C Excellent amplitude and phase balance. Fig 1: Structure of Inset feed Rectangular Patch Antenna In this design of rectangular Microstrip Patch Antenna design a dielectric material of FR4 is used with the height of 2. Example 1. Some of the research papers to calculate the gap size (g) of the inset feed microstrip antenna are enclosed for your reference. 2. This tool calculates backward crosstalk which is usually the dominant crosstalk component. Microstrip lines' primary functions are transferring power from one point to another, dividing or combining power. Conditions (weak microstrip mode, low side capacitance): S>>T, H>T, 0. This can be set to zero, but the calculated loss will not include conductor losses. Before doing so, the width and length have to be determined. Follow @SpokCa. These are considered to be standardized impedance values with cables readily available. Click here to go to our page on microstrip. This calculator calculates the reactive near field distance, radiating near field distance (Fresnel region) and the far field distance. 1kOhm, 1% tolerance: Brown Black Black Brown Brown. This tool will also compute the resistance of the microstrip, the voltage drop, and the power. New for February 2011! We have some content on the equivalent electrical length of mitered bends in microstrip, thanks to Kevin, who introduced us to the "sharkbite mitre"!. One of the features of this type of microstrip is the coupling between lines. Shows how to use QucsTransline, the transmission line calculator of QucsStudio. I is the current intensity, in Ampere. A microstrip is created by etching a trace on a printed circuit board and is mostly used in microwave applications. The characteristic impedance of a micro strip is a function of the strip line width (ω), thickness (t) and the distance between the line and the ground plane (h). Dielectric Thickness (h) Dielectric Constant (εr) Calculate. As the surface roughness goes from low to high, the conductor losses also increase. 18 mm) and the trace thickness (T)(0. 2301 [ohm] Z0 = 68. Z 0 = Characteristic Impedance of the overall system. Dual Stripline. Assume microstrip line for which propagation occurs with. Such a circuit will deliver an exact cutoff frequency of. That means on ten mil (254 micron) alumina, the width for fifty ohm microstrip will be about 9. This calculator is designed to calculate the characteristic impedance of an edge coupled stripline. James, Experimental Characterization of Microstrip Bends and Their Frequency Dependent Behavior, 1973 IEEE Conference Digest, October 1973, pp. The formulas developed in Section 4. • microstrip has lower loss than GCPW • In general and at millimeter-wave frequencies: • microstrip has more radiation loss than GCPW • microstrip has more issues with mode suppression • microstrip is more dispersive and can limit bandwidth 9 Microwave PCB Structure Considerations: Microstrip vs. subtracted from each measurement. page accessible in the public. Figure 5. Model Setup. Usage example. Impedance calculationA 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. This calculator provides accurate microstrip transmission line analysis and synthesis. Microstrip is a single trace on the top layer, with no ground close to it on the same layer. The required values are trace thickness, substrate heights, trace width, and subtrate dielectric in the calculator above and press the "calculate" button. For example: substrate thickness h=1mm, er=4. As a reminder, Zl = 10 Ω and Zh = 100 Ω, which means the low impedance line width is 24. It was invented because of the undesirable effects on coaxial cable when signals in the microwave range propagate through it. 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 shown in Figure (PageIndex{1})(a). It renders fairly accurate results suitable for use in circuit board manufacturing and engineering analysis. Active VB Script calculator for microstrip transmission line based on a formula by Brian C Wadell, giving characteristic impedance and effective dielectric constant, with equations used. Microstrip and CPW Power Divider Design. The patch antenna, microstrip transmission line and ground plane are made of high conductivity metal. Edge-Coupled Microstrip. As a rough estimation, it can range from 100 ps/inch to 200 ps/inch. This tool is designed to calculate the resistance of a microstrip trace with a copper conductor. This arrangement for the feeding a. 5. These include dielectric thickness (h), target impedance (Zo), and relative dielectric constant (εr). This calculator is designed to calculate the inductance of a microstrip given its dimensions (width, length and the distance of the strip from the ground plane). As the name suggests, the length of this transmission line if fixed at a quarter of the wavelength (λ/4). e. Line Width (W) in mils. Microstrip PCB Impedance in an electric circuit causes an electromotive force to be generated by a change in the current flowing. Note that if the trace is longer than its critical length, it should be treated as a transmission line with a controlled impedance. Microstrip. Hammerstad and others provide well-accepted formulas for calculating the effective permittivity and characteristic impedance of microstrip lines [1–3]. Access a free microstrip impedance calculator; View a list of all of our free online calculators; Calculator Inputs. android-app stripline transmission-line microstrip tx-line cpw coaxial Updated Dec 13, 2022; Java. In all cases, the current is assumed to flow in the outer surface of the. It is not obvious that they had to use 50 Ohm microstrip, but it may have been convenient to do so because that would minimize back reflection where their coax line feeds the the test patch and maximize the signals seen on the samples. Following equation or formula is used for Microstrip Mitred Bend Calculator. The relation between the R, Zo, and amount of power division is given by the following formula. 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. tools impedance-calculator. Equation 11. For microstrip configuration, you have one reference plane below and air on the top, and therefore, Ereff is the effective dielectric constant between air and the dielectric material. (3) Microstrip traveling wave antennaThe microstrip line is a planar transmission line that is used prominently in RF and microwave circuits. The microstrip line will be designed on a substrate with a dielectric constant of 10. 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. Figure 5. Line Thickness (T) in mils. LeeClick here to learn about the Tsai balun, created from a pair of Lange couplers (new for November 2021). Noise Conversion Calculator. 50Ω. Se requieren los parámetros del sustrato: constante dieléctrica (εr), altura dieléctrica (h) y la frecuencia de interés. Most claim to use some or all of these formulas these formulas, but I have discovered ones, for instance, that appear to mistakenly substitute 0. This parameter is used for the loss calculations. Sorted by: 1. Our results are optimised for gain, but others may be optimised for bandwidth. 5 mils (241 microns). 1: 300 Ω 300 Ω twin-lead. A Clemson ECE635 Project by Adam Schreiber and Jason Byers. when i insert the microstrip in patch. Relative Dielectric Constant ( εr ): Track Width: mm. Activity points. Users need only specify the material. 7E-6 [Ω · cm] L is the trace length [cm] T is the trace thickness [cm] W is the trace width. good resolution compared with ADS etc EM simulator - GitHub - yangli0534/microstrip_calc: microstrip line analysis and synthesis,. Ground plane is assumed to be perfectly conducting and of infinite extent. For more information see About our. 23. By determining its trace resistance, the contribution of a microstrip to the overall circuit resistance can be evaluated. Visit to learn more about our other electrical engineering tools. 39 for the effective dielectric constant. Calculates the width of a Microstrip Transmission Line. The definiti ons of the waves a1 and b 1 are ( ) ( ) inc 01 1 00 0 refl 1 1 0 0 incident voltage wave port1 2 reflected voltage wave port1 UU a ZZ Z U b ZZ = == = = (1. (1) When the characteristic impedance (Zo) of the line width (w) is calculated. We apply equations from Equation (11) to Equation (21) [88] to construct a rectangular microstrip patch antenna with. Wire over Ground Calculator. 4 GHz operation on a substrate with 2. Use this online tool to calculate the height/width ratio, impedance and relative dielectric constant of a microstrip transmission line for any given characteristic impedance and electrical length. 06/11/2010: Apple Claims Iphone 4 Has Novel Antenna Design added. This results in only a portion of the signal passing through and causes un-necessary reflections in the system which degrades performance. The tradeoff you are making is circuit size , because low-impedance microstrip lines are wider than high-impedance lines. Enter the values of trace width (w), trace thickness. Micro strip lines are of many types such as embedded micro strip, inverted micro. Equation Lms =. Reset. The transmission line types and the reference of their mathematical models are listed below: • Microstrip line: – H. Choose from different models of microstrip, such as edge coupled, differential, wire, embedded, or stripline, and adjust the input and output parameters. Atwater, “Simplified Design Equations for Microstrip Line Parameters”, Microwave Journal, pp. H. Quarter Wave Transformer Impedance Calculator. 