A miniturized, circularly polarized log periodic dipole array

Haney, Joshua B; Lim, Su Jun

doi:10.1109/iwat.2016.7434807

Cited by 2 publications

(3 citation statements)

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“…The CP line arrays based on LPDA have no bandwidth limiting factors other than dipole length ideally. The investigation of CP LPDA is limited and only a few researches has focused on the realization of CP LPDA [23], [24], [25]. In [23], a set of crossed dipoles with a distance logarithmically increased was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…The dipoles are fed by TEM transmission line. In [24] and [25], also unequal length crossed dipole is employed as the CP element of LPDA. However, the proposed CP element has a narrow AR bandwidth (ARBW).…”

Section: Introductionmentioning

confidence: 99%

“…Different from [23], [24], [25], crossed dipole with equal length is employed in the proposed CP LPDA. The CP radiation is achieved by separating the crossed dipoles with a distance of λ/8.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of a Circularly Polarized Log-Periodic Dipole Antenna

Wei,

Zhang,

Sun

et al. 2024

IEEE Open J. Antennas Propag.

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In this letter, a circularly-polarized (CP) log-periodic dipole antenna (LPDA) is investigated. Eight crossed dipole cells with a logarithmically increased λ/8 separation are employed to form the proposed CP LPDA. The dipoles with increased length and spacing are fed in series by an air-filled parallel line. The working mechanism of the generation of back-fire CP radiation is illustrated by an array analyzation. Besides, the LPDA design factors for both polarizations are analyzed in detail to realize an optimized CP performance. To validate the performance of the proposed eight-element CP LPDA, a prototype was fabricated and measured. The measured axial ratio (AR) bandwidth (0.8-2.5 GHz) is coincident with the impedance bandwidth (0.8-2.43 GHz), and it can be further increased with more elements. The overlapping bandwidth with VSWR < 2, AR < 3 dB, gain variation < 3 dB, and back-fire gain > 5 dBic is 0.94-2.43 GHz (2.6:1), and the radiation pattern is stable across the entire band.INDEX TERMS Circularly-polarized (CP), frequency independent, log-periodic dipole antenna (LPDA), wideband.L

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