Helical Beam Antennas for Wide-Band Applications

Kraus, John

doi:10.1109/jrproc.1948.231603

Cited by 133 publications

(112 citation statements)

References 3 publications

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“…7 shows the rapid decrease of higher order Bessel function terms. This illustrates the justification of truncating the infinite series solution of G 0 (w) and G 2 …”

Section: Electric Field Formulationmentioning

confidence: 88%

“…As these integrations do not have exact closed-form solutions, the resulting electric field expressions are not closed-form. In this paper, an approximate closed-form solution of (3) (1) and (2).…”

Section: Theorymentioning

confidence: 99%

“…The electric field in the far field or Fraunhofer region of an antenna is independent of the distance of the observation point from the antenna [1], [2]. Most analysis of radiation characteristics of an antenna involves the Fraunhofer zone.…”

Section: (W)mentioning

confidence: 99%

“…Horn antennas are widely used as feeds of reflectors, lenses and compound antennas [1], [2]. Their widespread use stems from their simple, solid geometry and excellent performance in terms of beam directivity.…”

Section: Introductionmentioning

confidence: 99%

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Approximate Closed-Form Expression of the Electric Field of a Conical Horn Antenna

Zaman¹,

Gaffar²,

Alam³

et al. 2011

IJCEE

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Abstract-In this paper, an approximate closed-form expression of the electric field of a conical horn with linear flare is formulated. Copolarization and cross polarization component of the electric field are calculated from the spherical field components using Ludwig's third definition of copolarization and cross polarization. The calculated field expression is found to be in close agreement with experimental results found in literature. The radiation characteristics of the conical horn are analyzed using the derived field expressions.Index Terms-Conical horn antenna, copolarization and cross polarization.

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“…7 shows the rapid decrease of higher order Bessel function terms. This illustrates the justification of truncating the infinite series solution of G 0 (w) and G 2 …”

Section: Electric Field Formulationmentioning

confidence: 88%

Section: Theorymentioning

confidence: 99%

Section: (W)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Approximate Closed-Form Expression of the Electric Field of a Conical Horn Antenna

Zaman¹,

Gaffar²,

Alam³

et al. 2011

IJCEE

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“…While the patch antenna offers favourable broadbeam radiation pattern characteristics and reasonable efficiency provided the dielectric losses are low [4], the miniaturisation offered by the wavelength compression potentially requires very high dielectric permittivity values ε r to compress the large wavelengths into an acceptable volume. The patch antenna is known to be intrinsically relatively narrowband compared to the half-wavelength wire dipole for example [4], with the bandwidth still further reduced by increased ε r [5].…”

Section: Introductionmentioning

confidence: 99%

Radiation Efficiency Analysis of Balanced-Impedance Hexaferrite Substrate for Antenna Miniaturisation

James

Hilton²,

Beach³

2017

Loughborough Antennas &Amp; Propagation Conference (LAPC 2017)

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractAntenna miniaturisation in the low UHF band is required since the wavelengths are large compared to portable consumer terminals. Magneto-dielectric substrates such as hexaferrites which increase µ r as well as ε r have received attention for their miniaturisation potential, however there is a shortage of published results for the radiation efficiency of such antennas based on full 3D radiative characterisation in free space conditions. In this work, patch antennas fabricated on hexaferrite, FR-4 and RT5880 substrates were examined through simulation, fabrication and radiative measurement. While the frequency in hexaferrite was reduced by a factor of six compared to the RT5880 antennas, the efficiency in the hexaferrite antennas was low. The combined effect of the losses in the hexaferrite and the electrically small size of the resulting patch antenna limits its use in long range transmitting applications, though it may still find application in short range or receiver applications.

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