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Bandpass filter

A band-pass filter and channel technology, which is applied to waveguide-type devices, impedance networks, electrical components, etc., can solve problems such as difficulty in realizing sharp-cut band-pass filters and difficulty in realizing band-pass filters.

Inactive Publication Date: 2004-12-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the case of coupled resonators, the implementation of a bandpass filter can be difficult when the center frequency of each resonator is outside this supposedly very narrow frequency band
[0011] As mentioned above, it is difficult to realize such a very narrow-band sharp-cutting bandpass filter using a planar structure circuit only based on the existing technology

Method used

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Embodiment approach 1

[0055] Figure 10 is a plan view for explaining one mode of the filter according to the first embodiment of the present invention.

[0056] As in the description based on FIG. 1 , a superconducting microstrip line was formed on an MgO substrate 2 having a thickness of about 0.43 mm and a relative permittivity of about 10. Here, a Y-based copper oxide high-temperature superconducting thin film with a thickness of about 500 nm is used as the superconductor of the microstrip line, and the line width of the strip conductor is about 0.4 mm. This superconducting thin film can be formed by a laser deposition method, a sputtering method, a simultaneous deposition method, or the like.

[0057] Figure 10 The filter shown is of the Chebyshev type comprising six resonators 32, 34, 36, 38, 40 and 42 between input / output line paths 31 and 43 formed by excitation lines. These 6 half-wavelength hairpin resonators 32, 34, 36, 38, 40 and 42 whose opening sides face the same direction are ar...

Embodiment approach 2

[0060] Figure 12 is a plan view illustrating one mode of a filter according to another embodiment of the present invention. Figure 12The filter shown is of the Chebyshev type comprising four resonators 51, 53, 55 and 57 between the input / output line paths 50 and 58 formed by the excitation lines. As the resonators, linear resonators 51, 53, 55, and 57 of one wavelength are used. Therefore, the wavelength corresponding to the resonant frequency is equal to the length of each resonator. In addition, the resonators 51, 53, 55 and 57 adjacent to each other are respectively bent as Figure 8 Wire vias 52, 54 and 56 of this shape are shown coupled. The length of each transmission line path 52, 54 and 56 is 7 / 4 wavelength, the length x of each coupled section is determined substantially as 1 / 4 wavelength, and this coupled section is arranged closest to the corresponding resonator. As mentioned above, since the length of each resonator is determined as one wavelength, the edges ...

Embodiment approach 3

[0064] Figure 14 is a plan view illustrating one mode of a filter according to still another embodiment of the present invention.

[0065] exist Figure 14 In the shown filter, a superconducting microstrip line via is formed on a MgO substrate (not shown) having a thickness of about 0.43 mm and a relative permittivity of 10. Here, a Y-based copper oxide high-temperature superconducting thin film with a thickness of about 500 nm is used as the superconductor of the microstrip line, and the line width of the strip conductor is about 0.4 mm. This superconducting thin film can be formed by a laser deposition method, a sputtering method, a simultaneous deposition method, or the like.

[0066] Figure 14 The shown filter is a four-stage filter consisting of four linear resonators 61, 63, 65 and 67 provided between input / output line paths 60 and 68 formed by excitation lines. exist Figure 14 In the filter shown, a resonator of one wavelength is used for each resonator, while a...

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Abstract

A band pass filter configured by a planar structure circuit, includes resonators of distribution constant circuit type, transmission line paths coupling the resonators and excitation lines arranged at input / output sides. The transmission line path is provided with line path portions coupling the resonators or the resonator and the excitation line. The line path portion have a length which is (1+2m) / 4-fold (m: natural number) of a wavelength corresponding to a center frequency of the frequency band, and each coupling part between the resonators and the line portion has a length substantially determined as a 1 / 4 wavelength.

Description

[0001] This application is based on and claims priority from prior Japanese Patent Application No. 2003-142239 filed on May 20, 2003, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to bandpass filters, and more particularly to bandpass filters for communication devices. Background technique [0003] A bandpass filter is a component necessary to avoid signal interference and to use frequencies efficiently. In the field of communication, the performance of the filter is particularly important, because it determines the effective use of frequency as an important resource. In other words, with respect to the electromagnetic waves transmitted / received by the antenna, out-of-band signals are cut off by the receive filter or the transmit filter, thereby greatly reducing the interference of adjacent signals. To cut out-of-band signals most effectively, it is desirable to use a filter that clearly separates e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P1/205
CPCH01P1/20381
Inventor 桥本龙典相贺史彦福家浩之寺岛喜昭山崎六月加屋野博幸
Owner KK TOSHIBA
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