This calculator is designed to calculate the characteristic impedance of an edge-coupled microstrip. The following equation is used to calculate surge impedance: SI L = V 2 LL Z0 S I L = V L L 2 Z 0, where: The CST Cable Studio Impedance Calculator can be started from Cables > Impedance Calculator. microstrip width and impedance. The tool implements numerical solutions of Maxwell’s equations to render accurate and consistent results. Reference: R. 0. matches the transmitter (or transmission line, if it’s placed at the antenna) and the output impedance matches the load. Enter the number n n of impedances in parallel as a whole number and press "Enter". Go to the calculator section. ECE145A/ECE218A Impedance Matching Notes set #5 Page 13 Basis for distributed matching using transmission line segments: the equivalent circuit model of a short transmission line. Models have been created to approximate the characteristics of the wire microstrip transmission line. The input impedance is the ratio of input voltage to the input current and is given by equation 3. 05); Calculate the S-parameters of the equation-based transmission line over the frequency range 1 – 4 GHz. Twisted pairs are used with balanced signals. Return Loss and Mismatch Loss Calculator. Such a microstrip is constructed with two traces referenced to the same reference plane with a dielectric material between them. In other words, if the load impedance is equal to the transmission line characteristic impedance, the input impedance will be likewise be equal to Z 0 regardless of the transmission line length A. Source: Leon Salden, VK3VGA. Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. Z_Load. Visit to learn more about our other electrical engineering tools. In terms of the characteristic impedance in line 1, mutual impedance. This calculator is designed to calculate the characteristic impedance of a symmetric stripline - a flat conductor between two ground planes whose distance between the conductor and the planes is the same for both reference planes. Access technical papers, white papers, calculators, tools and more for circuit laminates, prepreg and bonding materials. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a ground plane. Once the dialog is open a segment to use for the impedance calculation can be defined by either: Selecting it in the dialog opened by "Segment List". This tool can calculate. 671; thus Z 0 = 48. This tool calculates the matching network necessary to terminate a line of the specified characteristic impedence (Z o) in a specific complex load impedence (R L + jX L) at a specified frequency. The impedance calculator can also update the PCBS stackup with the current setup. Equation 3, which was developed by Martin Marietta in the mid 1980s, is a method for predicting the impedance of buried microstrip transmission lines. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. 7. It is frequently used as such in antenna work when it is desired, for example, to transform the impedance of an antenna to a new value that will match a given transmission line. Enter the Outer Diameter (D), Outer Diameter (d), and Permittivity. The calculator shown below uses Wadell’s equations for differential impedance, which can be found in the seminal textbook Transmission Line Design Handbook. In this section, zo is calculated for four common transmission lines — coaxial, twin-lead, parallel plate, and microstrip. A two part calculator which gives ideal and preferred value resistors, showing most formulas used and a link to the others. freq = linspace (1e9,4e9,51); sparam = sparameters. Thus, the TDR method is use-ful for measuring Z 0 and changes in Z 0 of a transmission line. 0. A BASE = Base Amps. They are "per foot" if the inner conductor units are inches or mils. The effective dielectric constant drives the length of the taper, this effect was not. Initial planning studies typically only consider balanced, steady-PCB stackup, signal integrity and controlled impedance: Signal integrity tools: Stackup design. Since the argument of the complex exponential factors is 2βl, the frequency. I. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a. For 25 ohms, we calculate 31 mils line width and 7. When in doubt, use 1 for copper, . Differential pair into PCB calculator. Track Thickness: mm. The allegro calculator gives a value of 56. b. It is composed of two conductors: a signal trace and a return path which is usually a ground plane. • Each port in a structure being analyzed can be viewed as a cross-section of a transmission line. %&˜’()& $*+%&˜’(,%+-. A balanced Y-connected load of (300 + j100) Ω is supplied by a three-phase line 40 km long with an impedance of (0. A twisted-pair cable is simply two wires that are twisted together so as to reduce radiated EMI (electromagnetic interference) and mitigate the effects of received EMI. This can be achieved by regulating the inner and outer diameter of the coaxial cable, along with the. 6. This has led to the development of a special radio-frequency transmission-line calculator for solving many ordinary transmission-line problems. 