5 mils (241 microns). 9, h = 0. 24-25. If you want a thinner microstrip, you need to reduce the substrate height using one of the following solutions: Use a thinner 2-layer PCB, for example 0. 6. Microstrip Patch Antenna Calculator Calculate dimensions and edge impedance for desired resonant frequency. Target ZDiff: Enter the target differential impedance. Try This New Tool. 98mil. For this reason, trace width is important in the design of striplines. 4: Microstrip Transmission Lines. y = mx + b y = m x + b. In this tutorial, we learn about synthesizing a microstrip transmission (calculating its length and width) using the line calculator (LineCalc) tool availabl. This is a required field. Synthesize the physical parameters (length and width) for the λ/4 lines with impedances of Z0 and Z0/√2 (Z0 is the characteristic impedance of the microstrip line which is taken as 50 Ω). The substrate parameters (ε r and h) and the frequency of interest are required. Useful converters and calculators. microstrip line analysis and synthesis,. 319e-10 Henries, C1 = 5. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. INPUT DATA. When in doubt, use 1 for copper, . • inverted microstrip line. Overview. From short-lines into the long-line regime, the analysis shows behavior of the load voltage (VL) using lumped and distributed element calculations for a lossless transmission line (where R=G=0). Clemson Vehicular Electronics Laboratory: Transmission Line Impedance Calculator. You can build an RC low-pass filter with a cutoff frequency of 1 kHz using a 3. 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. Microstrip Characteristic Impedance Calculator Using a Formula by Brian C. Width (W) Height (H) Calculate. The impedance matching is a common concept in electronics that helps design a circuit that maximizes the power transfer and/or minimizes signal reflection from the load. The main takeaway for me: To get to around 80 ohms, I should not pull ground on the signal. For an embedded (internal) microstrip, the formulas provided in paragraph 4. These equations are. Web This online microstrip impedance calculator calculates the characteristic impedance of the microstrip Ω WH ratio and effective dielectric constant εe by entering the value of. 09/08/2007: Online VSWR calculator added. 06/08/2009: EM Talk Store added - find discount microwave engineering components and devices. Input w, and click on [ Analyze ] button. It shows that advantages of the proposed diplexer lie in its. If the ratio (L/W) is close to unity, the radiation pattern will be symmetric but may not provide a resonable. The characteristic impedance (Z o) of a microstrip transmission line can be calculated using the active calculator or the formula at the bottom of the page. F. 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. Description. (2) When the line width (w) of the characteristic impedance (Zo) is calculated. A free online environment where users can create, edit, and share electrical schematics, or convert between popular file formats like Eagle, Altium, and OrCAD. Sphere. The skin effect is a phenomenon that increases the effective resistance of the microstrip line and boosts ohmic losses. Such a microstrip is constructed with two traces referenced to the same reference plane with a dielectric material between them. The propagation delay of the microstrip line. This distributed inductance and capacitance is the basis of the classic L-C model for a transmission line and it accounts for the. 06/08/2009: EM Talk Store added - find discount microwave engineering components and devices. Use this calculator to calculate the effective dielectric constant, loss, and effective frequency of a microstrip transmission line based on the substrate parameters,. Home; Site Map; Microstrip line calculator. If the dielectric constant of the material is not known, you can choose to put in the velocity of. VSWR Calculator Calculate voltage standing wave ratio (VSWR) and return loss for mismatched circuit. 1: Microstrip transmission line structure and design parameters. P B = Power output of Port 3. Modified. ε R. Consider the microstrip antenna shown in Figure 1, fed by a microstrip transmission line. Introduction. Impedance calculation. Calculate the impedance of a microstrip transmission line with a PCB using this online tool. Click here to go to our page on stripline. Overview. 0 GHz; the width of the microstrip is designed for 50 Ω and the length for a 180 degree phase delay. These include dielectric thickness (h), target impedance (Zo), and relative dielectric constant (εr). Microstrip Transmission Line Models. Stripline Crosstalk Calculator. Figure 10 shows about a 3. The substrate parameters (ε r and h) are required. Our RF calculators and converters will provide the figures you need for your radio frequency engineering needs. TransLine. 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. Height of substrate input2. Description. Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. 1< W/H < 3. Latest News 04/20/2011: Noise Figure calculator added. This 26 mil clearance between copper pour and the 13 mil trace is sufficient to ensure 50 Ohm impedance. Regardless of the attribution, there are a few parameters that are put into the calculator:Coupled Microstrip Analysis/Synthesis Calculator. & C. 2): fHigher - Microstrip = c/(4h εr − 1− −−−−√) = 10. 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. Compared to waveguides, microstrip is generally has a lower power handling capacity, and higher losses due to the fact that it is not enclosed. By adding the formulas of the dielectric and copper, a similarly simple formula of total attenuation is obtained. 4. Wire Self Inductance Model. From the papers, it is found that the gap can be. Backwards crosstalk creates a pulse width that is twice that of the propagation time of the pulse traveling the coupling distance. those with complex curves and shapes, in a. Microstrip patch antenna input impedance in the fundamental mode (i, j, k) = (1, 0, 0). Description. Also (20:Omega) line is about six times wider than a (50:Omega) line and so takes up a lot of room and there is a good chance that it could be close to other microstrip lines or perhaps the wall of an enclosure. everything RF has created a series of RF calculators to help engineers and students with common calculations that they need to conduct frequently. The first Microstrip developments were done shortly after the appearance of Barrett’s article, in 1952 by D. Therefore doubling the thickness cuts the metal loss in half, but does nothing to loss tangent loss. The calculator shown below uses Wadell’s equations for differential impedance, which can be found in the seminal textbook Transmission Line Design Handbook. Single Ended Impedance Ω. The new rfTlineLib contains wideband-accurate transmission line models in multi-conductor microstrip and stripline configurations. Input w, and click on [ Analyze ] button. However, if the parasitics differ much from 0. Abstract: Since the second edition of this book was published in 1996, planar transmission line technology has progressed considerably due to developments in ultrawideband (UWB) communications, imaging, and RFID applications. The propagation delay of the microstrip line can also be calculated, as per Eq. 1 dB loss through port 2 at the design frequency, whereas there is about a 4 dB loss through port 3. These formulas provide the conversion. Microstrip lines will experience more ohmic loss with reduced conductivity. Input Zo, and click on [ Synthesis ] button. 1 Answer. In this case, each coordinate in the vector starts at the origin and lies along the specified points on the x-, y-, and z-axes. Refer article >> on design of microstrip patch antenna used in the mobile phone. For this calculation the diameter and length units are in cm. Microstrip is a type of electrical transmission line which can be fabricated with any technology where a conductor is separated from a ground plane by a dielectric layer known as "substrate". with electrodes very close to the microstrip. 1 For Microstrip Fed Patch Antenna The Transmission Line model to represent the microstrip fed rectangular patch4–6 as shown in Figure 7 which con-sists of a parallel-plate transmission line connected with two radiating slots (apertures), each of width W and height h, separated by a transmission line of length L. The characteristic impedance (Z o) of a microstrip transmission line can be calculated using the active calculator or the formula at the bottom of the page. The use of a standardized impedance makes RF design much more practical and efficient. First the model of the microstrip patch antenna has to be drawn in HFSS. Differential Impedance Calculator. Simons, "Coplanar Waveguide Circuits, Components, and Systems", Wiley. 