Bandwidth Behavior and Improvement of Miniature Cavity Antennas With Broadside Radiation Pattern Using a Metasurface

Martinis, Mario; Mahdjoubi, Kouroch; Sauleau, Ronan; Collardey, Sylvain; Bernard, L.

doi:10.1109/tap.2015.2405074

Cited by 15 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 5 represents the model for a cavity with a metasurface at the aperture. This is essentially the same as the model analyzed in [8]. Arranging multiple smaller patches instead of a single large patch leads to a decrease of the series "patch inductance", and gives the desired result of only a capacitance C eq at the aperture.…”

Section: Transmission Line Model Of a Cavity Metasurfacementioning

confidence: 86%

“…Such a shape allows for minimizing the disturbance of the field distribution at the aperture while effectively working as a distributed capacitance at the aperture. The gap g between the strips is adjusted to reach the right value of capacitance loading at the antenna aperture, as is the same for the rectangular case [8]. Increasing this gap g leads to a decrease of the capacitance value.…”

Section: Description Of the Proposed Antennamentioning

confidence: 99%

“…Furthermore, the integration of microstrip antennas into small cavities leads to antenna performance degradations. These have been investigated over the past decades in [3][4][5][6], and more recently in [7][8][9]. In particular, the reduction of the antenna diameter and its integration into a metallic cavity result in a significant decrease of its BW.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it was demonstrated in [7] that, for small cavities of rectangular shape (edge size of 0.25 λ 0 , where λ 0 is the wavelength in vacuum at the operating frequency), a patch antenna placed at the aperture of the cavity does not offer the best performance in terms of BW: The maximum reachable BW was shown to be achieved by replacing a standard patch at the aperture with a metasurface composed of one or several layers of capacitively coupled strips [8], whose dimensions are typically smaller than one tenth of the wavelength [10]. As introduced in previous works [7][8][9]11], loading the aperture of a metallic cavity antenna with a capacitance-only impedance offers two benefits: Increasing the antenna BW [7], particularly compared to stacked patch antennas embedded in a larger cavity [11]; or reduction of the antenna and cavity size for a given BW [9].…”

Section: Introductionmentioning

confidence: 99%

“…The novelty of the proposed work resides in two main aspects. First, our previous work on small rectangular cavity antennas [8] is extended here to the cases of circular cavities with a small diameter (0.25 λ0), with the main objective to enlarge the antenna BW. Second, the metasurface antennas proposed here are integrated in very small cavities (0.15 λ0 and 0.12 λ0).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Metasurface Antennas Embedded in Small Circular Cavities for Telemetry Applications

et al. 2019

Self Cite

View full text Add to dashboard Cite

This paper introduces a metasurface-inspired antenna embedded in a circular metallic cavity with a very small diameter (from 0.25 λ0 down to 0.12 λ0, where λ0 is the wavelength in vacuum at the operating frequency). The proposed concept is introduced and explained: It consists of placing a capacitive surface at the cavity aperture. This capacitive effect is obtained using multi-layer capacitively coupled strips. Our numerical results demonstrate that the impedance bandwidth is larger than that of standard patch antennas embedded in the same cavity size. Various prototypes have been manufactured, and measurements are found to be in good agreement with numerical results in all cases. The practical applications of these small metasurface antennas are demonstrated with telemetry applications for flying vehicles.

show abstract

Section: Transmission Line Model Of a Cavity Metasurfacementioning

confidence: 86%

Section: Description Of the Proposed Antennamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Metasurface Antennas Embedded in Small Circular Cavities for Telemetry Applications

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

Circularly polarized global navigation satellite systems metasurface antennas in sub-wavelength metallic cavities

Garcia-Gamez

Bernard

Sauleau

et al. 2023

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

Two metasurface-inspired antennas embedded in a metallic cavity are introduced here. They are expected to be integrated on fast moving platforms enduring harsh accelerations and shocks. The metasurface allows enlarging the antenna bandwidth that is intrinsically reduced for small antennas embedded in sub-wavelength metallic cavities. The first one is only 60 × 60 × 20 mm3 (0.23λ1 × 0.23λ1 × 0.08λ1 at the frequency of 1164 MHz) and presents a dual-band behavior, covering both the lower and upper global navigation satellite systems (GNSS) bands (all GNSS bands are covered). It is fed by four probes and a dedicated circuit, ensuring the phase quadrature between adjacent feeds to achieve circular polarization over these two bands. For the second proposed antenna, circular polarization is achieved using two feed points connected to the radiating aperture of size 50 × 50 × 20 mm3 (0.26λ0 × 0.26λ0 × 0.10λ0 at the frequency of 1559 MHz). It covers the E1, L1, B1, and G1 GNSS bands. The numerical results are successfully validated by measurements.

show abstract

Cavity-excited Huygens’ metasurface antennas for near-unity aperture illumination efficiency from arbitrarily large apertures

2016

View full text Add to dashboard Cite

One of the long-standing problems in antenna engineering is the realization of highly directive beams using low-profile devices. In this paper, we provide a solution to this problem by means of Huygens' metasurfaces (HMSs), based on the equivalence principle. This principle states that a given excitation can be transformed to a desirable aperture field by inducing suitable electric and (equivalent) magnetic surface currents. Building on this concept, we propose and demonstrate cavity-excited HMS antennas, where the single-source-fed cavity is designed to optimize aperture illumination, while the HMS facilitates the current distribution that ensures phase purity of aperture fields. The HMS breaks the coupling between the excitation and radiation spectra typical to standard partially reflecting surfaces, allowing tailoring of the aperture properties to produce a desirable radiation pattern, without incurring edge-taper losses. The proposed low-profile design yields near-unity aperture illumination efficiencies from arbitrarily large apertures, offering new capabilities for microwave, terahertz and optical radiators.

show abstract

Bandwidth Behavior and Improvement of Miniature Cavity Antennas With Broadside Radiation Pattern Using a Metasurface

Cited by 15 publications

References 14 publications

Metasurface Antennas Embedded in Small Circular Cavities for Telemetry Applications

Metasurface Antennas Embedded in Small Circular Cavities for Telemetry Applications

Circularly polarized global navigation satellite systems metasurface antennas in sub-wavelength metallic cavities

Cavity-excited Huygens’ metasurface antennas for near-unity aperture illumination efficiency from arbitrarily large apertures

Contact Info

Product

Resources

About