To increase the resonant frequency of a 1/4...

Question 1 / 27070v6BBqunJOH6kyMqbiVlm

Question 1 of 27070v6BBqunJOH6kyMqbiVlm

To increase the resonant frequency of a 1/4 wavelength antenna:

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Question 1 of 27070

To increase the resonant frequency of a 1/4 wavelength antenna:

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🔍 Key Concepts

• 1/4 wavelength antenna resonance and how physical length relates to resonant frequency • How shortening vs lengthening an antenna affects its resonant frequency • Effect of series reactance (capacitor or inductor) on an antenna that is slightly too long or too short

💭 Think About

• If you want the resonant frequency to go up, what must happen to the antenna’s electrical length? Get shorter or longer? • For each option, ask: does this make the antenna behave electrically shorter or electrically longer at the operating frequency? • Think about whether a capacitor or an inductor in series tends to cancel inductive or capacitive reactance of a too-long or too-short antenna.

✅ Before You Answer

• Recall that a higher resonant frequency corresponds to a shorter wavelength and therefore a shorter resonant length for the same fractional antenna (1/4 wave). • Decide which of the listed changes would make the antenna appear electrically shorter at the frequency of interest. • Double-check that you’re focusing on the direction of change (increase vs decrease of frequency), not just on matching reactances.

Question 1 of 27070

To increase the resonant frequency of a 1/4 wavelength antenna:

Add a capacitor in series .

Lower capacitor value.

Cut antenna.

Add an inductor.

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