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I have a prototype board for Sigfox and LoRaWAN (915MHz) with spaces to install components for a Pi network on the antenna.

We're using a 0R 0603 SMD resistor in place of the inductor, and no capacitors at the moment. I.e. we have bypassed the Pi network.

I was wondering, is a standard 0603 0R resistor ok for the link or do we need special RF rated resistors even though it's 0R?

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Virtually all thin film 0603 resistors will be fine. Here is a table of model parameters taken from real resistor measurements made by Vishay: -

enter image description here

As you can see, capacitance is tens of femto farads and inductance is easily sub 1 nH. Table taken from here.

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  • \$\begingroup\$ Thanks that’s great info. FYI I was wondering if the resistor could be attenuating our signal. Turns out the u.fl socket was soldered backwards making the RF path open circuit! \$\endgroup\$
    – Michael
    Feb 14, 2018 at 11:19
  • \$\begingroup\$ Nice find!!!!!! \$\endgroup\$
    – Andy aka
    Feb 14, 2018 at 11:28
  • \$\begingroup\$ The study is specifically about thin film resistors. Would thick film resistors give significantly different values? \$\endgroup\$
    – pfabri
    Dec 9, 2020 at 17:55
  • \$\begingroup\$ Why don’t you formalise that into a site question @pfabri \$\endgroup\$
    – Andy aka
    Dec 9, 2020 at 18:02
  • \$\begingroup\$ @Andyaka Didn't think it was worth it. I thought asking this (imho) highly-related question here was a better strategy. \$\endgroup\$
    – pfabri
    Dec 14, 2020 at 14:43

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