A simple workaround for all this was an acoustic coupler, a device that played your modem’s sounds directly into a phone’s receiver without any electrical connection. Modem speeds were slow ...

Abstract: This paper describes the theory of operation of coupled strip line tilt ers and directional couplers, and presents information from which these components may be easily designed. Low-pass, ...

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Persistent Link: https://ieeexplore.ieee.org/servlet/opac?punumber=50 ...