7 GHz-Band Quasi-Elliptic Function Narrow-Band Superconducting Filter on Sapphire Substrate

Kayano, Hiroyuki; Shiokawa, Noritsugu; Yamazaki, Masahito; Watanabe, T.; Aiga, Fumihiko; Hashimoto, Tatsunori

doi:10.1109/mwsym.2006.249425

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…We have developed an ultra-narrowband HTS microstrip line filter with 8-pole quasi-elliptic function characteristics in the 7 GHz band on sapphire substrate. The bandwidth of this filter is 10 MHz and the fractional bandwidth is 0.14%, which is half the value we reported in [13]. To realize this ultra-narrowband filter, we have designed a higher Qu resonator to suppress radiation loss by using hairpin microstrip line structure with 2.5 times wavelength.…”

Section: Introductionmentioning

confidence: 78%

“…Fig. 1 shows the frequency characteristic of unloaded Q (Qu), Q for dielectric loss (Qd), Q for conductor loss (Qc), and Q for radiation loss (Qr) for straight microstrip line half-wavelength resonator [4,13]. The relationship of Qu, Qd, Qc, and Qr can be written as…”

Section: Introductionmentioning

confidence: 99%

“…Qc decreases at high frequency, since surface resistance of a superconductor is proportional to (frequency) 2 [5,13]. Qr decreases by a larger gradient than Qc.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band

Shiokawa

Kayano

Yamazaki

et al. 2006

2006 Asia-Pacific Microwave Conference

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We have developed an ultranarrowband high-temperature superconducting (HTS) filter with a fractional bandwidth of 0.14% in the 7 GHz band. To realize a filter with which a narrow bandwidth and low insertion loss are compatible, resonators with high unloaded Q (Qu) value are required. Hairpin microstrip resonators with 2.5 times wavelength were adopted to suppress the radiation loss and realize a high Qu value. With both the hairpin resonators and transmission zeros supplied by an 8-pole quasi-elliptic function filter construction, designed filter properties were realized. Next-generation RF applications are expected to be realized by applying these filters.Index Terms -high-temperature superconductor, quasi-elliptic function filter, radiation loss, hairpin resonator.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band

Shiokawa

Kayano

Yamazaki

et al. 2006

2006 Asia-Pacific Microwave Conference

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“…Figure 1 depicts the four distinct crystalline planes of sapphire characterized in this work. Sapphire is a material with a low loss tangent (tan δ < 10 −7 [20]), high thermal conductivity and good durability (high surface hardness and scratch resistance [21]) that can be manufactured at low cost [22] in nearly any shape and size [23]. The Wband frequency applications of sapphire include substrates in mmwave circuits (e.g.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of W-band complex permittivity in Al₂O₃

Telmer¹,

Hilario²,

Hoff³

et al. 2019

J. Phys.: Condens. Matter

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The dielectric anisotropy of Al 2 O 3 is studied here by characterizing Wband (75-110 GHz) complex permittivity of four different orientations of sapphire (Al 2 O 3 single crystals). This was done using freespace, focused beam methods. Dielectric polarizability (α D ) of these orientations is then calculated and these values are related to their complex permittivity. Based on this relationship, a framework is developed for rapid and straightforward estimation of dielectric anisotropy using a known crystal structure and a dielectric permittivity measurement performed on one orientation of the material. This framework can be applied to other materials with dielectric anisotropy (e.g. SnO 2 , LiGaO 2 ) to predict permittivity for different orientations, enabling rapid design of highfrequency systems (e.g. radomes, electromagnetic windows). These permittivity measurements were also used to determine the dominant polarization mechanisms leading to dielectric anisotropy of Al 2 O 3 in the Wband; electronic and ionic polarization orthogonal to the direction of the focused beam.

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Narrow-Band Filter for Transmitter of Radar Application

Kayano

Kawaguchi

Shiokawa

et al. 2008

2008 38th European Microwave Conference

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7 GHz-Band Quasi-Elliptic Function Narrow-Band Superconducting Filter on Sapphire Substrate

Cited by 7 publications

References 10 publications

Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band

Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band

Anisotropy of W-band complex permittivity in Al₂O₃

Narrow-Band Filter for Transmitter of Radar Application

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7 GHz-Band Quasi-Elliptic Function Narrow-Band Superconducting Filter on Sapphire Substrate

Cited by 7 publications

References 10 publications

Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band

Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band

Anisotropy of W-band complex permittivity in Al2O3

Narrow-Band Filter for Transmitter of Radar Application

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Product

Resources

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Anisotropy of W-band complex permittivity in Al₂O₃