A New Type of Isolator Using the Edge-Guided Mode (Letters)

Araki, Kiyomichi; Koyama, Takahiro; Naito, Yoshiyuki

doi:10.1109/tmtt.1975.1128559

Cited by 24 publications

(5 citation statements)

References 3 publications

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“…Fig. 1(a) shows a conventional symmetric edge-mode isolator circuit design commonly found in the literature [6], [7], [8], [9], [10], [13]. This design achieves good impedance matching at both ports through carefully optimized transition tapers.…”

Section: Edge-mode Isolator Analysismentioning

confidence: 99%

“…The measured S-parameters for the asymmetric isolator prototype at a temperature of 4 K are presented in Figs. 10, and 11 gives a more detailed plot for S 21 . This isolator demonstrates good input return loss (S 11 ) better than −15 dB, mostly below −20 dB across the entire 4 to 24 GHz frequency range.…”

Section: Isolator Fabrication and Measurementmentioning

confidence: 99%

“…By asymmetrically loading the guide edges, nonreciprocal behavior can be achieved. Hines's original isolator design has undergone significant development and improvement by various groups [7], [8], [9], [10]. The bandwidth performance of the edge-mode isolator has been extensively investigated by Courtois et al [7] and Forterre et al [8].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Edge-mode Isolator Analysismentioning

confidence: 99%

Section: Isolator Fabrication and Measurementmentioning

confidence: 99%

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

Zeng,

Tong,

Paine

2023

IEEE J. Microw.

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“…Using an additive process reduces the cost by avoiding material wastage and simplifies fabrication. The first-ever experimental demonstration of a half-mode isolator design was reported in [18]. However, the authors of that work neither proposed a theoretical model nor did they show the frequency tuning of the design.…”

Section: Introductionmentioning

confidence: 99%

Theory and Design of Tunable Full-Mode and Half-Mode Ferrite Waveguide Isolators

et al. 2019

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Ferrite isolators are attractive due to their excellent isolation, low loss, good linearity and high power performance. However, these devices usually operate over a single frequency band. Multiband applications are possible if the isolation bandwidth of an isolator can be tuned. This paper presents a tunable waveguide-based full-mode ferrite isolator as well as a more compact half-mode tunable isolator, both fabricated on yttrium-iron-garnet substrates. For the first time, theory and design guidelines for the center frequency, bandwidth and tuning of the ferrite isolators unidirectional magnetostatic surface wave (MSW) mode are presented. The proposed theoretical model reveals that the isolation bandwidth can exceed 100% if the magnetization-to-bias field ratio is higher than 8. While the full-mode design is fabricated using a conventional subtractive technique, the half-mode design is implemented using inkjet printing technology. The full-mode isolator provides a maximum bandwidth of 45% and a peak isolator figure of merit (IFM) of over 65 dB at 7 GHz, whereas the half-mode design has a maximum bandwidth of 59% and a peak IFM of 76.7 dB at 7.5 GHz. The tuning of the centre frequency is from 7 GHz to 10.7 GHz for the full-mode and from 4.4 GHz to 9.9 GHz for the half-mode design using magnetic field strengths up to 2500 Oe and 2400 Oe, respectively. This work demonstrates the versatility of ferrite isolators as tunable mi crowave devices for reconfigurable RF applications.

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“…Accordingly, an edge-guided mode of propagation occurs in a wide microstrip transmission line using a ferrite slab magnetised perpendicular to the ground plane. Consequently, various versions of the edgemode isolator in microstrip and stripline have been proposed and demonstrated [2][3][4][5][6][7][8]. The edge-mode isolator is inherently broadband and the bandwidth can present two octaves or more [9].…”

mentioning

confidence: 99%