Slots in Dielectrically Loaded Waveguide

Larson, R. W.; Powers, Victor Michael

doi:10.1002/rds19661131

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…A shunt conductance in a transmission line can be utilized directly to present the long slot inside the planar surface of an air-filled rectangular waveguide [25]. For a filled rectangular waveguide, the single slot normalized resistance is calculated by [26]…”

Section: Single-element Designmentioning

confidence: 99%

5G dual-band slotted SIW array antenna

Kumawat

Joshi

2021

Journal of Taibah University for Science

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A dual-band slotted substrate-integrated waveguide four-element array antenna for the 5G communication system is presented in this manuscript. Two longitudinal slots are responsible for generating frequency bands of 28 and 38 GHz. The proposed antenna is designed on the substrate duroid 5880/Rogers having a loss tangent and dielectric constant of 0.003 and 2.2, respectively. The developed single-element design at 28 GHz provides 6.35 dBi gain, while at 38 GHz it provides 7.3 dBi gain and the simulation is carried out with CST Microwave Studio, 2018. To accomplish high gain, an optimized four-element array antenna is designed with a parallel feeding network on the same substrate that covers 28 . The designed antenna array attains the radiation efficiency of 88.08% with 12.7 dBi gain at 28 GHz and the efficiency of 84.44% with 15.5 dBi gain at 38 GHz band.

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Section: Single-element Designmentioning

confidence: 99%

5G dual-band slotted SIW array antenna

Kumawat

Joshi

2021

Journal of Taibah University for Science

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“…From HFSS simulations, the cut-off frequency of the SIW is about 42.8 GHz, a little higher than calculated. As a longitudinal slot in the broad face of an air-filled rectangular waveguide can be represented by a shunt conductance in an equivalent transmission line [12], Oliner's theory [13] can be directly used for the dielectric-filled rectangular waveguide to its calculate normalized resistance [14] by…”

Section: Design Proceduresmentioning

confidence: 99%

“…As a longitudinal slot in the broad face of an air‐filled rectangular waveguide can be represented by a shunt conductance in an equivalent transmission line , Oliner's theory can be directly used for the dielectric‐filled rectangular waveguide to its calculate normalized resistance by

\frac{R}{Z_{0}} = \frac{8 π a^{3} b}{3 λ^{3} λ_{normalg}} \cdot \frac{{true[1 - {true(\frac{2 a'}{λ_{normalg}} true)}^{2} true]}^{2} true[1 - 0.374 {true(\frac{a'}{λ} true)}^{2} + 0.130 {true(\frac{a'}{λ} true)}^{4} true]}{\sin^{2} true(\frac{π x}{a} true) \cos^{2} true(\frac{π a'}{λ_{normalg}} true)}

where λ is the free space wavelength, λ g is the guide wavelength, x is the offset of the slot from the center line of the rectangular waveguide,

a^{'}

is slot length, and a and b are the width and the length of the rectangular waveguide. In this design, the slot length is chosen to be approximately a half free space wavelength, that is,

a^{'} = 0.48 λ

.…”

Section: Design Proceduresmentioning

confidence: 99%

A Q-band high-gain substrate-integrated waveguide slot antenna

Xie

Belostotski

Okoniewski

2015

Microw. Opt. Technol. Lett.

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agreement between simulation and measurement is achieved while the reflection coefficient of the antennas is less than 28 dB in the 55-65-GHz band. Figures 12 and 13 show the radiation pattern of the fabricated antennas in the E-plane and H-plane. The rows of the metalized via holes placed around the edge of the substrate eliminate the existence of a half-mode SIW that could be a source of undesirable parasitic radiation. In this way, the Eplane radiation pattern of the proposed antennas has a lower ripple. The simulated H-plane radiation patterns are affected by the reflections from the metal block of the transition. In the case of the fabricated antennas, these reflections are suppressed using a high-frequency absorbing material and thus the transition has a very low influence on the radiation pattern. The measured Hplane radiation patterns are affected by an antenna positioner holder in the left half plane (elevation angle from 2170 to 210 ). The measured gain patterns of the antennas validate sufficiently the simulated ones. CONCLUSIONIn this letter, two SIW slot antennas have been proposed for the 60-GHz band. The antennas are characterized by low profile, compact size, low-cost fabrication, easy to design, and the ability to produce two different radiation patterns in the wide frequency band depending on the placement of the group of slots. On the basis of our research interest, the one-sided slot antenna is utilized for channel characterization of 60-GHz body centric communications and the double-sided slot antenna for experimental measurement of 60-GHz intravehicle signal propagation.A broadband, high-gain substrate-integrated waveguide (SIW) slot antenna fabricated on a PCB is presented in this article. Measured return loss reaches 25 dB at 45 GHz with the bandwidth of 4.72 GHz. The simulated gain is 9.6 dBi at 46.2 GHz and the efficiency is 96%. The measured gain is 7.8 dBi at 46.2 GHz. Good agreement is achieved between measured and simulated antenna patterns and return losses. It is shown that the antenna behavior can be enhanced by oversizing the bottom ground and properly selecting dimensions of top metal.

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“…It was first proposed by Larson et al [12] that filling the SWA with a dielectric material can reduce the waveguide size needed, increase the flexibility in slots location, reduce the slot length that allows spacing the shunt slots entirely in the narrow wall, and prevent electrical breakdown when working with high power microwaves. Larson used Babinet's principle to modify the equations of the radiation resistance, guide wavelength, slots conductance, and slot resonant length for dielectric-filled SWAs, previously presented by Elliott and Oliner in [7], [11].…”

Section: Introductionmentioning

confidence: 99%

Machine Learning-Aided Design of Dielectric-Filled Slotted Waveguide Antennas With Specified Sidelobe Levels

et al. 2022

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This paper presents the use of machine learning (ML) to facilitate the design of dielectric-filled Slotted Waveguide Antennas (SWAs) with specified sidelobe levels. Conventional design methods for air-filled SWAs require the simultaneous solving of complex equations to deduce the antenna's design parameters, which typically requires further manual simulation-based optimization to reach the desired resonance frequency and sidelobe level ratio (SLR). The few works that investigated the design of filled SWAs, did not optimize the design for a specified SLR. For an accelerated design process in the case of specified SLRs, we formulate the design of dielectric-filled SWAs as a regression problem where based on input specifications of the antenna's SLR, reflection coefficient, frequency of operation, and relative permittivity of the dielectric material, the developed ML model predicts the filled SWA's design parameters fast and with very low error. These parameters include the unified slots length and the non-uniform slots displacements required to achieve the desired performance. We experiment with several regressive ML algorithms and provide a comparative study of their results. Our numerical evaluations and validation experiments with the best performing ML models demonstrate the high efficiency of the proposed ML approach in estimating the dielectric-filled SWA's design parameters in only a few milliseconds. A comparison to the design obtained through conventional optimization using the Genetic Algorithm also indicate superiority in computation time and resulting antenna performance.

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Slots in Dielectrically Loaded Waveguide

Cited by 8 publications

References 3 publications

5G dual-band slotted SIW array antenna

5G dual-band slotted SIW array antenna

A Q-band high-gain substrate-integrated waveguide slot antenna

Machine Learning-Aided Design of Dielectric-Filled Slotted Waveguide Antennas With Specified Sidelobe Levels

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