F4GRX Sébastien@lina @whitequark every conductor near another one is a capacitor even at DC. What matters is the influence of these low value caps of microwave signals. Since Zc=~1/(2pi f C) the impedance of a capacitor reaches low values at very high frequencies, even for very small "parasitic" caps. When you have low impedances, they act as loads on all parts of the circuit, and give non ideal behaviour.
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