Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. ABOUT US. Referring to Figure 1 and Example 1 at the introduction of this paper, a 100 W transmitter is connected to a cable and antenna. 97dB. everything RF has aforementioned largest selection of online calculators for of RF and Microwave Industry. This is an online calculator that calculates Return Loss based on Reflection Coefficient. Enter a value for VSWR (remember: VSWR should be a number larger than 1. Choose Conversion Calculator or Table: Convert µV to dBm Convert dBm to µV Convert Watts to dBW Convert dBW to Watts Convert Return Loss dB to VSWR Convert VSWR to Return Loss dB Convert Reflected and Forward Power to VSWR Calculate Effective Radiated Power Calculate Effective Receiver PerformanceVSWR of 1. , if RL = 20dB, then calculate Rho = (10 ^ (20/-20)) = 10 ^ (-1) = 0. 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 Reflectometer Calculatorallows engineers to input any one of three known values, (Reflection Coefficient (p), VSWR or Return Loss), to . The first reflection back from each system will be the largest and subsequent reflections will be heavily attenuated, so we. The formula and equations used by this calculator are also provided. Return Loss to VSWR. This calculator converts Return loss (RL) to Voltage Standing Wave Ratio (VSWR). In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. total RF has the largest selection of online calculators for the RF and Micro Industry. This usually means that there is an impedance mismatch at the load. Return Loss (dB) VSWR:An online calculator for converting between VSWR and Return Loss, Reflection Coefficient, Mismatch Loss, and Reflected Power. 4 ms—500 forward and 500 reverse samples are collected on each cycle. While return loss analysis can be an ambiguous quality indicator, Distance To Fault (DTF) analysis highlights the problem clearly. 1) (7. This can be built into a FLEXI-BOX and a transmission line (50 Ohm track) PCB is available which easily adapts for this circuit with one simple trimming. Return Loss has surfaced in our ham world due to the new handheld antenna system analyzers like the Nano VNA and others. 500 1 Enter Reflected Power 4. Free online calculators. 54dB. everything RF has an largest selection of wired calculators for the RF and Microwave Industry. Formula. Radio Frequency Engineering Calculator. 5), which will give us 6. The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of. Showing 1 to 101 of 101 entries. 2 8. The calculator is a spreadsheet that accepts VSWR specifications for all the components in your RF Path—tower mounted amplifiers, diplexers, bias tees, etc. These parameters are often applied to antennas, RF filters and RF amplifiers such as LNA s and PA s. 002 respectively as shown in table-6 for the notch width, g=1. Expressed as 3. 0 or the results don't mean anything!). The VSWR monitoring system consists of an ADC for real-time measurements. It including shows one percentage from forward to reflected power. VSWR to 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. In an ideal RF system, all of the energy from the RF source is transferred to the load. 8 is 80%, or -0. Total Cable Assy Loss: (dB) Click link at right to calculate:. 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. Some are based on look-up tables, some completely hide their algorithms. 3. VSWR. Note the same numerals are used with just a shift in the decimal point. Home Pubs. These calculators help with unit conversions, VSWR calculations, attenuator design, antenna design, radars, and various other basic calculations that are often required. The reflection coefficient is calculated from the VSWR and used to compute the mismatch loss in dB as shown below. In addition, if GAMMA, VSWR, or dB is known, the calculator can convert between the three. Conclusion : In summary, RL and VSWR formulas and calculators are valuable tools that enhance the efficiency. 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. Return Loss (dB) 3. 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. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. The equivalent VSWR is 1. An antenna’s Return Loss is a figure that indicates the proportion of radio waves arriving at the antenna input that are rejected as a ratio against those that are accepted. To calculate the Return Loss, add 1 to the VSWR and divide the result by the VSWR minus 1. 091) (0. High VSWR values indicate less efficient power transmission and can lead to significant. VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. voltage standing wave ratio 020710. 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 antenna after this. A network analyzer can be used to make S parameter measurements. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. A good VSWR to aim for is at least 1. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, Γ (dB) (%) (%) 1 17. A VSWR value of 2 or under is typically acceptable for antennae in communications systems. It's assumed that the source impedance is also complex. 2:1 (or simply 1. Return loss can be measured by using microwave and RF test. Now VSWR is 1. Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). 01:1 to 3. If you don't have Excel you can. 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. 01. 778. This is an online calculator is calculates VSWR based on Return Loss. 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. 