A Scanned Flush-Mounted Multimode Slot Antenna.
Rept. for Aug-Oct 70,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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The report describes the electrical characteristics of a multimode slot antenna that has a scan capability. The antenna consists of a rectangular slot with a onewavelength aperture, excited with an offset probe, that couples energy into the desired TE sub 10 and TE sub 20 rectangular waveguide modes. This combination of modes produces a beam that is tilted from the slot broadside. The resultant beamwidth is narrower than that of a comparable slot excited in the dominant mode. The beam shape and scan angle depend on operating frequency and relative excitation of the two modes. A slot was mounted axially on a circular cylinder, and pattern, gain, and VSWR measurements were performed at LS band frequencies for both air-filled and dielectrically loaded configurations. Author
- Electrical and Electronic Equipment