Picking from the CST Cable Studio Segments Navigation Tree. For example, with microstrip, you can specify the substrate parameters (primarily thickness and dielectric constant) and use Linecalc to calculate the impedance for a given line width; this is the “analysis” mode. VSWR, Return Loss and Reflection Coefficient. Don’t forget to check out our other. The impedance of a differential via pair cannot be treated with a single via impedance calculator unless the vias are spaced far apart. T-Match Topology. Schematic representation of a PCB patch antenna: The calculator is based on simplified formulas for calculating microstrip transmission lines and is intended for preliminary calculation only. Following is the formula for differential impedance for a Microstrip. com Microstrip Impedance Calculator. Units do not matter as long as they are consistent. If there is an insulator around the wire then this calculator will be an estimate. What is Microstrip Impedance? See full list on allaboutcircuits. Imagine that I need to have a 50 ohms impedance in a PCB trace. subtracted from each measurement. A major advantage of a radial stub is that the input impedance presented to the through line generally has broader bandwidth than that obtained with the. example. The IPC Formulas and Wadell’s Method. 3. Both formulas of the dielectric, as well as the total losses, agree. could someone point me towards reliable and proven method to calculate impedances for edge coupled differential microstrip?From here, we can see that there are specific stack-ups where a CPW and a microstrip/stripline will have 50 Ohm impedance and the same trace width, even though the ground clearance is quite close clearance to the trace in the CPW. Result: Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. The thickness and width of the printed wire, the distance between the printed wire and the ground, and the dielectric constant of the dielectric determine the characteristic. Printed Circuit Board (PCB) RF Microstrip Calculator with Formulas. Coax Impedance (Transmission Line) Calculator. 5, determine. JLCPCB Impedance Calculator. The calculator is set up to handle an asymmetric arrangement, where traces are not centrally located in the PCB layer stack. The Sierra Circuits Impedance Calculator uses the 2D numerical solution of Maxwell’s equations for PCB transmission lines. The following formula is used to calculate the differential impedance of a microstrip: To calculate the differential impedance of a microstrip, divide the characteristic impedance of the microstrip by 2. Using typical values of W = 8 mil, H = 5 mil. h – rectangle short side. There are a lot of online trace impedance calculators specifically designed for differential traces. THESE FORMULAS ARE APPROXIMATIONS! They should not be used when a high degree of accuracy is required. STRIPLINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS. *Solder resist PCB coating will have the effect of lowering the impedance (due to the 30um or so of Er 3. To use this tool, enter the values for. Following is the list of useful converters and calculators. Agilent's LineCalc tool calculates Z odd = 50. So two estimates have been calculated for the frequency at which the first higher-order. Introducing the newest version of the Microwave Impedance Calculator from Rogers’ Advanced Connectivity Solutions. 1 Microstrip Line in the Quasi-TEM Approximation; 4. 1. Microstrip Line Calculator Analyze or synthesize a microstrip line based on substrate parameters and frequency. Overview. 0. 98 * 1 / 2) / sqrt(4. Index Terms-Microstrip patch antenna, MATLAB calculator, CST, 2. More. coplaner waveguide spacing. November 15, 2023 Maurizio Di Paolo Emilio. might have been the test equipment calibration, impedance mismatch amongst the measurement system’s cables and adapters, or trace impedance errors resulting from structural defects in the etched microstrip lines. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. Section-2 describes the introduction to microstrip antenna and different impedance matching techniques. It also determines the wavelength and the length adjustment. Use an online differential microstrip impedance calculator; Use an online differential stripline impedance calculatorThe lateral dimensions, however, are well controlled being photolithographically defined and then etched. 2. In addition to the characteristic impedance of a transmission line, the tool also calculates. To help you run through the above integral, you can download a microstrip trace taper calculator worksheet for use in Excel. 7. The characteristic impedance of your microstrips is determined by the trace width for a given layer stackup. This page of converters and calculators section covers microstrip line impedance calculator. You may also check it on amazon. With Altium Designer, you won’t have to rely on an external calculator to size a printed antenna or design an impedance matching network. The amplitude increases as the coupling length increases up to a point. Microstrip Trace Impedance Calculator; Stripline Trace. Differential microstrip impedance calculator is an online electronic tool to measure the opposition to alternating current. The required inputs are the Dk value for the dielectric constant of the PCB substrate, and the. 5 resin). Coplanar wave guide. Differential Impedance Calculator. INPUT DATA. The websites associated with hits 2-5 all calculate the microstrip impedance for this stackup to be 50. Large selection of online interactive calculators for RF design, including attenuators, capacitance, resonance, RF traps, and microstrip impedance. A solution to the problems of microstrip is coplanar waveguide (CPW) shown in Figure [Math Processing Error] 3. The Calculator assumes that 1. To use this calculator, enter the values for the wire diameter and substrate dielectric and press the "calculate" button. Email: info@multi-circuit-boards. The inductance of a PCB trace determines the strength of any crosstalk it will receive. To use this calculator, enter the values for the wire diameter and substrate. The original source of formula is IPC-2141: Controlled Impedance Circuit Boards and High-Speed Logic Design, April 1996. Equation 11. 8. *The structure may propagate in 3 modes: coplanar waveguide, coupled slot lines and microstrip. 17mm FR408 - 17um. Note that the "h", for dielectric thickness in this formula is omitted in some other Polar publications. Yet I got a ZDiff CPW with ground capable calculator: Differential surface coplanar waveguide with ground calculations: *0. It is a ribbon wire (signal line), separated from the ground plane by a dielectric. A microstrip is created by etching a trace on a printed circuit board and is mostly used in microwave applications. Just as a sanity check, we can quickly calculate the total inductance of a trace determined with this method and compare it with typical values. 4. For simple cases it's just applying the formula found all over the internet or use one of the online calculators. Coil Inductance Calculator. Z 0 now meets your requirements. THESE FORMULAS ARE APPROXIMATIONS! They should not be used when a high degree of accuracy is required. • Viewing of results for S-parameters, characteristics impedance (𝑍0), and Total loss for the entire frequency spectrum. Microstrip trace geometry, Waddell’s equations for microstrip impedance, and effective dielectric constant of microstrip traces. With our handy calculator, you can choose from 50 Ohm, 75 Ohm, 93 Ohm and 95 Ohm coaxial cables. At low frequencies near 0 GHz, the input impedance is inductive since. Microstrip impedance shall be calculated according to above Eq. This calculator is designed to calculate the characteristic impedance of an embedded microstrip - a flat conductor suspended over a ground plane with a dielectric between it and another dielectric material above the. Microstrip Width Formula or Equation. 39 for the effective dielectric constant. 2 (t / h) 2 for W/h > 1. 04 in the ε eff. Introduction The edge couple differential microstrip transmission line is a common technique for routing differential traces. 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. Electromagnetic Compatibility Calculators include: PCB Trace. They consist of a conductor fabricated on the dielectric substrate of permittivity ‘𝜀r’ with a grounded plane. Each Port is matched to the characteristic impedance Z 0 of the single, isolated microstrip transmission line. Note that if the trace is longer than its critical length, it should be treated as a transmission line with a controlled impedance. 035mm and Er = 4. Choose your desired transmission line structure (single ended or differential covered microstrip, inner layer stripline, offset stripline); use. Coplanar wave guide. Microstrip Length (L) in inches. Dielectric Thickness: mm. If the ratio (L/W) is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. 1. Most RF systems are built around 50 Ω impedance. Where: Z 0 is the characteristic impedance of the microstrip; ε r is the relative permittivity (dielectric constant) of the substrate material; h is the height of the microstrip above the ground plane; W is the width of the microstrip trace; By knowing the values of the dielectric constant, height, and width, you can use this formula to calculate the characteristic. The amplitude of this crosstalk is what this tool calculates. In Figure 3. For better impedance control, use PCB design software you can trust. 5 resin). Edge Coupled Microstrip Impedance Calculator This tool helps calculate the impedance of an edge-coupled microstrip. D = trace edge to edge spacing. 3 predicts Zo to be about 46 Ω, generally consistent withHere lies the challenge: impedance calculators must balance speed and accuracy. dBm to Watt converter. Relative Dielectric Constant ( εr ): Track Width. Example (PageIndex{1}): Microstrip Design. LC Impedance matching network designer Enter the input and output impedances to be matched and the centre frequency. This tool helps you create a matching circuit so that optimal power transfer occurs between unmatched loads. 8 , Guide wavelength= 0. ( 0. 3%, are. Stripline Calculator. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a calculated impedance according to the IPC-2141 standard. If there is an insulator around the wire then this calculator will be an estimate. t is the Thickness of track (1 oz/ft2 = 0. The edge couple differential microstrip transmission line is a common technique for routing differential traces. Click the button corresponding to the unknown parameter to calculate its value ( 0. Two known methods of controlling the input impedance of a microstrip end-fed patch antenna are investigated and their results are compared. Characteristic Impedance [ohms] Coupling Coefficient [-] Even Mode Impedance [ohms] Odd Mode Impedance [ohms] Electrical Length [degrees]A cross-hatch plane is shown in the image below. 293, 50% of the copper removal can be achieved. We are now ready to calculate the microstrip characteristics. *PCB vendors can use controlled impedances and will vary any designated trace width at mask level to hit impedance targets. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. The differential signals have a differential characteristic impedance. This study aims to optimize rectangular Microstrip Patch Antennas (MPAs) in terms of bandwidth, return loss, input impedance, voltage standing wave ratio (VSWR), impedance matching, and resonant frequency by means of a radiating element that is sliced into eight circular slots. H (Dielectric thickness) : Embedded microstrips are commonly crafted using printed circuit boards, although other materials can be used. Microstrip Patch Antenna Calculator Formula. INPUT DATA. The impedance calculator determines the signal properties and clearances (first image), use that clearance. Note: The results are only for approximation and rough estimation, the final values and the. Microstrip Impedance Calculator Enter the Height, Width and Permittivity to get the Impedance of the Microstrip Note : The unit of the height and width entered must be the same. Such waveguides are an alternative to the microstrip line, when the signal and ground conductors are in the same plane (hence the name). The next graph investigates this further. Transcalc. The accuracy of the equations was observed to be slightly better for higher permittivities. In this measurement, a voltage source is used to excite Port 1 and the received signal at. Pasternack's Microstrip Calculator computes a microstrip's height/width ratio, impedance and relative dielectric constant for a microstrip transmission line. 6046 [ohm] Zodd = 47. Quarter Wave Transformer Impedance Calculator. Microstrip Transmission Line Calculator Using IPC-2141 Equation. Re: Z0 with ADS dear all thanks for your support, i am uploading little image of a microstrip line which is according to line calc has 25ohm impedance, the termination are of 50ohm, now as i said earlier i am getting 0. 0 2. 96s/h )If you wanna confirm how good is the tool any of the two ways can be followed: 1. October 18, 2023 Maurizio Di Paolo Emilio. 32 and the equation shown in 5. Differential Impedance Ω. The calculator produces more accurate results than the IPC formulas for impedance because it implements a more. The patch cutout for the feed inset should be > 2 times the microstrip width. High-end calculators can rely on top-of-the-line systems to cover any computing speed deficiencies, but general impedance calculators must make a clear design tradeoff. This calculator computes the trace width of a stripline if the maximum current, trace thickness, temperature rise, ambient temperature and length are given. The edge couple differential symmetric stripline transmission line is a common technique for routing differential traces. Resistance in mOhm/inch. A differential stripline pair refers to two traces located between two reference plane layers, which are routed as a differential pair. These equations are. The microstrip line is a printed wire separated by a dielectric on the ground layer. Where: Z 0 is the characteristic impedance of the microstrip; ε r is the relative permittivity (dielectric constant) of the substrate material; h is the height of the microstrip above the. WILKINSON POWER DIVIDER CALCULATOR. The calculator below uses Wadell’s. 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. It is a useful tool in the design and analysis of microwave circuits, particularly in the fields of communication, radar, and satellite systems. The inductance of a rectangle loop has three geometric variables: W – rectangle long side. 5mm, T=0. Rectangle Loop Inductance Calculator. If you leave the relative permittivity Er blank, a default microstrip dimension will be used, and. There are four different types of impedance used. 2301 [ohm] Z0 = 68. Based on the assessment in the Polar Instruments article, Wheeler’s method appears to be the most accurate method for calculating microstrip. Z diff = 2* Z o (1 - 0. These are considered to be standardized impedance values with cables readily available. Example 3. ( 0. c) The wavelength of the line at 10 GHz. 0, medical, smart city, and other applications that are impractical or impossible with other wired and wireless technologies, providing twice the bandwidth and three times the speed of Wi-Fi 6, deterministic network support, and more…. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. Calculator Type. If you're trying to get your own pcb design project , you should use this tool. Typical realisation technologies are printed circuit board (PCB), alumina coated with a. A. Skin Depth Calculator returns skin-depth as a function of a material's resistivity and permeability, as well as the application frequency. Pasternack's RF calculators and conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Values for L and C will be calculated for the four. dBm to Watt converter Stripline Impedance calculator Microstrip line impedance Antenna G/T Noise temp. If you need to find and use an efficient and accurate microstrip impedance calculator that provides lossless impedance values, you can use our free tool below. We use our online calculator to effortlessly compute the impedance, capacitance, propagation delay, and inductance of a microstrip line on a PCB. Visit to learn about our other electrical engineering tools & resources. Visit to learn more about our other electrical engineering tools and resources. For an embedded (internal) microstrip, the formulas provided in paragraph 4. • Plotting 𝐸⃗ fields for magnitude and vector, in both linear and dB scale. Note: All dimensions are in mils. Use this user-friendly online calculator to calculate the impedance, capacitance, propagation delay, and inductance of a Microstrip Line on a Printed Circuit Board (PCB). Figure 2. 3: Normalized characteristic impedance and normalized effective permittivity of a microstrip line as a function of u = w / h. HFSS Waveport Size Calculator Figure out the correct waveport size to use in HFSS for a microstrip line feed. This microstrip impedance. Compared to waveguides, microstrip is generally has a lower power handling capacity, and higher losses due to the fact that it is not enclosed. One of the features of this type of microstrip is the coupling between lines. This will also provide the time delay the cable provides for a signal and also the capacitance and inductance per. This transmission line calculator. A better estimate of the frequency where the higher-order microstrip mode becomes a problem is given by Equation (4. RF Calculators. The substrate parameters (ε r and h) and the. Asymmetric Stripline. For example, a 2 inch microstrip line over an Er = 4. This is the same calculator integrated in other open-source tools like the microwave circuit simulator Qucs, or the circuit board design tool KiCad. 6 ohms. 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. To use this calculator, simply input your microstrip geometry and Dk value, and the tool will return the differential impedance value for a pair of microstrip traces. g. Input w, and click on [ Analyze ] button. For a more accurate analysis, use ANSYS HFSS or similar programs. Most importantly, it computes the critical length of the trace. 6 Band Resistor. Microstrips (Source: Max Maxfield) In order to fine-tune the transmission line properties of the microstrip, we need to calculate the impedance of the trace. The frequency of the signal through the microstrip line. 08. Make sure the correct Layer is selected before changing this option. FDTD simulation setup. Dual Stripline Trace. 8. Following is the list of useful converters and calculators. Microstrip Patch Antenna Calculator Calculate dimensions and edge impedance for desired resonant frequency. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. By determining its trace resistance, the contribution of a microstrip to the overall circuit resistance can be evaluated. 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. 6 Ω. The Calculator has the following tools: Regulators. CPW consists of a central strip flanked by two metal half-planes that carry the return current. 