0 . Calculate impedance from resistance and reactance in parallel. At any frequency, the axial propagation factor β and the characteristic impedance Z c of an equivalent transmission line can be determined. One thing is for sure: When you are routing a high-speed PCB design you are going to be working with impedance-controlled routing and. At a distance x into the line, there is current phasor I(x) traveling through each wire, and there is a voltage difference phasor V(x) between the wires (bottom voltage minus top voltage). This is to accommodate users who found the original ranges too limiting. In Figure 3. Each grid of the insulator can be thought of as 4 capacitors each. It’s particularly useful for determining the characteristic impedance (Z0), resistance per unit length (R), angular frequency (ω), inductance per unit length (L), conductance per unit length (G), and capacitance per unit length (C). Calculate the Transmission Line impedance Z0 for a large variety of mechanical structures. Include both the pcb dielectric thickness as well as the wire insulation in the height calculation. 1: 300-to- 50 Ω match using an quarter-wave section of line. 1: Relationship of order N, fractional bandwidth, impedance ratio δz = max(ZL / ZS, ZS / ZL), and reflection coefficient ripple Γm for a Chebyshev stepped-impedance transformer. These values are computed as distributed (per. 4. 78, and operating at a frequency of 7. This allows the stored energy, capacitance, inductance and impedance to be found. The Er (relative permittivity) is set as a common factor for all the possible mechanical designs and calculations. 1: 300 Ω 300 Ω twin-lead. 3. Port Characteristic Impedance, Zo (Ohms) =. Impedance Calculator Talk to a Sierra Circuits PCB Expert today. 1: Impedance-matching using a quarter-wavelength transmission line. In terms of the characteristic impedance. Webb ESE 470 16 Short-Line Model How we choose to model the electrical characteristics of a transmission line depends on the length of the line Short-line model: < ~80𝑘𝑘𝑚𝑚 Lumped model Account only for series impedance Neglect shunt capacitance 𝐼𝐼and 𝜔𝜔𝜔𝜔are resistance and reactance per unit length, respectivelyLadder line spreader built from black irrigation extension tube and a cable tie. Microstrip Transmission Line Models. All the math involved is well explained and documented by Dan AC6LA on his site. Coplanar waveguide transmission line calculators (CPW, GCPW) I’ve just emerged from a rabbit hole & thought I’d share what I learned regarding available impedance calculators for coplanar waveguide (CPW) and coplanar waveguide w/GND (GCPW). The results show the input impedance input of the system, reflection coefficient between transmission line and load, VSWR of system. H 2 H 2 = subtrate height 2. Free Windows program for calculating the loss and impedance transformation. This is actually a general way to express impedance, but it requires an understanding of complex numbers. Per-unit-length parameters are "per meter" if the inner conductor units are cm or mm. e. 4. com Microstrip Impedance Calculator. EEWeb offers a free online twisted pair impedance (transmission line) calculator. 5 is a lossy transmission line and the total voltage and current at any point on the line are given by. Multiple dielectric transmission line calculator using a 2D field solver to compute the transmission line characteristics from the circuit trace dimensions entered by the user. The alternating current that runs on a transmission. To achieve matched impedance, multi-section transformers are connected between the feeder transmission line of characteristic impedance Z 0 and the load impedance Z L. The Surge Impedance Loading calculator computes the power loading of a transmission line based on the line to line voltage and the surge impedance. Reflection coefficient is also. Thus, since the transmission line has a length of L, the input impedance is Z(-L). It will also depend on current ‘I2’ in line 2 through coupling or mutual impedance ‘Zm’ between lines 1 and 2. This Mantaro calculator tells me that I need a trace width of 11. The characteristic impedance (Z 0) of a transmission line is the resistance it would exhibit if it were infinite in length. A BASE = Base Amps. Figure 2. The user will select the circuit materials and the circuit construction, after which the software will determine the predicted impedance and other electrical information. TransLine. This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. The Smith chart was an invention of the electrical engineer Phillip Hagar. Between a transmission line and a via structure with different impedance; Between a transmission line and some other RF structure with different impedance; Between a transmission line and a load component with different impedance; While there is not enough room to cover every taper design situation listed above, I’ll do my best to. The microstrip calculator determines the width. The microstrip calculator determines the width and length of a microstrip line for a. Neglecting these dynamics can undermine product development by compromising performance, power consumption, EMC/EMI compliance, and more - leading to delayed design cycles and opening gaps that can be exploited by your. Figure 5. 4. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. Overview. One other open source calculator is atlc. The Coaxial Line Impedance (Z0) Calculator is a valuable tool for engineers working with RF and telecommunications systems. This calculator is a tool for designing balanced transmission lines with a specific desired characteristic impedance Zc and made of parallel square stock. Z0 = V~+ 0 I~+ 0 = R + jωL γ Z0 = −V~− 0 I~− 0 = R + jωL γ (8) (9) (8) Z 0. The impedance calculator in Altium Designer integrates with your PCB layer stack design tool and can calculate impedance for many transmission line geometries, including coplanar waveguides. T T = trace thickness. s. 2 3. Use the Series and Shunt Impedance Calculator: to try your own impedances; Change Grid: S11, (ZL normalized to source impedance Z0). Great tool. 33 mA; end: V=0, I=13. 54 + 0. e. Visitors to the DesignCon® 2011 exhibition (Santa Clara Convention Center, Santa Clara, CA, February. 7. The Transmission Line Reflection Calculator has 2 sections: Input and Output. 0-1)˚,ˇ%233+. G = 2πσ ln(b / a) Figure 2. There are four factors that generally enter the solution of problems involving the changing input impedance along a line. In electrical engineering, a transmission line is a specialized cable or other structure designed to. Solution. 5. The IPC Formulas and Wadell’s Method. Here's a spreadsheet that calculates characteristic impedance of a transmission line based on measure reflection coefficient. Under common mode driving (same magnitude, same polarity), the even mode impedance is the impedance of one transmission line in the pair. This represents the length of the transmission line, where is the wavelength in the transmission line. Open Wire Feeder Impedance Calculator. For more information see About. In this ideal scenario, no power is lost, and the VSWR value is 1 : 1, which signifies 100% transmission of the input power from the source. In general, a line impedance of a lossy transmission line is a frequency dependent. Transmission Line Details by Dan AC6LA. If the impedance of the TDR unit is known via proper calibration, then the Z 0 of the transmission line attached to the TDR unit may be determined. Nist, KQ6QV has free software for calculating arbitrary transmission line impedance, as well. If is the characteristic impedance of the line, then () / = for a wave moving rightward, or () / = for a wave moving leftward. Dielectric Thickness: mm. EMC Products and Services; EMC Organizations; EMC Periodicals. With hundreds of coaxial RF cables in-stock and ready to ship worldwide immediately, our coax capacitance calculator lets you calculate the impedance of a coax by allowing you to enter the outer diameter dielectric width and inner conductor diameter. Figure 25. An online transmission line calculator is a web-based tool that allows users to calculate various parameters associated with transmission lines. The Transmission Line Calculator is a handy tool for computing various properties of a transmission line. These values are computed as distributed (per. 5 rad. 36&˚%ˇ%272+˜-˙˜. Use the Online Microwave Impedance Calculator now. Single-stub matching is a very common method for impedance matching using microstrip lines at frequences in the UHF band (300-3000 MHz) and above. Press Analyze to see the results. Figure 2 is the diagram of a transposed transmission line showing the self-impedance Z. The radius of the circle is the reflection coefficient G , where the radius to the edge is 1. Each grid of the insulator can be thought of as 4 capacitors each. This free online interactive Smith chart tool is a calculator which can help you design matching networks and obtain maximum power transfer between your source and load. This calculator is a tool for designing balanced transmission lines with a specific desired characteristic impedance 𝑍c Z c and made of parallel square stock conductors of a given side length 𝑑 d. = 2π/15 x 10 3. The nice part about coax is that it can be bent and flexible unlike most pcb transmission lines. 337) Various coupled transmission line geometries. It is widely accepted that the most accurate impedance calculations are produced with a 3D field solver due to the complex geometry in any PCB. The microstrip impedance calculator shown above uses Wadell’s equations for microstrip impedance, which can be found in the seminal textbook Transmission Line Design Handbook. Also, what. This calculator helps translating the color bars from the resistor to its value. The impedance Z 0 of a transmission line consisting of a circular signal conductor having a diameter d and centered between parallel ground planes separated by a distance h is given by: Eq. If the ground plane is treated as a universal ground, then the model of a segment of length Δz is as shown in Figure 2. For better impedance control, use PCB design software you can trust. e. When bad calculations arise, traces that support high-speed edge rate signals eventually play the role of transmission lines, even though they are short. In addition to the characteristic impedance of a transmission line, the tool also calculates: Transmission-Line Calculator. A commonly-encountered form of parallel wire transmission line is 300 Ω 300 Ω twin-lead. This paper documents the development and testing of a Transmission Line Parameter Calculator (TLPC), which computes the impedance parameters for short and medium transmission lines. 0 MHz. Frequency. Change Grid: S11, (ZL normalized to source impedance Z0) Z_Load. With hundreds of coaxial RF cables in-stock and ready to ship worldwide immediately, our coax capacitance calculator lets you calculate the impedance of a coax by allowing you. Transmission Line Calculator March 6, 2007. The right-hand side of Equation (5. Radius. Characteristic impedance (Z 0) calculator - step by step calculation, formula & solved example problem to find the characteristic impedance of the lossless transmission line. Use the "Spin Buttons" to adjust the values in the box. A lossless transmission line has characteristic impedance = 300 Ω, is 6 3 wavelengths long, and is terminated in a load impedance 25 Ω. The objective of this paper is to present techniques to estimate the zero-sequence line impedance of all sections of a three-terminal line and the Thevenin equivalent impedance of the transmission. It has specific width and thickness. 6 mils line width, and the effective dielectric constant is 6. The impedance values can be stated in either phase coordinates (A, B, and C) or sequence coordinates (zero, positive, and negative sequence). This calculator is designed to calculate the characteristic impedance of a broadside couple stripline (see diagram below). The Excel based tool (see link below) calculates the capacitance and inductance per unit length as well as the impedance of a transmission line. 2) Open-Circuited Line, L = ∞ (1. 151. This data is entered on the left side. The impedance calculator in the Layer Stack Manager supports single and differential coplanar structures. Calculation parameters: The conducting wire of circuit and material the inductor is made from, are both uniform and they have the same thickness everywhere; the source supplies AC current. Without repeating everything in that article, the input impedance depends on the characteristic impedance, propagation constant, load impedance, and length of the. Satellite Look Angle Calculator. In other words, if the load impedance is equal to the transmission line characteristic impedance, the input impedance will be likewise be equal to Z 0 regardless of the transmission line length A. 5rad. 7. A transmission line drawn as two black wires. Of course, this only occurs at resonant points resulting in a standing wave of 1/4 cycle (the line's fundamental, resonant frequency) or some odd multiple (3/4, 5/4, 7/4, 9/4 . For example: Yellow Violet Red Gold: 4 7 x100 ±5% = 4700 Ohm, 5% tolerance. Home; Services. 23. Note: The results are only for approximation and rough. This online microstrip impedance calculator calculates the characteristic impedance of the microstrip (Ω), W/H ratio, and effective dielectric constant (εe) by entering the value of dielectric material relative permittivity (εr), the width of the copper trace (W), and dielectric height (H). 3 3. 15. Antenna Modelling with Numerical Electromagnetic Code. Equation 3. Adding shunt inductance moves clockwise along constant admittance circles. Transmission Line Reflection Calculator. Users need only specify the material. 7-f9a2dced07~116. This transmission line calculator calculates the impedance at input and attenuation of a given transmission line once terminated with the given load. Coax Calculator. Transcalc is built using the GIMP toolkit (GTK+) for its GUI interface. 