c is the speed of light 299,792,458 m⋅s −1,. On the two smaller coils, a small piece of heavy cardboard holds the coax in. D D = coaxial cable outer diameter. The operation of this. Jul 09, 2003 · Coax Cable Loss. λ = Wavelength. The length of the coaxial cables is 29. . 04 feet = (246 x . S. The coaxial cable is so fundamental that Oliver Heaviside patented it in 1880, just a few years after Maxwell published his famous equations. 0 at Check Nearby Stores. 854187817620. thus a big transmission line can have the same impedance as a small transmission line if one is scaled in proportion from the other. Brown part is the copper itself. Altium's built in impedance calculator shows the trace impedance at 34 ohms not 50 ohms. 850c-0. ε 0 = 8. MEDIUM VOLTAGE SHIELDED CABLE PARAMETER CALCULATOR. 2. the built-in transfer impedance calculator, which extracts the impedance from the geometric characteristics of the shield. Wi-Fi 7 will enable consumer, enterprise, Industry 4. So for the special case of a quarter-wave section where you can pick the transmission line impedance, this is how you can match two. This tool is designed to calculate the inductance of a coaxial cable if its dimensions are provided. Note that the very first dip is where the cable is less than 1/4 wavelength. Coaxial Cable Impedance Calculator allows you to enter the Outer Diameter Dielectric width, Inner onductor Diameter width and either the Dielectric Constant or Velocity of Propagation (VoP) values in order to calculate the impedance of the coax. If it's safe to assume that both drivers have an output of the same amplitude, we can even calculate the loss introduced by the cable: 20×log(1. Since we might as well find the impedance per length, we can study the expression: Rl = 1 σA R l = 1 σ A. A Coaxial cable is a type of cable that is used to make transfer RF/Microwave signals. The coax cable is RG-8X. For coaxial cables the characteristic impedance will be typically between 20 and 150 ohms. LOGIN. SMA Connectors are 50 Ohm RF Coaxial connectors that operate up to a 18 GHz. Z0 = Characteristic impedance. The Velocity of propagation (Vp) of a cable is the speed at which an electrical signal can propagate through the cable in comparison to the speed of light. Micro Coax & Twinax Cable Specifications 20Ω Coax Cable – 26 AWG 50Ω Coax Cable – 34 AWG Ω Coax Cable – 36 AWG50 Ω Coax Cable – 38 AWG 85Ω & 100Ω Twinax Cable – 30 AWG 85 Ω & 100 Twinax Cable – 32 AWG 75Ω Coax Cable – 38 AWG 100Ω Twinax Cable – 30 AWG Board-to-Board Assemblies = Eye Speed ® Coax = Eye Speed Twinax. Just look at the power handling at 60 ohms - below 50%. You can perform the calculations, but by changing the outer diameter in Figure 3 by just two millimeters, you will find that the coaxial cable’s impedance changes from 75 ohms to 46 ohms. When the cable is loaded with plastic, the C increases, but the L does not, so speed and impedance change from those in the same size air-spaced cable. A Rectangular Waveguide is a conducting cylinder of rectangular cross-section used to guide the propagation of waves. Telegram. The tool provides two networks that will have the desired impedence at that frequency, but their. In summary, the design process for the coaxial probe placement is simple: Select an operating frequency and stackup. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. This frequency to wavelength calculator helps you determine the wavelength of a waveform based on the frequency. The cutoff frequency is the frequency up to which the system functions efficiently. 3pF) in the tuner to 111. If the antenna feedpoint is 50 ohms (such as a gamma match of a beam antenna) using 75 ohm coax as the main. e. 50 Ohm coaxial cables are used in microwave transmitters, translators, FM low power systems, ham frequency systems, and two-way radios. The deterioration of Kr above 8 MHz is spectacular. 5 mm Coaxial Connector a very common connector type, which is why there are a plethora of 3. × 10 −12 F/m is the. ε = dielectric constant = ε0 * εr. Bend Radius is the minimum radius that a Radio Frequency (RF) coaxial cable can be bent to without damage. Using our own calculators which, for impedance, is based on the formula above (which is the same as the calculator in the tool section of this site) our characteristic impedance turns out about 8% - 10% higher than calculated. ε 0 = 8. ,100 % power transferred from a source to a load via a transmission line/cable). VSWR = Voltage standing wave ratio. C = Speed of light. L L = length of the coaxial cable. . MEDIUM VOLTAGE SHIELDED CABLE PARAMETER CALCULATOR. Coax Impedance Calculator. Since a coaxial cable must be terminated at both ends of the cable with resistances equal to the cable Characteristic Impedance to prevent reflections from impairing the picture, SDI and Video signal sources must have an internal source. The fabrication procedure for slot lines is the same as that for microstrip lines. This example is for LMR-600 which is very low. Where, f c = Cut-off frequency of rectangular waveguide in GHz. If there is an insulator around the wire then this. 850c-0. (D) is the outer diameter of coaxial. If you would use different values, the signal would reflect and distort itself. Now, let us investigate the physical meaning of return loss. R = Zo (K + 1/K) Where, K2 = P3 / P2; (P3 - power at port 3) (P2 - power at port 2). DX Engineering Coaxial Cable Reference Chart LMR-240 50 ohm Cable LMR-240 Ultraflex 50 ohm Cable LMR-400 & 400 DB 50 ohm Cable LMR-400 Ultraflex 50 ohm Cable Indoor/Outdoor Peak Power 5. 8 Ohm, Inductance (L) = 2. Distributed Inductance (L') For a coaxial cable, the inductance per unit length L' in henries per meter (H/m) is defined as. I leave it to other sources to provide the complex equations needed to precisely model coaxial cables. In summary, the design process for the coaxial probe placement is simple: Select an operating frequency and stackup. Over time properties of standard coaxial type cables have been standardized. SIC = Dielectric constant of the cable insulation (Table-3) = cthe speed of the voltage/current signal on the cable is the speed of light. First one is how to calculate the impedance of an equilateral patch antenna and. Our RF and microwave calculators and converters will provide the figures you need for your radio frequency engineering needs. With the conductor sizes (diameter of the inner and outer conductors) and relative permittivity as parameters, this tool calculates not only the coaxial line impedance but also the capacitance and inductance per meter, the RF cutoff frequency and the length of a 1/4 wave transformer sub taking into. the combined velocity factor will be around 0. ) using the high and low frequency approximations. Our RF and microwave calculators and converters will provide the figures you need for your radio frequency engineering needs. fc = Cutoff frequency. 25 provides minimum signal loss at about 50 ohms and at the same time it can carry large power for a given. Pasternack RG178 flexible coax cable is 50 Ohm and has a PTFE dielectric. 5nF. . Identify as much information as you can about your piece of cable prior to discussion: Characteristic impedance. 035 in), outer conductor diameter 3. This can be achieved by regulating the inner and outer diameter of the coaxial cable, along with the. See Figure 2. . the cable is Tensolite (Carlisle) brand (came all the way from USA, not China) came already with BMA connectors soldered on both end. First remove the coax outerExample: Calculate the distributed capacitance and inductance, impedance and a cutoff frequency of a coaxial cable RG-58 with the following characteristics: inner conductor diameter 0. The choke balun usually does the same thing as a regular 1:1 current balun but adds the high impedance path to the common mode currents too. Visit to learn more about our other electrical engineering tools. Where: Z = the 1/4 wave coax line impedance, Zr = terminating resistive impedance (antenna) ( input resistive impedance as read on the RF impedance bridge at the end of the 1/2 wave line). Select the cable type from the available options. These calculations for Pout (Power out in watts) are for an input of 50 watts. ε0 = permittivity of free space = 8. Where, Np/Ns = Turn ratio. Characteristic Impedance Calculation For Typical RG58U Coaxial Cable The plots below show the characteristic impedance Zo for a coaxial cable with typical RG58U characteristics (cables from different manufacturers differ somewhat in the exact physical dimensions, dielectric constants etc. MiniVNA or MFJ-269 or similar). Transmission Line Details by Dan AC6LA. Plugging this into the equation we calculate the cable length. 7mm. Coaxial characteristic impedance calculator. where. This coaxial cable cutoff frequency calculator that helps the user to calculate the cutoff frequency of a coax cable based on outer and inner conductor. Kenneth L. 1312. Return loss (RL) is the ratio of the reflected power to the incident power, in decibels (dB). These connectors have screw type coupling mechanism which minimizes reflections and attenuation by ensuring uniform contact. 25 inches. VSWR Conversion Table. Note that in the case of a dipole with an approximate feedpoint impedance of 70 to 75 ohms, fed with RG-6 or other 75 ohm coax, only one 75-to-50 ohm 12th-wave transformation is needed, at the shack entry end of the feedline. I might add that if you're looking to calculate the electrical impedance of a circuit, they have a separate impedance matching calculator and a PCB impedance calculator for various PCB-mounted conductors. 1. Formula for Antenna Near Field & Far Field Distance Calculator. An example of a wire microstrip might most often be found in prototypes or reworked boards where a wire is used over the top of pcb or copper clad material. Picking it interactively in the 3D view and. Lcoax ≈ μ0μrL 2π ln( D d) L c o a x ≈ μ 0 μ r L 2 π l n ( D d) Where: Lcoax L c o a x = inductance of the coaxial cable in henries (H) μ0 μ 0 = permeability of free space = 4π×10 −7. Coaxial Impedance Calculator. The use of a standardized impedance makes RF design much more practical and efficient. 85419 x 10. Calculate the edge input impedance for the antenna. The Pi attenuator consists of one series resistor and. The "trick" to doing the multi-dielectric calculation is to note that capacitance of multiple concentric. A quarter wave transformer is used to match two transmission lines with different impedances. Scroll down to find formulas for determining attenuation, wavelength, characteristic impedance, time delay, and more. . In the limiting case of infinite load impedance, theBecause a coax operates in TEM mode — with the electric and magnetic fields normal to the direction of propagation along the cable — modeling a 2D cross section suffices to compute the fields and the impedance. Calculate the impedance of a coaxial transmission line. Example. Formulas. 035 in), outer conductor diameter 3. Picking from the CST Cable Studio Segments Navigation Tree. Geometriy is not that critical. Summarizing: The power handling capability of coaxial transmission line is optimized when the ratio of radii of the outer to inner conductors b / a is about 1. Get. D1(Inner Cable Diameter):. 2, the following formula can be used: Zo = 138 * log10 (D/d) / sqrt(εr) where Zo is the characteristic impedance, D is the diameter of the outer conductor, d is the diameter of the inner conductor, and εr is the relative permittivity of. Coax Inductance Description. Suitable for VHF (~1. If that transmission line is 1/4 wave long, it's called a quarter-wave transformer, and it makes whatever's at the end of it look like the conjugate impedance. f if the frequency of the RF signals. c is the speed of light 299,792,458 m⋅s −1,. Figure 4 shows calculated results on a 5m long good quality single braid coaxial cable, 1 meter above ground, with perfect 360° contact at connector backshell. Conformable Cable. This calculator calculates the impedance of a coaxial cable. The Smith Chart graphically maps S11=reflection coefficient= (ZL-Z0)/ (ZL+Z0) to Load Impedance (ZL), normalized to Z0 (source impedance = center of chart). D is the inside diameter of the coax cable shield,. How is the turn ratio calculated? The turn ratio of the RF transformer is calculated by using the following formula. Figure 3. This is the only way to calculate the total impedance of a circuit in parallel that includes both resistance and reactance. 1. 035 in), outer conductor diameter 3. where. The formula for the length of the matching section is as follows: Q-Match Coax (in feet) = 246 x [velocity factor] / Frequency (MHz). Wall Thickness Calculator; Glossary of Aerospace Terms; Guides and Product Information;. Maximum Operating Voltage (Vrms) 4000. The first plot shows the Impedance in Cartesian form, the second the absolute Value of Impedance and the third the Phase. “468” is the constant used to convert frequency in MHz to feet. It is the output connection that determines whether a choke is a balun or unun. The coax cable has a capacitance as a result of the gap between inner conductor and outer shield of the cable. I leave it to other sources to provide the complex equations needed to precisely model coaxial cables. Calculate the impedanceCharacteristic Impedance (Zo) 50 (±2) ohms. For this calculation the diameter and length units are in cm. a = outside radius of inner conductor (inches) b = inside radius of outer conductor (inches) c = speed of light in a vacuum = 299,792 km/s = 186,282 mi/s. 96. The input impedance of such a dipole is typically less than 50 ohms and may have a reactance. 95 metersA microstrip width calculator can calculate the width of a microstrip. ) using the high and low frequency approximations. In most test instruments, the signal outputs present a 50-O output impedance while the instrument inputs present a 50-O. 1312. 5dB loss per 100 feet at 146 MHz). 66 and 0. The cable length is 3. Models have been created to approximate the characteristics of the coax cable transmission line. Gamma matching is the most commonly used matching device used for a planar dipole in the Yagi-Uda antenna. 66 and LMR-240 has a Vf of 0. The distance between the first two dips (deltaF) is 99 MHz. This means the cables need to be. COAXIAL CABLE IMPEDANCE CALCULATOR Calculates the characteristic impedance of a coaxial cable given its dimensions. A typical coax cable has 50 ohm characteristic impedance above about 1 MHz but that doesn't mean that's the impedance that the source sees because, if the load isn't 50 ohm then the "seen" impedance isn't 50 ohms and reflections will be present. Most professional engineers and technicians will never have the need to calculate the capacitance, inductance, or impedance of a coaxial cable since they are usually. The measure of this reflected power is called as return loss. 232 Ohm/1000ft (761 Ohm/km) 14. The above formula is another form of the familiar equation: Z (squared) = Zo X Zr. 295+j32. It include antenna gain calculator, Antenna G/T ratio calculator, coaxial cable Impedance calculator, Noise temperature to Noise Figure Converter, Radar Range Calculator, resonant frequency calculator, wavelength to. - Example: 2nd mode in coaxial cable is a dipole TE 11-mode - This dipole mode changes polarity twice around cable circumference - Approximation: Use average circumference 11= =𝜋∙ + 2 - In coaxial line the TEM-mode is the dominant mode - The corresponding wavelength equals the cable circumference C, but at which radius? 11= vpoint along a transmission line with a general load impedance. R = l σA R = l σ A. and Canada (866) 727-8376 International +1 (949) 261-1920Another way to measure the characteristic impedance of coax cable is to measure its inductance and capacitance per unit length; the square root of L divided by C will be in ohms (not farads or henrys) and will be equal to the characteristic impedance. The following calculator computes the resistance, inductance, inductive reactance, capacitance, charging current, and surge impedance for medium voltage shielded power cables. These features make the 3. The cable dictates how much current initially flows based (mainly) on its inductance, capacitance and resistance. D is the inside diameter of the coax cable shield,. Transmission line impedance is an important aspect of RF electronics, as it greatly influences the quality of a signal. As can be seen in the following graphs, the only time a 1:1 choke-balun accomplishes a 1:1 transformation is when it sees 50 ohms at its output. 36Ω), the impedance is: Transformed through 25 feet of RG-8 coaxial cable to 111. The RG-8A/U is a 50-ohm coaxial cable with an outside diameter of 0. The capacitance value varies with the spacing of the conductors, the dielectric constant, and the impedance of the cable. The RG-6 cable I used had a velocity factor of 66 percent. This online reflection coefficient to VSWR calculator calculates the VSWR by entering the reflection efficient Γ (= value between 0 & 1). 9913 and LMR-400 are popular “low-loss” RG-8 types. 35dB. × 10 −12 F/m is the. Suitable for VHF (~1. frequency: f = DC - 100Hz f = 1kHz f = 100kHz Zo: Zo = R G Zo = L C Zo = R ωC Zo. For any cable type, it is equal to the reciprocal (1/x) of the square root of the relative permittivity of the cable’s insulation. Suitable for higher power (~1800 watts) at HF. Executive Summary. To use the calculator, select the type of RF cable type and enter the outer diameter. The Smith Chart graphically maps S11=reflection coefficient= (ZL-Z0)/ (ZL+Z0) to Load Impedance (ZL), normalized to Z0 (source impedance = center of chart). It’s simply defined as the process of making one impedance look like another. 86 mm] x 0. 8 ns. The length of the dipole is usually one-half of the wavelength of the RF signals. 8542*10^ (-12). d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,. For example, if you wish to input "25000000", just type "25M" instead. a = outside radius of inner conductor (inches) b = inside radius of outer conductor (inches) c = speed of light in a vacuum = 299,792 km/s = 186,282 mi/s. Here are the coax topics covered on this page and other related pages: Coax overview. RG12 Coaxial Cables are a type of coaxial cable commonly used for high-frequency signal transmission in telecommunications and networking applications. 7 - 29. coax cross section. cally short cables, these answers can be very different. The Reflection Coefficient can be calculated from return loss by using the following formula. 50 Ohm Coax Cable. 6 . Attenuation (dB/100 ft , @ 400 MHz). 035 in), outer conductor diameter 3. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. From my memory, cable splitters (such as for splitting a cable tv coax cable into two televisions) provide impedance matching to prevent signal reflections, etc. where. 1. Model # Y278784 SKU # 1000724874. Micro-coaxial cables. This may not seem much of a loss but look at the Power Compensator again and you will see that 100w from your transmitter would have to be increased to 108. Coaxial cable characteristic impedance Calculator and formula. d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,. d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,. The impedance of a coaxial cable is a critical parameter that characterizes its electrical properties. Disconnect both ends of the cable from their connections. These cables would also span long distances, reaching hundreds of miles. The velocity of propagation along the wire is 2x108 m/s. A Folded dipole antenna is a half-wave dipole antenna with an additional parallel wire or rod connecting its two ends and folded to form a cylindrical closed shape. This calculator is designed to calculate the characteristic impedance of a microstrip - a flat conductor suspended over a ground plane with a dielectric between them (see diagram below). 9 Ohm/km) 29 pF/ft (95 pF/m) 50 Ohm 70% Voltage UL Voltage Rating Voltage Rating 30 V (UL AWM 1637) 750 V (Mil-Spec) Mechanical Characteristics. $endgroup$ –RG316 Coax Cable. The length of the dipole is usually one-half of the wavelength of the RF signals. This online reflection coefficient calculator calculates the reflection coefficient (Γ) by entering the value of the characteristic impedance Z o (in ohms. We at everything RF have developed a RF Connector Frequency chart that can be used as a reference chart to tell you the max frequency (cutoff frequency) of each connector type. The impedance of this antenna is around 300 Ω, so you may want to use a 4 : 1 transformer or a λ/4 long piece of 150 Ω coaxial cable to match this impedance to 75 Ω. MiniVNA or MFJ-269 or similar). 49 m. d d = coaxial cable inner diameter. R ≈ l σ(δs2πa) (δs ≪ a) The impedance of a wire of length l and radius a ≫ δs is given by Equation 4. This topic describes a technique for calculating the impedance of a waveguide. I've added the formulae to my answer. Location. ε 0 = 8. Choose from 50 Ohm, 75 Ohm, 93 Ohm and 95 Ohm impedance coaxial cables or 78 Ohm and 100 Ohm impedance Twinax cables. The reason for this approach is due to the behavior of real electrical signals on a transmission line. ε0 = permittivity of free space = 8. In the case of coaxial cables, impedance is expressed in terms of "ohms impedance". 4. 3. We have a conflict in statements here where formula 6. 718. As we know that the definition of the return loss of a system is the ratio of incident power to. Permeability (µ) is assumed to be 1. Technical Recap: Coax feed line chokes all have unbalanced input and either balanced (BALUN) or unbalanced (UNUN) output. e. Γ = Reflection coefficient. For this example, assume perfect conductors and a lossless dielectric with relative permittivity ε r = 2. See full list on allaboutcircuits. 5 mm Coaxial Connector is designed to be relatively rugged. Coax velocity factor of popular coax cable types is published in many places. Also known as RG-400 or RG400 cable, this premium coaxial cable is designed to meet the demanding requirements of high-frequency applications. Example: Calculate the distributed capacitance and inductance, impedance and a cutoff frequency of a coaxial cable RG-58 with the following characteristics: inner conductor diameter 0. Brown part is the copper itself. The area just becomes the effective area, so for the inner shell, 2πaδ 2 π. Impedance mismatch of 75 Ohm Cable. The capacitance of a one conductor shielded cable is given by the formula below: Where: C = Total capacitance of the cable (microfarads) I charge = Charging current of the cable. Micro-coaxial cables. This applies to generalized S. Gamma matching allows you to match such a dipole with a 50-ohm coaxial feeder. For the cost, ladder line has lower loss than coax. c is the speed of light 299,792,458 m⋅s −1,. Generally, a wave is reflected back. 124 in), type of insulation is polyethylene with the relative permittivity of 2. Email. The length of a half-wavelength dipole can be calculated by the given formula: L =. 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 calculations and RF conversions include metric-standard, link budget, coax cable, power, attenuation, frequency and many more. Now it's time to look at the generic formula for α D: We plug in Gprime and Z 0 into this and get attenuation in Nepers /meter: If. The following calculator computes the resistance, inductance, inductive reactance, capacitance, charging current, and surge impedance for medium voltage shielded power cables. Z 0 = Characteristic Impedance of the overall system. This calculator is able to calculate the impedance, delay, inductance, and capacitance of a coaxial cable. The formula is this: -. Calculation of complex impedance. The term coaxial refers to the inner conductor and the outer shield. A-INFO carries hundreds of RF cables all in-stock and available for same-day shipping worldwide. 854187817620. “Inductance Calculations” , F. The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. Example: Calculate the distributed capacitance and inductance, impedance and a cutoff frequency of a coaxial cable RG-58 with the following characteristics: inner conductor diameter 0. The loss tangent introduces a "real" conductance which is calculated from the susceptance by multiplying by loss tangent. 405 inches and a voltage rating of up to 1000 Vrms. HELP. Coax Impedance Calculator. This coaxial cable calculator determines the distributed capacitance and inductance of a coaxial cable, its impedance and cutoff frequency for a given cable geometry, and relative permittivity or velocity factor. . The Smith Chart achieves this by superimposing a grid on S11 that maps load impedance. Among the commonly used connectors for 50 Ω coaxial cable is the venerable PL-259, available from Amphenol RF as the 83-1SP-1050 (Figure 5), as well as the wideband Type N, such as the VNS30-2051. Twisted pairs are used with balanced signals. The impedance can be calculated by the following formula. Calculate the impedanceThe correct way to consider impedance matching in transmission lines is to look at the load end of the interconnect and work backwards to the source. 336 by 360, = 0. This page allows you to calculate the impedance required for a 1/4 wave (electrical) section of line. coaxial cable. . Explore the Coaxial Cable Calculator, a handy tool for calculating various parameters of coaxial cables such as impedance, capacitance, inductance, and cutoff frequency. This calculator is able to calculate the impedance, delay, inductance, and capacitance of a coaxial cable. So now lets short out the other end of the cable and measure. 1: A coaxial cable with characteristic impedance 100 and length 75m is attached to a signal generator set to 25MHz. The Smith Chart achieves this by superimposing a grid on S11 that maps load impedance. 5dB loss per 100 feet at 146 MHz). 2 OUTPUTS: Impedance = 51. CRA Calculator. Understanding coax can be helpful when working with it. How to calculate the dimensions or diameter of coaxial feed as per impedance of the equilateral antenna. The Number that follows "WR" is the width of the waveguide opening in mils, divided by 10. Zp= Input/Primary impedance. When the load impedance is mismatched to the source in a 1 : N imped-The calculator now shows that for the length of coax the loss is 0. $endgroup$ –Year. 336 ° (degrees) that is a portion of a 360° angle. However, the twisted. The 3. Good enough, because the calculation for 15 m of typical coax with 6. The calculator will calculate one possible solution for a Single Stub Match that you can implement in your antenna system. Although implementations vary, the wire diameter is usually about 1 mm and and the wire spacing is usually about 6 mm. R2 is the resistance of the protective conductors. This calculator calculates the impedance of a coaxial cable. Schelkunoff in 1934, is a very convenient parameter for the prediction and control of EMI coupling through cable shields. Nu-Track; T-Rad; TCA; QEAM; Connectors. 05+j51. 5). Mil-Spec Cable. Tuesday, October 31, 2023. This calculator calculates the impedance of a coaxial cable. The coaxial cable's diameter conduction allows for. Lower VSWR means lower reflection power (good impedance matching); thus, power transfers to load will be high.