Optimal positions of loading for a shortened resonant monopole using genetic algorithm

Zhao, Shujie; Coleman, C.M.

doi:10.1109/iceaa.2010.5650958

Cited by 1 publication

(4 citation statements)

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“…The latter approach can be addressed by adding capacitive loading to the top of the antenna, while the selfinductance of antenna can be increased by either adding wire length, or lumped inductive loads [5]. Lumped inductive loadings on the monopole have been investigated with optimal loading positions, though with significant degradation in efficiency [6]. Therefore, adding wire length to a fixed height antenna through helical windings turns to be the focus and objectives of this investigation.…”

Section: Size Reduction Strategymentioning

confidence: 99%

“…In previous investigations [6], near-optimal distributions of ideal lumped inductors on a 0.25 m monopole were found using MATNEC and a cost function (1) with finely selected weighting factors. In this investigation, the same antenna with realistic inductors consist of short helical windings is simulated and optimized, in order to verify the effectiveness of helical windings in adding self-inductance to a wire antenna.…”

Section: Matnec and Helical Windings Validationmentioning

confidence: 99%

“…There are conventionally two ways to increase self-inductance on a wire antenna, lumped inductive loading and additional wire length through helical windings. The first method had been investigated previously in [6], and therefore additional wire length will be investigated in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Optimal performance is considered with respect to radiation efficiency and bandwidth. The optimal loading distributions for a shortened resonant monopole using lumped inductors has been investigated using MATNEC and the optimized results show significant degradation in efficiency due to component loss [6].…”

Section: Introductionmentioning

confidence: 99%

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Optimal helical antenna with continuously varying radius using evolutionary optimizers

Zhao

Coleman

2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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The size reduction for wire antennas using lumped loading inductors is well known, but introduces significant degradation in efficiency and bandwidth. One of the alternative approaches to solve the problem is the increase of wire length for a fixed height. Various techniques have been investigated to introduce longer wire length, but this paper concentrates on helical windings with continuously varying radii. The continuously varying radii are represented using radial basis functions, which give maximized shape controllability with a minimal number of defining parameters. These parameters that define the shape of the helix are optimized with respect to both bandwidth and efficiency, and matching networks are included in the optimization. The results are obtained from an automated simulation tool (MATNEC) equipped with evolutionary optimizers. Using the proposed strategy, a performance improvement is predicted for an optimized helical winding structure with continuously varying radii.

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Section: Size Reduction Strategymentioning

confidence: 99%

Section: Matnec and Helical Windings Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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