8/ (Er^0. The Transmission Line Calculator is a handy tool for computing various properties of a transmission line. Overview. The substrate parameters (ε r and h) and the frequency of interest are required. IEEE EMC+SIPI Symposium, Grand Rapids, MI, July 31 - Aug 4, 2022; More EMC Information Sources. The K values for the various transmission lines are also copied from his Transmission Line Details windows. INPUT DATA. In general, θ = ( π / 2) ( f / f 0). Z0 = (60 / √εr) * ln ( (8h) / (w + s)) Where εr is the dielectric constant of the substrate material, h is the substrate height, w is the trace width, and s is the spacing between traces. Dimensional units: mm inch. The relative permittivity of the medium ϵr ≈ 1 ϵ r ≈ 1 for the. e. Use this option with the input arguments in the previous syntax. Understanding coax can be helpful when working with it. The spacing between the wires is 5mm and the measured impedance is ~200 ohms. The formula for S11 treats the transmission line as a circuit network with its own input impedance, which is required when considering wave propagation into an electrically. For example, if u = 1 and ε r = 10, then from the figure, Z 0 ε e = 126 Ω and ε e / ε r = 0. To use this tool, enter the values for. In this ideal scenario, no power is lost, and the VSWR value is 1 : 1, which signifies 100% transmission of the input power from the source. Nist, KQ6QV has free software for calculating arbitrary transmission line impedance, as well. Inductor Q Factor. The result also depends on the length and phase propagation constant of the line. This data is entered on the left side. UCCALC. Capacitor, Reactor, Transformer, Cable, etc. In twin-lead or any parallel-conductor transmission line, the insulation is designed to keep that distance stable. Unit length of inductance L & unit length of capacitance C are the key elements of this calculation. L to the beginning of the transmission line, so that we can replace the transmission line with its input impedance Z in : Note by voltage division we can determine: ()in g g in Z V zV ZZ =− = + A And from Ohm’s Law we conclude: ()g g in V Iz ZZ =− = + A And thus, the power P in delivered to Z in (and thus the power P abs delivered to the. Moreover, this tool can. Press Analyze to see the results. The relative permittivity of the medium ϵr ≈ 1 ϵ r ≈ 1 for the. In this equation there is no dimension to the surface of the PCB. Several equations are presented here, and these equations describe ideal situations that do not account for the complex geometry of a real PCB. LPARA, an existing software at The Trinidad and Tobago Electricity Commission (T&TEC), has been. FH11 Author: dori. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. g. Gt is the gain of the transmitting antenna. This calculator finds both odd and even transmission line impedance. Online calculators will generally use Wadell's equations to determine the transmission line impedance numerically. Combine this with increased clock frequencies and data rates and the result is a critical challenge to high-speed design. The amplitude increases as the coupling length increases up to a point. This calculator provides accurate microstrip transmission line analysis and synthesis. LPARA, an existing software at The Trinidad and Tobago Electricity Commission (T&TEC), has been. A tool for calculating the impedance of a coaxial cable given its dimensions. Following is the list of useful converters and calculators. Input Impedance of a Transmission Line with a Load Impedance Recall from the previous chapter that we chose z=0 to be at the load, and everything to the left of that point has a negative value of z. In other words, the line impedance at the end of the transmission line (i. This calculator finds both odd and even transmission line impedance. 16. One commonly used formula for calculating the characteristic impedance of a PCB trace or transmission line is the capacitance per unit length formula: Z0 = 1 / (C / L) where Z0 is. How much power does the generator deliver? Answer: The diagram for this problem is given in the following diagram:Coaxial Cable Impedance Calculator. One misconception concerns cable impedance and cable loss. In this Type C PFN, each capacitance has an initial condition voltage of 1000 V. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. Microstrip Transmission Line Models. Dielectric loss in a PCB transmission line. Where: L represents the total path loss in decibels (dB). 1. Include both the pcb dielectric thickness as well as the wire insulation in the height calculation. Enter the εr of the PCB: Enter the width of the track: mm. 1 7. All the math involved is well explained and documented by Dan AC6LA on his site. Vias (plated holes) are used to route electrical signals among different layers of a multilayer. A λ /4 line is, in effect, a transformer, and in fact is often referred to as a quarter-wave transformer. dBm to Watt converter Stripline Impedance calculator Microstrip line impedance Antenna G/T Noise temp. The characteristic impedance (Z o) of coplanar waveguide with ground or microstrip lines with signal side ground plane can be calculated using the active calculator or the equations at the bottom of the page. When you want to determine the width and length of a microstrip line for any given characteristic impedance and electrical length, or vice versa, a microstrip calculator is the right tool to do so. 45 for gold. TX-LINE software is a FREE and interactive transmission-line utility for the analysis and synthesis of transmission-line structures that can be used directly in Cadence ® AWR ® Microwave Office ® software for matching-circuits, couplers, and other high-frequency designs. While Z 1L is directly input into the relay as a setting, Z 0L is. The video. So, the dielectric at my 5-6GHz frequency range is 3. • HFSS will always calculate Zpi. This parameter is used for the loss calculations. It also gives an estimate of the mismatched loss if the mismatch is specified. This is entirely different from leakage resistance of the dielectric separating the two conductors, and the metallic resistance of the wires themselves. 1 where k is the solution of: Eq. A Clemson ECE635 Project by Adam Schreiber and Jason Byers. Structure of micro microstrip transmission line. Characteristic Impedance Ω. 1 (a). Z. The software also has some capabilities for predicting transmission line losses as well. This parameter is used for the loss calculations. rlgc_params = s2rlgc(___,z0) transforms multi-port S-parameter data into a frequency-domain representation of an RLGC transmission line using a characteristic impedance of z0. 98mil. Free Windows program for calculating the loss and impedance transformation. Articles; Tools; Contact Us; Main Menu. The two conductors are separated by a dielectric material. Sierra Circuits’ Transmission Line Reflection Calculator. of Kansas Dept. Rho: Conductor resistivity relative to copper. Enter the thickness of the track: mm. Topic 56: Characteristic Impedance One of the most basic parameters of a transmission line is zo, its characteristic impedance. Online VHF UHF. Example 7. 2 of the Microstrip Calculator, h=H1 and b=H2-H1. 2. The Pi match circuit is so named because the circuit topology can resemble a pi symbol. Enter values for W and L for a microstrip line to determine its Zo and Electrical Length. Find the transmission or propagation parameter of the transmission line or wave guide whose wavelenggh λ = 15 x 10 3. TX-LINE software is a free and easy-to-use Windows-based interactive transmission line calculator for the analysis and synthesis of transmission line structures. 16. Select the Z0 button to calculate the characteristic impedance of the corresponding line. The required values are trace thickness, substrate heights, trace width, and subtrate dielectric in the calculator above and press the "calculate" button. Thus, for this system, VSWR = 1:1 (i. It’s particularly useful for determining the characteristic impedance. A stripline impedance calculator can help you determine the width that will be needed to hit a target impedance for a given substrate dielectric and thickness. Z. Zo (unloaded trace impedance, Ohms) = Tpd (unloaded propagation delay, ps/unit len) = Cl (distributed capacitve load, pf) =. RF/Microwave Design; Digital Design; Layout Services. , z 1P, z 2P, z 3P, z 4P). 2, and Section 2. . HF Antenna Trimming Chart. Coaxial Cable Impedance Calculator. Incorrect line impedance values in transmission line models can lead to inadequate relay settings that can potentially lead to distance element misoperations. a. Line Length: This is the value of the distance of the transmission line. The impedance values can be stated in either phase coordinates (A, B, and C) or sequence coordinates (zero, positive, and negative sequence). Then enter the values of the impedances as complex numbers of the form a + bj a + b j, where the. This transmission line impedance value is important in impedance matching and can be used to quantify when a transmission line has surpassed the critical length; take a look at the linked article to see how you can quantify permissible impedance mismatch. The impedance of a PCB trace can be calculated using the formula for the characteristic impedance of a transmission line: Why are PCB tracks 50 ohm? A 50-ohm transmission line is commonly used in high-frequency applications due to its balanced properties of signal integrity, power handling, and manufacturability. This calculator helps you calculate the characteristic impedance of a coaxial cable given its dimensions. RF/Microwave Design; Digital Design; Layout Services. The dimensions of some of the. 3) Matched Line, L = Z C (1. Though it's important to note that these properties are distributed throughout the entire length of the transmission line, lumping them all together we can model a transmission line as: The characteristic impedance is then: $$. All we need to do is calculate the proper transmission line impedance (Z 0 ), and length so that exactly 1/4 of a wave will “stand” on the line at a frequency of 50 MHz. First, calculating the line impedance: taking the 75 Ω we desire the source to “see” at the source-end of the transmission line, and multiplying by the 300 Ω load resistance, we. A PCB transmission line is a type of interconnection used for moving signals from the transmitters to the receivers on a circuit board. Impedance Analysis Calculator. Calculating Characteristic Impedance. View All Tools. Characteristic impedance.