Leakage fields from planar semi-infinite transmission lines

Villegas, F.J.; Jackson, David R.; Williams, J.T.; Oliner, A.A.

doi:10.1109/22.754878

Cited by 24 publications

(13 citation statements)

References 12 publications

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“…Those for the first two cases, i.e., the physical-lit and physical-dark regions, will be given in summary only since their detailed derivation can be found in Villegas et al [1999].…”

Section: Asymptotic Evaluation Of Radiation Integralmentioning

confidence: 99%

“…In this case the SPP is not encountered by the integration path C. Therefore, a simple application of integration-by-parts (IP) provides an asymptotic expression for the radiated field. Once again, omitting the details of the calculation [see Villegas et al, 1999], the result is given as…”

Section: Physical Regionmentioning

confidence: 99%

“…Nevertheless, the UAE formulas lose the simple physical interpretation provided by (10) and (12). The details of the UAE formulation are presented by Villegas et al [1999] and are omitted here.…”

Section: Physical Regionmentioning

confidence: 99%

“…[2] In the recent past, extensive investigations have led to an increased understanding of the power leakage from leaky modes on printed-circuit lines (Das and Pozar [1991] through Villegas et al [1999]). For covered structures having a sufficiently small ground plane separation, leakage occurs into the TM 0 parallel-plate mode of the substrate structure that surrounds the printedcircuit line.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, however, a study was made of the radiation characteristics of semi-infinite transmission lines [Villegas et al, 1999]. This provides a canonical model for leakage on a certain class of practical circuits for which a leaky mode is launched from a feed point and then propagates in one direction along the line from the feed.…”

Section: Introductionmentioning

confidence: 99%

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Radiation properties of leaky modes near the spectral gap region for semi‐infinite printed‐circuit lines

et al. 2003

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[1] The radiation field from a leaky mode on a semi-infinite printed-circuit line is investigated. Asymptotic formulas for the radiation field are presented for a mode that is either in the physical region (a fast wave with respect to the substrate mode into which leakage occurs), or in the spectral-gap region (a slow wave). These formulas, as well as a numerically exact representation of the leaky-mode radiation field, are used to examine the nature of the radiation field and to study how it changes as the leaky mode transitions from the physical region to the spectral-gap region. A comparison is made between the field radiated by the leaky-mode current and that radiated by a practical probe feed that launches the semi-infinite leaky mode current. Another comparison is made between the field radiated by the leaky-mode current and the exact field radiated by the total current that is excited by a practical gap voltage source on an infinite line.

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“…Those for the first two cases, i.e., the physical-lit and physical-dark regions, will be given in summary only since their detailed derivation can be found in Villegas et al [1999].…”

Section: Asymptotic Evaluation Of Radiation Integralmentioning

confidence: 99%

Section: Physical Regionmentioning

confidence: 99%

Section: Physical Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiation properties of leaky modes near the spectral gap region for semi‐infinite printed‐circuit lines

et al. 2003

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Efficient full‐wave analysis method of leaky‐wave modes in periodically loaded dielectric waveguides with application to backward‐to‐forward frequency‐scannable antennas and metamaterials

Gómez‐Tornero¹,

García²,

Álvarez‐Melcón³

2006

Int J Numerical Modelling

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SUMMARYThis work presents a novel and efficient full-wave method specifically conceived for the modal analysis of periodic planar metallizations printed on the open side of a dielectric rectangular waveguide. This particular type of structures can be used to conceive interesting backward-to-forward frequency-scanning periodic leaky-wave antennas, including leaky-wave antennas based on the composite right-left-handed transmission line concept (metamaterial). For the analysis, the spectral-domain Green's functions are obtained by expanding the electromagnetic fields as a double summation of Floquet and parallel-plate modes. An original and simple coupled equivalent circuit is used to deal with the multilayered stratification arrangement and the top radiation boundary. The method of moments (MoM) is applied to solve the corresponding EFIE/MFIE, and an original iterative technique is used to search for the complex leakywave mode zeros of the determinant of the MoM matrix. All the expressions are in closed form, while keeping its full-wave nature. The convergence and the accuracy of the method are both studied. Once the backward leaky-waves are found, some interesting phenomena are examined, such as backward-to-forward beam scanning, appearance of bandgaps, mode coupling, multi-space-harmonic radiation, and antenna aperture illumination control. By studying a practical antenna and by comparing with previously published methods, it is shown the importance of a full-wave analysis tool that can take into account all the aforementioned effects.

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