6 mils line width, and the effective dielectric constant is 6. The Smith Chart achieves this by superimposing a grid on S11 that maps load impedance. The free space path loss is the loss in signal strength of a signal as it travels through free space. Clemson Vehicular Electronics Laboratory: Transmission Line Impedance Calculator. Transmission Line Reflection Calculator TRY TOOL . 35/fmax. Just enter the given values for trace thickness. Added calculation for Electrical Length as Air Line equivalent; Added calculation for Delay time ; Known Issues: Norton (Symantec) false positive. 2. 2. As seen here:PCB Trace Width Calculator This tool uses formulas from IPC-2221 to calculate the width of a copper printed circuit board conductor or "trace" required to carry a given current while keeping the resulting increase in trace temperature below a specified limit. Douville and D. Microstrip Impedance Calculator. The edge couple differential microstrip transmission line is a common technique for routing differential traces. For example: Yellow Violet Red Gold: 4 7 x100 ±5% = 4700 Ohm, 5% tolerance. The length of a half-wavelength dipole can be calculated by the given formula: L =. This is a required field. Access Rogers' calculators, literature, technical papers and request samples on your smart phone or tablet through the ROG mobile app. The microstrip line is a commonly used. Usually Microstrip separated from the ground by using dielectric substrate. In addition, our bandpass calculator reduces the effort thereof. Microstrip Crosstalk Calculator Stripline Crosstalk Calculator. This picture is true. The MWI-2017 Microwave Impedance Calculator software doesn’t replace sophisticated. deepcold said: thanks. Inductance of microstrip lines Microstrip lines used as shunt inductors Application Note AN258, Rev. P. 3): fHigher-Microstrip = c/(4h εr − 1− −−−−√) = 10. The length of a half-wavelength dipole can be calculated by the given formula: L =. Where, P A = Power output of Port 2. f if the frequency. The relation between the R, Zo, and amount of power division is given by the following formula. 4: Normalized even-mode and odd-mode effective. Coplanar Waveguide With Ground Characteristic Impedance Calculator. For example, if you wish to input "25000000", just type "25M" instead. So two estimates have been calculated for the frequency at which the first higher-order. Using this formula, you can calculate the characteristic impedance of a. (© CC BY SA 3. Conductor is assumed to have zero thickness and to have uniform height. A stripline is similar to the microstrip except that the flat conductor is now inside the. 3 shall be used. It was found that the microstrip showed more benefit than the CBCPW when comparing a smooth copper to a rough copper surface for insertion loss. i hope you understand. This calculator finds both odd and even transmission line impedance. 8. You can build an RC low-pass filter with a cutoff frequency of 1 kHz using a 3. 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. INPUT DATA. 0075e-6) creates a microstrip transmission line with thickness of 0. Figure 5. Microstrip Line Calculator Welcome to this engineering tutorial where we will explore the concept of a microstrip line and its calculation. 7E-6 [Ω · cm] L is the trace length [cm] T is the trace thickness [cm] W is the trace width. Wire over Ground Calculator. h is the height of the microstrip line above the ground plane. Dielectric loss in a PCB transmission line. Calculator 1: This calculates the Resonant Frequency of the LC tank circuit by entering the inductance and capacitance values. Grieg and H. microstrip returns a microstrip transmission line object whose properties are set to their default values. The following table compares bench mark values used by Polar Instruments with the results obtained. Coplanar wave guide. Atwater, “Simplified Design Equations for Microstrip Line Parameters”, Microwave Journal, pp. 4: Microstrip Transmission Lines. The TEM wavelength is denoted by the lambda (λ), and the unit of the TEM wavelength is usually represented in nm/µm/mm. Microstrip Calculator computes a microstrip's Effective Dielectric Constant and Characteristic Impedance. Go to the. 04/03/2007: Microstrip Patch Antenna: From Simulation to Realization added in the TutorialsTools section. Edge Coupled Stripline Differential Impedance Calculator. A better estimate of the frequency where the higher-order microstrip mode becomes a problem is given by Equation (4. Transmission Lines – Microstrip, Coplanar, and Coax. Our basic version of eCalc is available for free online and is useful for performing simple calculations. A microstrip transmission line consists of a narrow metallic trace separated from a metallic ground plane by a slab of dielectric material, as shown in Figure 7. If there is an insulator around the wire then this calculator will be an estimate. The best ECAD software will include a field solver-based model. Changed the microstrip impedance calculator formula to a complex version for accuracy. The shape of microstrip antenna can be rectangle, square, ellipse, circle, triangle, ring, pentagon, or their variations4–6. Therefore doubling the thickness cuts the metal loss in half, but does nothing to loss tangent loss. If the ratio (L/W) is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. The calculator below uses Wadell’s. Low power handling. 671; thus Z 0 = 48. The spacer material is. Don’t forget to check out our other calculators on our site and also our. This is the basic principle of microstrip and stripline directional couplers. ( 0. Crosstalk is unwanted coupled energy between traces. 12LNO/0. Amongst them are a Smith chart s-parameter plotter, a lumped element balun designer, a microstrip calculator, a mixer spurious product calculator, and thermal dissipation calculator. Identify best matched Rogers' bonding material by sorting according to design attributes. This value is usually calculated by discounting any obstacles or reflections that might occur in its path. Coil Inductance Calculator. There are four different types of impedance used in characterizing differential trace impedances. Description. When designing with transmission line elements, whether with microstrip, stripline, waveguide, or coaxial cable, it is sometimes necessary to create lumped element equivalents for shunt and series capacitors and inductors. There are two types of cross talk forward and backward crosstalk. Conductor is assumed to have zero thickness and to have uniform height. The. Email: info@multi-circuit-boards. & C. As was mentioned earlier, this is the dielectric loss in units of dB per unit. Several people have developed procedures that can be used to synthesize microstrip lines. The surface finish is neglected. 1 of the Microstrip Calculator using H2 in place of h, εr,eff can be computed as specified in Eq. Transmission-Line Calculator. This is a natural way to implement a transmission line on a printed circuit board, and so accounts for an important and expansive range of applications. 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. An embedded microstrip is a microstrip transmission line or flat conductor separated from the ground place via a dielectric material. Compute the height, width ratio, impedance and dielectric constant of a microstrip transmission line using Pasternack's online tool. Access technical papers, white papers, calculators, tools and more for circuit laminates, prepreg and bonding materials. filter = filterHairpin (Name=Value) sets Properties using one or more name-value arguments. Microstrip Characteristic Impedance Calculator Using a Formula by Brian C. Their progress is diffe rent due to their narrow capacity and inefficiency [1] Fast and slow design is important when prototyping antennas for consummation calculation. However I've just tried a couple of online microstrip calculators, and neither complains for er ratios even below 1. Width. Loss increases with distance, so understanding the FSPL is an essential parameter for engineers dealing with RF communications systems. When two transmission lines are placed close to each other, the electromagnetic field interactions of each line cause power to be coupled between the two lines. It is similar in function to capacitors and inductors but only for very high frequencies. 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. The characteristic impedance (Z o) of a microstrip transmission line can be calculated using the active calculator or the equations at the bottom of the page. The relation between the R, Zo, and amount of power division is given by the following formula. This calculator is designed to calculate the characteristic impedance of an edge-coupled microstrip. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Rectangle Loop Inductance Calculator. This calculator is designed to compute the maximum allowable current that can flow through a stripline. 1: Microstrip transmission line structure and design parameters. 542 mm, a substrate height of 1. Access Rogers' calculators, literature, technical papers and request samples on your smart phone or tablet through the ROG mobile app. To use this tool, enter the values for. Reset. The IPC Formulas and Wadell’s Method. The propagation delay of the microstrip line can also be calculated, as per Eq. For this reason, trace width is important in the design of striplines. EEWeb offers a free online broadside coupled stripline impedance calculator. Ground plane is assumed to be perfectly conducting and of infinite extent. TransLine. For example, a maximum frequency of 100 MHz corresponds to a. This calculator helps determine the correct values of the inductance (L) and capacitance (C) of an inductor and capacitor to be used in a Butterworth LC bandpass filter. Three conducting strips are attached to the center disk at 120° apart from each other. 05/25/2007: Printed Dipole Antenna using. Units do not matter as long as they are consistent - use the same units for w, h, and t. H (Dielectric thickness) : The Smith Chart graphically maps S11=reflection coefficient= (ZL-Z0)/ (ZL+Z0) to Load Impedance (ZL), normalized to Z0 (source impedance = center of chart). These dominant modes are for this case. Crosstalk occurs when a signal "jumps" from one trace to another, a phenomenon that is unintentional and often unwanted. Differential microstrip impedance calculator; Differential stripline impedance calculator; If you want to get more accurate calculations, and you want to account for more advanced challenges like copper roughness, you will need a more advanced calculator. 2 of the Microstrip Calculator, h=H1 and b=H2-H1. A coplanar waveguide calculator will operate in one of two ways. Microstrip Crosstalk Calculator. We invite you to voice your opinions. ; You can use the formula provided to calculate the capacitance of a microstrip when you have values for εr, A, and d. Line Thickness (T) in mils. It renders fairly accurate results suitable for use in circuit board manufacturing and engineering analysis. Microstrip Calculator computes a microstrip's height/width ratio, impedance and relative dielectric constant for a microstrip transmission line. The PCB internal/external trace resistance shall be calculated according to the following formula: R = (ρ * L / (T * W)) * (1 + α * (TAMB – 25 °C)) Where: R is the trace resistance [Ω] ρ is the resistivity parameter, whose value for copper is 1. HFSS Waveport Size Calculator Figure out the correct waveport size to use in HFSS for a microstrip line feed. Eq. This calculator can calculate the impedance and propagation delay of the embedded microstrip. Overview. The electrical parameters may be determined from specified physical parameters, or the physical parameters required to meet a given set of electrical parameters may be found. The width of the conducting layer is crucial in determining the radiation intensity. The guide I'm using as a reference is from Texas Instruments. The microstrip realization is typical of most directional couplers in that it comprises two parallel signal lines with the electric and magnetic fields of a signal on one line inducing currents and voltages on the other. Typical realisation technologies are printed circuit board (PCB), alumina coated with a. In the circular case, instead of the operating frequencies being related to rectangular resonances, they will be related to circular resonances defined by cylindrical Bessel functions. • Coplanar wave guide. It seems likely JLC is using the latter formula. Some research groups have studied about the equations for the formulation of microstrip radial stubs [27, [29] [30] [31]. 0300) creates a microstrip line of length 0. Enter the width and height in any units and get the result with formulas and SI prefixes. As the surface roughness goes from low to high, the conductor losses also increase. RF calculations and conversions include metric-standard, link. 3) (4. This calculator uses JavaScript and will function in most modern browsers. S-Parameter Analysis and Plotting; Active Circuit Bias Design; Cascade Noise and IP3 AnalysisStripline Layout Propagation Delay. An educated guess for Keff in any microstrip line is that 70% of the fields are contained in the substrate, so Keff is ~9. Sorted by: 1. Following is the list of useful converters and calculators. If you consider the PCB trace as a lossless transmission line, the characteristic impedance Z0 = L C−−√ Z 0 = L C but the velocity factor is inversely proportional to L ⋅ C− −−−√ L ⋅ C (where L & C are per unit length). Microstrip antennas fluctuate in impedance hanging on the plangency frequency, polarity, prototype, and explicit patch composition. Width (w) Trace Thickness (t) Dielectric Thickness (h) Relative. It is suitable for the production of flat structure transmission lines of microwave integrated circuits. Calculates the impedance of a microstrip. Our RF and microwave calculators and converters will provide the figures you need for your radio frequency engineering needs. 37 mil), the deviation of the calculated. What is a Microstrip Line Calculator? The microstrip line calculator helps to determine the length and width of a microstrip line for characteristic impedance and electrical length. The microstrip coupling lines provide the input/output coupling and its strength are determined by the gap width and length (S 2, L 2 and S 3, L 8). A DIY Dual Directional Coupler, 5 - 1500 MHz, 10 / 20 dB; A DIY Dual Directional Coupler, 5 - 2850 MHz, 17 ±1 dB; Understanding Directivity; How to Measure Directivity of Directional Couplers; Microstrip. Quarter Wave Transformer Impedance Calculator. Free Space Path Loss Calculator. Stripline Layout Propagation Delay. Assuming I am thinking about this correctly, this is looking really unlikely: Set embedded microstrip to match the embedded stripline using 1. 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. This is achieved by designing a friendly graphical user interface (GUI) for. Instructions are below the calculator and don’t forget we can make and test your controlled impedance printed circuit board too. This calculator finds both odd and even transmission line impedance. 0046) creates a standard microstrip transmission line with a width of 0. This calculator finds both odd and even transmission line impedance. "Antenna Near Field & Far Field Distance Calculator. 2 enable the electrical characteristics to be determined given the material properties and the physical dimensions of a microstrip line. Use several of them and compare. Passive band pass filter 1st order. Capacitance in pf/inch. Calculating Inductance and Capacitance of a Bandpass Filter. The "optimum" mitered bend equations for microstrip were found empirically way back in the 1970s. 1t for W/h ≤ 1 and Wr = W + 1. 08. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. 60. Running this code with Octave/Matlab is a better way to design a hairpin filter than my calculator but it takes tens of minutes per simulation, depending on the frequency range, mesh size and of. Some are based on look-up tables, some completely hide their algorithms. For a more accurate analysis, use ANSYS HFSS or similar programs. The calculator shown below uses Wadell’s equations for differential impedance, which can be found in the seminal textbook Transmission Line Design Handbook. Łucja Zaborowska, MD, PhD candidate. Version 6. Calculators and applications for online RF analysis and synthesis Ease your RF and microwave development with Marki Microwave Tools. Rectangular Waveguide Sizes. Skin Depth Calculator. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. The patch antenna, microstrip transmission line and ground plane are made of high conductivity metal. C is the capacitance of the microstrip. A. 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. W is the width of the microstrip trace. 151] = 2. Inductance: L =. In my fab, if I use 0. The Smith Chart achieves this by superimposing a grid on S11 that maps load impedance. Co: capacitance per unit length. A two part calculator which gives ideal and preferred value resistors, showing most formulas used and a link to the others. 60. Re: Microstrip feed line. Description. First the model of the microstrip patch antenna has to be drawn in HFSS. Rectangle Loop Inductance Calculator. Top layer of the PCB, 50 Ohm microstrip line transmitting 650 MHz/1. where Z 0,surf can be computed as specified in Eq. A calculator for solving the maximum current a microstrip can handle. In most practical cases, the dielectric substrate is electrically thin, that is, h ≪ λ. It also helps to know characteristic impedance. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. The phase is mostly + 90 ∘ or − 90 ∘, indicating that Zin is mostly reactive. Visit to learn more about our other electrical engineering tools. In addition to the suite of free design, verification, and analysis tools shown below, EEWeb is the home for experienced and novice designers alike to share tips and to ask and answer questions via our forums. Metal loss is reduced by thicker substrates, and is almost inversely proportional. Using the 3 dB and 60 dB bandwidth the above calculator can calculate the shape factor and quality factor for any microwave band-pass filter. Microstrip Transmission Line Models 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:Microstrip Antenna Inset Feed Calculator. The capacitance calculated using this tool is the capacitance between a flat conductor and the ground plane over the conductor length. In this model, the interior region of the patch antenna is modeled as a section of transmission line. 1 3. Phase Noise to Jitter Calculator. Understanding these structures (microstrip, stripline, and coplanar) can be fruitful from the PCB design point of view, for the designer as well as the fabricator. 1. Microstrip lines are used to convey microwave -frequency signals. Compared to waveguides, microstrip is generally has a lower power handling capacity, and higher losses due to the fact that it is not enclosed. Inductance is the ability to store energy in a magnetic field, and coils are a common way to create inductance. EEWeb offers a free online broadside coupled stripline impedance calculator. (© CC BY SA 3. Stripline Crosstalk Calculator Introduction. 