Spiral top-loaded antenna: Characteristics and design

Bhojwani, H.; Zelby, Leon W.

doi:10.1109/tap.1973.1140508

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…We employ top-loading discs at each end of the dipole antenna to achieve self-resonance and use multiple folding arms to increase the radiation resistance. Both are well-known techniques to design well matched and highly efficient electrically small antennas [22][23][24][25]. We also use an optimisation process to achieve the desired current ratio for CP.…”

Section: Design Of An Electrically Small Turnstile Antennamentioning

confidence: 99%

Design of an electrically small circularly polarised turnstile antenna and its application to near‐field wireless power transfer

Yoon

Líu

2014

IET Microwaves, Antennas & Propagation

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An electrically small circularly polarised antenna is designed and applied to near‐field wireless power transfer as a means of alleviating orientation dependence. The antenna is miniaturised from a λ/2‐turnstile antenna by utilising the top loading and multiple folding techniques. A local numerical search is used to determine the optimal antenna dimensions to achieve good axial ratio and impedance matching. The resulting design has a kr of 0.67 and shows good circular polarisation characteristic with a 3% axial ratio bandwidth. The designed antenna is fabricated and its circular polarisation performance is verified in the far field. The power transfer efficiency is then examined in the near field via simulation and measurement. It is shown that the designed circularly polarised antenna is effective in mitigating orientation dependence down to a distance of 0.2λ.

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Section: Design Of An Electrically Small Turnstile Antennamentioning

confidence: 99%

Design of an electrically small circularly polarised turnstile antenna and its application to near‐field wireless power transfer

Yoon

Líu

2014

IET Microwaves, Antennas & Propagation

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“…There are two well-known techniques to overcome the small radiation resistance of electrically small antennas. The first one is to employ a top loading at each end of the dipole antenna to provide self-resonance characteristic on small antennas [80]. The second one is to use multiple folding to provide high radiation efficiency as described in Chapter 2.…”

Section: Design Of Electrically Small Turnstile Dipole Antennamentioning

confidence: 99%

Realizing Efficient Wireless Power Transfer in the Near-Field Region Using Electrically Small Antennas

Yoon¹,

Líu²

2012

Wireless Power Transfer - Principles and Engineering Explorations

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Note on impedance characteristics of L-shaped wire monopole antenna

Chen

2000

Microw. Opt. Technol. Lett.

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The impedance characteristics of an L‐shaped wire monopole antenna are experimentally investigated. The effect of different ratios of the horizontal arm length to the height of the L‐shaped monopole on the impedance characteristics is discussed. The investigation demonstrates how a monopole with an overall quarter‐wavelength converts to a low‐profile small inverted‐L antenna (ILA). It also shows that a height of ∼10% operating wavelength is a critical condition. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 26: 22–23, 2000.

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Spiral top-loaded antenna: Characteristics and design

Cited by 7 publications

References 6 publications

Design of an electrically small circularly polarised turnstile antenna and its application to near‐field wireless power transfer

Design of an electrically small circularly polarised turnstile antenna and its application to near‐field wireless power transfer

Realizing Efficient Wireless Power Transfer in the Near-Field Region Using Electrically Small Antennas

Note on impedance characteristics of L-shaped wire monopole antenna

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