Printed-circuit leaky-wave antenna with pointing and illumination flexibility

Gómez‐Tornero, José Luis; Casamichana, David; Álvarez‐Melcón, A.

doi:10.1109/lmwc.2005.852801

Cited by 23 publications

(8 citation statements)

References 9 publications

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“…As reported in previous studies [84], [92], [101], [102], these two leaky modes couple when β and α of both modes have similar values, producing the exoticlooking dispersion curves shown in Fig. 3.9, where it is observed an interchange The parallel-plate strip region of width W 0 serves to eliminate the vertical component of higher-order electric fields, allowing the radiated beam to possess purer horizontal polarization and thus a higher cross-polarization discrimination (XPD) as W 0 is increased, as it is shown in Fig.…”

Section: Fig 37)supporting

confidence: 75%

“…A standing-wave periodic behavior is expected as W 0 is varied, as it happens in previous stub-loaded LWAs [84], [92], [101], [102] in which a section of parallelplate guide makes the transition from the leaky waveguide to the radiating openend. However, higher-order channel-guide leaky-modes resonating in this width of parallel-plate will appear as W 0 is increased, as reported in [84], [92], [101], [102]. This is illustrated in Fig.…”

Section: Effect Of Radiating Strip Width Wmentioning

confidence: 63%

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Analysis and synthesis of leaky-wave devices in planar technology

Ros¹,

Javier²

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List of Figures 4.22 Theoretical, simulated and measured radiation patterns at the design frequency of 15 GHz for the conventional rectilinear HMLWA. 4.23 Theoretical, simulated and measured radiation patterns at the design frequency of 15 GHz for the conformal non-tapered HMLWA. 4.24 Theoretical, simulated and measured radiation patterns at the design frequency of 15 GHz for the conformal tapered HMLWA.. . 4.25 Theoretical, simulated and measured radiation patterns at the design frequency of 15 GHz for the conformal tapered SIW LWA.. .

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Section: Fig 37)supporting

confidence: 75%

Section: Effect Of Radiating Strip Width Wmentioning

confidence: 63%

Analysis and synthesis of leaky-wave devices in planar technology

Ros¹,

Javier²

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“…, where is the propagation constant of the free-space) and are not over-moded, and they have a direct feeding circuit without the need of creating CRLH TL [70]- [72]. They can also operate in both in only-forwardscanning (uniform) or periodic configuration (for backward-to-forward scanning).…”

Section: B-1) Backfire-to-endfire Lwamentioning

confidence: 99%

A Comprehensive Survey of “Metamaterial Transmission-Line Based Antennas: Design, Challenges, and Applications”

et al. 2020

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In this review paper, a comprehensive study on the concept, theory, and applications of composite right/left-handed transmission lines (CRLH-TLs) by considering their use in antenna system designs have been provided. It is shown that CRLH-TLs with negative permittivity and negative permeability have unique properties that do not occur naturally. Therefore, they are referred to as artificial structures called "metamaterials". These artificial structures include series left-handed (LH) capacitances , shunt LH inductances , series right-handed (RH) inductances , and shunt RH capacitances that are realized by slots or interdigital capacitors, stubs or via-holes, unwanted current flowing on the surface, and gap distance between the surface and ground-plane, respectively. In the most cases, it is also shown that structures based on CRLH metamaterial-TLs are superior than their conventional alternatives, since they have smaller dimensions, lower-profile, wider bandwidth, better radiation patterns, higher gain and efficiency, which make them easier and more cost-effective to manufacture and mass produce. Hence, a broad range of metamaterial-based design possibilities are introduced to highlight the improvement of the performance parameters that are rare and not often discussed in available literature. Therefore, this survey provides a wide overview of key early-stage concepts of metematerial-based designs as a thorough reference for specialist antennas and microwave circuits designers. To analyze the critical features of metamaterial theory and concept, several examples are used. Comparisons on the basis of physical size, bandwidth, materials, gain, efficiency, and radiation patterns are made for all the examples that are based on CRLH metamaterial-TLs. As revealed in all the metematerial design examples, footprint area decrement is an important issue of study that have a strong impact for the enlargement of the next generation wireless communication systems.

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“…For instance, a simultaneous tapering of the leaky-wave leakage rate and pointing angle along the leaky radiator was used to synthesize radiation beams [13]. Cosine-tapered designs were performed to reduce sidelobe levels and tune the pointing direction over a wide range [14]. Recently, an array of non-uniform SinMRSs with application to near-field focused leaky-wave radiation in the backward Fresnel zone were proposed [15].…”

Section: Introductionmentioning

confidence: 99%

A Dual-Beam Leaky-Wave Antenna Based on Squarely Modulated Reactance Surface

Zhang

Ding

et al. 2020

Applied Sciences

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In this paper, a novel dual-beam leaky-wave antenna (LWA) based on squarely modulated reactance surface (SquMRS) is proposed. The equivalent transmission lines model is utilized to characterize the field distributions of surface wave guided by the SquMRS. The calculated dispersion characteristics of SquMRS are verified by the simulated results, and it is demonstrated that SquMRS exhibits a more flexible control of phase constant and attenuation constant compared with traditional sinusoidally modulated reactance surface (SinMRS), which means SquMRS has a great potential for near-field focusing and far-field beam shaping. On this basis, a versatile method, based on a superposition of individual modulation patterns, was used to generated two beams with almost identical gain at 8.5 GHz. The measured results show that the gains are 10 dBi and 8.2 dBi at θ1 = −30° and θ2 = 18°, respectively, and the radiation efficiency is 83%, which shows good agreement with the simulated results.

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Printed-circuit leaky-wave antenna with pointing and illumination flexibility

Cited by 23 publications

References 9 publications

Analysis and synthesis of leaky-wave devices in planar technology

Analysis and synthesis of leaky-wave devices in planar technology

A Comprehensive Survey of “Metamaterial Transmission-Line Based Antennas: Design, Challenges, and Applications”

A Dual-Beam Leaky-Wave Antenna Based on Squarely Modulated Reactance Surface

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