Communications: radio wave antennas – Antennas – Slot type
Patent
1988-08-08
1989-06-20
Sikes, William L.
Communications: radio wave antennas
Antennas
Slot type
343785, H01Q 1310
Patent
active
048413089
ABSTRACT:
A slotted waveguide antenna assembly includes a slotted waveguide, a dielectric beam shaper and reflectors which are fixed and held by a holder member.
The dielectric beam shaper is formed from a pair of dielectric plate members. The dielectric plate members are so arranged that they are slightly closer at the forward ends than the base ends, thus providing a nonparallel arrangement. The inclination of the dielectric plate members is selected within a range of 0.8.ltoreq.d/D<1 (D: a distance between the dielectric plate members at the base portions, d: a distance between the dielectric plate members at the forward portions).
The dielectric plate members have a thickness which produces a phase difference, between electromagnetic waves reflected by inner surfaces of the respectivie dielectric plate members that are opposite each other. The electromagnetic waves reflected by interfaces at external surfaces of the respective dielectric plate members move towards the space between the dielectric plate members, and substantially cancel each other because of the phase difference.
REFERENCES:
patent: 2730717 (1956-01-01), Katchky et al.
patent: 2996715 (1961-08-01), Rumsey et al.
patent: 3039097 (1962-06-01), Strumwasser et al.
patent: 3146449 (1964-08-01), Serge et al.
patent: 3234558 (1966-02-01), Borgiotti
patent: 3390393 (1968-06-01), Upton
patent: 4488157 (1984-12-01), Terakawa et al.
Akaba Noriyuki
Takahashi Mutsumi
Terakawa Takashige
Johnson Doris J.
Sikes William L.
Tokyo Keiki Co. Ltd.
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