Karl Ferdinand Braun investigated how coupled electrical circuits transfer and build up oscillatory power for wireless telegraphy. His lecture describes coupling several circuits of the same frequency into the transmitter's excitation circuit. Making them start to discharge at nearly the same time was a substantive experimental difficulty; he discusses a timing requirement of order and an arrangement called energy coupling. The example connects circuit geometry and timing with the useful oscillation delivered to an antenna.[ref]
Electrical Oscillations and Wireless Telegraphy by Karl Ferdinand Braun. 1909 lecture, p. 229, Fig. 3 and simultaneous excitation of coupled circuits
A physicist.[ref]
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Portrait of Karl Ferdinand Braun
. Source. Wireless telegraphy connects an oscillating electrical circuit to a distant receiver. Tuning and coupling determine how effectively the circuit transfers a signal.
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Karl Ferdinand Braun (1850–1918) was a German physicist and inventor best known for his pioneering work in the field of telecommunications and electronic technology. He made significant contributions to the development of radio communications and is particularly credited with the invention of the crystal receiver and the development of the cathode-ray tube (CRT), which later became fundamental to television and oscilloscopes.