Communications: radio wave antennas – Antennas – Wave guide type
Patent
1983-09-12
1984-11-13
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
333 21R, H01Q 1302
Patent
active
044828993
ABSTRACT:
The present invention relates to hybrid mode feeds which are capable of handling very wide bandwidths. In the present feed arrangements, a dominant TE.sub.11 mode is converted to the HE.sub.11 hybrid mode which is then launched. The TE.sub.11 to HE.sub.11 mode conversion is achieved by inserting a circular dielectric rod (12) into a flared end (11) of a smooth-walled cylindrical feedhorn until a small cylindrical section of the dielectric rod engages with the inner wall (15) of the unflared portion of the feedhorn. In one feed arrangement, the other end of the dielectric rod is similarly inserted into a flared end (21) of a corrugated cylindrical feedhorn section (22) until a short longitudinal section of the cylindrical portion of the rod is concentric with the corrugations of an unflared section of the feedhorn to provide a transition for the HE.sub.11 mode into the corrugated waveguide for subsequent launch.
REFERENCES:
patent: 2801413 (1957-07-01), Beck
patent: 3605101 (1971-09-01), Kolettis et al.
patent: 3618106 (1971-11-01), Bryant
patent: 3858214 (1974-12-01), Jones
patent: 4021814 (1977-05-01), Kerr et al.
patent: 4040061 (1977-08-01), Roberts et al.
patent: 4231042 (1980-10-01), Turrin
patent: 4246584 (1981-01-01), Noerpel
Dragone: Reflection, Transmission . . . in a Corrugated Feed, BSTJ, vol. 56, No. 6, Jul.-Aug., 1977, pp. 835-867.
Dragone: Characteristics of a . . . Corrugated Feed, BSTJ, vol. 56, No. 6, Jul.-Aug. 1977, pp. 869-888.
Carpenter: A dual-Band Corrugated Feed Horn, IEEE, Ap-S Int. Symp., vol. I, Quebec, Canada, 1980, pp. 213-216.
AT&T Bell Laboratories
Lieberman Eli
Pfeifle Erwin W.
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