Low sidelobe reflector antenna design for communications
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Authors
Armas, Nelson A.
Subjects
AN/MRC-142 Marine radio
Low sidelobes
Reflectors
Method of Moments
Low sidelobes
Reflectors
Method of Moments
Advisors
Jenn, David C.
Date of Issue
1993-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The current antenna used in the Marine Radio AN/MRC-142 is a focal point fed reflector with a first sidelobe of -10 dB. A new antenna design is required with a sidelobe reduction of another 10 dB, and a minimum impact on the system upgrade cost. An improved feed consisting of a fed dipole and disk in the vicinity of a parasitic ring was designed for use with the current reflector. The disk acts as a ground plane for the dipole, with the ring narrowing the beamwidth. resulting in a stronger edge taper on the reflector. An existing computer code based on the method of moments was used to compute the gain and the radiation pattern. Circular parabolic reflectors of 36 inches and 48 inches were analyzed. The results show that the 36 inch reflector cannot satisfy the conditions over the entire frequency band (1350 to 1850 MHz) simultaneously. The 48 inch reflector came very close to satisfying all the conditions, although the sidelobe level is off by approximately 2 dB at wide angles in the H-plane
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
69 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.