1-800-761-3041 Contact Account Cart Search Waveform. 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. 979Return Loss (dB) Calculates Return Loss -13. Mismatch Loss: Convert VSWR to Return Loss, Reflection Coefficient, and Mismatch Loss with our easy conversion calculator. 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. VSWR and Return Loss Calculations. Understanding the role and implications of impedance in RF transmission lines and antennas is vital to successful system performance. Other components in a transmission line system contribute to small reflections of the RF power. SFDR Visualizer Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. reflection coefficient definition. applied return loss and RF power, measured at 1 GHz. Measure the magnitude of the wave voltages at the coupled and isolated ports. 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. 44. 0 dBFor our measurements we replace the antenna with a 50 ohm termination (vswr 1. 0:1 indicates perfection (there is no standing wave). Upon arriving back at the source, part of the reflected wave. If system 1 is a cable, then it's between 8 and 14dB. For VSWR=2, reflection coefficient will be=1/3 and 20log (1/3) =-9. For reference, 20 nanoseconds equals about 4 meters. Click here to use the VSWR Calculator . 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. Title:. Result. The VSWR value should be close to 1. cdn-anritsu. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). With this table, engineers can quickly. 1) (2. 1 Return loss in dB = 26. 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. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. VSWR to Return Loss Conversion Table. VSWR to Return Loss. Then, take the logarithm base 10 of the result and multiply it by 20. There is also a selection of suitable connectors. See full list on allaboutcircuits. 4. and VSWR can be calculated using the equation: Test Results. 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. LM = Matching loss in decibels Example . 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. 1) Enter the required input and output impedance and the required attenuation then press "Calculate" below to obtain the Ideal. 5:1. 0 Frequency (GHz) Return Loss (dB) Return Loss (dB) Figure 5 A VSWR plot, to the uninitiated, can be a very confusing plot. This impedance mismatch can be with a device inserted in the line or with the terminating load. The relationship between these two variables is not linear, meaning that each point on the table must be determined separately. If the power incident on a load is Pi P i and the power reflected. 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). 155 dB. It’s typically expressed in decibels (dB) and calculated as the input power minus the output power. 9, for system 2 is 0. 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. As an added bonus, the results are modifiable and can calculate the other values. 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. 9, for system 2 is 0. Convert VSWR to Return Loss, Reflection Coefficient, and Mismatch Loss with our easy conversion calculator. What effect does DC current through the main-line have upon performance? A. For example, an antenna with a VSWR of 2:1 would have a reflection coefficient of 0. 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. The Reflection Coefficient can be calculated. The VSWR is an important measure of the quality of a radio antenna system. com Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. It uses the Voltage Standing Wave Ratio VSWR to first calculate the reflection coefficient Γ . A table of convenient values are presented at the bottom. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. s. If you provide an email address I can share a system. 43. Return Loss Calculator: RF-Calkulator: Single Layer Air Core Inductor Design, ON4AA: Sophisticated Helix Antenna Design: The Quarter-wave stub, LA8OKA: Types of Coax Cable and Line Loss: The self-inductances are calculated: VSWR calculator: VSWR Loss Calculator: VSWR to return loss conversion: Waveguide Slot Antenna Calculator,. In Figure 14, the ADL5920 is being used to measure the return loss of the load, also at 1 GHz. The return loss at that point has degraded by approximately 5 dB. Reflected power ratio for system 1 is 0. Mismatch loss. Calculate. Calculate the VSWR and Reflection Coeffecient on the parameters you enter using Elite RF's Calculator. A simple, user-friendly RF / Microwave matching calculator that easily matches S1P and S2P files. . 0 15. The table below converts between VSWR, return loss, reflection coefficient, mismatch loss, reflected power and through power. If VSWR is known, then the reflection coefficient (Γ), return loss (RL),. Archive Documentation Data Software. Lower VSWR is always desirable for a system. 54 dB (11% of your transmitter power is reflected back). The Return Loss on the other hand deals usually with the voltages and is used in the VSWR measurements, either manually or through the instrumentation. Our results are optimised for gain, but others may be optimised for bandwidth. 1 and VSWR = 5, which yields the required value p = (1 – 5q)/5 = 0. 4300 | info@markimicrowave. 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. Therefore, a VSWR of less than 1. The component is said to have a loss of 25 dB. In logarithmic terms, the formula for return loss is given as: Even if the measured reflection value on the VNA is -25dB, the negative sign is ignored when representing return loss. However, each field, when changed will allow. Noise Figure & Noise Temperature Calculator pop-up . USA CHINA MALAYSIA INDIA ISRAEL UNITED KINGDOM. A network analyzer can be used to make S parameter measurements. Return Loss is a measure of the amount of energy that is reflected back at a discontinuity in a Radio Frequency Circuit . All of the power is reflected back. 0. Just enter the value and click calculate. 79. These results are displayed 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 [1, 2] RLdB = 10 log Pi Pr (7. 500VSWR Calculates VSWR 1. Return loss decibel is mostly read by the the antenna analyzer test equipment. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). 43 20. This can and online calculator that calculates VSWR based on Return Loss. It is expressed in dB. This formula is used to calculate the VSWR from the given return loss. The ratio of the maximum to minimum voltage is known as VSWR, or Voltage Standing Wave Ratio. 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. 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. We can then find the return loss as -20 * log(0. Author: Marki Engineering Created Date: 11/24/2009 10:57:28 AM. Search for: Components MenuNote that the Insertion Loss is typically low in the desired band of frequencies, and the Return Loss is high. 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. Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. 333, a mismatch loss of 0. -30-25-20-15-10-5 0 0. Matching Pi Attenuator Calculator. With the initial values in place, you need only click on Calculate. Loss factor. directly calculate and display the resulting VSWR value. 5. The ratio of the input to the reflected signal is called the Voltage Standing Wave Ratio (VSWR). com +1 (718) 934 4500 +1 (800) 654 7949. 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. This is known as mismatch loss. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. They are related but measure different aspects of signal performance. LR = Return loss in decibels. Next, plug in the calculated return loss value into the formula VSWR = (1 + 10^ (RL/20))/ (1 - 10^ (RL/20)). Now, let us investigate the physical meaning of return loss. Return Loss (dB) VSWR. Measure S11 across the desired frequency range. VSWR - Return Loss - Γ Conversions These are the standard set of equations for converting between VSWR, return loss, and reflection coefficient (Γ). In the real world, a VSWR of 1. Return Loss to VSWR. Γ = (VSWR – 1)/(VSWR + 1) Return Loss (dB) = -20*Log 10 (|Γ|) Mismatch Loss (dB) = -10*Log 10 (1. VSWR to Return loss calculator. I'll keep it short: Yes, the computation of: $$Gamma=frac{Z-Z_0}{Z+Z_0}$$ can be properly composed in the way you suggest. function doValidate_3 form { window[ cff_enabling_form ] = functi. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. How to improve the Return Loss of an amplifier. 727 p asternaom VSWR, Return Loss and Transmission Loss vs Transmission Power VSWR Return Loss (dBm) Trans. 02 (51/50) which produces a return loss of 39 dB, an improvement of 13 dB over the 55-ohm termination. 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. There is also a selection of suitable RF. g. P%REF = (VSWR - 1)² / (VSWR + 1)² x 100. This is an online numeric that calculates VSWR based on Return Loss. 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). This calculator is used to calculate the uncertainty of gain for any active RF device (mostly amplifier) that occurs because of the impedance mismatch. frequency graph of the above assembly is shown in figure 5. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. The result is an antenna VSWR or return loss measurement corrected for cable loss. 57. 4. For a VSWR of around 5. Mismatch Loss (dB) 3. From a certain perspective 'Return Loss' is a misnomer. VSWR. 미스매칭 환산표 ( Return Loss - VSWR ) 고주파 회로에서의 정합성은 Return Loss(반사손실)이나 VSWR(Voltage Standing Wave Ratio, 전압정재파비)로 표시한다. 1, for system 2 is 0. This indicates the effectiveness of the coupling, and that a large part of the energy is transmitted to the antenna with very little reflection. 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. This test can be performed in the DTF Return Loss or DTF VSWR mode. 6dB. How to Calculate VSWR . 30 MB. Return loss vs. 1 Return Loss. Note that it blows up at the lower cutoff frequency of 6. 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. e. 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. 0 10. The formula for mismatch loss is simply: mismatch loss= (1-|Γ| 2) alternatively, mismatch loss=1-ρ 2. 98dB = 96. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. VSWR ( VSWR meaning Voltage Standing Wave Ratio) is an important concept in radio frequency (RF) engineering. 891: 6. Transmission Power. 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. 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. comOnce the VSWR is known, return loss can be calculated as follows: Return Loss = 20 ∙ log10 () Generally, a higher return loss value is preferable. 707. Return Loss or a VSWR: return loss (dB) (evaluated as neg. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. Reflection Coefficient. 