Questions tagged [microstrip]

A microstrip is a transmission line fabricated on a printed circuit board (PCB). They are much less expensive than a traditional waveguide although they typically have higher losses and less power handling capacity.

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32 views

Wavelength on microstrip line

I am trying to calculate the wavelength on microstrip transmission lines. From what I have understand I should use the following relationship: \$ l = c/(f*\sqrt(Er))\$ where Er is the dielectric ...
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PCB trace impedance

I have designed a GCPW trace with an impedance of 50 ohms (for a 5GHz application.) The trace is laid on a PCB with the dielectric as FR4 material. I terminated one end of the trace with 50 ohms and ...
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49 views

Low and high impedance of low pass stepped impedance filter

I'm designing a low pass chebyshev filter using stepped impedance. I'm using the book 'Microstrip Filters for RF/Microwave Applications' as a reference. I have difficulty understanding how low and ...
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Charge Distribution on a Microstrip Line

let's consider a microstrip line connected to a voltage source V0 (applied between the strip and GND plane). According to foundation for microwave engineering (collin) book, the surface charge density ...
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Microstrip Voltage Boundary Condition

I was reading some notes about a microstrip line. Here the scheme with the reference system: In this scheme (sorry for the bad quality of the picture) the upper strip is represented as a charge sheet ...
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69 views

Broadband planer Magic-T design verification

There is magic tee topology described in the paper “A Broadband Planer Magic-T using Microstrip-slotline Transitions”. The response of model shown in figure 3 (see page 3) differs from those shown in ...
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53 views

Current induced on a transmisison line

I have a micro-strip transmission line as shown in the figure which is incident by an external EM field. This field will induce some voltage and current on it. I want to measure the induced voltage ...
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69 views

Deriving microstrip stub equations

Do anyone know how to derive the microstrip stub equations for all four microstrip below ?
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35 views

Ultrawide band bandpass filter

Please suggest how to design ultrawide band bandpass filter in ADS (Advance Design Software) using distributed Microstrip transmission lines.
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58 views

open-circuited stub VS stepped-impedance

What is the difference between open-circuited stub and stepped-impedance ? The open-circuited stub microstrip realization method is a modification of the stepped-impedance microstrip realization ...
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70 views

Microstrip High- and Low-Impedance Short-Line Sections

Expression 4.50 can be obtained by equating the ABCD parameters of the two circuits ? How to derive expression 4.50 using the ABCD matrix for transmission line and π-circuit network ? Note: ...
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115 views

Series Stubs and Microstrip Technology

Why are series stubs difficult to realize in microstrip technology? I read this statement in some text about the realization of microstrip filters, in which the solution for this problem is that of ...
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50 views

microstrip low pass filter design issues with sonnet

I am trying to replicate the microstrip low-pass filter in SonnetLite from the book by Jia-Sheng Hong - Microstrip Filters for RF Microwave Applications, 2nd Edition (Wiley Series in Microwave and ...
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58 views

Microstrip propagation mode

I have a trivial question about EM propagation in a microstrip line. Why do the electric and magnetic fields have the following lines? Which are the physical laws (Maxwell etc) for determining them? ...
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36 views

How to convert lumped components to TL segments?

I have the following circuit: which I need to implement in Microstrip. For now in order to get the correct results I was using lumped capacitors. But I will need to use Microstrip stubs when ...
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128 views

Difference between a circuit developed using lumped elements and microstrip elements (transmission line)

As the title implies, what is the difference between lumped elements and microstrip elements? According to my understanding lumped elements are discrete elements but I don't understand what is the ...
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725 views

Difference between Antenna and Filter

In RF front-ends the diagram shows an antenna followed by a band-pass filter. I am also working on a project involving a micro-strip patch antenna followed by a dual-band band-pass microwave filter. ...
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323 views

Designing 60hz antenna to detect electric field

I am working on designing an antenna to detect 60Hz electric field. I came across the microstrip antenna being used to detect the field. Before designing the antenna I wanted to maek sure this is the ...
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647 views

How to convert Inductor to series transmission line?

My objective is to understand the travelling wave amplifiers, but I am stuck on how to realize inductors in transmission lines. But, I am basically stuck on how to convert a series inductor to a ...
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291 views

Microstrip and CPWG transitions on PCB

I've been doing some simple RF boards as part of an internship in a lab, mainly to test particular ICs and prototyping, and mainly using coplanar waveguides. I've now been tasked with designing a ...
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228 views

Vias Size for Microstrip

if my microstrip trace width is about 50 mil, how large should my via drill size be? Should it also be around 50 mil? Thanks!
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194 views

Calculation of Microstrip Width

I am confused by the "substrate height" and "trace thickness" when I am calculating my microstrip width on here . From manufacturer, I got Does the "out layer copper thickness" refer to "trace ...
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80 views

Can I decrease the width of microstrip at the pin?

I am trying to connect a 60 mil microstrip to the pin of IC. However, the width is relatively large to the space between pins on the IC. Can I decrease the width of microstrip where I connect it to ...
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812 views

How to draw microstrip line in EAGLE?

I am trying to connect W3113 antenna to my RFID UHF reader. The datasheet of the reader requires me to use 50 ohm microstrip line. However, I do not find where I can draw microstrip. Is it still the ...
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186 views

Transmission line voltage measurement(visualizing standing wave)

I want to measure voltage across a T-line to visualize standing waves on the line. something like this video min 6:53 and this experiment Measuring Standing Waves on a Microstrip Transmission Line I ...
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Antenna trace 135 degree bending

I designing PCB for SIM7600CE with space constraint.Here, I placing filter matching and the antenna section through 135 degree angle traces (GREEN MARKING).Is it Okay?Can I have any PCB guidelines? ...
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155 views

Narrowing a microstrip's tip

I have designed a 50 Ohm microstrip line. Following is an image of it. This is drawn in Eagle. Two layer PCB. Blue plane is the ground plane. The dimensions are: Width: 1250 micrometers Thickness: 1 ...
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how much power incident from each line of gysel power divider?

