Reconfigurable Antennas and Their Applications

Costantine, J.; Tawk, Y.; Christodoulou, C.G.

doi:10.1007/978-981-4560-75-7_61-1

Cited by 7 publications

(4 citation statements)

References 100 publications

(148 reference statements)

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“…The reconfigurability of antenna properties has attracted the attention of researchers in the field of wireless communications, especially in mobile and satellite applications (Haider et al 2013;Priya 2020;Ojaroudi Parchin et al 2020;Costantine et al 2014). The most popular antenna parameters that can be reconfigured are the operating frequencies, radiation pattern, and polarization (Shakhirul et al 2018), (Costantine et al 2015).…”

Section: Introductionmentioning

confidence: 99%

High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

2023

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This paper suggestsproposes a high-gain reconfigurable polarization antenna using a metasurface polarizaer. The metasurface polarizer is a rectangular array that consists of similar 25 unit-cell elements. Each metamaterial (MM) unit-cell element consists of a circular copper patch attached to two copper arrow-shaped strips installed at its circumference. The circular patch and two arrows are installed between a rectangular superstrate at the top and a rectangular substrate at the bottom, which is backed with a perfect electric conductor with a relative permittivity of εsub = 3.38. The MM characteristics are obtained in a wide range of frequencies from 1.4 to 2.1 THz. The metasurface polarizer array is installed at an optimized height of 25 μm under a linear polarized dipole antenna that operates at 1.81 THz with a bandwidth (BW) of 0.2 THz from 1.75 to 1.95 THz (11.05%, − 10 dB BW) and gain of 2.27 dBi. The incident-plane wave from the antenna can be converted into a reconfigurable left- or right-hand circular polarization according to the directions of the arrow of the MM unit-cell element. Moreover, the operating − 10-dB BW of the dipole antenna increases to 30.93%, and the gain is enhanced to 6.18 dBi at the same operating frequency. A reconfigurable polarization conversion for the dipole antenna can be obtained over wide 3-dB axial ratio BW from 1.45 to 1.95 THz (33.3% BW).

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Section: Introductionmentioning

confidence: 99%

High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

2023

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“…Although the highest mechanical properties, graphene material has impressive flexibility [6]. Reconfigurability of the antenna's properties has attracted the attention of researchers in the field of wireless communications, especially mobile and satellite [7][8][9][10]. The most popular antenna properties that can be reconfigurable are the operating frequencies, the radiation pattern, and the polarization [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Graphene-Based Metamaterial Polarization Converter for Terahertz Applications

Mabrouk

Donkol

Seliem

2022

Preprint

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This paper suggests a high gain polarization converter using a graphene-based metamaterial array. The graphene-based metamaterial polarization converter is a rectangular array that consists of 20 periodic unit-cell elements. Each graphene-based metamaterial unit-cell element consists of a rectangular patch with four triangular-shaped graphene parts at its four corners. The rectangular patch with the four graphene parts are placed over a rectangular substrate backed with a perfect electric conductor (PEC) and has a relative permittivity of εsub = 3.38. The metamaterial characteristics of the proposed graphene-based metamaterial unit-cell element are obtained over a wide range of frequencies of 0.7 THz ranging from 1.5 THz to 2.2 THz. The graphene-based metamaterial array is placed over a linear polarized slot antenna that operates at 1.8 THz with a maximum gain of 5.5 dBi. The linearly polarized wave that radiated from the slot antenna can be converted into a reconfigurable right-handed circular polarization (RHCP) or Left-handed circular polarization (LHCP) according to the biasing states of the graphene parts. Moreover, the operating -10 dB B.W of the slot antenna is increased to 22.2%, and the gain is enhanced to 8 dBi at the same operating frequency. A reconfigurable polarization conversion for the slot antenna can be obtained over a wide 3dB axial ratio (AR) B.W from 1.75 THz to 1.92 THz (20% 3dB B. W).

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“…This change is gained through many techniques that redistribute the antenna currents and thus alter the electromagnetic fields of the antenna's effective aperture. Frequency reconfiguration techniques are based on the use of switches to connect and disconnect antenna parts as well as to redistribute the antenna currents [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Frequency Reconfigurable Antenna for Sub-GHz and TV White Space Applications

Kumar¹,

Khandekar²,

Rayavarapu³

2021

Lecture Notes in Electrical Engineering

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TV White Space (TVWS) band of frequencies are those rendered surplus after conversion of analog TV transmission to digital. The proposed antenna is a meander line antenna (MLA), with a defect ground structure designed for TVWS band viz 470-890 MHz. The antenna has dimensions of 108 × 44 mm 2 printed on FR-4 epoxy substrate with dielectric constant of ε r = 4.4 achieving size reduction upto 35%. Frequency is switched electronically, using four RF-PIN diodes, mounted in the slots on the ground plane. The simulated resonant frequencies obtained for the different PIN diode biasing combinations are 0.840, 0.660, 0.8560, 0.6460, 0.8700, and 0.828 GHz. The simulated return loss values are well below −10 dB. The measured results of the printed antenna closely follow the simulated ones.

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Reconfigurable Antennas and Their Applications

Cited by 7 publications

References 100 publications

High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

Reconfigurable Graphene-Based Metamaterial Polarization Converter for Terahertz Applications

A Frequency Reconfigurable Antenna for Sub-GHz and TV White Space Applications

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