What is the electrical effect of a...

Question 1 / 27070W2DINuMschIzEVoYqppc

Question 1 of 27070W2DINuMschIzEVoYqppc

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

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Question 1 of 27070

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

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🔍 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.

Question 1 of 27070

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

It electrically lengthens a physically fixed length antenna.

It electrically shortens a physically fixed length antenna.

It lowers the resonant frequency of a physically fixed length antenna.

It increases the bandwidth of a physically fixed length antenna.

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Question 1 / 27070W2DINuMschIzEVoYqppc

Question 1 of 27070W2DINuMschIzEVoYqppc

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

Back

Question 1 of 27070

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

If the question has a related picture, it will appear here.