All Questions
Tagged with impedance-matching vna
20
questions
0
votes
0
answers
46
views
S21 calculation
In this post
It mentioned that there's a factor 2 in S21 value.
But I'm still don't understand why there's a 2 in it.
My schematic is shown below.
Shouldn't S21 = Vout/Vgen?
My question is: where is ...
- 141
2
votes
0
answers
46
views
How to create schematic of common mode choke that reflect on Common mode, differential mode and mixed mode? [closed]
I aim to create a schematic that can replicate the results exactly as seen in the measured S4P file. I have conducted the measurement using a VNA and am attempting the schematic simulation in CST. ...
- 101
2
votes
0
answers
49
views
Challenges in Bandwidth in Common mode Choke Modeling
I'm currently working on characterizing a common mode choke (CMC). However, I'm encountering difficulties aligning the bandwidth of my model with the measured results. Specifically, when I attempt to ...
- 101
0
votes
1
answer
183
views
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 ...
- 1
1
vote
1
answer
50
views
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 ...
- 2,190
1
vote
1
answer
91
views
Vector Network Analyser (VNA)
I am trying to achieve impedance matching using load-pull mechanism and I recently found out that on a Smith chart in the VNA, the S21 doesn't make any sense as I have to plot transmission parameters ...
1
vote
0
answers
154
views
"Short" calibration
The following section from ST Micro's AN4974 - 'Antenna Matching' app note is a bit of a mystery.
Is there a VNA / network analyzer guru out there who can tell me what the 4th line there is saying? I ...
- 113
2
votes
0
answers
636
views
Calibrating a VNA
I am using the Siglent SSA3032A-R spectrum analyser which has a Vector Network Analyser (VNA).
Before measuring the impedance of an antenna under test so that I can match this antenna, I have to ...
- 412
4
votes
2
answers
3k
views
Tuning an antenna using a NanoVNA, Smith chart and impedance readings
I am new to antenna design and teaching myself how to optimize antennas using a VNA.
I have created a monopole antenna on a PCB (i.e. a single length of track.) The antenna can be fed via a PI network ...
- 59
3
votes
1
answer
795
views
Match SMA antenna input connector to 50ohm
I'm using an "IOT" radio module designed with a 50 ohm single ended antenna output. The working frequency is about 868 MHz, the maximum transmit power is 14dBm. The module antenna output is ...
- 31
1
vote
0
answers
86
views
Antenna matching circuit - weird behaviour
I have a 2.4GHz device with room for a Pi matching circuit. I cut J5 (to disconnect the MCU - brown line in layout picture), soldered the ground of the coaxial cable in the white region and the ...
- 101
2
votes
1
answer
158
views
Chip antenna too good to be true?
I have the following setup:
Very small PCB - 25mm in diameter that hosts chip antenna;
I feed directly into antenna matching network with about 7.5cm coax via ufl connector;
There are no other ...
- 123
3
votes
1
answer
1k
views
At which point and how to connect VNA on the PCB for antenna tuning?
I am working on a 2.45 GHz(Bluetooth) project. I have used a ceramic chip antenna with 50 Ω impedance for this board.
I've placed a Pi network close to the antenna and also I have used an integrated ...
- 51
0
votes
2
answers
913
views
Measurement of s11 with reduced power on NanoVNA
I am developing a 10.7 MHz IF amplifier for a radio receiver. In order to match the input to the output of the driving mixer stage (330 ohm) I need to measure the input impedance.
I did the ...
- 885
0
votes
2
answers
480
views
Impedance matching with complex impedance source
The method/steps to use a VNA to determine a matching network for a 50 Ohm (or whatever impedance) antenna seem mostly clear to me now. My current knowledge assumes though the transceiver (source) is ...
- 450