Consider we have equal power divider, So when we have 100 watts in port 1, this power split to two 50 watts in port2 and port 3. for calculating how much temperature Rising in each transmission line, ...
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RF PCB Design Basics - RF traces golden surroundings

In the answers to my previous question "RF Design Basics", there are explanations about the purpose of a golden ring around the PCB edge and around some parts (functional blocks) within the PCB. ...
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182 views

Two cascade directional couplers

I have the following question regarding directional couplers. Below is the question. My solution was to multiply the scattering matrices of both couplers as in the following \begin{pmatrix}0&-\...
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294 views

Cascading of S-Matrices using T-parameters messes up S11 and S22?

I wanted understand how cascading works and so I modelled a microstripline of say length 'L' in CST and got its S-params. Then I simulated a line of length 'L/2' and got the results. So, the response ...
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440 views

Sigfox RF module TD1208R: design a 50 ohm microstrip line on a PCB (Proteus ARES)

I'm designing a PCB (I have very little previous experience). Among other components, I am using the microcontroller MSP430G2553 and the RF module Sigfox TD1208R (868 MHz). I have doubts to design the ...
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49 views

VNA reflection and transmission of stripline stub

Testing this stub board. I understand S12 is attenuated at 1.79GHz due L=λ/4. So I calculate relative permitivity: εr = (c / 4Lf)2 = 3.3 But what does (εr) represent in a ...
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669 views

How to tell the polarization (horizontal or vertical) of a microstrip linear array antenna just by inspection

I know that a linear array of microstrip patches can be either horizontal or vertical depending on its orientation. Does the feed (input port of the array) determine the direction of polarization?
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77 views

Design of microstrip tranmission line

this might sound silly but I am a little confused as to how the quadrature coupler relates to the microstrip transmission line.
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389 views

What are the extra microstrip elements on this RF amplifier board for?

I am planning to build an amplifier with the HEMT CGH40010. In its datasheet (http://www.wolfspeed.com/downloads/dl/file/id/317/product/117/cgh40010.pdf), there is a picture of a evaluation kit on ...
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37 views

Does capacitance per unit length change with change in loss tangent of surrounding medium?

I am running an electromagnetic 2D solver (Q2D extractor) for finding RLGC parameters. I have a microstrip as shown below I am varying loss tangent of the surrounding medium, keeping the relative ...
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331 views

Microstrip design

I have a task which is to design a circuit using microstrip transmission lines. this circuit should generate two output signals of equal power, one which is in phase with the input sine signal and the ...
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912 views

Connecting micro-strip line and stub

I am working on impedance matching for one of my projects. After studying different stub matching strategies, I have implemented single and double stub successfully. When I use just a line and a stub (...
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178 views

Grounded Coplanar - Impedence calculation of microstrip - Advance Design System software (ADS)

I want to calculate the impedance of the micro-strip using Advance design system (ADS) software. I cannot locate "GROUNDED CO-PLANAR" or anything like that. I am new to this software. Can anybody help?...
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395 views

DDR3 trace impedance - short traces but high impedance

I'm putting together a small PCB based around a Xilinx Zynq (the CLG225 one), because the DDR3 pads are all in a big block on one side of the device and because I've been designing for a 4 layer PCB, ...
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254 views

How does RF Coax cable impedance + Microstrip impedance mismatch affect power transfer

I have a passive GNSS antenna with a 6" 1.13mm shielded coaxial cable that connects to a u.FL connector. From the u.FL connector I have a 2" microstrip transmission line to the RF input of my GPS ...
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RF Ground Stitching in Proteus Ares 8

I am using Proteus Ares 8 to create a PCB for a simple RF circuit. I have a double sided copper board, filled with groundplane on both sides, with a single 50 Ohm microstripline across the board to ...
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7k views

USB trace impedance calculations, with termination resistors

I'm designing a PCB featuring a Renesas RZ-A1 microcontroller, and want to check that I'm doing my USB D+ and D- traces correctly. This application note from Fairchild, which is one of the top Google ...
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4k views

Impedance calculation results between grounded coplanar waveguide and microstrip

I got the following question regarding the impedance of a grounded coplanar waveguide(gcw) and microstrip as shown in the image attached: If I increase the spacing w in the gcw to large values I am ...
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110 views

AC-coupled RF Microstrip routing over power plane

If I route a 433 MHz AC-coupled RF microstrip trace out of an MMIC such that it's referenced to a Power plane rather than a Ground plane, will that have a significant effect on the impedance of the ...
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399 views

Effect of metal resistivity on the characteristic impedance of microstrip line

We know that the characteristic impedance of a microstrip line is given as follows: In general the metal resistivity is so small that Z0 can be taken as sqrt(L/C). But if the metal resisitivity is ...
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Altium Microstrip routing

I am currently trying to route a micro strip for a GPS and GSM antenna on Altium which got some constraints on spacing with ground poured plane like the one shown just below: This is currently my ...
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297 views

About a 50 ohm stripline: freq range 0 to 18 GHz

I have a shielded box stripline as shown below: ...
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239 views

Termination resistors usage

My doubt pertains to the usage of termination resistors. This is a continuation of the discussion I saw in this link - Termination resistor. I understand that any transmission line can be simulated ...