Spiral Antennas Over Closely Spaced Ground,

Smith, D. W.; Mayes, P. E.

Spiral Antennas Over Closely Spaced Ground,

Active / Technical Report | Accession Number: ADP007449 | Need Help?

Abstract:

This paper describes recent progress in the development of low-profile radiating-line antennas for producing circularly polarized CP radiation. Numerical studies of annular sector and log-spiral radiating lines have been done using a numerical electromagnetics code based upon patch basis functions. The relative merits and performance limitations of annular sector ANSERLIN, one-arm spirals, and two-arm spirals are discussed. The results of the computer simulations were used to choose parameters for some physical models. Measured performance is close to that predicted by computer. A limiting factor in achieving large bandwidths has been traced to the rather slow rate of attenuation of the current along the antenna arm. Much greater bandwidth has been obtained by placing an absorbing film between the radiating arm and the ground plane.

Author(s):

Smith, D. W. ; Mayes, P. E.

Author Organization(s):

ILLINOIS UNIV AT URBANA ELECTROMAGNETICS LAB

Supplementary Note:

This article is from 'Proceedings of the Antenna Applications Symposium Held on 25-27 September 1991. Volume 1,' AD-A253 682, p404-433.

Pagination:

0029

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:

Approved For Public Release

RECORD

Collection: TR

Subject Terms

Communities of Interest:

Air Platforms

Descriptor(s):

*ANTENNAS, ATTENUATION, BANDWIDTH, COMPUTERS, FILMS, FUNCTIONS, LIMITATIONS, MODELS, PARAMETERS, PROFILES, RADIATION, RATES, SIMULATION

Field(s)/Group(s):

Electrical and Electronic Equipment

Keyword(s):

Low profile, Radiating line antennas, CP(Circularly Polarized), Electromagnetic code, ANSERLIN(Annular Sector), Component Reports

Report Date:

1992 Feb 01