Dual-Band Superconducting Spiral Filters Including Narrow Bandstop Notches

Frederick Huang

doi:10.1109/TMTT.2009.2017812

Dual-Band Superconducting Spiral Filters Including Narrow Bandstop Notches

Frederick Huang

Electronic, Electrical and Systems Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Dual-band filters designed as bandpass filters containing bandstop notches are described. The design formulation is simplified by considering the resonators in pairs. Two microstrip superconducting spiral filters are presented with 400-MHz center frequency, 15%-16% overall bandwidth, and notches of 1% and 0.1 %, respectively. Internal dimensions of the enclosures are only 32 mm x 30 mm x 6 mm. Suitable spiral shapes and orientations enable the required wide range of coupling coefficients to be implemented, and also reduce unwanted coupling without using partitions. The remaining low level of unwanted coupling is cancelled using capacitive bridges. A qualitative understanding of spurious interactions between spirals is obtained via electromagnetic simulations.

Original language	English
Pages (from-to)	1188-1195
Number of pages	8
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	57
Issue number	5
DOIs	https://doi.org/10.1109/TMTT.2009.2017812
Publication status	Published - 1 May 2009

Keywords

dual band
quasi-elliptic
spiral
Bandstop
superconducting
filter
notch

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10.1109/TMTT.2009.2017812

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title = "Dual-Band Superconducting Spiral Filters Including Narrow Bandstop Notches",

abstract = "Dual-band filters designed as bandpass filters containing bandstop notches are described. The design formulation is simplified by considering the resonators in pairs. Two microstrip superconducting spiral filters are presented with 400-MHz center frequency, 15%-16% overall bandwidth, and notches of 1% and 0.1 %, respectively. Internal dimensions of the enclosures are only 32 mm x 30 mm x 6 mm. Suitable spiral shapes and orientations enable the required wide range of coupling coefficients to be implemented, and also reduce unwanted coupling without using partitions. The remaining low level of unwanted coupling is cancelled using capacitive bridges. A qualitative understanding of spurious interactions between spirals is obtained via electromagnetic simulations.",

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N2 - Dual-band filters designed as bandpass filters containing bandstop notches are described. The design formulation is simplified by considering the resonators in pairs. Two microstrip superconducting spiral filters are presented with 400-MHz center frequency, 15%-16% overall bandwidth, and notches of 1% and 0.1 %, respectively. Internal dimensions of the enclosures are only 32 mm x 30 mm x 6 mm. Suitable spiral shapes and orientations enable the required wide range of coupling coefficients to be implemented, and also reduce unwanted coupling without using partitions. The remaining low level of unwanted coupling is cancelled using capacitive bridges. A qualitative understanding of spurious interactions between spirals is obtained via electromagnetic simulations.

AB - Dual-band filters designed as bandpass filters containing bandstop notches are described. The design formulation is simplified by considering the resonators in pairs. Two microstrip superconducting spiral filters are presented with 400-MHz center frequency, 15%-16% overall bandwidth, and notches of 1% and 0.1 %, respectively. Internal dimensions of the enclosures are only 32 mm x 30 mm x 6 mm. Suitable spiral shapes and orientations enable the required wide range of coupling coefficients to be implemented, and also reduce unwanted coupling without using partitions. The remaining low level of unwanted coupling is cancelled using capacitive bridges. A qualitative understanding of spurious interactions between spirals is obtained via electromagnetic simulations.

KW - dual band

KW - quasi-elliptic

KW - spiral

KW - Bandstop

KW - superconducting

KW - filter

KW - notch

U2 - 10.1109/TMTT.2009.2017812

DO - 10.1109/TMTT.2009.2017812

M3 - Article

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JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

IS - 5

ER -

Dual-Band Superconducting Spiral Filters Including Narrow Bandstop Notches

Abstract

Keywords

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