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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18 views

How to determine patch antenna slit/truncation size for RHCP?

I am designing a patch antenna for a project. It is running at 2.45GHz. I am looking into both rectangular and triangular designs. I need to have a single coaxial feed point. I found all the formulas ...
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24 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 ...
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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 ...
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29 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 ...
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27 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 ...
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26 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.
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42 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.
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171 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 ...
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1answer
74 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 ...
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23 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.
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25 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.
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1answer
82 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 ...
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44 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 ...
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1answer
41 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 ...
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2answers
50 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 ...
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25 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 ...
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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 ...
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1answer
18 views

How do I EM-Extract a subcircuit and define a different em/drawing-layer than the original circuit in AWR?

I have a 4-layer project in AWR/MWOffice and have built a parameterized microstrip inductor schematic (named "spiral") with a "Line Type" of layer1 that I wish to reuse on another ...
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21 views

How do you create an Octagonal Microstrip Inductor without a bridge/underpass in NI AWR Microwave Office?

Microwave office has a built-in element like "MOCTIND", but it has a bridge from the center and I would like to construct my own without the bridge that comes with the model. (They do have ...
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3k views

What is Negative Inductance?

I am experimenting with a stripline square spiral inductor in Sonnet and the graph is showing both a positive and negative inductance. What does it mean to have a negative inductance? Why does it ...
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1answer
41 views

I have been designing a micro strip patch antenna with inset feed and I have a few HFSS simulation questions

Substrate dielectric: 3.5 Substrate height : 1.5mm Frequency: 2.5GHz I followed a particular video on YouTube to guide me, and used an online calculator for the width and length of patch, inset feed ...
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48 views

Effect of feeder length in microstrip patch antenna

Summary of the question : Why reflection coefficent changes with microstrip feeder line length ? Explanation of the question: I'm working on re-simulating this paper : Microstrip Patch Antenna Array ...
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1answer
33 views

Couplers and dividers as baluns

Can every divider and coupler that provides 3dB amplitude divison and 180 degrees phase difference be used as balun? Rat race coupler and lange coupler provide the two conditions mentioned above. ...
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39 views

Antenna range calculation

I'm trying to build a microstrip antenna for my BLE module to increase its range. I'm more of a hardware Design and firmware guy and the last time I designed an antenna was in college back in 2015. ...
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1answer
82 views

Microstrip blocking capacitor ground cutout — large cutout size

I'm attempting to minimize the \$S_{11}\$ of a \$10\,\text{pF}\$ DC blocking capacitor on a microstrip trace for my signal frequency range, which is \$5.3-5.9\,\text{GHz}\$. My microstrip trace width ...
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1answer
53 views

Microstrip linear taper effectiveness

I'm trying to optimize the behavior of a DC series blocking capacitor at microwave frequencies (my signal range is from \$5.3-5.9\,\text{GHz}\$). By optimize I mean keeping \$S_{11}\$ as low as ...
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1answer
120 views

2.6 GHz microstrip patch antenna with 100 MHz bandwidth

I'm trying to design a microstrip patch antenna @ 2.6 GHz. The result I got is good but the antenna is very selective and I haven't been able to increase the BW. Currently, the BW is 40 MHz and I ...
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2answers
92 views

Non-90deg mitered bends

Is there an approximate equation giving the optimal miter for a non-90degree mitered bend? In particular, I'm trying to determine the correct miter for a 45degree bend. There are a number of resources ...
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21 views

How do I know the size and position of the slots to carve on the microstrip patch antenna?

I have designed a microstrip patch antenna. To make it UWB I use the half ground plane, which makes the bandwidth 66% now. However, I also want to minimize the reflection coefficient S11. The S11 till ...
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38 views

How to increase gain of a microstrip patch antenna

How do I increase the gain of an antenna? I have designed a microstrip rectangular patch antenna. The ground is half-plane. The VSWR is below 2 for the frequency range of 4 to 8 GHz. The gain I am ...
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1answer
925 views

Avoiding microstrip line to become CPWG

I have been designing RF PCBs for a year for an RF front-end system. One of my PCBs has very strict constraints about its size measurements. So, I should design it very densely. The problem with ...
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22 views

Calculate right inset for microstrip antenna to match trasmission line

So, I have designed a 2.4Ghz microstrip antenna. I have chosen a dielectric height of 1.5 mm with a dielectric constant of 4.08 I calculated my W and L of the antenna and simulated it in CST. I have ...
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114 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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74 views

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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1answer
65 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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35 views

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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32 views

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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1answer
57 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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307 views

Deriving microstrip stub equations

Do anyone know how to derive the microstrip stub equations for all four microstrip below ?
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1answer
41 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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185 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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1answer
99 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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493 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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145 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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3answers
233 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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1answer
66 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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1answer
266 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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2answers
919 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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1answer
660 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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1answer
1k 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 ...