Title: Film Applications
1Film Applications
2Introduction
- nmµm scale superconductor
Materials
Applications
Coated conductor
SQUID
Pulsed laser deposition (PLD)
RSFQ
Filter
Voltage regulator
Fault current limiter
3Josephson effect
- The Josephson effect is the phenomenon of current
flow across two weakly coupled superconductors
Josephson Junction (JJ)
SIS
Micro-bridge
4Magnetic flux quantum
- Magnetic flux passing through a superconducting
ring
Total magnetic flux through the ring is quantized
in units of F0
F0Magnetic flux quantum
5SQUID (Superconducting Quantum Interference
Device)
- Consists of a superconducting loop with two (or
one) Josephson Junctions - Very sensitive detector of magnetic flux
6SQUID (Superconducting Quantum Interference
Device)
- Consists of a superconducting loop with two (or
one) Josephson Junctions - Very sensitive detector of magnetic flux
Applications
Magneto Cardio Graphy (MCG)
Magneto Encephalo Graphy (MEG)
Non destructive Testing (NDT)
7RSFQ (Rapid Single Flux Quantum)
- Josephson junction-based circuits
- Based on superconductivity and quantized magnetic
flux
Trapped magnet quantum
High-speed ten times faster than CMOS
JJ
Low-power nW scale
8Superconducting Filter
Superconductor
Resonators
- Low-loss
- Sharpskirt characteristics
Applications
mobile-telecommunication base stations
9Bandwidth tunable high-Tc superconducting filter
- F. Aiga , Y. Terashima, M. Yamazaki, H. Fuke, H.
Kayano, - R. Kato, T. Hashimoto
- Advanced Materials and Devices Laboratory,
Corporate Research and Development Center,
Toshiba Corporation, - 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki
212-8582, Japan - Received 17 October 2001 received in revised
form 11 January 2002 accepted 20 February 2002
101. Introduction
- Low-loss and highly selective high-Tc
superconducting (HTS) microwave filters can
enhance performance of mobile communication
systems
It is often necessary to tune the filter
characteristics (the center frequency and the
bandwidth)
- A novel tuning method (The center frequency
tuning)
Additional dielectric plate is stacked above the
microstrip line filter with an air gap
Controlling the distance between the substrate
and the dielectric plate
In this paper
- Present new development of the HTS band-pass
filter, whose center frequency and bandwidth can
be tuned independently
112. Design
- Substrate
- 0.5-mm-thick LaAlO3 (LAO)
- Composed of two different band-pass filters
122. Design
- Composed of two different band-pass filters
Center frequency1.93 GHz
3 dB bandwidth20 MHz
Attenuation of 30 dB1.0 MHz
132. Design
- Composed of two different band-pass filters
Center frequency1.93 GHz
3 dB bandwidth20 MHz
Attenuation of 30 dB1.0 MHz
142. Design
- Prepare two dielectric plates
0.5-mm-thick sapphire plates
Set them above filter 1-part and filter 2-part
Tuning can be obtained by adjusting the distances
between the dielectric plates and the substrate
153. Results and discussion
- The center frequency tuning
The sapphire plates set above both filter 1-part
and filter 2-part
Distance0.25 mm
- Simulated frequency response
The center frequency
Original 1.93 GHz
no degradation
f0 tuning 1.92 GHz
- Measured frequency response
The center frequency
Original 1.941 GHz
The center frequency tuning of 10MHz is also
obtained
163. Results and discussion
The sapphire plate was set only above the filter
2-part
Distance0.35 mm
- Simulated frequency response
The bandwidth
Original 20 MHz
no degradation
BW tuning 15 MHz
- Measured frequency response
The bandwidth
Original 20 MHz
BW tuning 15 MHz
The bandwidth tuning of 5 MHz is also obtained in
the measurement
173. Results and discussion
- The other type of bandwidth tuning
The center frequency is kept unchanged
Tuning can be obtained by adjusting two distances
independently (d1,d2)
- Measured frequency response
The bandwidth
Tuned from 20 to 15 MHz
The bandwidth tuning of 5 MHz is obtained
184. Conclusion
- Developed a novel HTS band-pass filter, whose
center frequency and bandwidth can be tuned
independently
- The tuning characteristics of the entire filter
can be controlled by adjusting the distances
between the dielectric plates and the substrate.
- A center frequency tuning of 10 MHz and a
bandwidth tuning of 5 MHz were obtained with no
degradation of the low-loss and sharp-skirt
characteristics.
- This tunable filter is expected to be useful in
the application to mobile-telecommunication base
stations