GNSS DC blocking capacitor

#1

Hello,

When we use a GNSS active antenna a DC blocking capacitor is mandatory to avoid damage at the input of the receiver.

In the document 2174230-1 (WP Serises GNSS Antenna System Requirements) a capacitor of about 100pf shall be used, but on mangOH green a capacitor of 15pf (typical value) is used. So I have looked the characteristic of the capacitance at around 1600MHz, and this is 35pf.

For a custom design, what is the recommended value to use ?

Best Regard’s,