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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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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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43 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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599 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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176 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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350 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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1answer
100 views

Double Balanced Mixer - Microstrip Design: Realization

I have a question about the realization of a ring mixer with 2 balun elements in microstrip design: The problem I see is that either the microstrip lines or the diodes cross each other. I have found ...
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188 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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160 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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135 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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71 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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2answers
504 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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149 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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126 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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1k views

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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143 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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221 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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359 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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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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513 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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75 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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341 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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34 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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282 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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1answer
754 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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162 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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344 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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212 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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2answers
2k views

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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2answers
5k 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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2answers
3k 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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95 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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302 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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1k views

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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265 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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224 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 ...
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107 views

Inductance calc for Edge Coupled Differential Pair?

Apologies up front if this topic has been addressed. I've searched on StackExchange and am concluding that this structure is uncommon as there is no ground return accompanying the differential pair ...
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1answer
3k views

How to route a trace on PCB with 50 Ohm impedance?

I used some online calculator to calculate parameters of trace so it has 50 Ohm impedance. I use FR-4, so H=1.5mm, T=0.035mm and Er = 4.5. 2-side PCB, one side with signals, the other with GND. I set ...
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1k views

Microstrip through passive components

I am a bit confused with the implementation of a microstrip line to an u.FL connector. In order to maintain a 50Ohm line, the trace width would need to be ~0.1 inches wide, I have a pi matching ...
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321 views

Embedded microstrip antenna

How well known are embedded microstrip antennas in general and are they feasible. I want to pot a 2.4 Ghz antenna for product reliability/water and shock proof reasons, but finding information and ...
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2answers
417 views

Frequency dependent impedance calculation for microstrip

I need a hint. I'm stuck on outer layer impedance calculation for high speed design. Other PCB designers route high speed tracks on inner layers because of not controlled plating thickness on outer ...
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2answers
1k views

PCB microstrip antenna

I have a query regarding PCB microstrip antennas. Most of my antennas have been straightforward with the U.fl being placed close to the RF feed point. Maybe a PI filter is added. But I have seen many ...
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282 views

ANT-MMCX and Microstripe line and UHF RFID module circuit designing

Below, you see the only schematic of a 6 pages-datasheet of an UHF RFID module (working frequency = 840...930 MHz): There are three questions: What is that ANT-MMCX? I search it in Google and I ...
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123 views

Microstrip lenght problem

I'm simulating a single microstrip half-wave resonator (1.8 GHz) in Sonnet and using ADS LineCalc tool for calculating the microstrip length but I'm getting a wrong number. Substrate parameters (...
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3answers
3k views

Can differential USB traces be routed relative to Power (not Ground) planes?

I would like to route my USB 2.0 (12MHz) signal on the bottom layer of a 4-layer PCB. However, the edge-coupled microstrips would then be referenced to the power plane, not the ground plane. The ...
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3answers
257 views

Controlled Impedance Microstrip Frequency

Are you supposed to calculate the characteristic impedance for the frequency you are using or at 1GHz? I see pretty much everything calculated at 1GHz in all examples and papers. For example - for ...
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1answer
668 views

RF Circuit (what does capacitor do?)

I'm trying to work out why a 0.7pF capacitor was chosen. The circuit operates at 12GHz. At 12GHz, the capacitor has an impedance of about \$18\Omega\$. Also at 12GHz, ...
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769 views

Consensus on microstrip trace impedance calculations?

I'm designing a PCB that has a 2.4GHz signal that I'm routing to an SMA jack. I'm trying to figure out the geometry of the necessary microstrip trace. This is the first rf PCB I've worked on. The ...
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2answers
1k views

Minimal distortion in transmission line

In a transmission line, the condition for minimal distortion (caused by the line) are when (R/L = G/C) in the line, right? However, I don't see any reference to that in any application notes or ...