Fin-line horn antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJohn Reindel
Life of this patent
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Abstract
A fin line circuit card containing a fin line slot feeds a dipole antenna ich extends a quarterwave outside the waveguide and provides an energy beam focal point at or near the open end of the waveguide. The dipole antenna thus maintains a wide and nearly constant beamwidth, low VSWR and a circular symmetric radiation pattern for use in electronic warfare direction finding and surveillance applications.
Claims14
A fin-line horn antenna assembly comprising:
- a waveguide horn having a longitudinal axis and having an open end for radiating and receiving electromagnetic energy;
- a planar, dielectric card positioned within said waveguide, the plane of said card being parallel to said longitudinal axis;
- a layer of conductive material disposed on a surface of said card;
- a fin-line slot for propagating electromagnetic energy, formed in said layer of conductive material;
- a dipole radiator formed on said dielectric card and coupled to said fin-line slot for propagating electromagnetic energy therebetween;
- and
- energy transition means formed on said dielectric card and operably coupled to said fin-line slot for providing coupling of electromagnetic energy from said waveguide to said fin-line slot.
In a combined dipole antenna and waveguide assembly which includes a dipole antenna extending from an open end of a waveguide, the improvement comprising:
- a slotline electromagnetic energy feed positioned within said waveguide and operably connected to said dipole antenna for directly coupling electromagnetic energy from within said waveguide to said dipole antenna.
Dependencies are inferred from the claim text.