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RF envelope generator

  • US 4,864,258 A
  • Filed: 05/02/1988
  • Issued: 09/05/1989
  • Est. Priority Date: 05/02/1988
  • Status: Expired due to Fees
First Claim
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1. A pulse shaping device comprising:

  • a main waveguide section with a predetermined characteristic impedance having an input and an output;

    means for coupling a microwave signal source to said input of said main waveguide section, said microwave signal source generating an input rf pulse having a predetermined magnitude and width in which the rf pulse carrier wavelength is lambda;

    a branch waveguide section with a characteristic impedance equal to one half the characteristic impedance of said main waveguide section having an end connected in shunt to said main waveguide section and a shorted end, said branch waveguide section forming a junction with said main waveguide section for dividing said input rf pulse into a first divided rf pulse which is transmitted towards said output of said main waveguide section and a second divided rf pulse which is transmitted towards the shorted end of said branch waveguide section; and

    means for controlling the length of said branch waveguide section by adjustably positioning the shorted end of said branch waveguide section, the length of said branch waveguide being adjusted such that the carrier wavelength lambda within said second divided rf pulse is shifted a multiple of 180 degrees when said second divided rf pulse is reflected at the shorted end of said branch waveguide section so that the trailing portion of said first divided rf pulse is canceled before said first divided rf pulse is transmitted to said output of said main waveguide, whereby the width of said input rf pulse is shortened.

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