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Author Topic: RF passive components?  (Read 1042 times)
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ravenfeather
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« on: December 19, 2008, 05:33:29 17:33 »

Hi Smiley
I want to know what kind of capacitors and resistors ( the material) are used in high frequency applications like ZigBee or in the 900Mhz band?
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mylogin
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« Reply #1 on: December 20, 2008, 06:13:38 06:13 »

900MHz to 2.4GHz you can use the regular chip resistor, capacitor, 0804, 0r 0603 size. 
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ravenfeather
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« Reply #2 on: December 20, 2008, 10:36:54 10:36 »

Thank you for the reply.And what you think is easier to implement ZigBee ( the chip is impossible to solder fot me QFN Smiley) or Rf at 900 Mhz ( more passive components around)?I'm not good with controllers either, but people are alwas impatient Smiley
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Kwaigo
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« Reply #3 on: December 21, 2008, 12:14:15 12:14 »

Some types of chip resistors (even 0603 and 0402) have thick film layer, so their resistance at high RF may be differ because skin effect. 0805 chips (capacitors) too large for 2.4GHz. Use 0603 or smaller.
« Last Edit: December 21, 2008, 12:22:28 12:22 by Kwaigo » Logged
mylogin
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« Reply #4 on: December 22, 2008, 05:51:18 17:51 »

the important thing is keep the distance short (such as bypass capacitors) and the PCB trace impedance, try to match the size of components with the PCB trace width,  do not use too small component with wide PCB trace, it will create discontinues.     the thin film resistor is expensive, and for 10% tolerance it is not necessary.
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strabush
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« Reply #5 on: December 27, 2008, 10:14:43 10:14 »

For rf circuits use only NPO type capacitor, they are stable and linear.
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