Discussion
Why is a bandwidth increase caused by dielectric loss not worth having?
Answer: C
Bandwidth is inversely proportional to the total quality factor, and lowering that factor by adding loss widens the response while sending the added energy into heat instead of into space. The antenna looks better matched and radiates less. The same trap appears whenever a resistive element is added to flatten a response. Asking where the energy goes, rather than what the match looks like, is the reliable test of whether a bandwidth improvement is genuine.
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