Current distribution and input impedance of printed dipoles

Rana, I.; Alexopoulos, N.G.

doi:10.1109/tap.1981.1142536

Cited by 192 publications

(44 citation statements)

References 12 publications

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“…This value is such that the scattering resonance curve for a straight rod antenna embedded in a uniform dielectric of index n eff overlaps with the scattering resonance curve of the same antenna located at an interface between silicon and air, both curves being obtained by FDTD simulations. Although imperfect, our approach offers the advantage to preserve simplicity and comparisons with FDTD simulations will show that it is accurate enough to guide the design of optical components, answering doubts expressed in the past that the numerical solution presented here would accurately handle wire antennas in a space partially filled with dielectric medium 15,16 , such as antennas defined on a dielectric substrate. (4) The finite conductivity of gold is taken into account in our calculations (details in the Appendix) and is derived from the optical constants found in [17].…”

Section: Methods and Approximationsmentioning

confidence: 86%

“…Choosing a basis of Dirac functions greatly simplifies the evaluation of the integral over l ′ in Eqs. (15) and (16). We obtain:…”

Section: Numerical Solutionmentioning

confidence: 99%

“…This is exact in the case of a perfect electric conductor and represents an approximation in the case of real metals. Furthermore, using the thin-wire approximation (a << λ and a << h), we can consider the current distribution J(r) to be axial and azimuthally invariant 16 . We can thus define the quantity I(z) such that J(r) =ẑI(z)δ(ρ − a) 1 2πa .…”

Section: General Problemmentioning

confidence: 99%

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Modeling nanoscale V-shaped antennas for the design of optical phased arrays

et al. 2012

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We present a simplified numerical method to solve for the current distribution in a V-shaped antenna excited by an electric field with arbitrary polarization. The scattered far-field amplitude, phase and polarization of the antennas are extracted. The calculation technique presented here is an efficient method for probing the large design parameter-space of such antennas, which have been proposed as basic building blocks for the design of ultrathin plasmonic metasurfaces. Our calculation is based on the Integral Equation Method of Moments and is validated by comparison to the results of finite-difference time-domain (FDTD) simulations. The computation time is approximately five orders of magnitude less than for FDTD simulations. This speed-up relies mainly on the use of the thin wire approximation whose domain of validity is discussed. This method can be generalized to more complex geometries such as zigzag antennas.

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Section: Methods and Approximationsmentioning

confidence: 86%

“…Choosing a basis of Dirac functions greatly simplifies the evaluation of the integral over l ′ in Eqs. (15) and (16). We obtain:…”

Section: Numerical Solutionmentioning

confidence: 99%

Section: General Problemmentioning

confidence: 99%

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Modeling nanoscale V-shaped antennas for the design of optical phased arrays

et al. 2012

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“…1, in which it has been assumed that the photomixer is grown on a (1800 × 1800 × 300) µm 3 GaAs substrate with a relative dielectric constant of ε r = 12.9. It is well known that a higher input impedance can be achieved using a resonant dipole that is printed on a thin grounded substrate [17]. Therefore, a thin Arlon AD 320 dielectric substrate has been inserted between the Gold dipole and the reflecting surface.…”

Section: Antenna Configuration and Efficiencymentioning

confidence: 99%

A Photomixer Driven Terahertz Dipole Antenna With High Input Resistance and Gain

Yin¹,

Kennedy²,

Sarma³

et al. 2015

PIER M

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Abstract-A terahertz (THz) antenna is proposed that offers high input resistance and gain in the presence of an electrically thick GaAs substrate. The antenna is centrally fed using two vertical probes connected to a photomixer on a thin low temperature grown gallium arsenide (LTG-GaAs) film which is supported by the GaAs substrate. An input impedance of ∼ 3.3 kΩ has been achieved using a dipole antenna that is printed on a thin dielectric slab, and isolated from the supporting substrate using a metal ground plane. A square aperture has been introduced to facilitate the illumination of the photomixer with two laser beams. Furthermore, a frequency selective surface (FSS) has been incorporated in the configuration, which results in a broadside gain of ∼ 19 dBi at a resonance frequency of 0.97 THz.

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“…According to [26], the integration alone the k z axis is deformed as shown in Fig. 2 to avoid the poles of the integrand between k z = k 0 and k z = √ ε r k 0 .…”

Section: Formulationmentioning

confidence: 99%

Radiation Patterns Synthesis for a Conformal Dipole Antenna Array

He¹,

Wang²

2007

PIER

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Abstract-A conformal cylindrical dipole array is developed in this paper. Because the conformal dipole array is curved, new far field pattern behaviors emerge. In this paper, we start to analyse the equations for the far field of the conformal dipole array by using the method of moments (MoM) with a dyadic Green's function, and then validate the accuracy of the far field expressions. Next, a novel Gauss amplitude distribution, which is capable to yield a desired far field radiation pattern when the array structure has a relative small cylindrical radius, is proposed. The advantage of the proposed method is that it can provide good aperture distributions to obtain low sidelobe level.

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Current distribution and input impedance of printed dipoles

Cited by 192 publications

References 12 publications

Modeling nanoscale V-shaped antennas for the design of optical phased arrays

Modeling nanoscale V-shaped antennas for the design of optical phased arrays

A Photomixer Driven Terahertz Dipole Antenna With High Input Resistance and Gain

Radiation Patterns Synthesis for a Conformal Dipole Antenna Array

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