32 and 5. New Online Microwave Impedance Calculator. Just as was the case with microstrip impedance calculators, stripline impedance calculators tend to rely on either the IPC-2141 formulas or on Wadell’s equations. Microstrip Impedance. Printed Circuit Board (PCB) RF Microstrip Calculator with Formulas. Broadside Trace Inductance Calculator. For this calculation, the units of d and h can be ignored as long as they have the same unit. Hits: 6158. 4. 37mm for a 50 ohm. The embedded microstrip impedance formula is an approximation and the results are highly sensitive to the values of the variables. The full structure of the transmission line in microstrip_rlc. The symmetric stripline is the simplest embedded trace arrangement next to the embedded microstrip. 5 GHz. The lumped element is modeled using the RLC material available in the Material tab of the. Impedance calculation. L-Match Topology. SAVE & ACCEPT. 946 for silver, or 1. Wire Microstrip Impedance Calculator. In design, the physical dimensions must be determined given the desired electrical properties. The characteristic impedance is an important parameter determining the power handling capacity of a waveguide, both average and peak powers. Useful converters and calculators. The use of a radial stub (Figure (PageIndex{4})(a)), as opposed to the conventional microstrip stub (Figure (PageIndex{4})(b)), can improve the bandwidth of many microstrip circuits. This tool will also compute the resistance of the microstrip, the voltage drop, and the power. When cascaded with high impedance quarter-wavelength transmission lines, the radial stub can provide an effective decoupling network for microwave. 96D/H) Zo = Single Ended impedance. Finally, there is a bandwidth that can be defined in the frequency domain (units of Hz). Microstrip Characteristic Impedance Calculator Using a Formula by Brian C. 8. Calculate the Differential Microstrip Impedance of a transmission line based on the the distance between the strips, height of the substrate, trace thickness and dielectric constant of the substrate. Use the following equation to calculate the impedance of a microstrip trace layout. Either the desired impedance at a specific frequency is used to determine the waveguide width, or the width is entered and the impedance is calculated. Edge Coupled Stripline Differential Impedance Calculator. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. This calculator is designed to calculate the characteristic impedance of a broadside couple stripline (see diagram below). The image below shows the calculated real part of the characteristic impedance of a microstrip and stripline on FR4 (Dk = 4. The plots show the magnitude and phase of the input impedance. The Keysight Printed Circuit Board Trace Impedance Calculator (PCBCalc) app computes the characteristic impedance and sizes of typical printed circuit board trace geometries. Electromagnetic Compatibility Laboratory Microstrip Impedance Calculator Provide values for H, T, W and the relative permittivity of the dielectric and click the button. 4mil and the dielectric thickness to the first intermediate layer (this is a 4-layer board) is 6. It renders fairly accurate results suitable for use in circuit board manufacturing and engineering analysis. There are four different types of impedance used in characterizing differential trace impedances. This limits the use of ƛ/4 microstrip stepped-impedance resonators in low-frequency filter applications. 4. A great example is the surface microstrip which forms on the outer layers of the PCB. The calculated impedance, Z, that is compared against the measurement impedance uses the series impedance of the slot calculated in the circuit shown in Figure 5. Patch antenna with a quarter-wavelength matching section. A solution to the problems of microstrip is coplanar waveguide (CPW) shown in Figure [Math Processing Error] 3. Using this formula, you can calculate the characteristic impedance of a. Microstrip Impedance Calculator: Provide values for three of the four parameters H, T, W, Z0 and the relative permittivity of the dielectric. The T match circuit gets its name because the circuit topology looks like the letter “T”. A. *Comparisons show minimal differences to ADS linecalc and Polar Instruments Quicksolver industry standard tools. 1 W/H 3. Basic Calculator. 2. 4. For example, if you wish to input "25000000", just type "25M" instead. Such a microstrip is constructed with two traces referenced to the same reference plane with a dielectric material between them. Z = R + jX, where j is the imaginary component:. Microstrip impedance calculator Mixer spur calculator mmWave Link Budget calculator Noise Figure/Temp converter Optimal Mitre calculator Path loss calculator. EasyEDA directly supports controlled impedance designs for 4 and 6 layer PCBs only. I have a question. 1< W/H < 3. 