Communications: radio wave antennas – Antennas – Wave guide type
Patent
1982-01-25
1984-04-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
H01Q 1306
Patent
active
044424370
ABSTRACT:
The present invention relates to a dual frequency band, dual-mode feedhorn comprising three serially connected waveguide sections (20, 22, 24) and a separate discontinuity (21, 23) at each joint between waveguide sections. More particularly, the feedhorn comprises a first waveguide section (20) for supporting the TE.sub.11 mode in both frequency bands. A first discontinuity (21) symmetrically increases the first waveguide size for converting a portion of the TE.sub.11 mode in both frequency bands into the TM.sub.11 mode. The second waveguide section (22) connected to the first discontinuity comprises an aperture size for supporting the TE.sub.11 mode in both frequency bands but only the TM.sub.11 mode of the higher frequency band. A second discontinuity (23) symmetrically increases the size of the second waveguide for converting another portion of the TE.sub.11 mode in both frequency bands into the TM.sub.11 mode. A third waveguide section (24) coupled to the second discontinuity is capable of propagating both modes in both frequency bands with a length to cause the vector sums of each of the remaining TE.sub.11 and TM.sub.11 modes in each frequency band to be in phase at the exit port of the feedhorn.
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Chu Ta-Shing
England Robert W.
Bell Telephone Laboratories Incorporated
Lieberman Eli
Pfeifle Erwin W.
Wimer Michael C.
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