2-D Beam Scanning With Cylindrical-Leaky-Wave-Enhanced Phased Arrays

Comite, Davide; Burghignoli, Paolo; Baccarelli, Paolo; Galli, Alessandro

doi:10.1109/tap.2019.2902678

Cited by 32 publications

(40 citation statements)

References 47 publications

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“…Over the last few decades, different solutions based on LWAs have been proposed to design high-gain beam scanning over the three-dimensional (3-D) space. This can be achieved by arranging LW line-source antennas into linear arrays, therefore including phase shifters in only one dimension [5]- [8], or by embedding a reduced number of sources within a Fabry-Perot cavity antenna (FPCA) [9].…”

Section: Introductionmentioning

confidence: 99%

“…Content may change prior to final publication. More recently, in [9], some of the present authors investigated the advantages achievable by exploiting a directional element radiation pattern obtained embedding an array inside a planar FPCA. The work demonstrated the possibility of achieving a high-gain pencil-beam scanning both in azimuth and elevation by properly phasing the array of the azimuthally invariant sources and changing the frequency, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Such an uncommon feature was enabled by the excitation of a dominant cylindrical TM LW of 0−th azimuthal order [30]. The structure in [9] was bounded on top by a homogenized partially reflecting surface, representing one of the key aspects of the approach. Its subwavelength and translational invariant nature, indeed, permits to freely select the sources position and spacing within the cavity, as well as to perform the dispersive analysis by means of the definition of an equivalent transverse network (see [31] and refs.…”

Section: Introductionmentioning

confidence: 99%

“…This is achieved with a structure having thickness in the order of half a wavelength, which requires the use of spacers or the design of stacks of multilayer dielectric laminates, preventing thus the use of conventional PCB approaches for a complete integrability with other circuitry. Nonetheless, FPCA antennas fed by azimuthally symmetric sources can suffer the undesired excitation of a quasi-TEM mode [31], which unavoidably degrades the radiation efficiency and, if its radiation regime is not properly suppressed, determines the presence of a spurious lobe close to endfire [9], [32].…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these limitations and to provide 2-D steering capabilities with a compact structure based on conventional single-layer PCB technology, we propose here the design of a 2-D radially periodic LWA fed by a circular arrangement of vertical coaxial probes (see Figs. 1(a), (b) and 2), whose radial distance, size, and position is optimized to excite an angularly directional surface wave (SW) around the main direction dictated by the corresponding source of the multiport system, which, as opposed to the phased-array in [9], are activated therefore one at time defining a multi-port antenna. The presence of a periodic perturbation determined by the metallic annular grating allows for transforming the directional SW into a LW, which, if properly designed, still represents the dominant contribution to the directional aperture field supported by the structure, and whose radiation can be described by a single fast backward spatial harmonic.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Directive 2-D Beam Steering by Means of a Multiport Radially Periodic Leaky-Wave Antenna

Comite

Kuznetcov

Buendía

et al. 2021

IEEE Trans. Antennas Propagat.

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A multi-fed radially periodic two-dimensional leakywave antenna is proposed for the generation of a directional beam continuously scanning in elevation by changing the frequency, and over a discrete number of directions in azimuth when activating different elements of the feeding system. The structure is planar and constituted by a circular grounded dielectric slab loaded with microstrip rings, properly positioned around the sources to support the propagation of an angularly directional surface wave over a sector determined by the corresponding activated feeder. This produces a perturbation of the surface wave, resulting in the generation of a directional leaky wave over the aperture, whose complex propagation constant is described by a single fast backward spatial harmonic. The antenna radiation features are numerically investigated in conjunction with the dispersion analysis of the structure, validated through a conventional generalizedpencil-of-function approach. Full-wave simulations have been developed to design a practical feeder, which is constituted by a circular arrangement of commercial coaxial connectors. The proposed multi-port antenna is validated by means of measurements performed on a microwave manufactured prototype. The design represents an attractive simple and cost-effective solution to achieve a high-gain beam scanning over the threedimensional space, alternative to more conventional phased-array design based on cumbersome and lossy feeding networks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Directive 2-D Beam Steering by Means of a Multiport Radially Periodic Leaky-Wave Antenna

Comite

Kuznetcov

Buendía

et al. 2021

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

show abstract

Parallel‐plates‐based Dirac Leaky Wave Antennas

Rezaee

Memarian

Ahmadian

2021

IET Microwaves Antenna & Prop

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In this work, the authors experimentally show Dirac Leaky Wave Antennas (DLWAs) at upper microwave frequencies. For the first time, DLWAs are implemented using simple Parallel plate waveguide (PPW) technology, while yielding desirable radiation features and continuous beam scanning through broadside, as well as extremely low profile, with significant ease of fabrication, making them well suited for Ku band applications such as satellite communication, radar and emerging fifth‐generation (5G). A planar Dirac photonic crystal in PPW is shown with a closed bandgap and linear dispersion around broadside. In this work, 1D and 2D PPDLWAs are designed that provide scannable fan and pencil beams, respectively, with a symmetric beamwidth. Phase and attenuation constants are controlled with unit cell dimensions to obtain a directive beam and scanning in a wide range of angles. For the 2D design, an appropriate wideband feeding network is designed that excites the antenna appropriately. The presented PPDLWAs operate with a peak gain of about 13 dB for the fan beam and 22 dB for the pencil beam, in the frequency range from 12 to 16 GHz.

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High‐gain ultra‐wideband quasi‐conical beam Fabry‐Perot antenna based on beam switching

Yang

et al. 2022

IET Microwaves Antenna & Prop

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To solve the contradiction between the high gain and wide coverage, the concept of the quasi‐conical beam is proposed by using the high‐gain pencil beam electrically switching along a cone to make full use of time redundancy. In a periphery‐fed Fabry‐Perot (FP)‐type multi‐beam antenna, the electrically switching is used to activate the different port corresponding to the different beam for the beam switching in the azimuthal plane, and the varying frequency is used for the continuous scanning in the elevation plane. Different from the lens or matrix multi‐beam arrays, in this scheme, the FP cavity serves as both the beamforming network and the radiator to produce the multi‐beam. Around eight planar antipodal Fermi‐tapered slot antennas are placed around the FP cavity between the partially reflective surface and the metal ground plane as the primary feeds. The simulation and measurement results show that a relative impedance bandwidth of 53.3% with reflection coefficients below −10 dB from 11 to 19 GHz is obtained and the peak gain is 17.1 dBi at the central frequency of 15 GHz. The results also show that a high‐gain beam scanning from 22° to 59° in the elevation plane is achieved and the peak gains are between 16 dBi and 20 dBi. In addition, when the electrically switching of the beam is along a cone, the proposed antenna may form quasi‐conical beam. And in some applications, it may replace the conventional conical beam antenna with the advantages of wide coverage and high gain.

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2-D Beam Scanning With Cylindrical-Leaky-Wave-Enhanced Phased Arrays

Cited by 32 publications

References 47 publications

Directive 2-D Beam Steering by Means of a Multiport Radially Periodic Leaky-Wave Antenna

Directive 2-D Beam Steering by Means of a Multiport Radially Periodic Leaky-Wave Antenna

Parallel‐plates‐based Dirac Leaky Wave Antennas

High‐gain ultra‐wideband quasi‐conical beam Fabry‐Perot antenna based on beam switching

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