| 摘要 |
PURPOSE:To detect a tracking signal only without making large-sized device and without affecting on a communication signal, by providing plural probes having their length toward the axial direction around the internal circumference of a circular taper waveguide forming a feeding path. CONSTITUTION:The probe 2 having about 1/4 wavelength of the operating frequency is provided at four positions at the circumference of a horn antenna axially, at the inside of the taper waveguid 1 of the circular horn antenna for circular polarized wave communication receiving the basic mode TE<0>11 wave and at a diameter being the transmission region to a TM<0>01 wave used for the tracking, and a detection element led externally with a coaxial line is provided at the root of the probes 2. A diameter D of the feeding waveguide is set so that the basic mode TE<0>11 wave used for communication is propagated and the TM<0>01 mode wave is cut off. |
