Skip to main content

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.

Filter by
Sorted by
Tagged with
4 votes
0 answers
96 views

Microstrip PCB Design

I am designing a microstrip PCB with frequencies ranging from 100MHz to 8GHz. There are no significant issues at lower frequencies, but the signal loss becomes quite high as approaching 8GHz. ...
Artelec's user avatar
  • 71
1 vote
1 answer
47 views

Impedance of different track widths - Should I compute the average width?

Assume that you having one track that goes from 0.11mm in width to 0.09mm in width. I want to compute the impedance, but I need to select the width. What option should I select? The largest width of ...
euraad's user avatar
  • 1,324
0 votes
0 answers
62 views

Capacitance on op-amp input (inverting pin)

I have the following configuration for my amplifier, which is an transimpedance amplifier: I need to connect my transducer to the inverting pin of my amplifier by using a dip switch to be able to ...
Andromeda's user avatar
  • 473
2 votes
1 answer
146 views

How does a planar balun work (ie, microstrip <-> stripline)?

This document shows a planar microstrip/stripline balun to convert the balanced feed line input to feed the (unbalanced) dipole on a microstrip Yagi antenna. Question: How does coupling to a tapered ...
KJ7LNW's user avatar
  • 2,022
0 votes
0 answers
33 views

Monomode microstrip antenna

Given a microstrip antenna with length a and width b, with a>b, I'm asked to calculate which conditions must satisfy a, b and the frequency so it's a monomode microstrip antenna. The thing is, as ...
Ketterle's user avatar
2 votes
1 answer
203 views

Coplanar waveguide with GND Vs. microstrip general rules

I have been fiddling around with GPS antenna trace impedance matching. I have only Saturn PCB SW to make some calculations. I can't quite get it when microstrip starts to behave more like a coplanar ...
JonasJ's user avatar
  • 23
1 vote
0 answers
116 views

Interdigital filter ground connection on PCB

I have used an online designer utility for my 5 GHz to 6 GHz RF output filter, on the schematic it generated it had shown ground attach points, but I am not sure if I designed ground connections and ...
thegamebusterpl's user avatar
1 vote
0 answers
43 views

How specify rectangle size in Sonnet lite

Although not directly an electronics question, there is probably someone who can help me out. I just started to use Sonnet lite to simulate a microstrip filter. There is one aspect, which to me seems ...
Waldorf's user avatar
  • 221
5 votes
3 answers
2k views

Unexpected low characteristic impedance using the JLCPCB impedance calculator

I'm currently designing a PCB that is intended to fan out the 38 pins of a MICTOR connector to every other conductor of an 80-conductor ribbon cable (The PATA type one, that is AWG30 wires with a 0....
Michael Karcher's user avatar
0 votes
0 answers
119 views

How can I attach a PCB patch antenna with microstrip feed to coax cable without soldering

I designed a patch antenna on a 1.5 mm thick substrate for 7 GHz. It has to be connected to a semi rigid coax cable. Due to the application it is meant for, I can not solder a SMA connector or the ...
PixSim's user avatar
  • 1
1 vote
0 answers
68 views

Micro strip antenna radiation pattern

I'm designing a PCB micro strip antenna, 433.92MHz. I'm new to this and wonder, where does the antenna "start" radiating? I am trying to design the perfect length 1/4 wave for 433.92MHz (172....
okwestern's user avatar
1 vote
1 answer
169 views

NEO-M8N Microstrip Line Calculator

I am designing a pcb which has the module ublox NEO-M8N, However I am having trouble calculating trace widths. I am planning to use an FR-4 board. I was using the following calculator to try and ...
RACHID BEN ABDELMALEK's user avatar
0 votes
0 answers
47 views

Coupled line hybrid coupler parameters

I am designing a coupled line hybrid coupler as a part of of term evaluation at my university. So from my conceptual understanding here coupled line hybrid coupler implies a coupled line coupler with ...
Harsh18's user avatar
1 vote
0 answers
35 views

Microstrip structures identification

I'm currently starting with learning how microstrip structures work. Just for clarification: I'm talking about these here: Microstrips In Power dividers and directional couplers, some basic structures ...
Justin Time's user avatar
0 votes
0 answers
54 views

Microstrip on FPC board

Do anyone know, what is the strange track on FPC board on image below? My guess is, it is something like a microstrip track. The image is for a FPC board, that measure cell voltage of batteries.
Rashid's user avatar
  • 89
2 votes
0 answers
409 views

Maximum RF power for microstrip

Microstrip line have couple parameters that we can change. It's track width (W), copper thickness (t) & substrate thickness (h). The question is "How much RF power we can transfer by this ...
Desinus's user avatar
  • 21
1 vote
2 answers
1k views

Lumped Element Equivalent Circuit for Microstrip line

I am breaking my head already for 2 days on this problem I have. I want to represent my microstrip line in lumped components. My microstrip line has the following characterstics: $$ Z_0 = 50 \text{ [$\...
Cooltafel's user avatar
1 vote
1 answer
2k views

Properly grounding an SMA connector (bottom ground plane only)

I’m currently designing my own breakout board for the RFM95W (LoRa module). I’ll be operating at ~900 MHz. The board has two layers. The top layer contains all the signal tracks (no ground pour). The ...
Miles's user avatar
  • 165
2 votes
0 answers
113 views

Spurious resonance in microstrip transmission line

We were trying to study the broadband response of a microstrip line on a 1.5mm thick Rogers AD1000 substrate whose Dk=10.7 and loss tangent=0.0023 at 10 GHz. The trace width is 1.2 mm. The S21 is ...
abir's user avatar
  • 153
0 votes
0 answers
69 views

Name or class of this "square-wave" shaped microstrip antenna

I'm interested in researching/designing a microstrip antenna shaped like this one: But I'm not sure what phrase to type into google. I can see that this is very similar to an inverted-F antenna, but ...
Sittin Hawk's user avatar
0 votes
1 answer
102 views

Homogeneous magnetic field inside aperture of PCB

I need to create a homogeneous magnetic field of a certain strength across a 10mm diameter opening of a PCB by using a current track on said PCB around the opening. The signal sent through the ...
Swoopoo's user avatar
1 vote
2 answers
432 views

How do you combine 3 existing band pass filters to make a triplexer with 50 Ohm ports?

I have designed 3 microstrip band pass filters that each have a good 50 ohm match at the target frequencies (2 m, 70cm and 13cm bands) and I want to combine them into a triplexer to split one signal ...
KJ7NLL's user avatar
  • 13
1 vote
2 answers
548 views

Ground plane for a GSM spring antenna with 4 layer PCB

We are looking to build a 2G GSM based device with a helical spring antenna like this. The work in progress layout is as shown below: We are using a 4 layer PCB with top layer for signal, inner 1 ...
EarthLord's user avatar
  • 597
2 votes
1 answer
415 views

Routing ethernet differential pairs over ground plane

I am routing a flexible PCB which connects a panel-mount ethernet connector (without integrated magnetics) to a rigid PCB which contains the ethernet magnetics. I plan to route the differential pairs ...
Nick's user avatar
  • 21
0 votes
1 answer
394 views

How can I replace lumped capacitor and inductor with microstrip line?

This is a spst switch working on 2.4 GHz. I want to replace the inductor and capacitors with microstrip line. What is the easy way to do that?
sajib sn's user avatar
0 votes
1 answer
96 views

How do you calculate the power limits and heat dissipation of microstrip filters on a PCB?

We are designing a microstrip diplexer with a high-pass and low-pass filter. What are the power-limiting factors of such a design? The low-pass is a T configuration with two spiral inductors and a ...
KJ7LNW's user avatar
  • 2,022
1 vote
1 answer
1k views

Via fence distance to the trace?

We have a board design with four layers that uses coplanar waveguide with ground plane: The trace has via fences. Originally, the design was: W=0.35mm, S=0.2mm, and H approximately 0.2mm (for one of ...
Cal-linux's user avatar
  • 2,143
1 vote
0 answers
58 views

Matched termination of a microstrip using absorber foam

I have open ended microstrips in an RF circuit (operation freq. 18 GHz) and they cause unwanted back reflection into the rest of the circuit. Now, I wonder if it is possible to eliminate / reduce ...
nsnfn's user avatar
  • 13
10 votes
4 answers
1k views

What is wrong with my 50Ω microstrip?

I'm currently working on a 6 layer board that has both an applications processor and a GNSS module (along other things), and I find myself in a certainly puzzling situation. Let me describe: I have a ...
Aleix's user avatar
  • 123
0 votes
1 answer
159 views

2.4/5.8 GHz Microstrip Antenna Design

SE, I am trying to replicate the F-shape microstrip antenna design shown in: https://www.researchgate.net/publication/330747527_Dual-Band_Monopole_Antenna_for_RFID_Applications in Keysight's ADS, I ...
Aaron's user avatar
  • 311
0 votes
2 answers
568 views

Best way to connect coax along a microstrip

I have an open-ended (stripped, if needed) coaxial cable that I would like to use to insert a signal into a microstrip. The circuit (operating at ca. 18 GHz) however, is made in a way where I can't ...
nsnfn's user avatar
  • 13
1 vote
0 answers
55 views

microstrip patch antenna representation as an array of two slots

from the article bellow we can see the microstrip antenna as an array of two radiating slots which are separated by half a wavelength As shown in the photo bellow.these Electric fields cause magnetic ...
ron398's user avatar
  • 157
1 vote
2 answers
896 views

Does an increase in frequency affect a capacitors value?

