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. When in doubt, use 1 for copper, . Microstrip Patch Antenna Calculator Calculate dimensions and edge impedance for desired resonant frequency. microstrip (Name,Value) sets properties using one or more name-value pairs. A taper with ten segments is chosen and in the table below the. 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. 05/25/2007: Printed Dipole Antenna using. 517 εr] The expression for εe is accurate to better than 1% for 8 < εr < 12 and 8 ≤ Z0 ≤ (63 −. Width (w) Trace Thickness (t) Dielectric Thickness (h) Relative dielectric constant (εr) Calculate Reset Result Single Ended Impedance Ω Propagation Dealy ps/inch This calculator helps you compute the characteristic impedance of a microstrip, a flat conductor suspended over a ground plane with a dielectric between them. The substrate parameters (ε r and h) are. The twisted pair helps create a more uniform inductance and capacitance per unit length of wire to ensure a constant impedance, by keeping the return path as close to the signal as possible. but I'm looking at something that has formulas and i want to calculate the width of the feed line not the square patch. In both cases, you’ll need to enter your stackup information into the calculator to get accurate results. The microstrip belongs to the group of parallel-plate transmission lines and consists of a single ground plane and anStripline Capacitance. Overview. Edge-Coupled Traces. dBm to Watt converter Stripline Impedance calculator Microstrip line impedance Antenna G/T Noise temp. f - Frequency. The nice part about coax is that it can be bent and flexible unlike most pcb transmission lines. Microstrip filters are built as a carefully defined pattern on a PC board. This calculator is designed to calculate the characteristic impedance of a broadside couple stripline (see diagram below). ANSOFT CORPORATION HFSS FIELD CALCULATOR COOKBOOK INTRODUCTION feature of Ansoft’s HFSS Version 7. structural defects in the etched microstrip lines. It is similar in function to capacitors and inductors but only for very high frequencies. Scientific Calculator. 2. Characteristic Impedance of the System (Z0) Ohms. The maximum PCB track length is then calculated by multiplying tr by 2 inch/nanosecond. 66 Minor bug fixes and corrections. 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. Connect the third microstrip line from the port 2 to 4 which forms a tee network. The calculator calculates the effective dielectric constant, loss, and effective impedance of the microstrip line based on the nonhomogeneous nature of the structure and the frequency of interest. In all cases, the current is assumed to flow in the outer surface of the. Before, working with a trace impedance calculator, one should be aware of which equations the calculation. 1 shows a pair of coupled microstrip lines. This can be achieved by regulating the inner and outer diameter of the coaxial cable, along with the. The required inputs are the Dk value for the dielectric constant of the PCB substrate, and the. You can build an RC low-pass filter with a cutoff frequency of 1 kHz using a 3. See Wheeler for equation. Multiply the result by the square root of the ratio of (1 + (2 * h / w)) to (1 – (2 * h / w)). txline = txlineMicrostrip (Name,Value) sets Properties using one or more name-value pairs. In design, the physical dimensions must be determined given the desired electrical properties. In fact, a stripline is often described as. 0261 kHz. Coil Inductance Calculator. 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. Large selection of online interactive calculators for RF design, including attenuators, capacitance, resonance, RF traps, and microstrip impedance. 0016 and E r =12. Dimensions are in meters. , they. This calculator helps you compute the characteristic impedance of a microstrip, a flat conductor suspended over a ground plane with a dielectric between them. 3 shall be used. P. 577e-9 H. Technical Overviews. Microstrip Line Calculator Welcome to this engineering tutorial where we will explore the concept of a microstrip line and its calculation. This concept was undeveloped until the revolution in. The microstrip width calculator uses the following parameters to calculate: Dielectric thickness (h) Target impedance (Zo) Relative dielectric constant. Wire over Ground Calculator. High and low pass filters are simply connected in series. This works by taking advantage of coplanarity between the antenna and the feedline, which produces. 8 Updates & Additions: 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. Calculadora de Líneas Microstrip S. Take note that this assumes that the distance between the conductor and the planes is not the same for both reference planes; hence the asymmetric term. The size of a microstrip antenna is inversely proportional to its frequency. The calculator below uses Wadell’s. 4 GHz, microstrip line feed. There are two types of crosstalk: forward and backward. Microstrip Patch Antenna Calculator Calculate dimensions and edge impedance for desired resonant frequency. Spread the love Microstrip Propagation Delay Calculator Microstrip Propagation Delay Calculator Trace Length (in meters): Calculate Propagation Delay: nanoseconds FAQs How do you calculate propagation delay? Propagation delay is calculated by dividing the distance traveled by a signal by its propagation velocity. Skin Depth Calculator. 