Four-arm 2nd- mode slot spiral antenna with simple single-port feed

The design and performance of a novel 4-arm equiangular slot spiral antenna operating in the 2nd mode are discussed in this letter. A straightforward feeding method consisting of a single vertical coaxial probe and no underlying mode forming network is proposed. Along with inherent simplicity, this...

Full description

Saved in:
Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2005, Vol.4, p.213-216
Main Authors: Stutzke, N.A., Filipovic, D.S.
Format: Article
Language:English
Subjects:
Antenna feeds
Antenna measurements
Antennas
Bandwidth
Coaxial components
Finite element methods
Integral equations
Iron
Log spiral antennas
Mathematical models
Networks
Noise levels
Performance gain
Probes
Slot antennas
Spiral antennas
Spirals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The design and performance of a novel 4-arm equiangular slot spiral antenna operating in the 2nd mode are discussed in this letter. A straightforward feeding method consisting of a single vertical coaxial probe and no underlying mode forming network is proposed. Along with inherent simplicity, this feed enables design flexibility with respect to the slot-to-metal ratio, growth rate, and other spiral parameters. Numerical tools including an in-house finite element-boundary integral (FE-BI) code and Ansoft HFSS are used in designing the antenna. Good performance over an octave bandwidth is achieved, with axial ratio and WoW less than 3 dB, nominal gain of 3 dBic, and VSWR less than 1.6. Performance is verified with measurements. A method for increasing the bandwidth up to 3 : 1, which is the theoretical value determined by the excitation of the first higher order mode, is demonstrated computationally.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2005.851006