vswr return loss calculator. VSWR, Return Loss and Reflection Coefficient Calculators. vswr return loss calculator

 
 VSWR, Return Loss and Reflection Coefficient Calculatorsvswr return loss calculator  Note, that in this conversion to return loss all phase information is lost

It is specified in decibels (dB) relative to a short circuit (100 percent rejection). Same-day shipping if you order in the next hours!. A series of RF calculators for radio frequency engineers. S-parameters, S11 and S21. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. 3. 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. 72 0. If our directional coupler had perfect isolation, the return loss of the load would equal the difference between the reflected and forward measurements:. 6dB. , the signal reflected back in a transmission line. This is an online calculator that calculates Return Loss based on VSWR. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1] Return Loss on Wikipedia The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. Calculate. Consumers; Contact Us;VSWR / Return Loss Calculator. VSWR Calculator. High return loss means low reflected power, so high return loss is good for a system. e. 2 times the minimum voltage along that line, if the line is at least one half wavelength long. 794VSWR Calculation. This collection of RF and Power Management design tools reflects Qorvo's commitment to the engineering community. 14 dB per hundred feet. It is the ratio between transmitted and reflected waves. 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. 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. From this the reflection factor Γ and the Voltage Standing Wave Ratio (VSWR or SWR) could be determined using the following definitions: – Γ is defined as the ratio of the electrical field strength Eof the reflected wave over the forward travelling wave: Γ = Eof reflected wave Eof forward traveling wave. This general RF calculator. VSWR can also be complex (Re+jIm, in theory) but most people just use it with "Real" values and is always >= 1. Note: The calculations for Total P1dB and NF use linear values. I hope this adds to the knowledge of the. Preferred resistor values are entered into the text boxes, similar to the way that values for a prototype may be selected. 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. In some systems. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. com +1 (718) 934 4500 +1 (800) 654 7949. 500VSWR Calculates VSWR 1. dBm To Watt Calculator. Enter a value for VSWR (remember: VSWR should be a number larger than 1. Email. This antenna tilt angle calculator also provides,. How to fill out return loss to VSWR: First, calculate the return loss (RL) value using the formula RL = -20*log (VSWR+1). Mismatch can be specified as: the VSWR at the load end of. Return Loss (dB) VSWR. Step 1. This calculator converts Return loss (RL) to Voltage Standing Wave Ratio (VSWR). 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. 1) RL dB = 10 log P i P r. For five t-line sections each having a VSWR of 1. 2 8. Many antenna specification sheets list the VSWR and some list the return loss, but many do not. 2:1 VSWR. 0:1). Voltage standing wave ratio (VSWR) (pronounced "vizwar" [1] [2]) is the ratio of maximum to minimum voltage on a transmission line . 98 dB return loss. *Strictly, a loss quantity when expressed in dB should be positive. 0:1, 2. 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. Return Loss is the amount of power that is lost in the signal returned/reflected by a discontinuity in a transmission line. What is the VSWR ratio to return loss? There is an inverse relationship between Voltage Standing Wave Ratio (VSWR) and Return Loss. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and mismatch loss (ML) is calculated by using following formulas. Set the start and stop frequencies F1 and F2. Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. Telegram. Updated on. VSWR Calculator. Hence, the return loss is always lower than the ideal system (i. Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. The reflection coefficient is also known as s11 or return loss. By Marki Microwave, Posted Wed May 19 2010. For example, a VSWR of 1. Add to My Products Lists. This is an online calculator that calculates Return Loss based on Reflection Coefficient. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. 5:1. Where, RL = Return loss in dB. G = Gain. If VSWR is known, then the reflection coefficient (Γ), return loss (RL), and mismatch loss (ML) is calculated by using following formulas. Elite RF. 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. 405 inch. 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. Next, plug in the calculated return loss value into the formula VSWR = (1 + 10^ (RL/20))/ (1 - 10^ (RL/20)). This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line supplied to the calculator. Like insertion loss, return loss is also generally described in decibels of power. Note: impedance is a complex quantity, it has real and imaginary parts or magnitude and phase; instruments are almost always calibrated for Zo being some nominal real value, is Xo=0 (eg when people speak of a 50Ω instrument, that means 50+j0Ω even if they don't. 99 $ = 1-Gamma^2$. It is a natural phenomenon that occurs for any type of transmission—whether it's electricity or data. VSWR Return Loss (dBm) VSWR Return Loss (dBm) VSWR Return Loss (dBm) VSWR. Return Loss and Mismatch Loss Calculator. 