877 H/m. I've seen many links as well in for microstrip. In this PCB calculator, microstrip line of capacitance per unit length is expressed in F/m. 5 MHz, f2 = 1060. on a thermal modeling study like Johannes’s so that I may get all the necessary information to create a better calculator and/or an online thermal modeling tool that takes into account board stack-up. Figure 3. S-Parameter Analysis and Plotting; Active Circuit Bias Design; Cascade Noise and IP3 AnalysisConsider a typical 50 Ohm microstrip on an 8-layer board (width 17 mils with Dk = 4. 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 test method used is to compare the results. A power divider is a three-port microwave device that is used for power division or power combining. Identify best matched Rogers' bonding material by sorting according to design attributes. . 42e-7 Henries , L2 = 1. This figure shows the cross sections of the four types of microstrip transmission lines you can create using the txlineMircostrip object. Microstrip Calculator computes a microstrip's Effective Dielectric Constant and Characteristic Impedance. highpass(1) When the characteristic impedance (Zo) of the line width (w) is calculated. *Comparisons show minimal differences to ADS linecalc and Polar Instruments Quicksolver industry standard tools. Half-wave and quarter-wave microstrip lines are used to design lumped elements. Effective Dielectric Constant ( εeff ):Characteristic impedance is purely a function of the capacitance and inductance distributed along the line’s length and would exist even if the dielectric were perfect (infinite parallel resistance) and the wires. 3 kΩ × 47 nF) = 1. The edge couple differential microstrip transmission line is a common technique for routing differential traces. Result. For example: Yellow Violet Red Gold: 4 7 x100 ±5% = 4700 Ohm, 5% tolerance. 1 7. 3: Normalized characteristic impedance and normalized effective permittivity of a microstrip line as a function of u = w / h. 1 microstrip line. microstrip (Name,Value) sets properties using one or more name-value pairs. This calculator computes the trace width of a microstrip given the following information: maximum current, trace thickness, temperature rise, ambient temperature, and length. 05/25/2007: Printed Dipole Antenna using. Design a transmission line segment that matches 300 Ω to 50 Ω at 10 GHz using a quarter-wave match. Thanks. Matlab/Freemat file 1. Microstrip Lines and Slotlines, Third Edition. (© CC BY SA 3. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. When in doubt, use 1 for copper, . The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. 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. Note : It is quite possible, that other calculators deliver slightly different results. Output. 1 : microstrip line . 6mm at 10GHz. So, the dielectric at my 5-6GHz frequency range is 3. 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. Access Rogers' calculators, literature, technical papers and request samples on your smart phone or tablet through the ROG mobile app. Dear Prof. 9, 30 and 20 mm, respectively. The propagation delay of the microstrip line can also be calculated, as per Eq. Advanced Search. The capacitance calculated using this tool is the capacitance between a flat conductor and the ground plane over the conductor length. Operating frequency, f in GHz 10 Dielectric constant, reff εFree Space Path Loss Calculator. Characteristic Impedance (Ohms): This calculator tool includes everything needed to calculate the lossless impedance of a stripline. This will help you later to choose the best laminate materials according to impedance and trace thickness. The height (h) is the combination of both substrate thickness as well as air. >2. Microstrip inductance calculator. 109-115, November 1989. The transition structure matches the input impedance using a. 6 GHz f Higher - Microstrip = c / ( 4 h ε r − 1) = 10. For example, microstrip = microstripLine (Length=0. 109-115, November 1989. The transmission line types and the reference of their mathematical models are listed below: M. These columns are headed Input, General, Scalar, Vector, and Output. This calculator assumes the distance between the two reference planes to be an equal distance. 1. This form of microstrip is composed of two traces. 