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Finline antennas

  • US 4,782,346 A
  • Filed: 03/11/1986
  • Issued: 11/01/1988
  • Est. Priority Date: 03/11/1986
  • Status: Expired due to Fees
First Claim
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1. An antenna, comprising:

  • a truncated hollow conductive waveguide having a longitudinal axis, said waveguide being adapted for propagating electromagnetic energy towards a port formed by the truncation;

    a dielectric plate located partially within said waveguide and having a region located partially without said waveguide at said truncation, and with the plane of said dielectric plate parallel to an electric field component of said electromagnetic energy within said waveguide;

    a first conductive finline portion having a first pair of spaced conductors on one broad side of said dielectric plate defining a first longitudinal slot having a first slot axis parallel with said longitudinal axis, the width of said first longitudinal slot increasing with increasing distance from said port in said region without said waveguide to define a radiating portion having a gain;

    a second conductive finline portion having a second pair of spaced conductors on a second broad side of said dielectric plate defining a second longitudinal slot having a second slot axis parallel with said longitudinal axis, the width of said second slot increasing with increasing distance from said port in said region without said waveguide for improving the performance of said radiating portion;

    wherein at least said first finline is conductively isolated from said conductive waveguide, and further including electromagnetic signal generating means comprising;

    charging means coupled to at least said first finline for charging said first finline to an electric potential;

    controllable switch means coupled to said first finline at a location near said port for discharging said electric potential of said first finline in response to a control signal; and

    control signal generating means coupled to said controllable switch means for operating said controllable switch means at a time when at least said first finline is charged to an electric potential for discharging said first finline for radiating a pulse of electromagnetic energy from said radiating portion.

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