What effect will adding a capacitor in series with an antenna have on resonant frequency?

What effect will adding a capacitor in series with an antenna have on resonant frequency?

• A. Decrease
• B. Increase
• C. Neutralization
• D. Equalization

Answer: (B)

Adding a capacitor in series with an antenna affects the resonant frequency by increasing it. This phenomenon is based on the principles of antenna impedance and resonance. When a capacitor is introduced into the circuit, it changes the overall capacitive reactance of the system. In a resonant antenna, the resonant frequency is defined by the relationship between inductance and capacitance, often expressed in terms of the resonant frequency formula. By adding a capacitor in series, you effectively decrease the total inductive reactance relative to the reactance of the capacitor. As a result, this adjustment raises the frequency at which resonance occurs. This effect can be understood through the concept of resonance, which occurs when the inductive reactance and capacitive reactance are equal. With the introduction of additional capacitance in series, the balance shifts, necessitating a higher frequency to achieve resonance again as the inductance remains unchanged. Consequently, the resonant frequency is increased as the circuit adjusts to the new capacitive reactance introduced by the capacitor.

Adding a capacitor in series with an antenna affects the resonant frequency by increasing it. This phenomenon is based on the principles of antenna impedance and resonance. When a capacitor is introduced into the circuit, it changes the overall capacitive reactance of the system.

In a resonant antenna, the resonant frequency is defined by the relationship between inductance and capacitance, often expressed in terms of the resonant frequency formula. By adding a capacitor in series, you effectively decrease the total inductive reactance relative to the reactance of the capacitor. As a result, this adjustment raises the frequency at which resonance occurs.

This effect can be understood through the concept of resonance, which occurs when the inductive reactance and capacitive reactance are equal. With the introduction of additional capacitance in series, the balance shifts, necessitating a higher frequency to achieve resonance again as the inductance remains unchanged. Consequently, the resonant frequency is increased as the circuit adjusts to the new capacitive reactance introduced by the capacitor.