Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1990-05-07
1992-07-28
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With polarization filter or converter
343771, 343773, H01Q 1304
Patent
active
051344203
ABSTRACT:
A bicone microwave antenna having an orthomode tee as an input/output terminal, an internal dielectric polarizer, a circular waveguide with eight longitudinal radiating slots, two 30 degree conical reflectors, an external meanderline polarizer, and a partial circular waveguide short. An RF signal from the input/output terminal is converted into a rotating TE.sub.11 mode by the internal dielectric polarizer. The radiating slots in combination with the conical reflectors radiate the RF signal as a horizontally polarized field in a doughnut-shaped pattern. The meanderline polarizer converts the horizontally polarized field into a circularly polarized field. The partial circular waveguide short leaks a predetermined amount of radiation out the end of the waveguide to fill the center hole of the doughnut-shaped radiation pattern, thus producing a hemispherical RF beam having an elevation angle from 110 to -110 degrees. The use of impedance-matching circular rings in the waveguide further enhances the ability of the antenna to operate in three frequency bands.
REFERENCES:
patent: 2650985 (1953-09-01), Rust et al.
patent: 2978702 (1961-04-01), Pakan
Tang, "Dual Frequency Omnidirectional Slot Antenna", The Microwave Journal vol. 9-No. 12, Dec. 1966 pp. 60-61.
Saito et al., "The NHK Kinuta SHF Experimental Station", NHK Laboratories Note, Ser. No. 182, Oct. 1974, pp. 2-7.
Kroupa Gregory D.
Raghavan Krishnan
Rosen Harold A.
Wong Mon N.
Denson-Low Wanda K.
Hughes Aircraft Company
Mitchell Steven M.
Westerlund Robert A.
Wimer Michael C.
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