Accession Number : AD0757907

Title :   A Scanned Flush-Mounted Multimode Slot Antenna.

Descriptive Note : Rept. for Aug-Oct 70,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Wong,Jinny L. ; King,Howard E. ; Dybdal,Robert B.

Report Date : 31 JAN 1973

Pagination or Media Count : 22

Abstract : 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 L/S band frequencies for both air-filled and dielectrically loaded configurations. (Author)

Descriptors :   (*SLOT ANTENNAS, SCANNING), MULTIPLE OPERATION, DIELECTRICS, ANTENNA RADIATION PATTERNS, ELECTRICAL IMPEDANCE, MICROWAVE FREQUENCY

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE