Timeline for Should RF output of (30+j10) Ohms be matched to 50Ohms for antenna matching network?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 10, 2021 at 23:19 | comment | added | niko20 | You want a matching Pi network that is 30-j10 on the input and 50 ohms on the output. Remember, if you see a J, you want to compenstate and "tune out the j". The chip is +j10 which means you need to "cancel that out" with a -j10 to leave behind only the 30 (30 ohms). If the Pi network does this it will match to the mcu pin exactly. The Pi can have a different input and output impedance, that is its job, so you match on input of the Pi with 30-j10 and simply match the out with 50 (no j) | |
| Jan 10, 2021 at 8:33 | comment | added | wdbwdb1 | I was wondering if 50 ohms might be more ideal due to normally being the best compromise between low attenuation and power handling. | |
| Jan 10, 2021 at 8:22 | comment | added | wdbwdb1 | I understand a matching network is required. My question was "Should the matching network be set to 50 Ohms? Or should it be set at (30+j10) Ohms?" Looking into the antenna, should I match to the (30+j10) Ohms point on the smith chart to match the IC, or should I match to the center of the smith chart at 50 Ohms which is normally ideal for transmission lines? What do you mean by "you want 50 ohms out, but like 30-j10 on the input of the Pi network"? | |
| Jan 10, 2021 at 7:30 | history | edited | niko20 | CC BY-SA 4.0 |
deleted 186 characters in body
|
| Jan 10, 2021 at 7:29 | history | undeleted | niko20 | ||
| Jan 10, 2021 at 5:33 | history | deleted | niko20 | via Vote | |
| Jan 10, 2021 at 5:31 | history | edited | niko20 | CC BY-SA 4.0 |
added 104 characters in body
|
| Jan 10, 2021 at 5:26 | history | answered | niko20 | CC BY-SA 4.0 |