Resonant frequency and radiation efficiency of meander line antennas

Endo, Tsutomu; Sunahara, Yonehiko; Satoh, Shin’ichi; Katagi, Takashi

doi:10.1002/(sici)1520-6432(200001)83:1<52::aid-ecjb7>3.3.co;2-z

Cited by 14 publications

(19 citation statements)

References 1 publication

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“…4a). In this approach, the inductance of the meander line, which consists of a line (creating a chain) of the letter-C shape is calculated [7,10]. Next, the inductance of the straight line connecting all contours is added, in order to obtain the total inductance of the antenna.…”

Section: Fig 3 the First Four Geometrical Iterations Of Hilbert's Fmentioning

confidence: 99%

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Sikorski¹,

Szymczak²,

Siodła³

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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Science and Technology article citation info: IntroductionLarge power transformers are the most critical component in electric power systems, as they are essential in maintaining a reliable supply of electric energy. There are many factors which cause a transformer malfunction, but those, which can potentially lead to catastrophic failure are winding damages (due to short-circuit, lightning, and other over-voltages) and insulation system failure (moisture, thermal aging, partial discharges). The damage from a catastrophic transformer failure may run into tens of millions of dollars [16]. To avoid such a scenario, power utilities are moving towards continuous transformer condition monitoring, based on dissolved gas analysis and acoustic emission (AE) or electromagnetic (HF/VHF/UHF) partial discharge detection.According to the newest research results and analyses presented by the experts of the CIGRE Working Group A2.37, in the technical brochure 642: Transformer Reliability Survey, the main reason of breakdowns of high voltage power transformers is damage to the windings and the main insulation system [3]. Mechanical defects in the form of winding deformations (axial displacements and radial deformations) and deterioration of insulation properties associated with thermal aging processes [6], can lead to the initiation of the partial discharge (PD) phenomena occurrence.In recent years, in the electric power industry and research centres, a trend consisting in developing and implementing advanced

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Section: Fig 3 the First Four Geometrical Iterations Of Hilbert's Fmentioning

confidence: 99%

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Sikorski¹,

Szymczak²,

Siodła³

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…The antenna also contains other lines that do not fall under the parallel line definition. The design of a Hilbert IFA can proceed based on the inductance equivalence concept introduced in [26]. This requires computing the inductance of the Hilbert antenna using simple formulas.…”

Section: Simple Design Procedures For a Hilbert Ifamentioning

confidence: 99%

A New Class of Miniature Embedded Inverted-F Antennas (IFAs) for 2.4 GHz WLAN Application

Azad

Ali

2006

IEEE Trans. Antennas Propagat.

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Abstract-A new class of miniature printed embedded inverted-F antennas are proposed for operation in the 2.4-2.485 GHz wireless local-area network band. One of the proposed antennas on FR4 substrate (dielectric constant = 4.4) measures 9.2 mm by 4.1 mm and has a bandwidth of 3.5%. The peak gain of this antenna is 1.4 dBi. An overall size reduction of 70% is achieved compared to a conventional inverted-F antenna. Effects of dielectric loss tangent and material conductivity on the bandwidth and efficiency of these antennas are also investigated. Finally, two embedded antenna elements are analyzed to demonstrate the feasibility for a decoupled antenna pair consisting of switched and combining diversity schemes.

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“…A MLA is constructed by continuously folding a conventional monopole/dipole antenna, which can also be printed on a dielectric substrate as a planar form. The resonant frequency and radiation efficiency of MLA can be approximately determined from the geometrical parameters using the equivalent model of a linear dipole antenna with inductive loading [11][12][13]. However, this conventional MLA exhibits a narrow impedance bandwidth and sensitive impedance matching [10,12].…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Enhancement for Low Frequency Meander Line Antenna

Fan¹,

Lei²,

Xie³

et al. 2014

PIER C

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Abstract-A simple and effective method of bandwidth enhancement for the printed meander line antenna (MLA) is proposed. This approach is characterized by symmetrically printing two meandering sections on both sides of a dielectric substrate and connecting them via shorting pins at the bottom of meandering sections, which are connected to a capacitive stripe for impedance matching. The illustrative equivalent circuit and the corresponding principle of bandwidth enhancement of this double-layered MLA are presented. The measured results of these double-layered and single-layered MLAs manifest the validity of our design approach.

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Resonant frequency and radiation efficiency of meander line antennas

Cited by 14 publications

References 1 publication

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

A New Class of Miniature Embedded Inverted-F Antennas (IFAs) for 2.4 GHz WLAN Application

Bandwidth Enhancement for Low Frequency Meander Line Antenna

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