I recently encountered a problem when drawing the board and pulling the wires. I was a little confused and didn't understand it very clearly, so I came to teach you about "RF radio frequency signals"

btty038

I recently encountered a problem when drawing the board and pulling the wires. I was a little confused and didn't understand it very clearly, so I came to teach you about "RF radio frequency signals" [Copy link]

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I'll attach two pictures first to help you raise doubts.

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• This is the RF signal routing with regular cut corners.

The frequencies are all in the LS band

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• This is a general arc trace RF signal

The frequencies are all in the LS band

• I just ask
• The two lines in Figure 1 above are equal.
• The arc of the wire below is the same length as the arc of the wire without the arc. The arc of the bend is different. Are the phases consistent?
• Which of the two has a more controllable phase?
• Because it is not the cable that can be tested, this must be tested on the board, so let's solve the doubts in advance.
• Thanks in advance for your advice

qwqwqw2088

The routing of RF circuits should be based on the physical length of the transmission line and the effective dielectric constant. There should be a formula. You can check which book has an introduction.

Or use software to simulate it. If you are not familiar with it, it is inaccurate to estimate it by eye and it may be misleading.

Even software simulation is only a reference

btty038

qwqwqw2088 posted on 2021-11-15 07:32 The routing of the RF circuit should be the physical length of the transmission line and the effective dielectric constant. There should be a formula. You can check which book has an introduction&nbs ...

Yes, the line is calculated based on 50Ω. Let's see if the two lines need to keep the phase consistent. Is there any special requirement?

se7ens

How is the corner cutting done? This is the first time I've seen it.

Does right angle have a big impact on RF?

btty038

se7ens posted on 2021-11-15 10:12 How is the corner cut done? This is the first time I've seen it. Does the right angle have a big impact on RF?

This is very simple. Just draw it, import it, and fill it. If the right-angle trace surface is large, the impedance will be discontinuous.