Small wideband passive/active antenna
First Claim
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1. A horn antenna element including a coaxial to free space transition comprising:
- a waveguide having a feed end, a radiating end and a longitudinal axis;
a coaxial connector assembly attached to said waveguide adjacent said feed end;
first ridge transformation section means mounted within said waveguide in the vicinity of said feed end for coacting with said waveguide so as to form a section of single ridge waveguide;
second ridge transformation section means mounted within said waveguide in the vicinity of said radiating end and opposite to said first ridge transformation section means for coacting with said waveguide and with said first ridge transformation section means so as to form a section of dual ridge waveguide;
said first and second ridge transformation section means each extending beyond said radiating end into free space so as to create an impedance therebetween approximating the impedance of free space, said second ridge transformation section extending beyond said radiating end in both longitudinal and transverse directions with respect to said longitudinal axis of said waveguide.
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Abstract
An array of five, ridge waveguide horns provides monopulse operation over awo octave range. A unique coax-to-ridge waveguide input coupler and an extended ridge matching section at the radiating apertures provide the extended frequency range. The horn assembly is lightweight, compact and suitable for array applications. A five horn monopulse primary feed array is exemplified.
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Citations
9 Claims
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1. A horn antenna element including a coaxial to free space transition comprising:
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a waveguide having a feed end, a radiating end and a longitudinal axis; a coaxial connector assembly attached to said waveguide adjacent said feed end; first ridge transformation section means mounted within said waveguide in the vicinity of said feed end for coacting with said waveguide so as to form a section of single ridge waveguide; second ridge transformation section means mounted within said waveguide in the vicinity of said radiating end and opposite to said first ridge transformation section means for coacting with said waveguide and with said first ridge transformation section means so as to form a section of dual ridge waveguide; said first and second ridge transformation section means each extending beyond said radiating end into free space so as to create an impedance therebetween approximating the impedance of free space, said second ridge transformation section extending beyond said radiating end in both longitudinal and transverse directions with respect to said longitudinal axis of said waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification