Questions tagged [impedance-matching]
Impedance matching is a process of making one impedance equal to another another.
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Whats the point of the feedhorn on a dish antenna, why cant the dish just have a matching network attached to the dish directly?
Apologies if any thing i have said is incorrect. But, in the context of antennas, an unmatched feedpoint often leads to reflections, impacting both transmission and reception. It appears that if the ...
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Matching network for two-port with internally matched inputs/outputs
Background
I had a lab in school where we were given an LNA with inputs/outputs matched to 50Ω, that will be connected to a 50Ω system:
The task was to design the input and output matching networks:
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Ultrasound System Design: Navigating Transmission Line Challenges and Impedance Matching
Hello community!
I'm currently working on the design of an ultrasound scanning system, and I'm seeking guidance, particularly in the realm of high frequency PCB design and transmission lines.
My ...
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How do you chain 2-port S-parameters onto a 1-port S-parameter?
With 2-port S-parameters, you can build up a circuit by chaining them together using ABCD or T-parameters, simply multiply the matrices:
We have measured a complex single port S-parameter of an ...
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Voltage Buffer Vs Impedance matching
I am designing an Amplifier circuit for the microphone. For this, I am using a buffer in between two stages for isolation and I am confused between 2 circuits. I know, in voltage buffer circuits, the ...
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How to design 433 MHz RF with SYN470R?
In this document, I see that 50 Ω of the antenna is mentioned, but what makes me wonder is that in the table below, each strange frequency has a separate impedance, Zin.
What is Zin and what does it ...
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Impedance matching on VNA does not match calculation (with detail steps included)
I have a PCB with a pi-matching network, and I want to calculate the component values for the matching network.
I use LiteVNA and a WE-MCA Multilayer Chip Antenna for this project.
Here is the basic ...
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Impedance adaptation for two frequencies
I just received my first custom RF board that use 2.4 GHz and 5 GHz with a diplexer.
Unfortunately, it appears that the used PCB stack-up wasn't really what I expected so my traces are not 50 Ω, but ...
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Matching network for a radio
I’m trying to understand how the matching network functions on the radio side of a transmission line. As an example, here’s an excerpt from the Nordic nRF52840 DK schematics.
As I understand it, when ...
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Connector impedance matching
The importance of termination matching the cable is emphasized all the time. But before the wires reach the termination resistor they usually pass the connector. I've only seen the impedance specified ...
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Does a perfectly matched impedance matching stub instead reflect if the ports are matched?
Let's say I have some 2-port circuit with an impedance of 50ohms and 75ohms for port1 and port 2, respectively.
If I design some open-circuit single-stub impedance matching circuit, which results in ...
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Antenna tuning of 2.4GHz WiFi board
I am new to the RF electronics and tuning of antennas. I am working on a 2.4GHz Wi-Fi board design using an ESP32-S2 chip. The board consists of a 50 ohm single ended impedance trace for the antenna ...
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Can you calibrate your VNA to show matching circuit behavior, without the antenna connected?
We need to make a matching circuit for an antenna, but the antenna feed point is in an inconvenient location.
Is there a way to calibrate the VNA at the feed point such that the VNA will show the ...
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What parts of the trace count for the feedline impedance in antenna design?
I'm trying to incorporate a ceramic chip antenna in a wearable device due to its low footprint and affordability. After reading the datasheet countless times and YouTube tutorials I'm still not 100% ...
