Communications: radio wave antennas – Antennas – Wave guide type
Patent
1991-11-15
1993-06-01
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Wave guide type
333137, H01Q 1300
Patent
active
052164330
ABSTRACT:
A polarimetric antenna (20) comprises a length of circular waveguide (30) having a sidewall (32) with a cylindrical internal surface (34). The sidewall (32) has two longitudinal slots (38) that extend parallel to a longitudinal axis (36) of the waveguide (30) and are symmetrically positioned with respect to the circumference of the circular waveguide (30). A first rectangular waveguide (40) communicates with one of the longitudinal slots (38), and a second rectangular waveguide (42) communicates with the other longitudinal slot (38), but is short circuited by a closure (44) at one end thereof. A transverse closure (46) is positioned over the circular waveguide (30) at one end, the closure (46) having a first and a second transverse slot (48, 50) therein. These slots (48, 50), which are preferably arcuate in form, are positioned symmetrically with respect to a longitudinal axis (36) of the circular waveguide (30). A third rectangular waveguide (52) is in communication with the first transverse slot (48), and a fourth rectangular waveguide (54) is in communication with the second transverse slot (50). The two rectangular waveguides (52, 54) are preferably excited through an E-plane folded magic Tee (58). This antenna (20) is used to radiate sub-microwave, microwave, or millimeter wave energy in applications such as a cassegrain tracking antenna (22).
REFERENCES:
patent: 2682610 (1954-06-01), King
patent: 3395059 (1968-07-01), Butler et al.
patent: 3864683 (1975-02-01), Morz
patent: 4047128 (1977-09-01), Marz
patent: 4420756 (1983-12-01), Hamada et al.
patent: 4801945 (1989-01-01), Luly
patent: 5066959 (1991-11-01), Huder
Eisenhart Robert L.
Holzman Eric L.
Kurtz Louis A.
Robertson Ralston S.
Brown C. D.
Denson-Low W. K.
Heald R. M.
Ho Tan
Hughes Aircraft Company
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