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. Return loss is a measure of how well devices or lines are matched. Learn about voltage standing wave ratio (VSWR), return loss, and mismatch loss, which helps characterize the wave reflections in a radio frequency (RF) design. Return loss and VSWR are two important measures of efficient power transmission and both of them can be interconverted to obtain the value of one another. The return loss is the ratio of the power of the. 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. Channel Emulators/Simulators. The losses are due to copper losses/skin loss and for more esoteric antennas (planar types) it's usually dielectric loss. 2 8. Marki Microwave's Tools is a collection of free online applications for RF analysis and synthesis that are easy to use and mobile-friendly. 5:1 VSWR that appears on. RF insertion loss is the reduction in signal power as it passes through an RF component or system. The path loss that might be measured in a system however will not be this. 50 = -13. Requires Windows 7 (64 Bit) or higher. 8 GHz marks. voltage standing wave ratio. A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line LOGIN. Now, let us investigate the physical meaning of return loss. At small VSWRs, the plus and minus. Convert VSWR to Return Loss and vice versa. As the VSWR increases, the quality of the match deteriorates and more power is reflected back. Elite RF. Calculations Pathloss / RSSI; Missmatch Loss; IP3 / SFDR Calculator; IP3, IP2, 1dB Comp. 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]. But it is more complicated. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1]. Return Loss to VSWR Calculator. dBm to Milli Watts Calculator. The lower the VSWR is, the better the antenna is impedance-matched to the transmission line and the higher the power delivered to the antenna. vswr Excel calculator. The reflection coefficient is also known as s11 or return loss. 43 20. 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. 000Match Efficiency (%) Calculates Match Efficiency. Avg. Most Mini-Circuits' couplers have their ports at DC ground. 9. Coupling to Direct Line Insertion Loss Conversion Table for Directional Couplers. . It also shows the percentage of forward to reflected power. Equitable enter the value and click calculate. 4 GHz and 5. 34:1 or a return loss of 16. VSWR is defined as the ratio of the maximum voltage to the minimum voltage in standing wave pattern along the length of a transmission line structure. Qorvo Interactive Tools & Calculators. Reflection. Calculators. It is expressed in dB. VSWR: RL (dB) 1. To generate the table, engineers must measure the VSWR for a range of frequencies and then calculate the return loss. The reflection coefficient is also known as s11 or return loss. Directivity and VSWR Measurements. This is equal to a return loss of 14 dB or greater. dBm To Watt Calculator; Noise Factor to Noise Figure Calculator; Noise Temperature to Noise Figure Converter;where RL(dB) is the return loss in dB, Pi is the incident power and Pr is the reflected power. To help the engineers conducting VSWR sweeps, Lou developed the PIM and. This calculator converts between return loss (RL), voltage standing wave ration (VSWR), and reflection coefficient (Γ). An online calculator for converting between VSWR and Return Loss, Reflection Coefficient, Mismatch Loss, and Reflected 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. There is an equivalent definition for VSWR, which can also be expressed in terms of the Return Loss (RL). Determine how to calculate the effect of VSWR on Return Loss Understand the applications for the equation of VSWR on return loss in electronics When creating PCB prototypes that conduct alternating current (AC) at radio frequency, designs must compensate for the effects of the current waves on the prototype material. everything RF has the largest selection of buy calculators for the RF and Stove Industry. 2%) = ±3. Measured return loss vs. This is an online calculator that calculates VSWR based on Get Loss. The calculated value is MUCH worse. This ratio can also be measured in dB, and expressed as Return Loss. As a result, you have a range of either plus or minus uncertainty. ZoReturn Loss = incident power/ reflected power. It turns out that -13. 3 dB. $endgroup$ – Neil_UKThis general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. Calculates will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. These reflections are very undesirable when we aim to transfer power from one. S22 would be the reflected power radio 2 is attempting to deliver to antenna 2. The calculator is designed to be fine tuned after the initial input. Conversion Formulas. This VSWR calculator will calculate return loss, mismatch loss, loss in percentage and the reflection coefficient. Return loss is related to both standing wave ratio (SWR) and reflection coefficient (Γ). A power sensor with a return loss of –23 dB is connected to a calibration source with a return loss of –20 dB. 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. 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. CF 210 Cable Loss; CF 300 Cable Loss; CF 500 Cable Loss; VSWR Calculator; Waveguide Gasket Selection; Photos. When someone says that the antenna is poorly matched, very often it means that the VSWR value exceeds 2 for a frequency of interest. In order to improve the VSWR, this calculator also has an extra input for adding an attenuator to improve or reduce the system VSWR. VSWR =. 1 Return Loss. VSWR Calculator: This is the ratio of maximum voltage to minimum voltage in standing wave pattern.