A Low-Loss Edge-Mode Isolator With Improved Bandwidth for Cryogenic Operation

Zeng, Lingzhen; Tong, Edward; Blundell, R.; Grimes, Paul K.; Paine, Scott

doi:10.1109/tmtt.2018.2799574

Cited by 15 publications

(18 citation statements)

References 15 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

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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“…We have previously reported an optimized edge-mode isolator [13] for cryogenic operations, which features a refined circuit geometry with a robust mechanical layout. This isolator demonstrates a low insertion loss of less than 1 dB, with excellent impedance matching from 4 to 22 GHz, and notable isolation below 13 GHz.…”

Section: Introductionmentioning

confidence: 99%

A Low-Insertion Loss Cryogenic Edge-Mode Isolator With 18 GHz Bandwidth

Zeng,

Tong,

Paine

2023

IEEE J. Microw.

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Cryogenic isolators play an important role in low-noise receiver systems widely employed in millimeter and submillimeter telescopes. To enable a significantly wider Intermediate Frequency (IF) bandwidth, there is strong demand for a wideband, low-loss isolator in modern facilities like the Submillimeter Array (SMA) and Atacama Large Millimeter/submillimeter Array (ALMA). In this article, we present a novel cryogenic edge-mode isolator that incorporates an innovative circuit design. Operating at a cryogenic temperature of 4 K, this isolator delivers unprecedented performance, covering a frequency range from 4 GHz to 22 GHz. It exhibits insertion loss of less than 1 dB, together with return loss below -15 dB. In particular, it provides an isolation better than 17 dB across most of the band, a significant improvement over the previous generation of edge-mode isolators. This new isolator design is suitable for a wide array of low-noise receiver applications, from radio-astronomy to quantum computing.INDEX TERMS Calcium vanadium, ferrite devices, isolators, millimeter wave and terahertz components, quantum computing, radio astronomy, YIG.

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“…Non-reciprocal components are essential to many modern communication and sensing systems in realizing many important functions that cannot be replaced by reciprocal devices. Traditional non-reciprocal devices such as circulators and isolators use ferrite materials with external magnetic field bias to realize non-reciprocal properties [1,2]. However, the preparation technology of ferrite material is not compatible with the traditional integrated technology.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Free Isolators Based on Time-Varying Transmission Lines

Zheng

Fang

et al. 2019

Electronics

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Two magnetic-free reconfigurable isolators based on a doubly balanced gyrator (DBG) are designed in this paper. One of the isolators is a single-ended transmission isolator (STI), which uses two matching resistors to absorb the signal transmitted in the reverse direction. In theory, it has infinite isolation bandwidth, which is verified by simulation and an experiment. The other isolator is a differential transmission isolator (DTI) to improve the anti-interference performance, which consists of four Wilkinson power splitters (combiners) and two reciprocal transmission line segments. The DTI uses two pairs of differential signals to prevent the reverse signal. Compared to the STI, the DTI has higher power capacity. Furthermore, when the phases of the control signals acting on the switches are changed, the isolation directions of the two isolators will be changed, to obtain the reconfigurable property.

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A Low-Loss Edge-Mode Isolator With Improved Bandwidth for Cryogenic Operation

Cited by 15 publications

References 15 publications

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

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

A Low-Insertion Loss Cryogenic Edge-Mode Isolator With 18 GHz Bandwidth

Magnetic-Free Isolators Based on Time-Varying Transmission Lines

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