Accession Number : ADD014361

Title :   Dual Frequency Launcher for Circularly Polarized Antenna.

Descriptive Note : Patent, Filed 10 Aug 88, patented 3 Oct 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Chen, Ming H

Report Date : 03 Oct 1989

Pagination or Media Count : 4

Abstract : A dual frequency antenna feed is formed from a central, circular waveguide connected to the flat boundry of circular, disk-shaped resonant cavity. A second circular waveguide is connected one end of a disk-shaped resonant cavity. Energy of one frequency enters and exits the cavity along the common axis of the waveguides. Energy of the second frequency is introduced to the same resonant cavity by way of a plurality of bandpass filters, also connected to the cavity. This energy enters by way of slots in the cylindrical walls of the cavity. The central circular waveguide is propagating at one frequency but cut off at the second frequency. These bandpass filters are at this pass band for the second frequency, but at the rejection band for the first frequency. Therefore, the isolation between these two input ports are obtained. Patents. (aw)

Descriptors :   *ANTENNA FEEDS, *CIRCULAR ANTENNAS, *PATENTS, BANDPASS FILTERS, CAVITIES, CIRCULAR, CYLINDRICAL BODIES, DUAL MODE, ENERGY, FREQUENCY, FREQUENCY BANDS, ISOLATION, LAUNCHERS, POLARIZATION, PROPAGATION, RESONANCE, WALLS, WAVEGUIDES

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE