What is the electrical effect of a...

What is the electrical effect of a...

Question 1 of 27070W2DINuMschIzEVoYqppc

What is the electrical effect of a capacitance in series with the antenna?

Question 1 of 27070

Q

What is the electrical effect of a capacitance in series with the antenna?

🔍 Key Concepts

• How a capacitor in series affects the electrical length of an antenna • Relationship between capacitance and reactance (Xc) at a given frequency • How changing electrical length affects resonant frequency of a fixed physical antenna

💭 Think About

• Think about whether a series capacitor adds a leading (capacitive) reactance or a lagging (inductive) reactance to the antenna system. • If an antenna is too long or too short for the operating frequency, is a series capacitor used to correct a long antenna or a short antenna? • Consider whether making an antenna electrically longer or shorter would move its resonant frequency up or down.

✅ Before You Answer

• Recall that capacitive reactance $X_c = \frac{1}{2 \pi f C}$ is negative (leading) in sign compared to inductive reactance. • Decide whether a series capacitor is commonly used to compensate for an antenna that is physically too long or too short for its wavelength. • Check which options refer to electrical length change versus those that refer to frequency or bandwidth, and match that to the primary effect of a series capacitance.