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Accession Number:
ADA067307
Title:
Design of VHF and UHF Communications Air/Ground Antennas.
Corporate Author:
HARRY DIAMOND LABS ADELPHI MD
Report Date:
1979-03-01
Abstract:
Contemporary design concepts are investigated for improved ground-based antennas to be used in airground communication links. These concepts are based on requirements to maintain satisfactory and reliable communications - with coincident constraints of reduced transmitter power, handling tolerances, and design standardization for VHF and UHF antenna types, mounting brackets, etc. The study determined that four antenna designs will satisfy these requirements. Each design will cover a full communications frequency band, and will also provide improved radiation characteristics. The design findings and candidate antennas are reviewed in this report. The performance of the candidate antennas in a simulated operational environment is calculated and presented for several sets of conditions which closely resemble operational applications. While the analyses indicate that the predominant FAA requirements are satisfied by antennas presently available to the Agency, very significant gain deficiencies were detected in multiple-element antennas and are apparently due to the ferrite material used to achieve inter-element electrical isolation.
Descriptive Note:
Final rept. Feb 78-Feb 79,
Supplementary Note:
See also Rept. no. FAA-RD-79-7, AD-A066 185.
Pages:
0061
Contract Number:
DOT-FA78WAI-851
File Size:
17.99MB