1. For example, if you wish to input "25000000", just type "25M" instead. With PCBWay impedance calculator, you can calculate the approximate impedance of your PCB / high frequency circuit board. In this design note we will stick to a width of. 4mil and the dielectric thickness to the first intermediate layer (this is a 4-layer board) is 6. In general, θ = ( π / 2) ( f / f 0). Passband insertion loss measured well within the target specification. Learn how to design microstrip and CPW power dividers using Keysight EEsof EDA tools in this technical overview. 5 mils (241 microns). Microstrip Impedance Calculator. High-quality circuit boards as prototype and series at reasonable prices. Dual Stripline. Calculates with the characteristic impedance of the system and ratio of the power at the output to get the impedance of the various transmission lines that make up the Wilkinson Power Divider. Conductor is assumed to have zero thickness and to have uniform height above ground. In CBCPW, not. 2 (t / h) 2 for W/h > 1. For an embedded (internal) microstrip, the formulas provided in paragraph 4. To use this tool, enter the trace width, thickness, ambient temperature, temperature rise, and the microstrip length and click the "calculate" button. In the lumped and distributed form, they are extensively used for both commercial and military applications. There is also a dielectric material placed above the conductor. Resources listed under Antenna Calculators category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. 11. used to determine the radius of circular microstrip antenna. 3%, are. 39 for the effective dielectric constant. TransLine. R = Zo (K + 1/K) Where, K2 = P3 / P2; (P3 - power at port 3) (P2 - power at port 2). 2. Use our microstrip patch antenna calculator; Patch antennas can also be circular or elliptical for a given operating frequency. We use an interpolation approach. 1 - 14. II. This parameter is used for the loss calculations. The resonant frequency (rf) of a circular patch antenna is approximately given without considering the effect of probe radius by [1]: e r nm r a K c f 2S H * (1. 72mil. Cross-hatched copper plane in a flex stack-up for controlled impedance. 3 shall be used. 1-10. 76mm Rogers4350B substrate at a certain frequency and with 35 micron copper thickness, line width becomes 0. The lateral dimensions, however, are well controlled being photolithographically defined and then etched. Description. The effective dielectric constant equation is from: M. 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. RF Converters and Calculators. Choose from different models of microstrip, edge coupled, wire, embedded, or stripline,. ( 0. 37mm for a 50 ohm. 04/02/2007: Ansoft Designer Planar EM Simulation of a microstrip transmission line added in the TutorialsTools section. By adding the formulas of the. As the name suggests, the length of this transmission line if fixed at a quarter of the wavelength (λ/4). 4. One option for impedance matching is to use an inset, as shown in the image below. Coplanar wave guide with ground plane. This calculator computes the trace width of a stripline if the maximum current, trace thickness, temperature rise, ambient temperature and length are given. If output characteristic impedance has an output value than input impedance, then there is limited current flow. tr = 0. Pasternack's RF Calculators and Conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Version 2. TEM wavelength is the distance between two adjacent peaks or troughs of adjacent cycles of the TEM wave. The substrate parameters (ε r and h) are. Model Setup. THESE FORMULAS ARE. Microstrip antennas are becoming very widespread within the mobile phone market. These equations are relatively simple compared to other transmission line geometries, comprising only 2 interrelated equations for the microstrip impedance and. The input impedance, Zin, of the shorted microstrip line is shown in Figure 3. 631-647, Aug. Differential Impedance of. 1. Equation 11. In our recently revised filter spreadsheet (version 2B updated January 10, 2005) we've added plot capabilities inside. Calculate the width of a microstrip transmission line with this online tool. Description. E. Use this calculator to analyze or synthesize microstrip transmission lines with different substrate parameters, such as relative permittivity, loss tangent, conductor resistivity, height, thickness, frequency, and angle. The formula is: Propagation Delay = Distance / Propagation Velocity What is the. 6. **Note: Like our microstrip line impedance calculator, all of our RF calculators allow SI prefix input. 