller used to monitor the VSWR/return loss of an. Wavelength dBm dBuV W dBuVm mWcm2 pJcm2 V VSWR This RF calculator has been developed by Compliance Engineering as a resource for individuals. Formally, S11 is the negative of return loss and has. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. Telegram. The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. SummaryCoaxial Cable Impedance Calculator. You can access the RF Path Calculator at the Calculators page of our website. 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 −. 7145 VSWR 6 Directivit y of directiona l coupler 23 dB 0. VSWR is the ratio of the peak amplitude of a standing wave to the minimum amplitude of a standing wave, as seen in the following Figure: Figure 1. This mix of web-based tools and downloadable Windows software was developed to help engineers design faster and more accurately. High VSWR values indicate less efficient power transmission and can. 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. 50:1, the resulting maximum VSWR will be 4. 0 indicates about 75% of the power is delivered to the antenna (1. Convert VSWR to Return Loss, Reflection Coefficient, and Mismatch Loss with our easy conversion calculator. 05 VSWR max. These measurements show the user the match of the system. e. 3. 15 + 1. 5dB loss per 100 feet at 146 MHz). For transmission lines to have the highest quality, it is necessary to have impedance matching. 5:1 정도로써 입력매칭이 거의 완전하게. Title: dg03-110. As an added bonus, the results are modifiable and can calculate. The following formula relates the return loss and VSWR. VSWR is another way of measuring signal reflections. com . So a perfect match can be represented by the range 0. Do y. The image below shows what your completed Excel sheet might look like. Example Problem Find the SWR of the transmission line or wave guide whose load or. Just enter the value and click calculate. VSWR = Voltage standing wave ratio This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. If our directional coupler had perfect isolation, the return loss of the load would equal the difference between the reflected and forward measurements:. Power measurement. For VSWR=2, reflection coefficient will be=1/3 and 20log(1/3) =-9. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. Learn about voltage standing wave ratio (VSWR), return loss, and mismatch loss, which helps characterize the wave reflections in a radio frequency (RF) design. 4ghz. Custom. The component is said to have a loss of 25 dB. Pi Attenuator Calculator. Wavelength Calculator. Interactive Tools & Calculators. This site comprises a comprehensive array of tutorials and related tools, including explanations, examples, references and charting. Keep in mind that some calculators for RF have hard-coded units; if the label says (nF), for example. 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. Introduction to VSWR. Yes, we did that without a calculator. 50 from 6 votes. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. In terms of the reflection coefficient: If VSWR = 1, G 0 = 0 (no reflection) = vp f, vp= c r 0 100 200 300 400 500 600-1. 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 ). 50:1, with a corresponding return loss of 3. Standing Wafes merupakan daya yang tidak diterima oleh beban dan dipantulkan Kembali sepanjang saluran transmisi. 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. This configurator will generate a bill of materials for a Constellation power delivery system. Return Loss. VSWR to Return Loss Conversion Table. VSWR table of return loss vs. VSWR to Return Loss Conversion Table. These equations can be solved with a personal computer and suitable software, or the parameters may be determined with the Smith Chart. 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. 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 is the ratio of maximum voltage to minimum. 05 VSWR max. 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 (:1) Return Loss (dB) Reflection Coefficient (Γ) Mismatch loss (dB) Reflected Power (%) Through Power (%) VSWR Calculator. 64/100) = ±0. This can be achieved by regulating the inner and outer diameter of the coaxial cable, along with the. e. As an added bonus, the results are modifiable and can calculate the other values. The ratio of the input to the reflected signal is called the Voltage Standing Wave Ratio (VSWR). In summary, return loss is the loss of signal power due to signal reflection or return by a discontinuity in a fiber-optic link or transmission line. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). Same-day shipping if you order in the next hours!. 299 0. VSWR. 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. A known return loss is applied to the RF OUT port. 특히 Return loss와 VSWR의 대략적 값의 관계정도는 암기해두는게 편리할 때가 많다. Return Loss (dB) 3. VSWR. Suitable for VHF (~1. The main cause of the mismatch is the deviation in the con-Ο υπολογιστής vswr σε rl χρησιμοποιεί αυτόν τον τύπο για να μετατρέψει τις τιμές vswr σε τιμές rl. The isolation S23 is exactly -20 dB at the center frequency, while the output match is also degraded to about -13. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. long or about 1. The following formula is used to calculate the Return Loss (RL) from Voltage Standing Wave Ratio (VSWR). (3) ea 90°E-Bend - 1. 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. Pout is the output power or signal level. Forward Power vs Return Loss Calculator RF calculators and converters. VSWR / Return Loss Calculator. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. 5 1 1. Solved Example. 0 or the results don't mean anything!). Subscribe to receive Mini-Circuits News. The 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. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. Return Loss (RL) = 10 * log(Pr/Pi) Return Loss (RL) in dB = -20* log(Γ) Lesser value of return loss indicates higher impedance matching and vice versa. 2%) = ±3. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and. Suitable for higher power (~1800 watts) at HF. How to Use? Using the VSWR to RL Calculator involves the following steps: Enter VSWR Value: Input the VSWR value that you want to convert into RL. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. 1 Definition of ‘power waves’ The waves going towards the n-port are a = (a1, a2,. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. But the meter at the transmitter will show a VSWR of 1. Print - Advertisement - A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line Inputs. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR = Reflection Coefficient = Follow the discussion. Like insertion loss, return loss is also generally described in decibels of power. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. You can also use LTSpice to calculate S-parameters as well, which is a bit of a hidden trick. 98 dB return loss. This is an online calculator that calculates Return Loss based on VSWR. Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of a resistive matching Pi attenuator. 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. III. 5:1 VSWR is equivalent to -13. The calculated value is MUCH worse. 98 dB 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. 0 0. 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. Conversion Formulas. Convert VSWR to Return Loss and vice versa. 40) a common limit for sweeps with an antenna at the far end. 9913 and LMR-400 are popular “low-loss” RG-8 types. For example, an efficiency of 0. . Fortunately, there’s a very easy way to analyze complex loads using graphical methods and it’s called the Smith Chart. To do so, calculate the desired return loss and subtract the known load return. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. 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. 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 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). 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. Radio Frequency Engineering Calculator. 009. There are two S-parameters of interest. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. 5:1. 5-1-0. flectioncoefficientΓ,voltagestandingwaveratio(VSWR) and return loss (RL) and these quantities are interre-lated. A network analyzer can be used to make S parameter measurements. 000:Return Loss (RL) and Voltage Standing Wave Ratio (VSWR) are related through a mathematical relationship. VSWR is the voltage standing wave ratio it used to measure the all-types waves (example: antenna waves) during transmission. 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. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. VSWR table of return loss vs. VSWR Calculator. VSWR measures the ratio of voltage peaks and valleys. Return Loss and Mismatch Loss Calculator Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. 4 centimeters. 5 1 1. 5, the corresponding value of. 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. Forward Power Watts ? Reflected Power Watts ? VSWR → RL (Return Loss). RF engineers often measure return loss on a “dB. The table shows the effects of combining two components in terms of their maximum VSWR and return loss. 1-800-761-3041 Contact Account Cart Search Waveform. 5 0 0. How to Use? Using the VSWR to RL Calculator involves the following steps: Enter. A perfect match would be 1:1, meaning that the peak amplitude of the signal is always the same (i. —and calculates both the typical system return loss along with the worst case return loss. 많은 초심자들이 대체 왜 return loss란 지표와 VSWR이란 지표가 혼용되는지 이해하기 어려워 하는 경향이 있다. The load ZL imposes an additional constraint on the relationship of the total voltage and current at z = 0: VL IL = V(z = 0) I(z = 0) = ZL. VRMSF and VRMSR are measured and the return loss is back calculated. As an example of common VSWR values, a VSWR of 3. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. 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. The two DTF graphs are the same except for the return loss value at marker 1. 98 dB is equal to the equaivalent return loss of 1. Unequal-split Power Divider Calculator. $\begingroup$ If that was the only information you were given, you would first find the return loss looking at the load, then use system 2's S matrix to find the RL looking into it, then do the same with system 1 until you finally have the RL looking into the entire network. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. Pout is the output power or signal level. While we’re at it, the reflection coefficient is: Γ=(75-50)/(75+50)=0. In Figure 14, the ADL5920 is being used to measure the return loss of the load, also at 1 GHz. VSWR table of return loss vs. As an example, input power of 100 W (50 dBm) and output of 50 W (47 dBm) yields a cable. 0 is the minimum. 7. 54 dB (11% of your transmitter power is reflected back). 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. Solved Example. This is actually a general way to express impedance, but it requires an understanding of complex numbers. 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). Vswr To Rl Formula. Measure S11 across the desired frequency range. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. 11 1. 0. used to calculate the various values of impedances, voltages, currents, and SWR values that exist in the operation of a par-ticular transmission line. Measuring Insertion Loss using RETURN LOSS MODE. Result: Free Space Path Loss (FSPL) calculations are often used to help predict RF signal strength in an antenna system. 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. S. $\endgroup$ – 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. 8. multiplier m=1 RL=50*1 multiplier n=-4 XL=40*-4 multiplier k=2 Z0=50*k Q2: An antenna with a load, ZL=RL+jXL, is connected to a lossless transmission line Z0? What is the phase angle of the reflection coefficient in degrees toRelated Calculators. Calculate impedance from resistance and reactance in parallel. 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. The term ‘forward power is synonymous with powered deliver to the load, or thru power. Advanced Control Components Inc HUBER+SUHNER AG Wellshow Technology Omega Electronics : Most Viewed Articles 6-26. The VNAs with math modes can also directly calculate and display the resulting VSWR value. A series of RF calculators for radio frequency engineers. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. T Attenuator Calculator. 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. Reflection -10dB: 1/10 th of the RF energy is being reflected. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. Return Loss. Calculate return loss, reflection attenuation from a VSWR level. Reflection Coef. Voltage is the pressure from an electrical circuit's power source. Matching Pi Attenuator Calculator. ERP, Line Loss and Various Calculators, Antenna Voltage and Current and Feedline Voltage and Current. Return loss can be measured by using microwave and RF test. This impedance mismatch can be with a device inserted in the line or with the terminating load. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). S-parameters, S11 and S21. 5:1 VSWR is equivalent to -13. 1 Return Loss. Voltage Measured Along a Transmission Line. Free Online. 0001, J2)". VSWR Return Loss Calculator Find VSWR. e. 045 foot x 12 inches/foot x 1000 mils/inch=540 mils. 5 0 0. R = 10log 10 (P incident /P reflected) and. Z (impedance, complex number, in ohms), here are 2 examples of Z: Zs = Rs + jXs, source impedance. Matching Pi Attenuator Calculator. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. For this new launch, both Lou Meyer and Erik Lilieholm have been essential for the tool to be RF-solid. Using our 1 foot equals one nanosecond rule of thumb, let's calculate the 0. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). Simply select the quantity of convergence points, adjust the length and select the cable from the menu to create a bill of materials will be generated - showing the minimum amount of items required to configure a system. 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. Calculate. VSWR Calculator. Usually this is the threshold when most devices are considered. 2. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. Click here for VSWR to RL Calculatorand is usually expressed as a ratio, such as VSWR = 3:1. VSWR specs (specifications) are introduced, along with formulas for mismatch loss and return loss in relationship to VSWR. 205 11. 6 dB of mismatch loss). 5:1 is considered ideal in the RF field, and a VSWR of 2:1 is marginally acceptable for more critical loss systems for low-power applications. reflected energy. 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. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. See the relationship between VSWR and return loss. 54dB. Here's the unwrapped phase of S21:by Eamon Nash Download PDF. The graph below shows input return loss for an amplifier. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. 25 dB of mismatch loss); a VSWR of 7. Step 4. For series combinations of components such as RL and RC combinations, the. You can use it for free. By Marki Microwave, Posted Wed May 19 2010. 93 dB. As an example of common VSWR values, a VSWR of 3. (under "Support" and "Technical Application Notes" tabs). 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). 2. 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. This calculator is used to calculate the uncertainty of gain for any active RF device (mostly amplifier) that occurs because of the impedance mismatch. 35. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. 