3 Filling Factor; Microstrip has conductors embedded in two dielectric mediums and cannot support a pure TEM mode. Download a free microstrip taper calculator worksheet. High-quality circuit boards as prototype and series at reasonable prices. Assuming that there is no loss in the transmission process, the characteristic impedance of the antenna can be expressed by the distributed capacitance C per unit length and the phase velocity Vp:Overview. Stripline vs. Microstrip Max Current Calculator. Microstrip Mitred Bend Formula or Equation. Substrate Height (H) in mils. Figure 7. 1 to 3. Simons, "Coplanar Waveguide Circuits, Components, and Systems", Wiley. This form of microstrip is composed of two traces. g. The bottom line is: check with your fabricator when planning a 4-layer PCB stackup with 50 Ohm. to NFThe coaxial cable, along with the balanced two-wire, is the most common type of transmission line used in RF communications. Input Zo, and click on [ Synthesis ] button. This calculator uses JavaScript. The plots show the magnitude and phase of the input impedance. to NF RF and Wireless tutorials WLAN 802. The tools from Cadence can help designers create, simulate, and analyze microstrip. Go to our microwave calculator page, our microstrip calculator does this calculation for you! It's time for a Microwaves101 Rule of Thumb! For pure alumina (ε R =9. This calculator can calculate the impedance and propagation delay of the embedded microstrip. Edge Coupled Stripline Impedance Calculator. Using the formula above, we can calculate the characteristic impedance of the microstrip transmission line as follows: Zo = 87 * ln(5. 3: Normalized characteristic impedance and normalized effective permittivity of a microstrip line as a function of u = w / h. g. 1mm FR4 in between yealds about 50 ohms. Z o is the impedance of an individual trace. Following equations or formula are used for this microstrip patch antenna calculator. 4 GHz, microstrip line feed. Basic Calculator. 2. Microstrip patch antenna input impedance in the fundamental mode (i, j, k) = (1, 0, 0). This calculator provides accurate microstrip transmission line analysis and synthesis. Note the stub is attached in parallel at the source end of the primary line. For 25 ohms, we calculate 31 mils line width and 7. Microstrip Transmission Line Models. coupledmicrostrip = coupledMicrostripLine creates a default coupled microstrip transmission line with a Teflon substrate and default properties for a resonating frequency of 1. 8. Coupled Microstrip Analysis/Synthesis Calculator. Embedded Microstrip. This value was. 5. (2) When the line width (w) of the characteristic impedance (Zo) is calculated. 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. If there is something in the microwave universe that you need a different calculator for, drop us a note and we'll see what we. 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. Just enter the given values for trace thickness. coupledmicrostrip = coupledMicrostripLine (Name=Value) sets Properties using one or more name-value arguments. PCB Structures / Discrete Structures / Signal Management. Click the button corresponding to the characteristic impedance to calculate its value. Line Width (W) in mils. Output. An embedded microstrip can be constructed using a microstrip with a solder mask. 1< w/h < 3. (18) Topic 59: Input Impedance/Admittance The equation for input impedance can be defined as a function. Ensuring impedance-controlled routing also requires knowledge of the substrate’s dielectric constant and your required trace width. Calculate Microstrip impedance for given PCB parameters. These calculators will return an impedance value for pairs of trace width, substrate thickness, and copper weight values. This tool is designed to calculate the correct dimensions of a microstrip patch antenna if the operating frequency and the dielectric constant of the material used, is known. 5 mil and the impedance value is only affected typically by 2 ohms. example. Lots of calculators can do embedded microstrips, so you can see for yourself. Edge Coupled Stripline Differential Impedance Calculator. A microstrip width calculator can calculate the width of a microstrip. The effective dielectric constant drives the length of the taper, this effect was not. Impedance calculation. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. This assumes ~0 trace thickness. A cross-section of a microstrip transmission line is shown below. For typical PCB parameters (ε r = 4, H 1 = 61. Altium Designer’s differential line impedance calculator will set up your impedance-controlled differential pair routing widths for you. Radio Frequency Engineering Calculator. The solver is quasi-static because the solution does not include the high-frequency dispersion that takes place in microstrip lines (higher concentration of fields in a dielectric with higher dielectric constant at high frequencies).