Near-Field Focusing in One Plane Using a Loaded Sectoral Horn Antenna

Clauzier, Sébastien; Avrillon, Stéphane; Coq, Laurent Le; Himdi, Mohamed; Colombel, Franck; Rochefort, and Erwan

doi:10.2528/pierl12122107

Cited by 3 publications

(10 citation statements)

References 12 publications

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“…As seen in [8] and considering the reference plane at z = 0, the phase distribution along the aperture needed to focus the beam at a distance d f must be equal to

\begin{matrix} right leftthickmathspace.5em \\ φ_{normalf} (x, z) = φ_{normalf} (z) = k \cdot d_{normalf} (1 - \frac{1}{\cos (β)}) = k \cdot (d_{normalf} - \sqrt{z^{2} + d_{f}^{2}}) \end{matrix}

where k = (2 π / λ ) is the free space constant.…”

Section: Design Process Of the Near‐field Focusing Slotted Waveguide mentioning

confidence: 99%

“…As seen in [8] and considering the reference plane at z=0, the phase distribution along the aperture needed to focus the beam at a distance must be equal to:…”

Section: Presentation Of the Near-field Focusing Techniquementioning

confidence: 99%

“…Such a phase variation along the aperture can be obtained in different ways: a first solution consists in modifying the field distribution of horn antenna by inserting a dielectric lens inside its aperture as shown in [8]; a second solution uses the modification of the complex propagation wave number to obtain the require phase variation; another solution is based on the synthesis of such a variation thanks to discrete radiating sources. This second solution is proposed in the paper: a slotted waveguide antenna is designed, optimizing the slots and their positions on the waveguide to obtain the desired field distribution.…”

Section: Figure 1: Illustration Of Near-field Focusing Theorymentioning

confidence: 99%

“…In such applications, the antenna has to accept high power with a good radiation efficiency, so we will favour a complete waveguide technology. In [8], a horn antenna with a biconvex dielectric lens inserted in its aperture has been investigated to provide a two dimensional focused beam. But the addition of the lens in the aperture of the H-plane sectoral horn reduces the beam width in the E-plane and the maximum ratio length/width of the beam at the focal point was equal to 8.…”

Section: Introductionmentioning

confidence: 99%

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Slotted waveguide antenna with a near‐field focused beam in one plane

Clauzier¹,

Avrillon

Coq

et al. 2015

IET Microwaves, Antennas & Propagation

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Abstract---A slotted waveguide providing a two dimensional near-field focused beam is presented in this paper. This antenna focuses the beam in the E-plane and provides a wide beam in the H-plane in order to illuminate a linear array, as reflect-or transmit-array antenna with a small width (100mm) and a very large length (1530mm) located in the near-field region. The simulated field distribution on the array is found to be in very good agreement with the measurement of a prototype at 9.41GHz.

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“…As seen in [8] and considering the reference plane at z = 0, the phase distribution along the aperture needed to focus the beam at a distance d f must be equal to

\begin{matrix} right leftthickmathspace.5em \\ φ_{normalf} (x, z) = φ_{normalf} (z) = k \cdot d_{normalf} (1 - \frac{1}{\cos (β)}) = k \cdot (d_{normalf} - \sqrt{z^{2} + d_{f}^{2}}) \end{matrix}

where k = (2 π / λ ) is the free space constant.…”

Section: Design Process Of the Near‐field Focusing Slotted Waveguide mentioning

confidence: 99%

“…As seen in [8] and considering the reference plane at z=0, the phase distribution along the aperture needed to focus the beam at a distance must be equal to:…”

Section: Presentation Of the Near-field Focusing Techniquementioning

confidence: 99%

Section: Figure 1: Illustration Of Near-field Focusing Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Slotted waveguide antenna with a near‐field focused beam in one plane

Clauzier¹,

Avrillon

Coq

et al. 2015

IET Microwaves, Antennas & Propagation

Self Cite

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“…In [3], the equations to calculate the lens shape are explained. The authors have considered free space on both sides of the lens (Fig.…”

Section: Calculation Of Lens Shapementioning

confidence: 99%

60 GHz foam‐based antenna for near‐field focusing

et al. 2014

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An innovative way to manufacture a sectoral horn antenna with a biconvex dielectric lens is presented. The antenna focuses on the near-field signal in the H-plane to illuminate a linear array for example. It is made of only two symmetrical pieces of foam and a metallic support. A prototype is manufactured and measured at 60 GHz to verify its focusing properties and validate the technological process.Introduction: Nowadays, near-field focusing antennas are mainly used for imagery sensing, and characterisation of materials or biomedical devices. By increasing the working frequency, they could be used for point-to-point communication inside a device. Higher frequencies allow a larger bandwidth for high rate transmission.Such a system includes two different parts. The first one is the radiating source which creates a plane wavefront. The second one corrects the phases in order to focus the signal at the desired focal zone in front of the antenna.Several types of antennas already exist to focus in the near-field. An array of patches [1] or slotted waveguides [2] can be used. Lenses can also focus in the near-field. A metallic horn with a dielectric lens has already been manufactured [3]. This kind of system can be used to feed a reflect-or transmit-array [2], but it can directly be used to communicate with a receiver if it has the same capability of focusing.In this Letter, a sectoral horn antenna is presented, loaded with two biconvex lenses. In the following Section, the shapes of the two lenses are designed and the final prototype is simulated. In the subsequent Section, the technological process is presented in order to manufacture the lenses (in particular the dielectric constant). Then the measurement results at 60 GHz are compared with simulation results to validate the prototype.

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