1 of the Microstrip Calculator using H2 in place of h, ε r,eff can be computed as specified in Eq. Microstrip lines' primary functions are transferring power from one point to another, dividing or combining power. 7. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. 6 GHz UWB SYSTEMS . Outputs. ; A is the cross-sectional area of the microstrip, typically in square meters (m²). There are two types of cross talk forward and backward crosstalk. TransLine. In CBCPW, not. A rectangular microstrip patch antenna is designed and simulated with CST software using 0. Use an online differential microstrip impedance calculator; Use an online differential stripline impedance calculatorDESIGN DATA FOR YOUR YAGI. Such a microstrip is constructed with two traces referenced to the same reference plane with a dielectric material between them. This calculator will help you calculate the guided wavelength, provided the dimensions of the microstrip are given as well as the velocity of propagation, the microstrip material's dielectric constant, and the input. Here's two references: R. Stripline Layout Propagation Delay. f if the frequency of the RF signals. 293, 50% of the copper removal can be achieved. on1. PCB Impedance-Calculation: Help with the dimensioning of the impedances of your circuit board. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. A microstrip line is a microwave transmission line composed of a single conductor strip supported on a dielectric substrate. used to determine the radius of circular microstrip antenna. 2. Lo: inductance per unit length. There are four different types of impedance used in characterizing differential trace impedances. Model Setup. Then, multiply the values of L and l by 0. This paper describes the use of a logarithmic architecture in the design of microstrip antenna arrays, creating structures with high gain and ultra-wide bandwidth. The default units for all given values, except the subtrate. Calculate the impedance of a microstrip transmission line with a PCB using this online tool. Line Thickness (T) in mils. Overview. HFSS Waveport Size Calculator Figure out the correct waveport size to use in HFSS for a microstrip line feed. Transcalc. Check the higher-up (calculators) page; Chemandy has two other microstrip formulas as well. Ground plane is assumed to be perfectly conducting and of infinite extent. The filter owes its low signal loss to refined formula published in the literature as wellThis calculator is heavilly based on . Remove the solder mask on top of the filter. Calculators. Figure 78 shows the propagation delay versus the dielectric constant for microstrip and stripline traces. In microstrip, the width of the conductor and thickness of the dielectric substrate impact impedance. 1. The edge couple differential microstrip transmission line is a common technique for routing differential traces. Enter one of the three values and the calculator will output the other two. At the same time, the gap between the ground planes and the signal line is widened to retain a 50 Ω characteristic impedance in order to match that of the microstrip line,Both can be realized in microstrip, stripline or even coax, but stripline is the go-to technology for coupled-line couplers. - Tee Attenuator Calculator. I is the current intensity, in Ampere. 0 out of 5. Stripline Calculator. The guide I'm using as a reference is from Texas Instruments. Microstrip is a single trace on the top layer, with no ground close to it on the same layer. This tool will also compute the resistance of the stripline, the voltage drop on it, and the resulting power dissipation. S-Parameter Analysis and Plotting; Active Circuit Bias Design; Cascade Noise and IP3 AnalysisStripline Layout Propagation Delay. Reset. 5 resin). Wire Microstrip Impedance Calculator; Edge-Coupled Microstrip Impedance Calculator; Striplines (relatively-high-frequency) A stripline is very similar to a microstrip, except that the trace is embedded in a dielectric layer (the board substrate), which is itself sandwiched between two ground planes. There's nothing special about microstrip. More complex vari-ations on the basic shapes are frequently used to meet particular design demands and in terms of polarization,a microstrip section. Skin Depth Calculator. 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. The quality factor indicates how selective or non-selective the band pass filter is. coupledmicrostrip = coupledMicrostripLine creates a default coupled microstrip transmission line with a Teflon substrate and default properties for a resonating frequency of 1. When attempting to download & install from Norton 360 (antivirus software) removes the installation program. The tool provides two networks that will have the desired impedence at that frequency. The formulas developed in Section 4. A tool for accurate microstrip transmission line analysis and synthesis, with substrate parameters, physical and electrical parameters, and loss equations. A cross-section of a microstrip transmission line is shown below. For example, if you wish to input "25000000", just type "25M" instead. Our results are optimised for gain, but others may be optimised for bandwidth. 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. Enter the values of trace width (w), trace thickness. If the ratio is about 0. 06/08/2009: EM Talk Store added - find discount microwave engineering components and devices. The right-hand side of Equation (5. The Differential microstrip impedance calculator is used to compute the differential (Zd) and single-ended impedance (Zo) of an edge-coupled microstrip line just by entering the width, separation and thickness of the trace along with the dielectric thickness and constant of the coupled line. 98mil. Useful converters and calculators. T-Match Topology. In some cases, users require a custom impedance value. Email: info@multi-circuit-boards. Because of the symmetry unbalance in Microstrip, all discontinuity elements possessWire inductance Calculator; Directional Couplers. Following is the list of useful converters and calculators. This is the basic principle of microstrip and stripline directional couplers. Microstrip lines are a type of transmission line commonly used in RF and microwave circuits due to their quasi-TEM mode of propagation and flexibility. There are many demands placed on PCB stackup design. 1 3. 331 1 2 5. One should always check carefully whether a calculator implements these equations under the appropriate approximations. 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. Problem Definition 2. Visit to learn more about our other electrical engineering tools and resources. Microstrip antennas fluctuate in impedance hanging on the plangency frequency, polarity, prototype, and explicit patch composition. Calculations provided on this page are a simplified subset from EMI Analyst models. Figure (PageIndex{1}): Directional couplers: (a) schematic; and (b) backward-coupled. Rogers Advanced Connectivity Solutions (ACS) has introduced an updated design program that is free to download called the MWI-2017 Microwave Impedance Calculator, a transmission line modeling tool for electronics engineers (setting up an account is required). A two part calculator which gives ideal and preferred value resistors, showing most formulas used and a link to the others. Visit to learn more about our other electrical engineering tools. In microstrip circulators a hole is drilled in the dielectric slab and ferromagnetic material placed in the hole. 0300) creates a microstrip line of length 0. 2 and compare that to embedded stripline with 1. The differential impedance will be a bit less than 2x the single-ended impedance. Added calculation for Electrical Length as Air Line equivalent; Added calculation for Delay time ; Known Issues: Norton (Symantec) false positive. 6 GHz. To create a 50 Ohm microstrip you need to know: 1) the dielectric constant of the PCB material between the strip and the ground plane; 2) the thickness of the PCB material between the strip and. In the lumped and distributed form, they are extensively used for both commercial and military applications. Ω/mΩ/in. An embedded microstrip can be constructed using a microstrip with a solder mask. So two estimates have been calculated for the frequency at which the first higher-order. 1b shows the coupling scheme of the proposed diplexer. An embedded microstrip is a microstrip transmission line or flat conductor separated from the ground place via a dielectric material. Edge Coupled Stripline Differential Impedance Calculator. Free Space Path Loss Calculator. The relation between the R, Zo, and amount of power division is given by the following formula. The default units for all given values, except the subtrate dielectric, is in millimetres. Do all your RF calculations using this application. most intuitively appealing models for a microstrip antenna. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. The Sierra Circuits Impedance Calculator uses the 2D numerical solution of Maxwell’s equations for PCB transmission lines. That still may not mean the formulae are valid for that range, just that the calculators have not implemented catches for this unexpected range of use. This includes design capture, simulation, and displaying simulation results. A microstrip line is a microwave transmission line composed of a single conductor strip supported on a dielectric substrate. 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. We use an interpolation approach. 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. 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. Click design guide at this link. Calculates dimensions of circular microstrip patch antenna, provided frequency, relative permittivity and height of substrate. D. AppCAD Free Design Assistant Tool for Microsoft Windows. 0046 meters. In the lumped and distributed form, they are extensively used for both commercial and military applications. Enter the target impedance, trace thickness, dielectric thickness and relative dielectric constant to get the width of the microstrip and its radiation intensity. For fixed line impedance on microstrip (such as fifty ohms), dielectric loss is almost constant for any thickness substrate. This document covers the theory, design steps, simulation and verification of various types of power dividers, such as Wilkinson, T-junction, and branch-line. It can calculate low-pass, high-pass and bandpass lumped-element Chebyshev filters, of third, fourth and fifth order (N=3, N=4 and N=5). 1 3. Input impedance (Ohms) Desired output impedance (Ohms) Note: This transformer cable should be electrically one quarter wavelength, or a multiple of an odd quarterwavelength. 4, 5, 4. Calculating Inductance and Capacitance of a Bandpass Filter. ice. To learn more about the capabilities of EMI Analyst, sign up to access our download area or. TransLine. Then the transverse field is dominant and the fields are called quasi-TEM. There are four different types of impedance used in characterizing differential trace impedances. This is the one-way transit time for a microstrip signal trace. This calculator helps translating the color bars from the resistor to its value. 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. Bookmark. A. 2) (5. 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. SAVE & ACCEPT. The free space path loss is the loss in signal strength of a signal as it travels through free space. 8. HFSS Waveport Size Calculator Figure out the correct waveport size to use in HFSS for a microstrip line feed. 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. Don’t forget to check out our other calculators on our site and also our. 6 mm thick PCB. With t = 35 um (typical for copper with plating on a pcb), Z odd drops to 44 ohms, according to LineCalc. 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 can. - Reflection Attenuator Calculator. A variant of coplanar waveguide is formed when a ground plane is provided on the opposite side of the dielectric, which is called finite ground-plane coplanar waveguide (FGCPW), or more simply, grounded coplanar waveguide (GCPW). λ = Signal wavelength in meter (m) = c/f ( where f = signal frequency, C = speed of light = 2. A usable directional. Ratings and Reviews 5. However, these calculators are using curve-fitting models tracing back to the Wheeler and Getsinger era (60's 70's etc). 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. Microstrip Impedance Calculator. 6 ohms and Z even = 110 ohms for your geometry, very close to your result. A Clemson ECE635 Project by Adam Schreiber and Jason Byers. USB traces must be 90 Ohms differential. A stripline is similar to the microstrip except that the flat conductor is now inside the. Stripline. Scientific Calculator. Thanks. 2. 5 GHz. 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. 2. icrostrip line: H. 3048 to convert them to meters. ( 0. RF calculations and conversions include metric-standard, link. Use the following equation to calculate the stripline trace layout propagation delay. 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. Points: 2 Helpful Answer Positive Rating Jun 26, 2008; Jun 26, 2008 #5 H. The Impedance Calculator evaluates single-ended and differential impedance for various impedance models. “468” is the constant used to convert frequency in MHz to feet. Description. One half-wavelength resonator of the high-frequency (f 2) signal path also provides port coupling function for the low-frequency (f 1. 4mil and the dielectric thickness to the first intermediate layer (this is a 4-layer board) is 6. The synthesis portion calculates the required physical parameters to meet desired electrical. Ae = Effective antenna aperture in m 2. 2 of the Microstrip Calculator, h=H1 and b=H2-H1. Microstrip Impedance Calculator; Microstrip 90° Corner Calculator; Networks (mostly RF. 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. This calculator helps translating the color bars from the resistor to its value. PI Network Impedance Matching. This calculator can calculate the impedance and propagation delay of the embedded microstrip. λ is the wavelength of the signal in free space. The transmission line geometries are cross sections and the values calculated are the inductance per unit length. Go to the. The inductance calculated using this tool is the external inductance of the loop bounded by the flat conductor and the ground plane. Access Rogers' calculators, literature, technical papers and request samples on your smart phone or tablet through the ROG mobile app. These formulas provide the conversion. 9 GHz and the magnitudes of S 21 and S 31 are. IEEE defines it as "The loss between two isotropic radiators in free space, expressed as a power ratio. Use our microstrip patch antenna calculator; Patch antennas can also be circular or elliptical for a given operating frequency. The MWI-2017 Microwave Impedance Calculator software doesn’t replace sophisticated. Modeling approximation can be used to understand the impedance of. 5. Transmission-Line Calculator. This picture is true. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. 5. The Number that follows "WR" is the width of the waveguide opening in mils, divided by 10. The microstrip line is a commonly used. Conductor is assumed to have zero thickness and to have uniform height. Microstrip Impedance Calculator. 6 GHz f Higher - Microstrip = c / ( 4 h ε r − 1) = 10. 3 shall be used. 6 mils line width, and the effective dielectric constant is 6. Access Rogers' calculators, literature, technical papers and request samples on your smart phone or tablet through the ROG mobile app. A cross-section of a microstrip transmission line is shown below. Version 2. 1. h (substrate high) : unit. 11. The. 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). To use this tool, enter the values for. Sorted by: 1. This tool is designed to calculate the resistance of a microstrip trace with a copper conductor. 