A Tunable Ferrite Isolator for 30 GHz Millimeter-Wave Applications

Noferesti, Moein; Djerafi, Tarek

doi:10.1109/tmag.2021.3071684

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…It is well known that the transmission isolation of electromagnetic waves in the microwave field can usually be achieved using devices such as isolators [ 14 , 15 ] and circulators [ 16 ]. In the field of optics, many attempts have been made to achieve optical isolation by means of metamaterials [ 17 ] and photonic crystals [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Flexible Metamaterial Quarter-Wave Plate and Its Application in Blocking the Backward Reflection of Terahertz Waves

Sun¹,

Liu²,

et al. 2023

Nanomaterials

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A terahertz flexible metamaterial quarter-wave plate (QWP) is designed and fabricated using polyimide as the substrate in this paper, with a 3 dB axial ratio bandwidth of 0.51 THz and high polarization conversion efficiency and transmittance. The effect of the incidence angle on the polarization conversion performance of the QWP is discussed by measuring the transmissions at multiple incidence angles. The blocking effect of this QWP combined with a polarizer on the backward reflection of terahertz waves is investigated by terahertz time-domain spectral transmission experiments. By adjusting the angle of the QWP and polarizer with respect to the incident light in the optical path, a blocking efficiency of 20 dB can be achieved at a 20° incidence angle, with a bandwidth of 0.25 THz, a maximum blocking efficiency of 58 dB at 1.73 THz, and an insertion loss of only 1.4 dB. Flexible terahertz metamaterial QWPs and polarizers can effectively block harmful reflected waves in terahertz communication and other systems. They have the advantages of a simple structure, ultra-thinness and flexibility, easy integration, no external magnetic field, and no low-temperature and other environmental requirements, thus having broad application prospects for terahertz on-chip integrated systems.

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Section: Introductionmentioning

confidence: 99%

Flexible Metamaterial Quarter-Wave Plate and Its Application in Blocking the Backward Reflection of Terahertz Waves

Sun¹,

Liu²,

et al. 2023

Nanomaterials

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“…Ferrite isolators of different topologies have been discussed in several studies. [2][3][4][5][6][7][8][9][10][11] Ferrite-based isolators and phase shifters are used in high-power applications like phased array radars to attenuate the power getting back to the source and to achieve progressive phase difference between the elements, respectively. Some ferrite phase shifters have been discussed in several studies.…”

Section: Introductionmentioning

confidence: 99%

“…Especially barium hexaferrite (BHF) can be used in making these devices due to its specific properties, 1 such as good anisotropy, lower conductivity, high‐temperature tolerance, material hardness (after annealing), greater coercivity, and so forth. Ferrite isolators of different topologies have been discussed in several studies 2–11 …”

Section: Introductionmentioning

confidence: 99%

Microstrip‐line‐based K‐band isolator and Ku‐band phase shifter with barium hexa ferrite disc

Akkapanthula,

Kagita,

Voma

2023

Micro & Optical Tech Letters

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This article deals with the operational behavior of barium hexaferrite (BHF) disc when incorporated in microwave substrates for wireless applications. A microstrip line printed on a Rogers substrate (35 mm × 35 mm × 1.6 mm) has been used in the design to observe the effect of BHF material. A BHF circular‐shaped disc of radius 4.5 mm and thickness 1 mm is inserted in the middle of the microstrip line. The ferrite is biased using miniature lightweight neodymium magnets stacked one over the other to obtain desired magnetic field strength. The proposed microstrip line inserted with a BHF disc exhibits wide band isolation properties in the K‐band (15–21 GHz) with an average isolation of 20 dB and peak isolation of 51 dB centered at 18.5 GHz. It is observed that the same circuit is behaving as a phase shifter showing a 45° ± 3° phase shift in the band ranging from 12 to 14 GHz. The proposed compact microstrip‐line circuit can be used as both ferrite phase shifter and isolator in consecutive bands (Ku‐ and K‐bands) with ease of integration and biasing.

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Scalable Galvanic Isolators with High Isolation Realized by Magnetoelectric Gyrators

Zhang

et al. 2022

J. Electron. Mater.

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A Tunable Ferrite Isolator for 30 GHz Millimeter-Wave Applications

Cited by 12 publications

References 22 publications

Flexible Metamaterial Quarter-Wave Plate and Its Application in Blocking the Backward Reflection of Terahertz Waves

Flexible Metamaterial Quarter-Wave Plate and Its Application in Blocking the Backward Reflection of Terahertz Waves

Microstrip‐line‐based K‐band isolator and Ku‐band phase shifter with barium hexa ferrite disc

Scalable Galvanic Isolators with High Isolation Realized by Magnetoelectric Gyrators

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