🔍 Key Concepts

• Series capacitance and its effect on the electrical length of an antenna • Relationship between capacitance, inductance, and resonant frequency in an LC circuit • How adding a component in series (not parallel) changes overall reactance

💭 Think About

• Think about whether a capacitor in series makes the antenna seem electrically longer or shorter at a given frequency. • Recall the basic resonance formula that links frequency with inductance and capacitance—what happens to resonant frequency when total capacitance is reduced? • Consider whether series capacitors are commonly used to raise or lower the operating (resonant) frequency of an antenna that is physically too long or too short.

✅ Before You Answer

• Write down the LC resonance relationship and see how frequency changes when C gets smaller. • Confirm that a series capacitor reduces the net capacitive effect of the antenna system, rather than increasing it. • Eliminate options that are not a direct increase/decrease effect on frequency (look at what C and D really describe).