Side lobe level reduction and gain enhancement of a pyramidal horn antenna in the presence of metasurfaces

Moradi, Anis; Mohajeri, Farzad

doi:10.1049/iet-map.2017.0376

Cited by 17 publications

(8 citation statements)

References 22 publications

(20 reference statements)

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“…Electromagnetic surface waves (SWs) of various kinds are attracting considerable attention owing to their potential for many applications from telecommunication to plasmonics [1][2][3][4]. Importantly, these emerging technologies have also been recently studied as backhaul solutions to the network standard 5G [5,6].…”

Section: Introductionmentioning

confidence: 99%

Interaction between surface waves on wire lines

et al. 2021

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This paper investigates coupling between electromagnetic surface waves on parallel wires. Finite-element method (FEM)-based and analytic models are developed for single- and double-wire Sommerfeld and Goubau lines. Models are validated via measurements for Goubau lines and a comparison between the analytic and the FEM-based computations for coupled Sommerfeld- and Goubau-type lines is carried out. The measurements and calculations show remarkable agreement. The FEM-based and analytic models match remarkably well too. The results exhibit new favourable effects for surface waves propagation over multiple conductors. The short-range behaviour of the coupled wires and, consequently, the existence of an optimum separation of coupled wires is one of the most significant findings of this paper. We comment on the relevance of our results, particularly in relation to applications of high bandwidth demands and cross-coupling effects.

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Section: Introductionmentioning

confidence: 99%

Interaction between surface waves on wire lines

et al. 2021

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“…To achieve an effective relative permittivity coefficient less than one, the metamaterial structure consists of an array of metal thin-wire [1][2][3] whereas an array of a metal split-ring resonator results in an effective relative permeability coefficient smaller than one [1][2][3][4]. Metamaterials have many applications, for example, improving the radiation characteristics of microstrip antennas by covering an array of metamaterial cells in front of a microstrip antenna [5], side lobe level (SLL) reduction of antennas that are used as high surface impedances adjacent to the interior walls of a pyramidal horn antenna [6], gain enhancement in horn antennas [7][8][9] and so on. Also, the structures with superstrate configuration have been proposed as a lens [10].…”

Section: Introductionmentioning

confidence: 99%

Size reduction of a conical horn antenna loaded by multi‐layer metamaterial lens

Sedaghat

Mohajeri

2022

IET Microwaves Antenna & Prop

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In this paper, a conical horn antenna in the presence of a metamaterial lens in the X‐band is introduced and fabricated. The annular metamaterial lens is located at the aperture of a shortened horn antenna, whose length is half the length of the corresponding optimum horn. The phase velocity in the metamaterial lens is more than the phase velocity along the axis of the antenna for the same propagation distance, so the phase distribution at the aperture of the antenna is uniform and the gain of the shortened horn antenna increases. Metamaterial cells are designed in the form of a printed circuit board that have easy to build and suitable cost. The design process is based on how the waves incident on the proposed metamaterial cell, and finally, by using the particle swarm optimisation (PSO) algorithm proper radiation characteristics in the desired frequency range can be achieved. The radiation characteristics of an antenna with a metamaterial lens are similar to that of an antenna with optimum length in the desired frequency band. The difference is that the weight and volume of these antennas are reduced, so they have better performance in satellite and radar systems.

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“…However, the sidelobe level is an essential specification of satellite antenna arrays, as it characterizes the capability of arrays to suppress the interference. In order to realize low sidelobes while maintaining high power efficiency, PAs can be intentionally arranged to operate in different saturation modes with desired power levels [18][19][20][21][22]. However, it is infeasible to directly apply the existing DPD methods designed for signal PA or uniform power antenna arrays to linearize low-sidelobe active antenna arrays with non uniform power distribution [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

A Cross-Mode Universal Digital Pre-Distortion Technology for Low-Sidelobe Active Antenna Arrays in 5G and Satellite Communications

Huang

Nielsen

et al. 2021

Electronics

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A cross-mode universal digital pre-distortion (CMUDPD) technology is proposed here to linearize low-sidelobe active antenna arrays with non-uniform fixed power levels for each branch, which are desired in satellite communications with stringent requirements to minimize interference. In low-sidelobe arrays formed by nonuniform amplitude excitation, conventional digital pre-distortion (DPD) techniques require multiple feedback paths for either one-to-one or average linearization of the PAs, which increases system complexity and is infeasible for large-scale arrays. This is because the power amplifiers (PAs) usually operate in different modes where the supply voltages, bias voltages, and input power levels are different. The proposed CMUDPD method aims at solving this issue by intentionally arranging the PAs to work in different modes but with shared nonlinear characteristics. Based on the nonlinear correlation established among the PAs’ different operating modes, a single feedback path is sufficient to capture the common nonlinearity of all the PAs and determine the parameters of the CMUDPD module. The concept is explained in theory and validated by simulations and experiments using GaN PAs operating with three significantly different output power levels and two orthogonal frequency division multiplexing (OFDM) signal bandwidths.

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Side lobe level reduction and gain enhancement of a pyramidal horn antenna in the presence of metasurfaces

Cited by 17 publications

References 22 publications

Interaction between surface waves on wire lines

Interaction between surface waves on wire lines

Size reduction of a conical horn antenna loaded by multi‐layer metamaterial lens

A Cross-Mode Universal Digital Pre-Distortion Technology for Low-Sidelobe Active Antenna Arrays in 5G and Satellite Communications

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