Synthesis of cosecant-squared pattern in substrate integrated waveguide leaky-wave antennas

Heidari, Farnoosh; Adelpour, Zahra; Mallahzadeh, Alireza; Parhizgar, Naser

doi:10.1016/j.aeue.2021.153679

Cited by 4 publications

(5 citation statements)

References 32 publications

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“…However, as also stated in ref. [28], this technique normally needs further numerical optimization to reduce the ripple and sidelobe levels. In any case, this is out of the scope of the present work, which is focused on the synthesis of flat‐topped radiation patterns following pure Butterworth and Chebyshev type I angular responses.…”

Section: Resultsmentioning

confidence: 99%

“…This two-step technique has also been proposed in ref. [28] for the synthesis of cosecant-squared patterns using a single modulated LWA. Our initial results show that this method can similarly be applied for an array of LWAs, obtaining better performance using Chebyshev Type I polynomials than with Butterworth prototypes.…”

Section: Comparative Designmentioning

confidence: 99%

Section: Comparative Designmentioning

confidence: 99%

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Design of Wide‐Beam Leaky‐Wave Antenna Arrays Based on the Bilinear Transformation of IIR Digital Filters and the Z Transform

Verdú‐Monedero,

Gómez‐Tornero,

Morales‐Sánchez

2023

Advcd Theory and Sims

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In the pioneering work, the radiation diagrams of leaky wave antenna arrays can achieve attenuation nulls and gains at specific angles by manually placing the zeros and the poles in the Z domain of the corresponding discrete linear time‐invariant (LTI) system. This handcrafted design procedure does not allow radiation diagrams with wide beams since the interaction between poles involved in the wide beam and their corresponding leaky modes cannot be easily handled. To overcome this limitation, this paper describes a novel method for designing radiation diagrams of leaky‐wave antenna arrays based on the theory of IIR discrete filters. The proposed method relies on the design of discrete filters with the prototypes of analog low‐pass filters defined by Butterworth and Chebyshev type I polynomials, whose roots along with the bilinear transformation provide the location of the poles and the zeros of the discrete LTI system and, therefore, the parameters of the leaky‐wave antenna array. Results with different designs and a comparison with other approaches show the utility and effectiveness of this novel method to design wide‐beam leaky‐wave antenna arrays.

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Section: Resultsmentioning

confidence: 99%

Section: Comparative Designmentioning

confidence: 99%

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Design of Wide‐Beam Leaky‐Wave Antenna Arrays Based on the Bilinear Transformation of IIR Digital Filters and the Z Transform

Verdú‐Monedero,

Gómez‐Tornero,

Morales‐Sánchez

2023

Advcd Theory and Sims

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“…In this paper, taking inspiration from Khaefi et al 23,24 and overcoming all these various drawbacks and limitations, a novel periodic slot array LWA based on

N

segments is proposed for full‐space beamforming (i.e., backward, forward, and broadside) compatible with SIW technology. The proposed LWA is based on double transverse slots whose relative arrangements serve to suppress the broadside stopband in each segment and provide a longitudinally polarized radiation.…”

Section: Introductionmentioning

confidence: 99%

“…Flat‐top pattern synthesis using segmented optical grating waveguide LWAs was proposed in Khaefi et al, 23 however it was only demonstrated for backward radiation without possibility for broadside radiation due to the unmitigated stopband. Another segmented SIW LWA based on longitudinal slots was proposed to achieve a cosecant‐squared patterns, 24 however it lacks broadside radiation due to the stopband. Similarly, a double‐layer vertical stacked SIW LWA was proposed for flat‐top beams in Monavar et al, 25 but the design also lacks broadside radiation due to the stopband.…”

Section: Introductionmentioning

confidence: 99%

A segmented periodic slot array leaky‐wave antenna for beamforming applications

Emara,

Gupta

2024

Micro & Optical Tech Letters

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A segmented periodic slot array leaky‐wave antenna (LWA) is proposed for beamforming applications. The LWA consists of segments, each with a unique propagation constant achieved through varying periodicity and slot size. By using segments with different propagation constants, the proposed LWA can achieve beamforming such as flat‐top beams and side‐lobe level (SLL) reduction. The LWA is based on a substrate‐integrated waveguide with periodic double transverse slots in the broad wall of the waveguide. The double slots allow for reflection‐canceling to suppress the broadside stopband and hence can achieve beamforming capabilities in the backward, broadside, and forward directions. Full‐wave simulations are used to demonstrate the proposed concept for flat‐top beamforming in the mm‐wave band at 30 GHz. Experimental demonstration is conducted using two prototypes for flat‐top beams and SLL reduction, with good agreement with full‐wave simulations.

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