Scattering analysis of flat magnetic dipoles embedded in chiral multilayer structures

Rabelo, Nilson R.; Sant’Anna, Sidnei J. S.; Lacava, J. C. da S.; Fernandes, David

doi:10.1109/igarss.2012.6352289

Cited by 3 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned in [16,28], TM x 10 is the first resonant mode. Since its electric field does not vary along the z-axis, the fringing fields are in phase opposition, thus producing a null in the broadside direction of the antenna radiation pattern (perpendicularly to the yz plane of Figure 1).…”

Section: Antenna Analysismentioning

confidence: 99%

“…Thus, from the perspective of modal interference, any one of the three designed antennas could be used. Nonetheless, a simple way to suppress modes TM x 20 and TM x 21 consists of placing the feeder at y c = b/2, where their electric field is minimal [9,16,28]. In such case, only modes {1, 0} and {1, 2} need to be controlled in the antenna design.…”

Section: Antenna Analysismentioning

confidence: 99%

“…The effect of this criterion on the radiation pattern of hybrid antennas is analyzed next. Since now only modes {1, 0} and {1, 2} need to be controlled, the far electric field can be rewritten from (10) and (11) as [9,28] …”

Section: Antenna Analysismentioning

confidence: 99%

“…Here, as in [27], equivalent magnetic sources, positioned along the ungrounded patch walls, lead to the following expression [9,28]:…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

See 3 more Smart Citations

Analytical Model for Predesigning Probe-Fed Hybrid Microstrip Antennas

Rabelo

Lacava

Tinoco-S.

et al. 2018

International Journal of Antennas and Propagation

Self Cite

View full text Add to dashboard Cite

Based on the equivalent resonant cavity model, an effective analysis methodology of probe-fed hybrid microstrip antennas is carried out in this paper, resulting in a better understanding of the parameter interrelations affecting their behavior. With that, a new design criterion focused on establishing uniform radiation patterns with balanced 3 dB angles is proposed and implemented. Results obtained with the proposed model closely matched HFSS simulations. Measurements made on a prototype antenna, manufactured with substrate integrated waveguide (SIW) technology, also showed excellent agreement, thus validating the use of the cavity model for predesigning hybrid microstrip antennas in a simple, visible, and time-and cost-effective way.

show abstract

Section: Antenna Analysismentioning

confidence: 99%

Section: Antenna Analysismentioning

confidence: 99%

Section: Antenna Analysismentioning

confidence: 99%

“…Here, as in [27], equivalent magnetic sources, positioned along the ungrounded patch walls, lead to the following expression [9,28]:…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Model for Predesigning Probe-Fed Hybrid Microstrip Antennas

Rabelo

Lacava

Tinoco-S.

et al. 2018

International Journal of Antennas and Propagation

Self Cite

View full text Add to dashboard Cite

show abstract

“…As an initial application, the scattering matrix and the related characteristic parameters of a short electric dipole atop a single chiral layer have been derived and analyzed for the L-, C-and X-bands in [20] and [21]. This analysis is equivalent to taking the scattering matrix defined in (7) with the selements listed on the second row (Electric at z = d) of Table I. Subsequently, short magnetic dipoles at either the lower or the upper interface of a three-layer structure containing a chiral layer in-between (Fig.…”

Section: Scattering Analysis For Electric and Magnetic Dipolesmentioning

confidence: 99%

Scattering analysis of planar electric and magnetic dipoles in multilayered chiral structures

Rabelo

Lacava

Fernandes

et al. 2012

J. Microw. Optoelectron. Electromagn. Appl.

Self Cite

View full text Add to dashboard Cite

Abstract-This paper describes a model for the analysis of multilayered chiral structures containing planar electric and magnetic scattering elements of arbitrary shape, illuminated by an elliptically polarized plane wave. The particular case of a single chiral layer is analyzed and the scattering matrices for single and dual electric and/or magnetic dipole distributions are derived in an original way. As an application, the polarimetric response of a short electric or magnetic dipole is directly obtained from their scattering matrix.Index Terms-Chiral medium, electromagnetic scattering, Green's functions, layered media, radar remote sensing, spectral fields. The problem of electromagnetic scattering and propagation in structures composed of multiple layers of complex media appears often not only in microwave SAR remote sensing (e.g., stratified soil, crop and forest vegetation, snow and ice covers), but also in other diverse applications, such as: microstrip antennas, microwave monolithic integrated circuits (MMIC), printed circuit technology, mobile and wireless communications, medical imaging and diagnosing, geophysical mapping and planetary exploration. The efficient computational analysis of each of these cases requires accurate models that account for the geometric and electromagnetic characteristics of the particular structure under study, as well as for the specific electromagnetic excitation mechanism.For practical PolSAR remote sensing applications, such as image classification and sensor calibration, several models have been developed to properly characterize the electromagnetic scattering of diverse targets [7]. For example, forest canopy models based on the Radiative Transfer and smaller disks (for its leaves). On the other hand, taking into account the effect of multiple scattering from rough surfaces or volumetric interactions is not a simple task. Therefore, for an electrically dense medium, where scatterers are compactly distributed or the radiation frequency is such that the spacing between them is comparable to the wavelength, the fundamental RT assumption of independent scattering from the elements is no longer valid, thus requiring either complex model adjustments or a different model altogether [9].Another important consideration for the accuracy of a PolSAR remote sensing model is the dielectric properties of the media that constitute each layer. Specialized literature reveals a variety of such properties, for instance: natural media such as rocks, snow, and certain types of soil can not usually be considered homogeneous [10]. Also, scattering from natural terrain cover can be strongly Among the several different parameters used in the literature for polarimetric target characterization, the scattering matrix, which combines both polarimetric and electromagnetic properties of a given target, plays an important role. Once the scattering matrix for a given target is accurately determined, other polarimetric target descriptors (e.g., its polarimetric response, radar cross section, entropy, ani...

show abstract