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. Matching T Attenuator A two part calculator which gives ideal and preferred value resistors, showing most formulas used and a link to the others. Following is the list of useful converters and calculators. A coplanar waveguide calculator will operate in one of two ways. For an embedded (internal) microstrip, the formulas provided in paragraph 4. Microstrip. For example, if you wish to input "25000000", just type "25M" instead. The formula is: Propagation Delay = Distance / Propagation Velocity What is the. For an embedded (internal) microstrip, the formulas provided in paragraph 4. RADAR RELATED LINKS. In addition, our bandpass calculator reduces the effort thereof. 24-25. Phase Noise to Jitter Calculator. 631-647, Aug. The microstrip line calculator makes it possible to calculate the characteristic impedance of a microstrip line from the ratio between the width of the line and the height of the substrate as well as the parameters of the substrate. 2. 1 Characteristic impedance of microstrip lines As seen in the previous section it is necessary to know the length and characteristic impedance of a line to determine its equivalent inductance. Some research groups have studied about the equations for the formulation of microstrip radial stubs [27, [29] [30] [31]. 76SR composite as a substrate. 1 Design of circular microstrip antenna The geometry of circular microstrip antenna is shown fig. 151] = 2. Keep in mind that the conversions only hold exactly at one frequency, ω. Microstrip. 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. Output. As such, microstrips are also subject to maximum ratings like capacitor and inductor. The. 4: Normalized even-mode and odd-mode effective. This tool will also compute the resistance of the microstrip, the voltage drop, and the power. There are 3 types of microstrip models to choose from- uncoated, coated, and embedded. This tool helps you create a matching circuit so that optimal power transfer occurs between unmatched loads. hkprakash7 Member level 1. This calculator takes trace thickness into account and is not limited to a range of w / h ratios. Differential Impedance of Microstrip. The skin depth depends upon the operating frequency and resistivity & relative permeability of the material. 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. Compute the height, width ratio, impedance and dielectric constant of a microstrip transmission line using Pasternack's online tool. F. So, the skin effect is higher in rougher conductor strips. This calculator uses JavaScript and will function in most modern browsers. High-frequency circuit designers must often consider the performance limits, physical dimensions, and even the power levels of a particular design when deciding upon an optimum printed-circuit-board (PCB) material for that design. 37 mil), the deviation of the calculated. An example is shown below. Learn more about microstrip antennas and their applications. The substrate parameters (ε r and h) are required. 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. Microstrip filters. For example, if you wish to input "25000000", just type "25M" instead. High-speed designs carry a requirement for controlled impedance, crosstalk control, and the need for interplane capacitance. Using the Microwaves101 microstrip calculator, we see that 50 ohms on 10 mil alumina corresponds to 9. It consists of rectangular substrate and the metal trace layer as shown in Fig. Use port numbers 1 and 2 for the first microstrip line and connect another microstrip line from ports 2 to 3 which forms a series connection. 1t for W/h ≤ 1 and Wr = W + 1. The transmission line types and the reference of their mathematical models are listed below: • Microstrip line: – H. docx 1 / 16 Microstrip Antennas- Rectangular Patch Chapter 14 in Antenna Theory, Analysis and Design (4th Edition) by Balanis Shown in Figures 14. . It renders fairly accurate results suitable for use in circuit board manufacturing and engineering analysis. 3 GHz) rectangular pulses. To use this tool, enter the values for. Equation Source: Ulaby "Fundamentals of Applied. The formulas are useful outside the range indicated, but with reduced accuracy. 1. The simplified test bench setup shown in the above figure is used to measure the cross talk between two microstrip lines on a grounded substrate. Microstrip Impedance Calculator. This calculator assumes the distance between the two reference planes to be an equal distance. Phase Noise Under Vibrations Calculator IP3 Intermodulation Calculator. Design, development and small scale manufacture of simple RF and Audio items. Compute the height, width ratio, impedance and dielectric constant of a microstrip transmission line using Pasternack's online tool. 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. Theory of coupled line couplers For two transmission lines coupled together to form a four-port. This RF filter calculator is used for microstrip filter calculations. Therefore doubling the thickness cuts the metal loss in half, but does nothing to loss tangent loss. O. 5 mils (241 microns). by . This means that on each side of the feed line there should be a distance of 1/2 the microstrip width on each side of the microstrip between the microstrip feed line and the patch antenna. Differential microstrip impedance calculator is an online electronic tool to measure the opposition to alternating current. Active calculator for microstrip transmission line based on a equation by Brian C Wadell, giving characteristic impedance and effective dielectric constant, with equations used.