When looking at an open circuited microstrip line, when the frequency is increased the value of the capacitance is changed. When looking at an ideal capacitor the value does not change with increased ...
Geno C's user avatar
  • 341
0 votes
0 answers
180 views

Single Section Branch Line Coupler at 73 GHz

SE, I am having trouble making sense of my simulation charts for a branch-line coupler tuned to 73.5 GHz. I followed Keysight's tutorial given by the link below. https://www.keysight.com/us/en/assets/...
Aaron's user avatar
  • 311
0 votes
1 answer
151 views

Dual sided uFL connections

I am laying out a dual sided PCB, 1.6mm (62mil) thickness. I'm wondering if I can drop a via on the feedline to a uFL connector and place another uFL on the other side. Will this cause unacceptable ...
Mr_Engineer's user avatar
2 votes
3 answers
792 views

Bad Reflection from SMA Board Connector at 4-8 GHz

recently I have tried to design a simple SMA-to-microstrip connector PCB intended for 4-8 GHz. The connectors used are vertical with surface-mounted centerpin (link). The design idea was to simulate ...
Miomio's user avatar
  • 123
0 votes
0 answers
75 views

Ground plane size of microstrip

I am trying to design an rf mems switch whose conpcept is shown in the image. I am thinking to use microstrip for transmission of signal. Is there any recommendation for minimum width of ground plane ...
Reactionic's user avatar
1 vote
1 answer
288 views

Coupled Line Bandpass Filter

I am trying to design a microstrip bandpass filter in ADS with a center frequency of 2.4GHz and a fractional BW of 10%. My results from the schematic look great: When I move to the layout and EM ...
user267451's user avatar
0 votes
0 answers
56 views

How to find the distance between two arms of a hairpin resonator?

In this picture I want to find the value of W_cap(the distance between two arms of hairpin resonator). I have the length, width, quality factor and coupling co-efficient of the resonator.
sajib sn's user avatar
0 votes
1 answer
64 views

I need help with hairpin filter design. Can anyone help me with the design steps and equations? [closed]

I have the coupled line design. But don't know how to convert it to a hairpin structure.
sajib sn's user avatar
5 votes
2 answers
1k views

Qucs simulation of quarter wave microstrip stub doesn't match ideal calculaton

I'm trying to simulate the resonant frequency and insertion loss of a 3 mm open stub on a 10 mm microstrip transmission line (50 Ω) on a FR-4 PCB (εr = 4.0, height = 0.1 mm). I calculated that the ...
比尔盖子's user avatar
  • 7,218
1 vote
1 answer
2k views

What spacing to use between microstrip trace and ground plane on same layer?

I am designing a 4 layer board (1 - signal, 2 - GND, 3 - power, 4 - signal) and I have some microstrip lines on top and bottom layers. Should I fill the top and bottom layer with ground? What do you ...
Cristian M's user avatar
0 votes
0 answers
117 views

How to implement this design in ADS(Advanced Design System)?

I was trying to implement this design in ADS. I have used coupled lines with all the dimensions but didn't get the expected result. Can anyone instruct any better way.
sajib sn's user avatar
0 votes
0 answers
53 views

How to provide gap between two separate structure or microstrip lines in ADS(Advanced design systems)?

I want to provide gap between two resonators. Here is an image. How do I provide those gap M12 and M23.
sajib sn's user avatar
2 votes
1 answer
468 views

Feasibility of rat-race as RF mixer without active devices

My understanding is that RF mixers generally use some sort of active device (sometimes diodes) to produce output rich in harmonics, and rat-race couplers can be used to get the sum or difference ...
crossroad's user avatar
  • 1,430
2 votes
1 answer
397 views

ADS Wilkinson Power Divider

I finished the schematic for my 2.4GHz microstrip Wilkinson power divider. I am moving to the layout and trying to do the EM simulation, but I cannot figure out how to put a lumped element in the ...
user267451's user avatar
1 vote
1 answer
189 views

Impedance of an embedded microstrip with different sub- and superstrate

I have been trying to find a formula to calculate the impedance of an embedded microstrip where the substrate has a different dielectric constant to the superstrate (so the stack up is conducting ...
jfeis's user avatar
  • 25
1 vote
2 answers
724 views

Microstrip Wilkinson Power Divider

I am trying to design a microstrip Wilkinson power divider in ADS for 2.4GHz. My schematic is shown below: The calculations all check out but I am not getting the best RL at 2.4GHz: If anyone could ...
user267451's user avatar
0 votes
0 answers
112 views

Bias line using Microstrip

I need to bias a transistor amplifier operating between 12-15GHz. I will be using a microstrip bias line to connect DC to the collector as well as the base. I came up with the following simple design ...
hacker804's user avatar
  • 602
6 votes
3 answers
2k views

Why is there a solder mask opening over a microstrip line?

I have always wondered why there is an opening in the solder mask whenever a microstrip line is laid out on a PCB. For reference consider the following board: There is clearly a large opening in the ...
hacker804's user avatar
  • 602