37mm for a 50 ohm. h = Dielectric Thickness. Max Current calculation. A microstrip is a flat conductor separated by an insulating dielectric from a large conducting ground plane and is mostly manufactured from a printed circuit board. Crosstalk occurs when a signal "jumps" from one trace to another, a phenomenon that is unintentional and often unwanted. H (Dielectric thickness) :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. 0 (modified)) A microstrip line is single-ended 1 in the sense that the conductor geometry is asymmetric and the one conductor – namely, the ground plane – also normally serves as ground for the source and load. In general, we have a. Track Thickness: mm. The free space path loss is the loss in signal strength of a signal as it travels through free space. 5. l= 4. With t = 35 um (typical for copper with plating on a pcb), Z odd drops to 44 ohms, according to LineCalc. Coaxial Cable Impedance Calculator. A usable directional. MICROSTRIP WIDTH CALCULATOR. Applied Electromagnetics - Homework 2 Solns microstrip line calculator em: talk microstrip line calculator agilent series scope getHigh frequency electronics toolbox for Microwave engineers, RF professionals, EMC technicians, radio-amateur,students, astronomer…configurations that can be used to feed microstrip antennas. For Seeed you can choose from 0,6 to 3mm. This form of microstrip is composed of two traces. THESE FORMULAS ARE APPROXIMATIONS! They should not be used when a high degree of accuracy is required. 7mil. A microstrip line is shown in Figure (PageIndex{7})(a). , Z0 = 50 Ω) is used and very often G Z= ZL = Z0. 1: Impedance-matching using a quarter-wavelength transmission line. i am talking about the small gap between the patch and microstrip. Wavelength Calculator. microstrip returns a microstrip transmission line object whose properties are set to their default values. The physical characteristics of the microstrip transmission line include the conductor width (w), the. 0 GHz; the width of the microstrip is designed for 50 Ω and the length for a 180 degree phase delay. Example of Microstrip Filter Calculator of bandpass type: INPUTS : f1 = 1024. 1,2Department of Electronics & Communication, Geentajali Institute of Technical Studies, Udaipur, Rajasthan, India Abstract This paper provides details on how to investigate a newA microstrip is a type of transmission line that consists of a conductor fabricated on dielectric substrate with a grounded plane. Re: Microstrip feed line. A basic coupled line filter, using high quality material, can achieve the desired specification. 9 um이며, 이 조건을 그대로 EM 해석해보면 아래와 같이 51옴정도로 약간 오차가 발생한다. This calculator provides accurate microstrip transmission line analysis and synthesis. 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. This line consists of a metal-backed substrate of relative permittivity (varepsilon_{r}) on top of which is a metal strip. You may enter custom values or choose from a list of commonly. 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. 0300 meters. The default units for all given values, except the subtrate dielectric, is in millimetres. Include both the pcb dielectric thickness as well as the wire insulation in the height calculation. Include both the pcb dielectric thickness as well as the wire insulation in the height calculation. Geometriy is not that critical. The patchMicrostrip object is a microstrip patch antenna. Microstrip Max Current Calculator. D. A coupled line RF filter was designed and working prototypes of the design performed well. If the ratio (L/W) is close to unity, the radiation pattern will be symmetric but may not provide a resonable. Formula for Differential Microstrip Impedance Calculator (Using Zo) Where, Z d = Differential Impedance. It consists of rectangular substrate and the metal trace layer as shown in Fig. Overview. Figure 10 shows about a 3. Press. A calculation result is indicated. W. The width of the copper trace, the length of the open-ended stub and the length of the feeding line are 1. Unequal-split Power Divider Calculator. Home; Services. $egingroup$ So basically your answer shows that the JLCPCB impedance calculator results are generally in the same ballpark as the proven field simulators. Caculation of RLGC Parameters of TEM Transmission Lines 2. PathWave Advanced Design System (ADS) Theory. Added calculation for Electrical Length as Air Line equivalent; Added calculation for Delay time ; Known Issues: Norton (Symantec) false positive. 7 × 39. Following Phase shift formula is used by this phase angle calculator. 09/08/2007: Online VSWR calculator added. Click here to go to our page on quadrature couplers. 1< W/H < 3. Embedded Microstrip.