979Return Loss (dB) Calculates Return Loss -13. 2. This makes it a more direct measure of reflections than VSWR. 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. Your26 (800) TMS-COAX • LMR-400 TIMES MICROWAVE SYSTEMS Connectors Inner Outer Finish* Part Stock VSWR ** Coupling Contact Contact Body Length Width Weight Interface Description Number Code Freq. Suitable for higher power (~1800 watts) at HF. 2. reflection coefficient definition. Select operating frequency. At the same time another trace can be set to display the VSWR. VSWR can be generated by Network Analysers. VSWR / Return Loss Calculator: IRA Calculator: Wavelength (TEM) Calculator: Link Budget Calculator **Note: All of our radio frequency calculators allow SI prefix input. Note: If you select a waveguide size from the dropdown below, the broad wall width will be automatically calculated along with the other results. S. U. Transmission Power. 9, for system 2 is 0. Definition of VSWR. 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. 98 dB. 51 dB, and a return loss of 9. 15. VSWR table of return loss vs. 2. Our fiber optic components insertion loss is less than 0. In this context, the term S-parameters or. These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). In some systems this is not a trivial amount and points to the need for components with low VSWR. dB Path Loss with respect to dipole or isotropic antenna: Watts: dBw or dBm: microVolts: dBm: pforward (Watts) pref (Watts) Return Loss or a VSWR: return loss (dB) (evaluated as neg. Email. This is an ideal open or short circuit, equivalent to VSWR=infinite. Consider the antenna being used in transmit mode. For S 11 it is also possible to display return loss and (voltage) standing wave ratio [(V)SWR] over frequency range. The first reflection back from each system will be the largest and subsequent reflections will be heavily attenuated, so we. Reflections are measured using either VSWR or Return Loss. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line. Frequency GHz MHz: ImpedanceOn-Demand Webinars. VSWR is defined as the ratio of the maximum to minimum voltage on a loss-less transmission line (expressed as 3. Noise Factor to Noise Figure Calculator. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). Refl Coeff Power Transpower. This calculator allows calculation of VSWR from Zload (or Yload or S11) and Zo. Reflected power ratio for system 1 is 0. The return loss and VSWR measurements are key measurements for anyone making cable and antenna measurements in the field. Note, that in this conversion to return loss all phase information is lost. How can I calculate VSWR, return loss, and reflected power? Our online VSWR calculator can help you calculate VSWR, return loss, and reflected power based on characteristic and load impedance. complimentary copy of the "RF Calculator" at . 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 to Return Loss (dB) Calculator. 8. Yoni Calculator Online Test System Configurator ezSample. It varies from 1 to (plus) infinity and is always positive. 40) a common limit for sweeps with an antenna at the far end. Unless you have a piece of slotted line-test equipment this is a hard definition to use, especially since the concept of voltage. Các ứng dụng của VSWR: Các chức năng chính của VSWR : Truyền Antenna: Tỷ lệ sóng đứng điện áp (VSWR) là một chỉ báo về lượng không phù hợp giữa một ante nna và đường cấp dữ liệu kết nối với nó. In addition, the calculation takes into account the effect of signal attenuation in the transmission line. A low VSWR will minimize reflections from the antenna. The ratio of the maximum to minimum voltage is known as VSWR, or Voltage Standing Wave Ratio. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. 1 Return loss in dB = 26. 8. Note: Equation 1 below uses linear power units (mW/W), while Equation 2 uses dBm/dBW. Interactive Tools & Calculators. Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). The concept of loss factor is discussed on this page. Formula. everything RF has the big selection of get calculators for the RF and Microwave Industry. 8. VSWR specs (specifications) are introduced, along with formulas for mismatch loss and return loss in relationship to VSWR. From a system VSWR level calculate the following parameters:- Reflection coefficient- Forward and reflected power percentage- Mismatch loss in dB. 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. 8. 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 to Return Loss Conversion Table. VSWR = Voltage standing wave ratio. 0 or the results don't mean anything!). At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. Load serial resistance and reactance ohm. However, convention and some literature quote return loss as a negative value akin to an S (1,1) measurement on a Network. As it can be seen from the above equation, VSWR is always a real and positive number with a minimum value of 1. Note that we have a VSWR calculator that will allow you to convert between VSWR, mismatch loss and return loss!. 9, half the power is reflected back. Return Loss to VSWR Conversion Chart. In one typical RF application, VSWR is. 0. Enter Your Values. You can calculate return loss when the VSWR is known. 