2. VSWR to Return Loss . 0. It is specified in dB. Antenna). The online calculators are usable in pop-up mode for easy. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. 12] = 6 dB. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. 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. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. To convert from VSWR to Return Loss, find the VSWR value in the left column. cdn-anritsu. Forward Power (W) Reverse Power (W) VSWR. Note: If you select a waveguide size from the dropdown below, the broad wall width will be automatically calculated along with the other results. voltage standing wave ratio 020710. Calculate VSWR, Return Loss, etc. การใช้งาน vswr: หน้าที่หลักของ vswr : เสาอากาศส่งสัญญาณ: อัตราส่วนคลื่นนิ่งของแรงดันไฟฟ้า (vswr) เป็นตัวบ่งชี้จำนวนค่าที่ไม่ตรงกันระหว่างค่า ante nna และ. 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. Use the S11 value in the calculator above to find the equivalent VSWR. RL = dB: VSWR =. Measured forward power vs. applied power and return loss of load, measured at 1 GHz. Reflection Calculator. ZoVSWR / Return Loss Calculator. Return Loss vs VSWR Calculator: The calculator calculates VSWR from return loss and return loss from VSWR. This study aims to optimize rectangular Microstrip Patch Antennas (MPAs) in terms of bandwidth, return loss, input impedance, voltage standing wave ratio (VSWR), impedance matching, and resonant frequency by means of a radiating element that is sliced into eight circular slots. Note that we have a VSWR calculator that will allow you to convert between VSWR, mismatch loss and return loss!. Unless you have a piece of slotted line-test equipment this is a hard definition to use, especially since the concept of voltage. 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. 0 indicates 44% of the power is delivered to the antenna (3. vswr-rl変換する計算ツールです。 イノベーションtop; 研究開発の実績; 博士の電波講座; アンテナ作りのこだわりMatchCalc™ RF Design Calculator. Formula Voltage standing wave ratio is equals to one plus toue (Γ) is reciprocal of one minus toue (Γ) Toue (Γ) is equals to Voltage standing wave ratio minus one reciprocal of. VSWR to Return Loss Formula VSWR = (1 + 10-RL/20)/ (1 - 10-RL/20) Example Calculation A Return. Return loss and VSWR are two important measures of efficient power transmission and both of them can be interconverted to obtain the value. 16-Feb-2022. Return Loss (dB) VSWR. The VSWR value range from 1. RF Works is unable to take liability for. Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places). Since directivity is a ratio of power densities, it is unitless. 12 VSWR max. This can be built into a FLEXI-BOX and a transmission line PCB is. 005 Γ 0 0, 1 01 VSWR 1 0and RL 40 dB, which is difficult to achieve in reality. 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. For support with the MatchCalc tool, contact tool-feedback@qorvo. 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. 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. But the meter at the transmitter will show a VSWR of 1. You can convert between RL and VSWR using above two. If “V” is used, then the ratio is defined to voltage level of a standing wave at a line. Return Loss and Mismatch Loss Calculator. 34:1 or a return loss of 16. Summarizing: Directivity is ratio of power density in a specified direction to the power density averaged over all directions at the same distance from the antenna. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. 600mW. VSWR. The ideal condition, whereYou can assume power dissipation to be uniform, provided the assembly does not operate in high VSWR/return-loss conditions. 92 dB 0. 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. Furthermore, a small VSWR reduces reflections from the antenna. S-parameters, S11 and S21. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. RF calculations and conversions include metric-standard, link. 1) RL dB = 10 log P i P r. Consumers; Contact Us;A network analyzer can be used to make S parameter measurements. Both decimal point and comma are ok. 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 ). See Figure A. A perfect match would be 1:1, meaning that the peak amplitude of the signal is always the same (i. VSWR to Return Loss (dB) Calculator. , an), the wavestravelling away from the n-port are b = (b1, b2,. A 2-port device has two distinctly interesting. Return Loss (RL) is a measure of all reflections that are caused by the impedance mismatches at all locations along the link and is expressed in decibel (dB). WhatsApp. Values for L and C will be calculated for the four topologies shown. The corresponding value in the right column is the VSWR value. VSWR to Return Loss . Once the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. Conversion Formulas. Voltage standing wave ratio (VSWR) is a way to measure transmission line imperfections. 34:1 or a return loss of 16. This formula is used to calculate the VSWR from the given return loss. If our directional coupler had perfect isolation, the return loss of the load would equal the difference between the reflected and forward measurements:. If the antenna reflects 250 watts the VSWR at the antenna will be 1.