Without loading coils, the line response is dominated by the resistance and capacitance of the line with the attenuation gently increasing with frequency.
12.
In order to make the antenna resonant to feed it efficiently a loading coil is required to cancel the antenna's capacitive reactance.
13.
The cut-off phenomena of loading coils, an undesirable side-effect, can be exploited to produce a desirable filter frequency response.
14.
The concept of loading coils was discovered by Oliver Heaviside in studying the problem of slow signalling speed of the first transatlantic telegraph cable in the 1860s.
15.
A common application of loading coils is to improve the flux linkages, without which the number of turns on the coil would need to be increased.
16.
A more engineer friendly rule of thumb is that the approximate requirement for spacing loading coils is ten coils per wavelength of the maximum frequency being transmitted.
17.
The loop antenna was equipped with a tuneable loading coil that changed the effective length of the antenna to allow it to work efficiently at different wavelengths.
18.
To reduce the length of a whip antenna to make it less cumbersome, an inductor ( loading coil ) is often added in series with it.
19.
Campbell's work on loading coils provided the theoretical basis for his subsequent work on filters which proved to be so important for frequency-division multiplexing.
20.
The high capacitance and inductance and low resistance of the antenna-loading coil combination, makes it act electrically like a variometer ) to tune the antenna.
