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.pi.-Loop phase bit apparatus

  • US 4,001,734 A
  • Filed: 10/23/1975
  • Issued: 01/04/1977
  • Est. Priority Date: 10/23/1975
  • Status: Expired due to Term
First Claim
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1. An apparatus for selectively introducing a predetermined phase shift in a signal, said apparatus comprising a signal input terminal and a signal output terminal, a first unidirectionally conducting device connected from said signal input terminal to said signal output terminal;

  • a first segment of transmission line connected from said signal input terminal to a first junction, said first segment of transmission line being greater than one-quarter wavelength and less than one-half wavelength long at the frequency of said signal;

    a second segment of transmission line connected from said output terminal to said first junction, the length of said second segment of transmission line being substantially equal to that of said first segment;

    a second unidirectionally conducting device connected from said first junction to a second junction maintained at a substantially fixed direct-current reference potential; and

    means connected to said first and second segments of transmision line for simultaneously reverse biasing said first and second unidirectionally conducting devices to provide a reference phase shift in said signal or for simultaneously forward biasing said first and second unidirectionally conducting devices thereby to selectively increase said reference phase shift by said predetermined phase shift.

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