Bicone antenna with hemispherical beam for satellite system

Details Bicone antenna with hemispherical beam for satellite system Bicone antenna with hemispherical beam for satellite system

H - Electricity

01

Q

351/28, 351/29

H01Q 13/04 (2006.01)

Patent

CA 2039824

A bicone microwave antenna having an or orthomode tee as an input/output termi- nal, an internal dielectric polarizer, a circular waveguide with eight longitudinal radiat- ing 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 con- verted into a rotating TE11 mode by the internal dielectric polarizer. The radiating slots in combination with the conical reflectors radiate the RF signal as a horizontally polar- ized field in a doughnut-shaped pattern. The meanderline polarizer converts the hori- zontally 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.

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