Tuning properties of 2 GHz superconducting microstrip-line filters

Fuke, Hiroyuki; Terashima, Yutaka; Kayano, Hiroyuki; Yamazaki, Masahito; Aiga, Fumihiko; Katoh, R.

doi:10.1109/77.919376

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…This indicates that HTS passive devices such as filters and antennas have a high potential in the mobile and satellite telecommunication systems. There are many reports on micro strip line bandpass filter (BPF) [1], [2] and HTS BPF based cryogenic receiver front-ends [3], [4]. On the other hand, the coplanar waveguide (CPW) structure is more advantageous than the micro strip line structure because HTS is coated only one side and it is easy for size reductions [5].…”

Section: Introductionmentioning

confidence: 99%

Design method of miniaturized HTS coplanar waveguide bandpass filters using cross coupling

Kanaya

Fujiyama

Oba

et al. 2003

IEEE Trans. Appl. Supercond.

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A new design method of miniaturizing HTS coplanar waveguide bandpass filters using cross coupling is presented. When the size of the filter decreases, the cross coupling between the resonators tends to appear, which causes attenuation poles. In order to control the cross-coupling section, we redesigned the meanderline interval and shape, so that we can design the frequency and number of the attenuation poles. The half-wave length resonator bandpss filter (BPF) is designed by using the 2.5-dimensional electromagnetic field simulator. 7-pole cross-coupled CPW BPF (center frequency of 2 GHz, bandwidth of 15 MHz, ripple of 0.1 dB and two attenuation poles on both sides of pass band) is packed within 6 mm 10 mm substrate. Simulated performance is in good agreement with the designed one. This BPF has the skirt steepness of 20 dB/MHz (40 dB attenuation), which is the same skirt characteristic of 11-pole Chebyshev BPF. Moreover, we tested YBCO BPF by using our present design theory at cryogenic temperature.

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Section: Introductionmentioning

confidence: 99%

Design method of miniaturized HTS coplanar waveguide bandpass filters using cross coupling

Kanaya

Fujiyama

Oba

et al. 2003

IEEE Trans. Appl. Supercond.

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“…Therefore, barium strontium titanate (BST) thin films were * Corresponding author. widely investigated for planar microwave devices such as phase shifters, tunable resonators and tunable filters [1][2][3][4]. Planar BST ferroelectric microwave devices exhibit an increased insertion loss at higher than 10 GHz due to dielectric loss of the BST thin films.…”

Section: Introductionmentioning

confidence: 99%

Microwave Properties of Mn Doped (Ba_{1 - x},Sr_x)TiO₃Thin Films for Tunable Phase Shifter

Kwak

Kim

Moon

et al. 2004

Integrated Ferroelectrics

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Ferroelectric Mn doped Ba 0.5 Sr 0.5 TiO 3 (Mn-BST) films with/without BaTiO 3 (BT) buffer layer have been grown on (001) MgO substrates by a pulsed laser deposition to investigate electrical tunability at microwave frequencies. Structural properties and surface morphologies of the films were investigated using an X-ray diffractometer and a scanning electron microscope, respectively. Microwave dielectric properties of Mn-BST thin films with BT buffer were studied for reduction of dielectric loss and improvement of electrical tunability. Distributed analog phase shifters have been designed and fabricated on Mn-BST films with/without BT buffer layer to understand microwave dielectric properties. The differential phase shift of the phase shifter fabricated on Mn-BST film was 22 • at 10 GHz with 80 V of applied dc bias voltage. In comparison, phase shifter fabricated on Mn-BST/BT multilayers exhibit 41 • of differential phase shift at the same condition. This suggests that a BT buffer layer is for microwave tunable device applications. The phase shifter fabricated on Mn-BST/BT multilayers exhibit a low insertion loss (S 21 ) of −1.1 dB, and a low return loss (S 11 ) of −14 dB with a bias voltage of 80 V.

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“…It was important to develop a filter capable of shifting the resonance frequency in a short time. Several techniques for shifting the center frequency of the superconducting bandpass filters have been proposed [17][18][19][20]; however, the most practical method is to use a tuning rod. Ohshima et al developed an automatic tuning system using dielectric rods.…”

Section: Superconducting Bandpass Filters For Wireless Communicationmentioning

confidence: 99%

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

Ohshima

2018

J. Phys.: Conf. Ser.

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Abstract. Thirty years have passed since the discovery of high-temperature superconductors (HTS), and practical applications of HTS equipment and devices are moving into full-swing. From the beginning of their discovery, the use of HTS in microwave devices has been recognized as one of their most practical applications. This is because the surface resistance of HTS is about 1/1000 of that of pure copper at 1 GHz and 77 K. From early on, researchers have recognized that high performance of microwave passive devices could be realized by utilizing the characteristics of HTS. In addition, the size of HTS microwave devices is relatively small, and they can be cooled by a small cryocooler. Furthermore, we were able to establish high-quality HTS thin-film fabrication technology essential for producing high performance microwave devices in a short period of time. In view of the above, I would like to present an overview of the past thirty years of superconducting microwave devices and fundamental studies thereof.

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Tuning properties of 2 GHz superconducting microstrip-line filters

Cited by 12 publications

References 22 publications

Design method of miniaturized HTS coplanar waveguide bandpass filters using cross coupling

Design method of miniaturized HTS coplanar waveguide bandpass filters using cross coupling

Microwave Properties of Mn Doped (Ba_{1 - x},Sr_x)TiO₃Thin Films for Tunable Phase Shifter

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

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Tuning properties of 2 GHz superconducting microstrip-line filters

Cited by 12 publications

References 22 publications

Design method of miniaturized HTS coplanar waveguide bandpass filters using cross coupling

Design method of miniaturized HTS coplanar waveguide bandpass filters using cross coupling

Microwave Properties of Mn Doped (Ba1 - x,Srx)TiO3Thin Films for Tunable Phase Shifter

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

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Microwave Properties of Mn Doped (Ba_{1 - x},Sr_x)TiO₃Thin Films for Tunable Phase Shifter