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Design and Optimization of Nonuniform Helical Antennas With Linearly Varying Geometrical Parameters
- Source :
- IEEE Access, Vol 7, Pp 136855-136866 (2019)
- Publication Year :
- 2019
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2019.
-
Abstract
- Nonuniform helical antennas have many degrees of freedom, which makes the search space for the optimal design very challenging. The objective of this paper is to systematically analyze nonuniform helical antennas with linearly varying geometrical parameters and to provide analytical equations that approximate the optimal design and the gain of the designed antennas. Using various optimization algorithms, we made a large database of the optimal nonuniform helical antennas with linearly varying geometrical parameters. Based on these results, we made analytical equations that approximate the optimal design and the gain of the designed antennas. These equations allow for a fast design procedure yielding all necessary parameters needed for the design and fabrication of nonuniform helical antennas that meet specified characteristics. Special attention is devoted to antenna losses. Antennas designed following the presented procedure achieve around 2.5 dB higher gain than uniform helical antennas of the same axial length, while maintaining the bandwidth and axial ratio. As a verification of the proposed design procedure, a helical antenna with the central operating frequency of 1 GHz was designed, simulated, fabricated, and measured. The comparison between measured and simulated results confirms the validity of the presented design procedure.
- Subjects :
- Optimal design
Fabrication
General Computer Science
Optimization algorithm
Computer science
Axial ratio
05 social sciences
Bandwidth (signal processing)
General Engineering
Operating frequency
050801 communication & media studies
020206 networking & telecommunications
Analytical equations
02 engineering and technology
Nonuniform helical antennas
Topology
0508 media and communications
0202 electrical engineering, electronic engineering, information engineering
General Materials Science
lcsh:Electrical engineering. Electronics. Nuclear engineering
Helical antenna
optimization
lcsh:TK1-9971
Computer Science::Information Theory
Subjects
Details
- ISSN :
- 21693536
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- IEEE Access
- Accession number :
- edsair.doi.dedup.....a83140137757c57e93871fd2dd8ae412