Antenna Design Calculator
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A whip antenna also known as a monopole
antenna looks capacitive if it is shorter than a quarter wavelength, and
are tuned to resonance with a series inductor. PCB antennas are
often shorter than a quarter wavelength due to board size restrictions and
often fit into this category.
The capacitance is related by a formula and
is a function of the percentage of wavelength. The matching inductor
is chosen such that the antenna resonates at the desired
frequency. When the antenna is perfectly tuned then it looks
like a pure resistance tied to ground. This resistance is known as
the radiation resistance.
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