Questions tagged [impedance-matching]
Impedance matching is a process of making one impedance equal to another another.
730
questions
1
vote
2
answers
174
views
How to design an RF frontend for an FM receiver
I'm designing a RF receiver for FM Radio. I simulated the circuit in LTspice and got an output as shown below:
This is OK, but I would like the gain to be 24 dB across the range of 88-108 MHz.
The ...
1
vote
1
answer
50
views
Connecting multiple loads in self-balancing parallel [closed]
I have three (or 'n', where n=3 at the moment) large LED panels that I want to run in parallel.
As we know (or should have known before the 'royal we' actually tried it!), just wiring them together in ...
- 125
1
vote
1
answer
43
views
How can I calculate filter parameters between RF switch and antenna?
In the schematics en.MB1389-WL55JC-highband-E02_Schematic,
there's a Pi filter following the RF switch before it links to the SMA connector for the antenna.
Upon calculation, I found that the cutoff ...
- 185
1
vote
1
answer
159
views
Intuitive explanation of shorted stub behaviour
Can someone please give me an intuitive explanation of shorted stub behaviour?
NOTE: This is not a duplicate of Intuitive explanation of open stub behaviour which has been narrowed to focus on open ...
0
votes
2
answers
220
views
Intuitive explanation of open stub behaviour
Can someone please give me an intuitive explanation of open stubs?
I have the length-based mathematical derivation and explanation from my textbook, but I am looking for an intuitive one.
For example,...
1
vote
1
answer
65
views
External circuit to increase the series capacitance of a resonant circuit
I am working with a long-range reader and antenna coil for a low frequency (135 kHz) RFID application (please see the basic representation below.) The reader features some unknown source impedance, as ...
- 21
5
votes
1
answer
555
views
Why can domestic induction stoves heat aluminium tape, but not aluminium pans?
Domestic induction stoves can't be used with thick aluminium or copper pans, but when I try to heat aluminium tape it does get hot.
Can someone explain why this is the case?
- 61
2
votes
2
answers
232
views
75 ohm cable in an otherwise 50 ohm antenna system: Can I impedance match it?
I have an marine radio antenna installation as shown in the diagram. Can I place baluns (or similar devices) at either end of the 75 Ω cable to solve the impedance mismatch problem?
Background
In ...
- 21
1
vote
2
answers
256
views
Half Bridge Impedance Matching
I’m currently building a half bridge induction heater and can’t understand impedance matching for the life of me.
Here’s an example of a basic half bridge induction heater. How and why was 45uH ...
- 405
1
vote
2
answers
112
views
Via process when implementing GCPW in RO4003 + FR-4 multilayer structure
I am currently developing an RF board that receives up to 8GHz. The board consists of a multi-layer structure combining Ro4003C (8mil) and FR-4. The connector I will be using for the RF board is a ...
- 13
0
votes
0
answers
55
views
Signal Generator Output Impedance Matching and Floating Ground
I am attempting to recreate a signal generator circuit based on the XR2206, as seen in this video. The schematic uses op-amps for offset cancellation and output amplitude matching. To avoid the need ...
- 45
0
votes
2
answers
102
views
Antenna tuning and L/C matching
I see there are already a few questions asked wether it is better to physcally tune the antenna for said frequency and impedance or use a matching network. It seems the conscenus is often the physical ...
- 667
0
votes
3
answers
239
views
How best to match and ground antenna?
An example of RF AM modulation:
https://www.ee-diary.com/2021/12/am-modulator-using-bjt-transistor.html
It is clear that the output is on point C4 and the circuit has a RF function, so I need an ...
user321220
0
votes
2
answers
78
views
How to calculate output impedance of switching regulator?
If I consider a buck converter where in 24 volts, L =100 μH, capacitor 47 μF. Then converter will operate at 400 kHz. How do I calculate the output impedance of the converter?
0
votes
1
answer
168
views
LTspice - auto-transformer impedance ratio
Can you please clarify what formula is used by LTspice to calculate the auto-transformer impedance transfer ratio for the equivalent circuits below?
Both circuits resonate on the same frequency. I ...
- 13