Accession Number:

ADA076539

Title:

Design of Shipboard HF Antennas for Broadband Characteristics.

Descriptive Note:

Technical document,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

• Goodbody,R. L.

Report Date:

1979-09-01

Pagination or Media Count:

18.0

Abstract:

Typical US Navy ships have 5 to 19 hf transmitters and 6 to 24 or more hf receivers which must all be capable of operating simultaneously without mutual interference. Achieving this capability is made difficult by rf currents induced on all the complex conducting shapes on the structure when electromagnetic energy is radiated or received. The topside in effect acts as a complex antenna. The topside has some highly undesirable shapes from the point of view of the antenna designer. Prominent ship features such as corners, masts, and yard-arms have a strong effect on hf antenna characteristics. The antenna designer must therefore be sophisticated in the use of rf filters and in the placement and control of hf antennas and rf conductors in the ships topside. This document provides guidance in design of broadband hf antennas on ships. It will be useful to engineers not familiar with Navy shipboard hf antenna systems. It will also be useful to shipyard engineers in the determination of antenna construction techniques. Author

Descriptors:

• *BROADBAND ANTENNAS
• *SHIP ANTENNAS
• HIGH FREQUENCY
• RADIATION ABSORPTION
• ELECTROMAGNETIC INTERFERENCE
• ELECTRICAL IMPEDANCE
• ANTENNA RADIATION PATTERNS
• FARADAY EFFECT
• Q FACTOR

Subject Categories:

• Electrical and Electronic Equipment
• Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE