Lumped-Element and Leaky-Wave Antennas for Millimeter Waves

Oliner, A.A.

doi:10.21236/ada165280

Cited by 2 publications

(5 citation statements)

References 7 publications

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“…On the other hand, the arbitrary aperture illumination control requires a precise control of the leakage factor along y. From [1], a well-known LWA approximate expression can be used to obtain the leakage factor required to synthesize a given aperture field distribution:…”

Section: Design Methodologymentioning

confidence: 99%

“…where η rad is the required radiation efficiency which, if chosen very high, could invalidate the SVAA approach due to a more rapidly varying α(y). The phase constants above and under the metasurface are related to the LWA pointing angle θ out and the angle of incidence inside the waveguide θ in , respectively [1], by:…”

Section: Design Methodologymentioning

confidence: 99%

“…Planar Leaky-Wave Antennas (LWAs) are a promising alternative for new communication systems with requirements such as low profile, reduced cost and high directivity. They are travelling-wave structures that gradually leak power along its length [1], which facilitates simple feeding networks, reducing complexity with respect to phased arrays. LWAs are characterized by their wavenumber k, composed of a phase constant β and a leakage factor α, which control the output angle and the rate of the radiation, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Physical Implementation of Leaky-Wave Antenna with Engineered Aperture Distribution Based on Bianisotropic Huygens Metasurfaces

Mateos-Ruíz¹,

Killamsetty

Epstein

et al. 2023

2023 17th European Conference on Antennas and Propagation (EuCAP)

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A methodology based on omega-type bianisotropic Huygens' metasurfaces is presented to control the aperture field distribution of leaky-wave antennas. The studied structure is a parallel-plate waveguide with the top plate replaced by a metasurface. Previous works achieved independent control of the phase constant and the leakage factor, but they were constrained to be constant. The required theoretical extensions to overcome this limitation are presented in this work, thus enabling the design of arbitrary radiation patterns. A slowly varying amplitude approximation approach is employed to satisfy Maxwell's wave equation and obtain the relation between the horizontal and vertical wavenumbers. In addition, a semianalytical algorithm able to predict near-field coupling effects is applied in the microscopic design of the metasurface unit cells. Two designs are carried out with real unit cells, presenting different aperture configurations. Finally, electromagnetic simulations validate the methodology with an excellent agreement without any further full-wave optimization.

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Section: Design Methodologymentioning

confidence: 99%

Section: Design Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical Implementation of Leaky-Wave Antenna with Engineered Aperture Distribution Based on Bianisotropic Huygens Metasurfaces

Mateos-Ruíz¹,

Killamsetty

Epstein

et al. 2023

2023 17th European Conference on Antennas and Propagation (EuCAP)

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show abstract

“…ki   in the guiding structure, exponentially decaying while propagating. The subject of LWs has been largely studied in the past, including their role in producing narrow beam radiation [4][5][6][7], and the reader is addressed to [8] for a review on recent developments on LWs.…”

Section: Lw Lwmentioning

confidence: 99%

“…Equations (4) and (8) are valid for x between /2 Nd  and /2 Nd , where the two waves are leaky. Each LW will provide far field beams that depend on the leaky wave wavenumber LW k , as well as on the resonator parameter FPR f (large at the resonance), which can be used for modulating the magnitude of the far field.…”

Section: Control Of Radiation Of An Olwa Integrated Into a Fabry-peromentioning

confidence: 99%

Enhancing radiation control of an optical leaky wave antenna in a resonator

et al. 2012

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We analyze the theoretical and physical properties of a CMOS compatible optical leaky wave antenna (OLWA) integrated into a Fabry-Pérot resonator (FPR) at 193.4 THz (wavelength 0  = 1550 nm). The presented OLWA design is composed of a silicon (Si) dielectric waveguide sandwiched between two silica glass (SiO 2) domains, and it comprises periodic perturbations (cavities of vacuum). We first describe the radiation of the isolated OLWA whose radiation pattern is due to the excitation of a leaky wave, slowly decaying while traveling. The perturbations are indeed designed to obtain a leaky wave harmonic with very low attenuation and phase constants. Then, we integrate the same OLWA into a FPR where two leaky waves with the same wavenumber are travelling in opposite directions inside the resonator. We show that the radiation level at the broadside direction can be effectively controlled by modifying the optical properties of the Si waveguide through electron-hole excess carrier generation (found to be highly enhanced when it is integrated into a FPR). The design of the integrated OLWA is properly set to guarantee the constructive interference of the two radiated beams provided by the two leaky waves in the FPR. The modal propagation constant in the integrated OLWA can be then altered through excess carrier generation in Si, thus the antenna can be tuned in and out of the resonance thanks to the high FPR quality factor, and the LW modal dispersion relation. This allows for enhanced radiation level control at broadside, and preliminary results show up to 13 dB beam modulation.

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Lumped-Element and Leaky-Wave Antennas for Millimeter Waves

Cited by 2 publications

References 7 publications

Physical Implementation of Leaky-Wave Antenna with Engineered Aperture Distribution Based on Bianisotropic Huygens Metasurfaces

Physical Implementation of Leaky-Wave Antenna with Engineered Aperture Distribution Based on Bianisotropic Huygens Metasurfaces

Enhancing radiation control of an optical leaky wave antenna in a resonator

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