2): fHigher - Microstrip = c/(4h εr − 1− −−−−√) = 10. A filter is a reactive network that passes a desired Microstrip lines have a quasi-TEM mode of propagation, making it easy to realize various lumped-elements. Fig 1: Equilateral triangular patch antenna with inset feeding Abstract: Triangular microstrip antenna is commonly used in wireless communication. Any book for microstrip antennas should have the formulas you need to find the location of the feed point, to obtain precisely 50Ohm input impedance. A modification of the Marchand balun model is presented and the designed planar microstrip circuit is fairly simple and practical without complex layers. The plots show the magnitude and phase of the input impedance. PI Network Impedance Matching. To calculate the width of a microstrip, you will need some parameters. All About Circuits is the largest online electrical engineering communities in the world with over 700K engineers, who collaborate every day to innovate, design, and create. The microstrip patch antenna calculator determines the length (L) and width (W) of a rectangular microstrip patch antenna for a given resonant frequency or vice versa. Transcalc. This hairpin must be printed on one side of a standard double sided 1. The substrate parameters (ε r and h) and the frequency of interest are required. This tool will also compute the resistance of the stripline, the voltage drop on it, and the resulting power dissipation. This calculator requires symmetry in the trace widths and location between plane layers. Microstrip Filter Design PathWave Advanced Design System (ADS) Background Microwave filters play an important role in any RF front end for the suppression of out of band signals. Fig. The procedure given below explains how to use Linecalc to analyze such a structure. Figure 3. The TEM wavelength (λ) depends upon the frequency and relative permittivity (εr) medium (like waveguide/ stripline. Create the microstrip line in CADFEKO using the dimensions obtained in Step 1. 1. 2 Ratings. 7 characteristic impedance 50 Ω . The spacer material is. eu. accuracy microstrip calculator i'm sorry. 1kOhm, 1% tolerance: Brown Black Black Brown Brown. 71. Polar or rectangular grids only allow direct reading of S11. Noise Conversion Calculator. Stripline Calculator. Engelmann from the Federal Telecommunications Laboratories of ITT, presented as a competing printed circuit line. 2. Then, multiply the values of L and l by 0. Compute the height, width ratio, impedance and dielectric constant of a microstrip transmission line using Pasternack's online tool. Try This New Tool. everything RF has created a series of RF calculators to help engineers and students with common calculations that they need to conduct frequently. It consists of a rectangular metal patch on a dielectric substrate and is excited by a voltage source across the metal patch and the bottom ground plane of the substrate. Enter the target impedance, trace thickness, dielectric thickness and relative dielectric constant to get the width of the microstrip and its radiation. Generate Kicad footprintGenerate SVG file. The coax is a good way to create a transmission line. Tip: Use a planar multilayer substrate for the dielectric layer and ground plane. This calculator takes trace thickness into account and is not limited to a range of w / h ratios. Metal loss is reduced by thicker substrates, and is almost inversely proportional. This tool will also give you the magnitude of the coupled voltage between. If the dielectric constant of the material is not known, you can choose to put in the velocity of. The skin effect is a phenomenon that increases the effective resistance of the microstrip line and boosts ohmic losses. J. Technical Overviews. In microstrip, the width of the conductor and thickness of the dielectric substrate impact impedance. There are two types of crosstalk: forward and backward. Active calculator for microstrip transmission line based on a equation by Brian C Wadell, giving characteristic impedance and effective dielectric constant, with equations used. A differential stripline pair refers to two traces located between two reference plane layers, which are routed as a differential pair. Results indicate that perhaps the basic parameter is the normalized thickness of the antenna. Interestingly, for a given geometry model, the delay constant in ns/ft is a function only of the dielectric constant, and not the trace dimensions (see Reference 6). $egingroup$ So basically your answer shows that the JLCPCB impedance calculator results are generally in the same ballpark as the proven field simulators. i am talking about the small gap between the patch and microstrip. Color-Code. Provide values for H, T, W and the relative permittivity of the dielectric and click the button corresponding to unknown parameter Z o to calculate its value. Inductance Calculators. Such a circuit will deliver an exact cutoff frequency of. h = rfckt. The magnitude of the coupled voltage between adjacent traces is also provided. h is the height of the microstrip line above the ground plane. 2. To learn more about the capabilities of EMI Analyst, sign up to access our download area or.