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AssigneeThe Circle for the Promotion of Science and Engineering
InventorsKiyomichi Araki, Hitoshi Ishida, Takao Nakagawa
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In order to provide a band pass filter for high wavelength which has a wideband, small insertion loss and flat passband and obtains steep attenuation, a plurality of ring filters, in which, an input terminal of a high-frequency signal is provided to an arbitrary point on a line in a microstripline ring resonator having the line with one wavelength at electrical length, an output terminal is provided to a point positioned at a half wavelength at electrical length from the input terminal, a open stub of ¼ wavelength at electrical length (or ½ wavelength short stub) is connected to a point positioned at ¼ wavelength at electrical length from the input terminal, are connected by cascade connection with attenuation pole frequencies being different.
A ring filter, characterized in that an input terminal (2) of a high-frequency signal is directly connected to an arbitrary point on a line in a microstripline ring resonator having the line with an electrical length of one wavelength, an output terminal (3) is directly connected to a point which is positioned at a half wavelength at electrical length from the input terminal (2), one end of a stub (5) of half wavelength at electrical length is directly connected to a point (4) positioned at ¼ wavelength at electrical length from the input terminal (2), and the other end of the stub (5) is grounded.
A ring filter, characterized in that an input terminal (2) of a high-frequency signal is directly connected to an arbitrary point on a line in a microstripline ring resonator having the line with an electrical length of one wavelength, an output terminal (3) is directly connected to a point which is positioned at a half wavelength at electrical length from the input terminal (2), one end of a stub (5) of ¼ wavelength at electrical length is directly connected to a point (4) positioned at ¼ wavelength at electrical length from the input terminal (2), and the other end of the stub (5) is grounded.
A ring filter, characterized in that an input terminal (2) of a high-frequency signal is directly connected to an arbitrary point on a line in a microstripline ring resonator having the line with an electrical length of one wavelength, an output terminal (3) is directly connected to a point which is positioned at a half wavelength at electrical length from the input terminal (2), a open stub (5) of ¼ wavelength at electrical length is directly connected to a point (4) positioned at ¼ wavelength at electrical length from the input terminal (2).
Dependencies are inferred from the claim text.