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Somewhat a pity to throw money for an expensive ultra-low capacitance TVS. You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from ...
Answer
#5: Post edited
by
coquelicot
·
2022-02-03T19:49:50Z (about 2 years ago)
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
- So, all what you need is a small, small, choke between C3 and S1, connected to ground via a stupid TVS, or even without TVS at all (since the the DC voltage between C3 and S1 is most probably at ground). Totally inexpensive.
- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
- So, all what you need is a small, small, choke between C3 and S1, connected to ground via a stupid TVS, or even without TVS at all (since the the DC voltage between C3 and S1 is most probably at ground). Totally inexpensive.
- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
- **Note**: many antennas, like the Vivaldi antenna or the self grounded bow tie antenna are made of a single block where the ground part is connected to the feeding part:
- 
- For those antennas, I believe it is pointless to protect the receiver from ESD.
#4: Post edited
by
coquelicot
·
2022-02-03T19:05:15Z (about 2 years ago)
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
So, all what you need is a small, small, choke between C3 and S1, connected to ground via a stupid TVS. Totally inexpensive.- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
- So, all what you need is a small, small, choke between C3 and S1, connected to ground via a stupid TVS, or even without TVS at all (since the the DC voltage between C3 and S1 is most probably at ground). Totally inexpensive.
- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
#3: Post edited
by
coquelicot
·
2022-02-03T17:40:27Z (about 2 years ago)
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
So, all what you need is a small, small, choke between C3 and S3, connected to ground via a stupid TVS. Totally inexpensive.- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
- So, all what you need is a small, small, choke between C3 and S1, connected to ground via a stupid TVS. Totally inexpensive.
- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
#2: Post edited
by
coquelicot
·
2022-02-03T17:39:24Z (about 2 years ago)
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
- So, all what you need is a small, small, choke between C3 and S3, connected to ground via a stupid TVS. Totally inexpensive.
- 
Of course, you choose the inductor value to block 95% (say) of the frequencies above the lower bound of the given frequency range and not more, which means a very small value at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
- Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
- You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
- So, all what you need is a small, small, choke between C3 and S3, connected to ground via a stupid TVS. Totally inexpensive.
- 
- Of course, you choose the inductor value to block 95% (say) of the lowest frequency in the given range and no more, which means a very small inductance at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.
#1: Initial revision
by
coquelicot
·
2022-02-03T17:18:09Z (about 2 years ago)
Somewhat a pity to throw money for an expensive ultra-low capacitance TVS.
You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range.
So, all what you need is a small, small, choke between C3 and S3, connected to ground via a stupid TVS. Totally inexpensive.
Of course, you choose the inductor value to block 95% (say) of the frequencies above the lower bound of the given frequency range and not more, which means a very small value at these frequencies. ESD discharges are much slower (in the MHz range at the worst), and after they have passed the pi filter, they will probably come much likely in the 100KHz range maximum. So, they will discharge to ground via the TVS, and hardly feel the small choke.