5:1 정도로써 입력매칭이 거의 완전하게. 43 20. It is a measure of how efficiently RF power is transmitted from the power source, through a transmission line, and into the load. If you provide an email address I can share a system. These multiple solutions are possible because each contributor is a vector having both. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . 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. 1 Return Loss. A good VSWR to aim for is at least 1. 1) RL dB = 10 log P i P r. This fundamental concept determines S-parameters for multi-port networks, which calculate parameters such as return loss, VSWR, and insertion loss. 34:1 or a return loss of 16. IRA Calculator. VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). Result. VSWR (Voltage Standing-Wave Ratio) VSWR is the ratio of the maximum to minimun. 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. Lumped Quadrature Coupler Designer Enter the frequency of operation and system Z0. This calculator converts values between VSWR, Return loss, Reflection Coefficient and Mis-Match Loss. 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. The calculator is designed to be fine tuned after the initial input. Wavelength to Frequency. 25mW. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. 4 to 1. The term ‘forward power is synonymous with powered deliver to the load, or thru power. Print - Advertisement - A calculator designed to. A 2-port device has two distinctly interesting. VSWR. 5dB loss per 100 feet at 146 MHz). 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). 0:1, 2. 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. They are related but measure different aspects of signal performance. Return Loss to VSWR Calculator. For VSWR=2, reflection coefficient will be=1/3 and 20log (1/3) =-9. Where,. 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). Convert VSWR to Return Loss and vice versa. Click here to use the VSWR Calculator. Keep in mind that some calculators for RF have hard-coded units; if the label says (nF), for example. This is an online conversion tool for converting between VSWR, return loss and reflection coefficient, which are different ways to express how well a load is matched to a source. Return loss is when the transmitted signal is not completely. These parameters are often applied to antennas, RF filters and RF amplifiers such as LNA s and PA s. 39 0. VSWR / Return Loss Calculator. The low-pass filter often is a natural choice for lumped element filters. This mix of web-based tools and downloadable Windows software was developed to help engineers design faster and more accurately. Return Loss is a logarithmic scale, and Voltage Standing Wave Ratio (VSWR) is a linear scale. If you don't want to go through complicated equations to understand the relationship between VSWR, mismatch loss, s11/gamma and would like a calculator to do it for you, check out our VSWR. Return loss calculation EXAMPLE : VSWR = 1. Directivity and VSWR Measurements. Mixer Spur Search Calculate a list of mixer spurious responses for a set frequency plan. Wavelength Calculator. Poor VSWR can cause shadowing in a TV broa1) VSWR Calculation. This calculator is designed to give the efficiency loss of a given antenna, based on the input of VSWR (voltage standing wave ratio) and other subsequent factors. 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. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. Return Loss is the ration of the reflected signal to the incident signal. 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. ← Conducted RF Environments With Real RF Devices Vs. 4. 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. Note that the power handling calculation is based on controlled conditions, including a temperature of 25°C, sea level, and a still air (natural convection) environment. 6 Adding VSWR to the MixRG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. 333, a mismatch loss of 0. 1 Return Loss. spacing could be found. 02:1 VSWR VSWRHighSide of 1. This mix of web-based tools and downloadable Windows software was developed to help engineers design faster and more accurately. 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. 2. 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. The MAX2016 outputs the difference between the two power detectors. Given a certain level of heat generation within an assembly, thermal dissipation occurs through three primary mechanisms. For example, if you wish to input "25000000", just type "25M" instead. Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. A VSWR of 1:1 means that there is no power being reflected back to the source. Moreover, return loss is the relationship between both the reflection coefficient (Γ) and the. As an added bonus, the results are modifiable and can. Enter. As the VSWR increases, the quality of the match deteriorates and more power is reflected back. Please check for yourself using appropriate formula. VSWR. Insertion loss causes due to two factors namely ohmic loss, dielectric leakage and the return loss is caused due to mismatched systems. The equivalent VSWR is 1. Here Click here to learn more about VSWR. Return loss is always expressed in dB, which is a logarithmic scale. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Author: yuuki. RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. 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. 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. The easiest way to improve return loss is to add an attenuator. (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. Upon arriving back at the source, part of the reflected wave is coupled back. The first-factor ohmic loss is an unavoidable loss as it is a property of. Just enter the value and click calculate. Generally, both retur n loss and structura l return loss of a simple channel are calculated usin g equations that rely on characteri stic impedance and the impedance of the termination only [ 1]. Return Loss to VSWR. e. 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. This calculator computes the VSWR, reflection coefficient, return loss and matching loss in a transmission line. 5:1 정도로써 입력매칭이 거의 완전하게. 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. VSWR Return Loss Calculator. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. 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. Frequency to Wavelength. The usual function of a transmission line is to convey power from a source to a load with minimal loss. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. Lower VSWR is always desirable for a system. To calculate the Return Loss, add 1 to the VSWR and divide the result. VSWR is a measure of the reflected power on a transmission line. There is a mathematical equation to accurately calculate the VSWR of an RF system. 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. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. Formulas used: s r r. This table is particularly useful when designing antenna systems. VSWR-to-Return Loss CalculatorRF Calculators. VSWR. 1) (2. RETURN RETURN RETURN RETURN RETURN LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. LDF4-50A, HELIAX ® Low Density Foam Coaxial Cable, corrugated copper, 1/2 in, black PE jacket Halogen free jacketing non-fire-retardant (General propose cable for outdoor use only) Find a Partner. 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. Reflected power ratio for system 1 is 0. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet: Get Help. It is specified in dB. Low-pass lumped element filters. 010:1 ≤ VSWR Actual of 1. (GHz) Nut Attach Attach /Pin in (mm) in (mm) lb (g)A VSWR of 1:1 indicates a perfect match, meaning all power is being efficiently transferred, while higher values suggest mismatches and power loss. How to Calculate VSWR . Because of this, the effects of mismatch can be minimized by selecting an attenuator with the lowest possible VSWR. S. The calculator on this page helps determine the loss and that can be factored into the design or RF link budget. USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. 891: 6. 39 0. These reflections are very undesirable when we aim to transfer power from one. Cable impedance ohm. This calculator computes the VSWR, reflection coefficient, return loss and matching loss in a transmission line. 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. 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. . 51. 16-Feb-2022. RF Calculators. " – Dr. It is expressed in dB. 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. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. For example, if you wish to input"25000000", just type "25M" instead. 2. 01:1 to 3. 99 $ = 1-\Gamma^2$ 2. N -1 = previous stage. However, each field, when changed will allow. 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. Convert the VSWR value to a ratio by subtracting 1 from the VSWR value. Enter a value for VSWR (remember: VSWR should be a number larger than 1. Enter the source characteristic impedance and the load impedance then press "Calculate" below. 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. The VSWR Calculator is used extensively in RF engineering, telecommunications, and antenna design to optimize system performance, reduce signal loss, and prevent damage to RF equipment. October 20, 2022. 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. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. 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. 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. 4. This site comprises a comprehensive array of tutorials and related tools, including explanations, examples, references and charting. Typically, for field applications, the DTF Return Loss mode is used. offices email call. This calculator converts Return loss (RL) to Voltage Standing Wave Ratio (VSWR). 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. The VSWR is a measure of the matching of the antenna to the source and feeder cables. number) VSWR or % Reflected Power: MHz: a wavelength in inches or feet 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.