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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102 views
Simulation software to terminate planar waveguides by geometry and material choice?
There are a lot of electromagnetics software modeling suites out there (HFSS, CST Microwave, Sonnet some I've heard of).
I want to terminate a coplanar GS or GSG waveguide with 50 ohm. I know that ...
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Impedance calculators differ pretty much?
As you can see here to calculators I found show huge difference or didn't I set it up correctly? I didn't found hints on possible validity limits. Can someone say if one of those given out results ...
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269 views
How to terminate a coplanar waveguide with 50 ohm load?
So I want to structure a coplanar waveguide by lithography, VNA - coaxial - picoprobe - coplanar waveguide transition to measure impedance of the waveguide. As signal and ground lines are on one ...
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143 views
Huge variation of impedance calculators with same parameters?
There are many free (e.g. AppCad from Agilent) microstrip impedance calculators on the web. I've tested now several, because the first two did show a huge difference in the calculated impedance for a ...
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96 views
What is a good tolerance for impedance matching or how to calculate losses?
If you build a microstrip on a silcon wafer, connected by picoprobes via SMA connector and cables to a VNA, what is actually a good match of the impedances of the cables and the waveguide. Is there a ...
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52 views
Point of thin SiO2 layer for surface microstrip?
Reading some scientific journals I saw that research groups often use a silicon wafer with appropriate dielectric constant/relative permittivity and then build a microstrip (coplanar SGS or edge ...
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204 views
Matching RF traces
The datasheet for this part states the input and output are internally matched to 50 ohms.
However what exactly does this mean? For example the output, would I still need a 50 ohm microstrip to ...
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398 views
Design a 1 GHz lowpass filter
I want to design a 1 GHz low-pass filter. I have tried to find a COTS lowpass filter at such high frequencies but I can't find one.
Hence, I have decided to design one using microstrip lines. So, ...
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667 views
How to calculate signal propagation speed through vias?
There is a need to have a group of signals arrive simultaneously to their respective destinations, given that they start their journey at the same time.
However, due to physical constraints it is not ...
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196 views
Microstrip over power plane
I am designing a 4-layer PCB with 16 channels of LVDS (differential signalling, 480MHz). My layer stackup is Signal-GND-Power-Signal. A microstrip design for the LVDS channels is usually traces over a ...
